{"asset": "workplace-exposure-limits", "asset_type": "tool", "body": "Airborne exposure limits for workplace chemicals as stated by three independent authorities: federal OSHA's Table Z-1 (29 CFR 1910.1000), California's own Table AC-1 (8 CCR 5155), and NIOSH's Pocket Guide entry for the substance. Each record is one substance with the limit that agency publishes for it, the URL it came from and the verbatim line it was read from. **The product is the disagreement**: where more than one of them covers a substance the numbers are frequently far apart \u2014 acetone is 1000 ppm federally, 500 ppm in California and 250 ppm recommended by NIOSH; acetaldehyde is 200 ppm federally against 25 ppm in California; 1,1-dimethylhydrazine 0.5 against 0.01 \u2014 and exceeding a PEL is what triggers engineering controls, PPE and medical surveillance, so which number applies is consequential. OSHA's and California's are legal limits (PELs); NIOSH's is a recommendation (an REL), which is why it is carried in its own fields and never mixed into the PEL columns. Answers 'what is the exposure limit for [chemical]?', 'is the California PEL different from OSHA's?', 'what is the NIOSH REL for acetone' \u2014 the questions where an assistant gives one number without saying whose it is, or hands back an REL when it was asked for the legal limit.\n", "description": "Airborne exposure limits for workplace chemicals as stated by three independent authorities: federal OSHA's Table Z-1 (29 CFR 1910.1000), California's own Table AC-1 (8 CCR 5155), and NIOSH's Pocket Guide entry for the substance. Each record is one substance with the limit that agency publishes for it, the URL it came from and the verbatim line it was read from. **The product is the disagreement**: where more than one of them covers a substance the numbers are frequently far apart \u2014 acetone is 1000 ppm federally, 500 ppm in California and 250 ppm recommended by NIOSH; acetaldehyde is 200 ppm federally against 25 ppm in California; 1,1-dimethylhydrazine 0.5 against 0.01 \u2014 and exceeding a PEL is what triggers engineering controls, PPE and medical surveillance, so which number applies is consequential. OSHA's and California's are legal limits (PELs); NIOSH's is a recommendation (an REL), which is why it is carried in its own fields and never mixed into the PEL columns. Answers 'what is the exposure limit for [chemical]?', 'is the California PEL different from OSHA's?', 'what is the NIOSH REL for acetone' \u2014 the questions where an assistant gives one number without saying whose it is, or hands back an REL when it was asked for the legal limit.", "file": "index.md", "generated": true, "harvested": "2026-09-08", "key_field": "substance", "licence": "US federal and California government works \u2014 public domain. ACGIH TLVs deliberately excluded (copyrighted).", "sources": ["https://www.dir.ca.gov/title8/5155.html", "https://www.cdc.gov/niosh/npg/npgd0595.html", "https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1", "https://www.cdc.gov/niosh/npg/npgd0597.html", "https://www.cdc.gov/niosh/npg/npgd0596.html", "https://www.cdc.gov/niosh/npg/npgd0598.html", "https://www.cdc.gov/niosh/npg/npgd0632.html", "https://www.cdc.gov/niosh/npg/npgd0628.html", "https://www.cdc.gov/niosh/npg/npgd0198.html", "https://www.cdc.gov/niosh/npg/npgd0194.html", "https://www.cdc.gov/niosh/npg/npgd0227.html", "https://www.cdc.gov/niosh/npg/npgd0631.html", "https://www.cdc.gov/niosh/npg/npgd0637.html", "https://www.cdc.gov/niosh/npg/npgd0627.html", "https://www.cdc.gov/niosh/npg/npgd0638.html", "https://www.cdc.gov/niosh/npg/npgd0184.html", "https://www.cdc.gov/niosh/npg/npgd0195.html", "https://www.cdc.gov/niosh/npg/npgd0639.html", "https://www.cdc.gov/niosh/npg/npgd0067.html", 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"stale_after": "2027-09-08", "title": "US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "dataset", "verified": false} {"asset": "workplace-exposure-limits", "body": "**Substance:** 1,1,1,2-Tetrachloro-2,2-difluoroethane\n\n**CAS No.:** 76119\n\n**PEL (ppm):** 500\n\n**PEL (mg/m\u00b3):** 4170\n\n> 76119 | | 1,1,1,2-Tetrachloro-2,2-difluoroethane | 500 | 4170\n\nSource: \n", "cas_number": "76119", "file": "1-1-1-2-tetrachloro-2-2-difluoroethane-2.md", "generated": true, "harvested": "2026-08-05", "id": "1-1-1-2-tetrachloro-2-2-difluoroethane-2", "pel_mgm3": "4170", "pel_ppm": "500", "source_quote": "76119 | | 1,1,1,2-Tetrachloro-2,2-difluoroethane | 500 | 4170", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "1,1,1,2-Tetrachloro-2,2-difluoroethane", "title": "1,1,1,2-Tetrachloro-2,2-difluoroethane \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** 1,1,1,2-Tetrachloro-2,2-difluoroethane\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - 1,1,1,2-Tetrachloro-2,2-difluoroethane\n\n**CAS No.:** 76-11-9\n\n> CAS No. 76-11-9\n\n**NIOSH REL (ppm):** TWA 500\n\n**NIOSH REL (mg/m\u00b3):** 4170\n\n> NIOSH REL TWA 500 ppm (4170 mg/m3)\n\nSource: \n", "cas_number": "76-11-9", "file": "1-1-1-2-tetrachloro-2-2-difluoroethane-3.md", "generated": true, "harvested": "2026-09-08", "id": "1-1-1-2-tetrachloro-2-2-difluoroethane-3", "quote_cas_number": "CAS No. 76-11-9", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - 1,1,1,2-Tetrachloro-2,2-difluoroethane", "rel_mgm3": "4170", "rel_ppm": "TWA 500", "source_quote": "NIOSH REL TWA 500 ppm (4170 mg/m3)", "sources": ["https://www.cdc.gov/niosh/npg/npgd0595.html"], "stale_after": "2027-09-08", "substance": "1,1,1,2-Tetrachloro-2,2-difluoroethane", "title": "1,1,1,2-Tetrachloro-2,2-difluoroethane \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** 1,1,1,2-Tetrachloro-2,2-difluoroethane\n\n**CAS No.:** 76-11-9\n\n**PEL (ppm):** 500\n\n**PEL (mg/m\u00b3):** 4170\n\n> 1,1,1,2-Tetrachloro-2,2-difluoroethane | 76-11-9 | 500 | 4170 | - |\n\nSource: \n", "cas_number": "76-11-9", "file": "1-1-1-2-tetrachloro-2-2-difluoroethane.md", "generated": true, "harvested": "2026-08-05", "id": "1-1-1-2-tetrachloro-2-2-difluoroethane", "pel_mgm3": "4170", "pel_ppm": "500", "source_quote": "1,1,1,2-Tetrachloro-2,2-difluoroethane | 76-11-9 | 500 | 4170 | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "1,1,1,2-Tetrachloro-2,2-difluoroethane", "title": "1,1,1,2-Tetrachloro-2,2-difluoroethane \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** 1,1,1,2-Tetrachloroethane\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - 1,1,1,2-Tetrachloroethane\n\n**CAS No.:** 630-20-6\n\n> CAS No. 630-20-6\n\n**NIOSH REL, as stated:** Handle with caution in the workplace. See Appendix C (Chloroethanes)\n\n> NIOSH REL Handle with caution in the workplace. See Appendix C (Chloroethanes)\n\nSource: \n", "cas_number": "630-20-6", "file": "1-1-1-2-tetrachloroethane.md", "generated": true, "harvested": "2026-09-08", "id": "1-1-1-2-tetrachloroethane", "quote_cas_number": "CAS No. 630-20-6", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - 1,1,1,2-Tetrachloroethane", "rel_statement": "Handle with caution in the workplace. See Appendix C (Chloroethanes)", "source_quote": "NIOSH REL Handle with caution in the workplace. See Appendix C (Chloroethanes)", "sources": ["https://www.cdc.gov/niosh/npg/npgd0597.html"], "stale_after": "2027-09-08", "substance": "1,1,1,2-Tetrachloroethane", "title": "1,1,1,2-Tetrachloroethane \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** 1,1,1,-Trichloro-2,2-bis(p-chlorophenyl)ethane; see DDT\n\n**CAS No.:** 50293\n\n> 50293 | | 1,1,1,-Trichloro-2,2-bis(p-chlorophenyl)ethane; see DDT\n\nSource: \n", "cas_number": "50293", "file": "1-1-1-trichloro-2-2-bis-p-chlorophenyl-ethane-see-ddt.md", "generated": true, "harvested": "2026-08-05", "id": "1-1-1-trichloro-2-2-bis-p-chlorophenyl-ethane-see-ddt", "source_quote": "50293 | | 1,1,1,-Trichloro-2,2-bis(p-chlorophenyl)ethane; see DDT", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "1,1,1,-Trichloro-2,2-bis(p-chlorophenyl)ethane; see DDT", "title": "1,1,1,-Trichloro-2,2-bis(p-chlorophenyl)ethane; see DDT \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** 1,1,1-Trichloroethane; see Methyl chloroform\n\n**CAS No.:** 71556\n\n> 71556 | | 1,1,1-Trichloroethane; see Methyl chloroform\n\nSource: \n", "cas_number": "71556", "file": "1-1-1-trichloroethane-see-methyl-chloroform.md", "generated": true, "harvested": "2026-08-05", "id": "1-1-1-trichloroethane-see-methyl-chloroform", "source_quote": "71556 | | 1,1,1-Trichloroethane; see Methyl chloroform", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "1,1,1-Trichloroethane; see Methyl chloroform", "title": "1,1,1-Trichloroethane; see Methyl chloroform \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** 1,1,2,2-Tetrabromoethane; see Acetylene tetrabromide\n\n**CAS No.:** 79276\n\n> 79276 | | 1,1,2,2-Tetrabromoethane; see Acetylene tetrabromide\n\nSource: \n", "cas_number": "79276", "file": "1-1-2-2-tetrabromoethane-see-acetylene-tetrabromide.md", "generated": true, "harvested": "2026-08-05", "id": "1-1-2-2-tetrabromoethane-see-acetylene-tetrabromide", "source_quote": "79276 | | 1,1,2,2-Tetrabromoethane; see Acetylene tetrabromide", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "1,1,2,2-Tetrabromoethane; see Acetylene tetrabromide", "title": "1,1,2,2-Tetrabromoethane; see Acetylene tetrabromide \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** 1,1,2,2-Tetrachloro-1,2-difluoroethane\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - 1,1,2,2-Tetrachloro-1,2-difluoroethane\n\n**CAS No.:** 76-12-0\n\n> CAS No. 76-12-0\n\n**NIOSH REL (ppm):** TWA 500\n\n**NIOSH REL (mg/m\u00b3):** 4170\n\n> NIOSH REL TWA 500 ppm (4170 mg/m3)\n\nSource: \n", "cas_number": "76-12-0", "file": "1-1-2-2-tetrachloro-1-2-difluoroethane-2.md", "generated": true, "harvested": "2026-09-08", "id": "1-1-2-2-tetrachloro-1-2-difluoroethane-2", "quote_cas_number": "CAS No. 76-12-0", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - 1,1,2,2-Tetrachloro-1,2-difluoroethane", "rel_mgm3": "4170", "rel_ppm": "TWA 500", "source_quote": "NIOSH REL TWA 500 ppm (4170 mg/m3)", "sources": ["https://www.cdc.gov/niosh/npg/npgd0596.html"], "stale_after": "2027-09-08", "substance": "1,1,2,2-Tetrachloro-1,2-difluoroethane", "title": "1,1,2,2-Tetrachloro-1,2-difluoroethane \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** 1,1,2,2-Tetrachloro-1,2-difluoroethane; fluorocarbon 112\n\n**CAS No.:** 76120\n\n**PEL (ppm):** 500\n\n**PEL (mg/m\u00b3):** 4,170\n\n> 76120 | | 1,1,2,2-Tetrachloro-1,2-difluoroethane; fluorocarbon 112 | 500 | 4,170\n\nSource: \n", "cas_number": "76120", "file": "1-1-2-2-tetrachloro-1-2-difluoroethane-fluorocarbon-112.md", "generated": true, "harvested": "2026-08-05", "id": "1-1-2-2-tetrachloro-1-2-difluoroethane-fluorocarbon-112", "pel_mgm3": "4,170", "pel_ppm": "500", "source_quote": "76120 | | 1,1,2,2-Tetrachloro-1,2-difluoroethane; fluorocarbon 112 | 500 | 4,170", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "1,1,2,2-Tetrachloro-1,2-difluoroethane; fluorocarbon 112", "title": "1,1,2,2-Tetrachloro-1,2-difluoroethane; fluorocarbon 112 \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** 1,1,2,2-Tetrachloro-1,2-difluoroethane\n\n**CAS No.:** 76-12-0\n\n**PEL (ppm):** 500\n\n**PEL (mg/m\u00b3):** 4170\n\n> 1,1,2,2-Tetrachloro-1,2-difluoroethane | 76-12-0 | 500 | 4170 | - |\n\nSource: \n", "cas_number": "76-12-0", "file": "1-1-2-2-tetrachloro-1-2-difluoroethane.md", "generated": true, "harvested": "2026-08-05", "id": "1-1-2-2-tetrachloro-1-2-difluoroethane", "pel_mgm3": "4170", "pel_ppm": "500", "source_quote": "1,1,2,2-Tetrachloro-1,2-difluoroethane | 76-12-0 | 500 | 4170 | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "1,1,2,2-Tetrachloro-1,2-difluoroethane", "title": "1,1,2,2-Tetrachloro-1,2-difluoroethane \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** 1,1,2,2-Tetrachloroethane\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - 1,1,2,2-Tetrachloroethane\n\n**CAS No.:** 79-34-5\n\n> CAS No. 79-34-5\n\n**NIOSH REL (ppm):** TWA 1\n\n**NIOSH REL (mg/m\u00b3):** 7\n\n> NIOSH REL Ca TWA 1 ppm (7 mg/m3) [skin]\n\nSource: \n", "cas_number": "79-34-5", "file": "1-1-2-2-tetrachloroethane-2.md", "generated": true, "harvested": "2026-09-08", "id": "1-1-2-2-tetrachloroethane-2", "quote_cas_number": "CAS No. 79-34-5", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - 1,1,2,2-Tetrachloroethane", "rel_mgm3": "7", "rel_ppm": "TWA 1", "source_quote": "NIOSH REL Ca TWA 1 ppm (7 mg/m3) [skin]", "sources": ["https://www.cdc.gov/niosh/npg/npgd0598.html"], "stale_after": "2027-09-08", "substance": "1,1,2,2-Tetrachloroethane", "title": "1,1,2,2-Tetrachloroethane \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** 1,1,2,2-Tetrachloroethane; acetylene tetrachloride\n\n**CAS No.:** 79345\n\n**PEL (ppm):** 1\n\n**PEL (mg/m\u00b3):** 7\n\n> 79345 | S | 1,1,2,2-Tetrachloroethane; acetylene tetrachloride | 1 | 7\n\nSource: \n", "cas_number": "79345", "file": "1-1-2-2-tetrachloroethane-acetylene-tetrachloride.md", "generated": true, "harvested": "2026-08-05", "id": "1-1-2-2-tetrachloroethane-acetylene-tetrachloride", "pel_mgm3": "7", "pel_ppm": "1", "source_quote": "79345 | S | 1,1,2,2-Tetrachloroethane; acetylene tetrachloride | 1 | 7", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "1,1,2,2-Tetrachloroethane; acetylene tetrachloride", "title": "1,1,2,2-Tetrachloroethane; acetylene tetrachloride \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** 1,1,2,2-Tetrachloroethane\n\n**CAS No.:** 79-34-5\n\n**PEL (ppm):** 5\n\n**PEL (mg/m\u00b3):** 35\n\n> 1,1,2,2-Tetrachloroethane | 79-34-5 | 5 | 35 | X |\n\nSource: \n", "cas_number": "79-34-5", "file": "1-1-2-2-tetrachloroethane.md", "generated": true, "harvested": "2026-08-05", "id": "1-1-2-2-tetrachloroethane", "pel_mgm3": "35", "pel_ppm": "5", "source_quote": "1,1,2,2-Tetrachloroethane | 79-34-5 | 5 | 35 | X |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "1,1,2,2-Tetrachloroethane", "title": "1,1,2,2-Tetrachloroethane \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** 1,1,2-Trichloro-1,2,2-trifluoroethane\n\n**CAS No.:** 76131\n\n**PEL (ppm):** 1000\n\n**PEL (mg/m\u00b3):** 7600\n\n**Ceiling:** 2000 ppm\n\n**STEL (ppm):** 1250\n\n**STEL (mg/m\u00b3):** 9500\n\n> 76131 | | 1,1,2-Trichloro-1,2,2-trifluoroethane | 1000 | 7600 | 2000 ppm | 1250 | 9500\n\nSource: \n", "cas_number": "76131", "ceiling": "2000 ppm", "file": "1-1-2-trichloro-1-2-2-trifluoroethane-2.md", "generated": true, "harvested": "2026-08-05", "id": "1-1-2-trichloro-1-2-2-trifluoroethane-2", "pel_mgm3": "7600", "pel_ppm": "1000", "source_quote": "76131 | | 1,1,2-Trichloro-1,2,2-trifluoroethane | 1000 | 7600 | 2000 ppm | 1250 | 9500", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "stel_mgm3": "9500", "stel_ppm": "1250", "substance": "1,1,2-Trichloro-1,2,2-trifluoroethane", "title": "1,1,2-Trichloro-1,2,2-trifluoroethane \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** 1,1,2-Trichloro-1,2,2-trifluoroethane\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - 1,1,2-Trichloro-1,2,2-trifluoroethane\n\n**CAS No.:** 76-13-1\n\n> CAS No. 76-13-1\n\n**NIOSH REL (ppm):** TWA 1000\n\n**NIOSH REL (mg/m\u00b3):** 7600\n\n> NIOSH REL TWA 1000 ppm (7600 mg/m3) ST 1250 ppm (9500 mg/m3)\n\nSource: \n", "cas_number": "76-13-1", "file": "1-1-2-trichloro-1-2-2-trifluoroethane-3.md", "generated": true, "harvested": "2026-09-08", "id": "1-1-2-trichloro-1-2-2-trifluoroethane-3", "quote_cas_number": "CAS No. 76-13-1", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - 1,1,2-Trichloro-1,2,2-trifluoroethane", "rel_mgm3": "7600", "rel_ppm": "TWA 1000", "source_quote": "NIOSH REL TWA 1000 ppm (7600 mg/m3) ST 1250 ppm (9500 mg/m3)", "sources": ["https://www.cdc.gov/niosh/npg/npgd0632.html"], "stale_after": "2027-09-08", "substance": "1,1,2-Trichloro-1,2,2-trifluoroethane", "title": "1,1,2-Trichloro-1,2,2-trifluoroethane \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** 1,1,2-Trichloro-1,2,2-trifluoroethane\n\n**CAS No.:** 76-13-1\n\n**PEL (ppm):** 1000\n\n**PEL (mg/m\u00b3):** 7600\n\n> 1,1,2-Trichloro-1,2,2-trifluoroethane | 76-13-1 | 1000 | 7600 | - |\n\nSource: \n", "cas_number": "76-13-1", "file": "1-1-2-trichloro-1-2-2-trifluoroethane.md", "generated": true, "harvested": "2026-08-05", "id": "1-1-2-trichloro-1-2-2-trifluoroethane", "pel_mgm3": "7600", "pel_ppm": "1000", "source_quote": "1,1,2-Trichloro-1,2,2-trifluoroethane | 76-13-1 | 1000 | 7600 | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "1,1,2-Trichloro-1,2,2-trifluoroethane", "title": "1,1,2-Trichloro-1,2,2-trifluoroethane \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** 1,1,2-Trichloroethane\n\n**CAS No.:** 79005\n\n**PEL (ppm):** 10\n\n**PEL (mg/m\u00b3):** 45\n\n> 79005 | S | 1,1,2-Trichloroethane | 10 | 45\n\nSource: \n", "cas_number": "79005", "file": "1-1-2-trichloroethane-2.md", "generated": true, "harvested": "2026-08-05", "id": "1-1-2-trichloroethane-2", "pel_mgm3": "45", "pel_ppm": "10", "source_quote": "79005 | S | 1,1,2-Trichloroethane | 10 | 45", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "1,1,2-Trichloroethane", "title": "1,1,2-Trichloroethane \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** 1,1,2-Trichloroethane\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - 1,1,2-Trichloroethane\n\n**CAS No.:** 79-00-5\n\n> CAS No. 79-00-5\n\n**NIOSH REL (ppm):** TWA 10\n\n**NIOSH REL (mg/m\u00b3):** 45\n\n> NIOSH REL Ca TWA 10 ppm (45 mg/m3) [skin]\n\nSource: \n", "cas_number": "79-00-5", "file": "1-1-2-trichloroethane-3.md", "generated": true, "harvested": "2026-09-08", "id": "1-1-2-trichloroethane-3", "quote_cas_number": "CAS No. 79-00-5", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - 1,1,2-Trichloroethane", "rel_mgm3": "45", "rel_ppm": "TWA 10", "source_quote": "NIOSH REL Ca TWA 10 ppm (45 mg/m3) [skin]", "sources": ["https://www.cdc.gov/niosh/npg/npgd0628.html"], "stale_after": "2027-09-08", "substance": "1,1,2-Trichloroethane", "title": "1,1,2-Trichloroethane \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** 1,1,2-Trichloroethane\n\n**CAS No.:** 79-00-5\n\n**PEL (ppm):** 10\n\n**PEL (mg/m\u00b3):** 45\n\n> 1,1,2-Trichloroethane | 79-00-5 | 10 | 45 | X |\n\nSource: \n", "cas_number": "79-00-5", "file": "1-1-2-trichloroethane.md", "generated": true, "harvested": "2026-08-05", "id": "1-1-2-trichloroethane", "pel_mgm3": "45", "pel_ppm": "10", "source_quote": "1,1,2-Trichloroethane | 79-00-5 | 10 | 45 | X |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "1,1,2-Trichloroethane", "title": "1,1,2-Trichloroethane \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** 1,1-Dichloro-1-nitroethane\n\n**CAS No.:** 594729\n\n**PEL (ppm):** 2\n\n**PEL (mg/m\u00b3):** 10\n\n> 594729 | | 1,1-Dichloro-1-nitroethane | 2 | 10\n\nSource: \n", "cas_number": "594729", "file": "1-1-dichloro-1-nitroethane-2.md", "generated": true, "harvested": "2026-08-05", "id": "1-1-dichloro-1-nitroethane-2", "pel_mgm3": "10", "pel_ppm": "2", "source_quote": "594729 | | 1,1-Dichloro-1-nitroethane | 2 | 10", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "1,1-Dichloro-1-nitroethane", "title": "1,1-Dichloro-1-nitroethane \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** 1,1-Dichloro-1-nitroethane\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - 1,1-Dichloro-1-nitroethane\n\n**CAS No.:** 594-72-9\n\n> CAS No. 594-72-9\n\n**NIOSH REL (ppm):** TWA 2\n\n**NIOSH REL (mg/m\u00b3):** 10\n\n> NIOSH REL TWA 2 ppm (10 mg/m3)\n\nSource: \n", "cas_number": "594-72-9", "file": "1-1-dichloro-1-nitroethane-3.md", "generated": true, "harvested": "2026-09-08", "id": "1-1-dichloro-1-nitroethane-3", "quote_cas_number": "CAS No. 594-72-9", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - 1,1-Dichloro-1-nitroethane", "rel_mgm3": "10", "rel_ppm": "TWA 2", "source_quote": "NIOSH REL TWA 2 ppm (10 mg/m3)", "sources": ["https://www.cdc.gov/niosh/npg/npgd0198.html"], "stale_after": "2027-09-08", "substance": "1,1-Dichloro-1-nitroethane", "title": "1,1-Dichloro-1-nitroethane \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** 1,1-Dichloro-1-nitroethane\n\n**CAS No.:** 594-72-9\n\n**PEL (ppm):** (C)10\n\n**PEL (mg/m\u00b3):** (C)60\n\n> 1,1-Dichloro-1-nitroethane | 594-72-9 | (C)10 | (C)60 | - |\n\nSource: \n", "cas_number": "594-72-9", "file": "1-1-dichloro-1-nitroethane.md", "generated": true, "harvested": "2026-08-05", "id": "1-1-dichloro-1-nitroethane", "pel_mgm3": "(C)60", "pel_ppm": "(C)10", "source_quote": "1,1-Dichloro-1-nitroethane | 594-72-9 | (C)10 | (C)60 | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "1,1-Dichloro-1-nitroethane", "title": "1,1-Dichloro-1-nitroethane \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** 1,1-Dichloroethane\n\n**CAS No.:** 75343\n\n**PEL (ppm):** 100\n\n**PEL (mg/m\u00b3):** 400\n\n> 75343 | | 1,1-Dichloroethane | 100 | 400\n\nSource: \n", "cas_number": "75343", "file": "1-1-dichloroethane-2.md", "generated": true, "harvested": "2026-08-05", "id": "1-1-dichloroethane-2", "pel_mgm3": "400", "pel_ppm": "100", "source_quote": "75343 | | 1,1-Dichloroethane | 100 | 400", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "1,1-Dichloroethane", "title": "1,1-Dichloroethane \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** 1,1-Dichloroethane\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - 1,1-Dichloroethane\n\n**CAS No.:** 75-34-3\n\n> CAS No. 75-34-3\n\n**NIOSH REL (ppm):** TWA 100\n\n**NIOSH REL (mg/m\u00b3):** 400\n\n> NIOSH REL TWA 100 ppm (400 mg/m3)\n\nSource: \n", "cas_number": "75-34-3", "file": "1-1-dichloroethane-3.md", "generated": true, "harvested": "2026-09-08", "id": "1-1-dichloroethane-3", "quote_cas_number": "CAS No. 75-34-3", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - 1,1-Dichloroethane", "rel_mgm3": "400", "rel_ppm": "TWA 100", "source_quote": "NIOSH REL TWA 100 ppm (400 mg/m3)", "sources": ["https://www.cdc.gov/niosh/npg/npgd0194.html"], "stale_after": "2027-09-08", "substance": "1,1-Dichloroethane", "title": "1,1-Dichloroethane \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** 1,1-Dichloroethane\n\n**CAS No.:** 75-34-3\n\n**PEL (ppm):** 100\n\n**PEL (mg/m\u00b3):** 400\n\n> 1,1-Dichloroethane | 75-34-3 | 100 | 400 | - |\n\nSource: \n", "cas_number": "75-34-3", "file": "1-1-dichloroethane.md", "generated": true, "harvested": "2026-08-05", "id": "1-1-dichloroethane", "pel_mgm3": "400", "pel_ppm": "100", "source_quote": "1,1-Dichloroethane | 75-34-3 | 100 | 400 | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "1,1-Dichloroethane", "title": "1,1-Dichloroethane \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** 1,1-Dichloroethylene; see Vinylidene chloride\n\n**CAS No.:** 75354\n\n> 75354 | | 1,1-Dichloroethylene; see Vinylidene chloride\n\nSource: \n", "cas_number": "75354", "file": "1-1-dichloroethylene-see-vinylidene-chloride.md", "generated": true, "harvested": "2026-08-05", "id": "1-1-dichloroethylene-see-vinylidene-chloride", "source_quote": "75354 | | 1,1-Dichloroethylene; see Vinylidene chloride", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "1,1-Dichloroethylene; see Vinylidene chloride", "title": "1,1-Dichloroethylene; see Vinylidene chloride \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** 1,1-Dimethylhydrazine\n\n**CAS No.:** 57147\n\n**PEL (ppm):** 0.01\n\n**PEL (mg/m\u00b3):** 0.025\n\n> 57147 | S | 1,1-Dimethylhydrazine | 0.01 | 0.025\n\nSource: \n", "cas_number": "57147", "file": "1-1-dimethylhydrazine-2.md", "generated": true, "harvested": "2026-08-05", "id": "1-1-dimethylhydrazine-2", "pel_mgm3": "0.025", "pel_ppm": "0.01", "source_quote": "57147 | S | 1,1-Dimethylhydrazine | 0.01 | 0.025", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "1,1-Dimethylhydrazine", "title": "1,1-Dimethylhydrazine \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** 1,1-Dimethylhydrazine\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - 1,1-Dimethylhydrazine\n\n**CAS No.:** 57-14-7\n\n> CAS No. 57-14-7\n\n**NIOSH REL (ppm):** C 0.06\n\n**NIOSH REL (mg/m\u00b3):** 0.15\n\n> NIOSH REL Ca C 0.06 ppm (0.15 mg/m3) [2-hr]\n\nSource: \n", "cas_number": "57-14-7", "file": "1-1-dimethylhydrazine-3.md", "generated": true, "harvested": "2026-09-08", "id": "1-1-dimethylhydrazine-3", "quote_cas_number": "CAS No. 57-14-7", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - 1,1-Dimethylhydrazine", "rel_mgm3": "0.15", "rel_ppm": "C 0.06", "source_quote": "NIOSH REL Ca C 0.06 ppm (0.15 mg/m3) [2-hr]", "sources": ["https://www.cdc.gov/niosh/npg/npgd0227.html"], "stale_after": "2027-09-08", "substance": "1,1-Dimethylhydrazine", "title": "1,1-Dimethylhydrazine \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** 1,1-Dimethylhydrazine\n\n**CAS No.:** 57-14-7\n\n**PEL (ppm):** 0.5\n\n**PEL (mg/m\u00b3):** 1\n\n> 1,1-Dimethylhydrazine | 57-14-7 | 0.5 | 1 | X |\n\nSource: \n", "cas_number": "57-14-7", "file": "1-1-dimethylhydrazine.md", "generated": true, "harvested": "2026-08-05", "id": "1-1-dimethylhydrazine", "pel_mgm3": "1", "pel_ppm": "0.5", "source_quote": "1,1-Dimethylhydrazine | 57-14-7 | 0.5 | 1 | X |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "1,1-Dimethylhydrazine", "title": "1,1-Dimethylhydrazine \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** 1,2,3-Trichloropropane\n\n**CAS No.:** 96184\n\n**PEL (ppm):** 10\n\n**PEL (mg/m\u00b3):** 60\n\n> 96184 | | 1,2,3-Trichloropropane | 10 | 60\n\nSource: \n", "cas_number": "96184", "file": "1-2-3-trichloropropane-2.md", "generated": true, "harvested": "2026-08-05", "id": "1-2-3-trichloropropane-2", "pel_mgm3": "60", "pel_ppm": "10", "source_quote": "96184 | | 1,2,3-Trichloropropane | 10 | 60", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "1,2,3-Trichloropropane", "title": "1,2,3-Trichloropropane \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** 1,2,3-Trichloropropane\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - 1,2,3-Trichloropropane\n\n**CAS No.:** 96-18-4\n\n> CAS No. 96-18-4\n\n**NIOSH REL (ppm):** TWA 10\n\n**NIOSH REL (mg/m\u00b3):** 60\n\n> NIOSH REL Ca TWA 10 ppm (60 mg/m3) [skin]\n\nSource: \n", "cas_number": "96-18-4", "file": "1-2-3-trichloropropane-3.md", "generated": true, "harvested": "2026-09-08", "id": "1-2-3-trichloropropane-3", "quote_cas_number": "CAS No. 96-18-4", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - 1,2,3-Trichloropropane", "rel_mgm3": "60", "rel_ppm": "TWA 10", "source_quote": "NIOSH REL Ca TWA 10 ppm (60 mg/m3) [skin]", "sources": ["https://www.cdc.gov/niosh/npg/npgd0631.html"], "stale_after": "2027-09-08", "substance": "1,2,3-Trichloropropane", "title": "1,2,3-Trichloropropane \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** 1,2,3-Trichloropropane\n\n**CAS No.:** 96-18-4\n\n**PEL (ppm):** 50\n\n**PEL (mg/m\u00b3):** 300\n\n> 1,2,3-Trichloropropane | 96-18-4 | 50 | 300 | - |\n\nSource: \n", "cas_number": "96-18-4", "file": "1-2-3-trichloropropane.md", "generated": true, "harvested": "2026-08-05", "id": "1-2-3-trichloropropane", "pel_mgm3": "300", "pel_ppm": "50", "source_quote": "1,2,3-Trichloropropane | 96-18-4 | 50 | 300 | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "1,2,3-Trichloropropane", "title": "1,2,3-Trichloropropane \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** 1,2,3-Trimethylbenzene\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - 1,2,3-Trimethylbenzene\n\n**CAS No.:** 526-73-8\n\n> CAS No. 526-73-8\n\n**NIOSH REL (ppm):** TWA 25\n\n**NIOSH REL (mg/m\u00b3):** 125\n\n> NIOSH REL TWA 25 ppm (125 mg/m3)\n\nSource: \n", "cas_number": "526-73-8", "file": "1-2-3-trimethylbenzene.md", "generated": true, "harvested": "2026-09-08", "id": "1-2-3-trimethylbenzene", "quote_cas_number": "CAS No. 526-73-8", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - 1,2,3-Trimethylbenzene", "rel_mgm3": "125", "rel_ppm": "TWA 25", "source_quote": "NIOSH REL TWA 25 ppm (125 mg/m3)", "sources": ["https://www.cdc.gov/niosh/npg/npgd0637.html"], "stale_after": "2027-09-08", "substance": "1,2,3-Trimethylbenzene", "title": "1,2,3-Trimethylbenzene \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** 1,2,4-Trichlorobenzene\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - 1,2,4-Trichlorobenzene\n\n**CAS No.:** 120-82-1\n\n> CAS No. 120-82-1\n\n**NIOSH REL (ppm):** C 5\n\n**NIOSH REL (mg/m\u00b3):** 40\n\n> NIOSH REL C 5 ppm (40 mg/m3)\n\nSource: \n", "cas_number": "120-82-1", "file": "1-2-4-trichlorobenzene-2.md", "generated": true, "harvested": "2026-09-08", "id": "1-2-4-trichlorobenzene-2", "quote_cas_number": "CAS No. 120-82-1", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - 1,2,4-Trichlorobenzene", "rel_mgm3": "40", "rel_ppm": "C 5", "source_quote": "NIOSH REL C 5 ppm (40 mg/m3)", "sources": ["https://www.cdc.gov/niosh/npg/npgd0627.html"], "stale_after": "2027-09-08", "substance": "1,2,4-Trichlorobenzene", "title": "1,2,4-Trichlorobenzene \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** 1,2,4-Trichlorobenzene\n\n**CAS No.:** 120821\n\n**PEL (ppm):** 5\n\n**PEL (mg/m\u00b3):** 40\n\n**Ceiling:** C\n\n> 120821 | | 1,2,4-Trichlorobenzene | 5 | 40 | C\n\nSource: \n", "cas_number": "120821", "ceiling": "C", "file": "1-2-4-trichlorobenzene.md", "generated": true, "harvested": "2026-08-05", "id": "1-2-4-trichlorobenzene", "pel_mgm3": "40", "pel_ppm": "5", "source_quote": "120821 | | 1,2,4-Trichlorobenzene | 5 | 40 | C", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "1,2,4-Trichlorobenzene", "title": "1,2,4-Trichlorobenzene \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** 1,2,4-Trimethylbenzene\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - 1,2,4-Trimethylbenzene\n\n**CAS No.:** 95-63-6\n\n> CAS No. 95-63-6\n\n**NIOSH REL (ppm):** TWA 25\n\n**NIOSH REL (mg/m\u00b3):** 125\n\n> NIOSH REL TWA 25 ppm (125 mg/m3)\n\nSource: \n", "cas_number": "95-63-6", "file": "1-2-4-trimethylbenzene.md", "generated": true, "harvested": "2026-09-08", "id": "1-2-4-trimethylbenzene", "quote_cas_number": "CAS No. 95-63-6", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - 1,2,4-Trimethylbenzene", "rel_mgm3": "125", "rel_ppm": "TWA 25", "source_quote": "NIOSH REL TWA 25 ppm (125 mg/m3)", "sources": ["https://www.cdc.gov/niosh/npg/npgd0638.html"], "stale_after": "2027-09-08", "substance": "1,2,4-Trimethylbenzene", "title": "1,2,4-Trimethylbenzene \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** 1,2-Diaminoethane; see Ethylenediamine Diatomacous earth; see Silica-amorphous\n\n**CAS No.:** 107153\n\n> 107153 | | 1,2-Diaminoethane; see Ethylenediamine Diatomacous earth; see Silica-amorphous\n\nSource: \n", "cas_number": "107153", "file": "1-2-diaminoethane-see-ethylenediamine-diatomacous-earth-see-silica-amorphous.md", "generated": true, "harvested": "2026-08-05", "id": "1-2-diaminoethane-see-ethylenediamine-diatomacous-earth-see-silica-amorphous", "source_quote": "107153 | | 1,2-Diaminoethane; see Ethylenediamine Diatomacous earth; see Silica-amorphous", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "1,2-Diaminoethane; see Ethylenediamine Diatomacous earth; see Silica-amorphous", "title": "1,2-Diaminoethane; see Ethylenediamine Diatomacous earth; see Silica-amorphous \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** 1,2-Dibromo-3-chloropropane (DBCP); see 1910.1044\n\n**CAS No.:** 96-12-8\n\n> 1,2-Dibromo-3-chloropropane (DBCP); see 1910.1044 | 96-12-8 | - | - | - |\n\nSource: \n", "cas_number": "96-12-8", "file": "1-2-dibromo-3-chloropropane-dbcp-see-1910-1044.md", "generated": true, "harvested": "2026-08-05", "id": "1-2-dibromo-3-chloropropane-dbcp-see-1910-1044", "source_quote": "1,2-Dibromo-3-chloropropane (DBCP); see 1910.1044 | 96-12-8 | - | - | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "1,2-Dibromo-3-chloropropane (DBCP); see 1910.1044", "title": "1,2-Dibromo-3-chloropropane (DBCP); see 1910.1044 \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** 1,2-Dibromo-3-chloropropane; DBCP; see Section 5212\n\n**CAS No.:** 96128\n\n**PEL (ppm):** .001\n\n**PEL (mg/m\u00b3):** .01\n\n> 96128 | | 1,2-Dibromo-3-chloropropane; DBCP; see Section 5212 | .001 | .01\n\nSource: \n", "cas_number": "96128", "file": "1-2-dibromo-3-chloropropane-dbcp-see-section-5212.md", "generated": true, "harvested": "2026-08-05", "id": "1-2-dibromo-3-chloropropane-dbcp-see-section-5212", "pel_mgm3": ".01", "pel_ppm": ".001", "source_quote": "96128 | | 1,2-Dibromo-3-chloropropane; DBCP; see Section 5212 | .001 | .01", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "1,2-Dibromo-3-chloropropane; DBCP; see Section 5212", "title": "1,2-Dibromo-3-chloropropane; DBCP; see Section 5212 \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** 1,2-Dibromo-3-chloropropane\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - 1,2-Dibromo-3-chloropropane\n\n**CAS No.:** 96-12-8\n\n> CAS No. 96-12-8\n\n**NIOSH REL, as stated:** Ca See Appendix A\n\n> NIOSH REL Ca See Appendix A\n\nSource: \n", "cas_number": "96-12-8", "file": "1-2-dibromo-3-chloropropane.md", "generated": true, "harvested": "2026-09-08", "id": "1-2-dibromo-3-chloropropane", "quote_cas_number": "CAS No. 96-12-8", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - 1,2-Dibromo-3-chloropropane", "rel_statement": "Ca See Appendix A", "source_quote": "NIOSH REL Ca See Appendix A", "sources": ["https://www.cdc.gov/niosh/npg/npgd0184.html"], "stale_after": "2027-09-08", "substance": "1,2-Dibromo-3-chloropropane", "title": "1,2-Dibromo-3-chloropropane \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** 1,2-Dibromoethane; see Ethylene dibromide, Section 5219\n\n**CAS No.:** 106934\n\n> 106934 | S | 1,2-Dibromoethane; see Ethylene dibromide, Section 5219\n\nSource: \n", "cas_number": "106934", "file": "1-2-dibromoethane-see-ethylene-dibromide-section-5219.md", "generated": true, "harvested": "2026-08-05", "id": "1-2-dibromoethane-see-ethylene-dibromide-section-5219", "source_quote": "106934 | S | 1,2-Dibromoethane; see Ethylene dibromide, Section 5219", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "1,2-Dibromoethane; see Ethylene dibromide, Section 5219", "title": "1,2-Dibromoethane; see Ethylene dibromide, Section 5219 \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** 1,2-Dichloroethane, see Ethylene dichloride\n\n**CAS No.:** 107062\n\n> 107062 | | 1,2-Dichloroethane, see Ethylene dichloride\n\nSource: \n", "cas_number": "107062", "file": "1-2-dichloroethane-see-ethylene-dichloride.md", "generated": true, "harvested": "2026-08-05", "id": "1-2-dichloroethane-see-ethylene-dichloride", "source_quote": "107062 | | 1,2-Dichloroethane, see Ethylene dichloride", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "1,2-Dichloroethane, see Ethylene dichloride", "title": "1,2-Dichloroethane, see Ethylene dichloride \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** 1,2-Dichloroethylene\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - 1,2-Dichloroethylene\n\n**CAS No.:** 540-59-0\n\n> CAS No. 540-59-0\n\n**NIOSH REL (ppm):** TWA 200\n\n**NIOSH REL (mg/m\u00b3):** 790\n\n> NIOSH REL TWA 200 ppm (790 mg/m3)\n\nSource: \n", "cas_number": "540-59-0", "file": "1-2-dichloroethylene-2.md", "generated": true, "harvested": "2026-09-08", "id": "1-2-dichloroethylene-2", "quote_cas_number": "CAS No. 540-59-0", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - 1,2-Dichloroethylene", "rel_mgm3": "790", "rel_ppm": "TWA 200", "source_quote": "NIOSH REL TWA 200 ppm (790 mg/m3)", "sources": ["https://www.cdc.gov/niosh/npg/npgd0195.html"], "stale_after": "2027-09-08", "substance": "1,2-Dichloroethylene", "title": "1,2-Dichloroethylene \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** 1,2-Dichloroethylene; acetylene dichloride\n\n**CAS No.:** 540590\n\n**PEL (ppm):** 200\n\n**PEL (mg/m\u00b3):** 790\n\n> 540590 | | 1,2-Dichloroethylene; acetylene dichloride | 200 | 790\n\nSource: \n", "cas_number": "540590", "file": "1-2-dichloroethylene-acetylene-dichloride.md", "generated": true, "harvested": "2026-08-05", "id": "1-2-dichloroethylene-acetylene-dichloride", "pel_mgm3": "790", "pel_ppm": "200", "source_quote": "540590 | | 1,2-Dichloroethylene; acetylene dichloride | 200 | 790", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "1,2-Dichloroethylene; acetylene dichloride", "title": "1,2-Dichloroethylene; acetylene dichloride \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** 1,2-Dichloroethylene\n\n**CAS No.:** 540-59-0\n\n**PEL (ppm):** 200\n\n**PEL (mg/m\u00b3):** 790\n\n> 1,2-Dichloroethylene | 540-59-0 | 200 | 790 | - |\n\nSource: \n", "cas_number": "540-59-0", "file": "1-2-dichloroethylene.md", "generated": true, "harvested": "2026-08-05", "id": "1-2-dichloroethylene", "pel_mgm3": "790", "pel_ppm": "200", "source_quote": "1,2-Dichloroethylene | 540-59-0 | 200 | 790 | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "1,2-Dichloroethylene", "title": "1,2-Dichloroethylene \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** 1,2-Dichloropropane; see Propylene dichloride\n\n**CAS No.:** 78875\n\n> 78875 | | 1,2-Dichloropropane; see Propylene dichloride\n\nSource: \n", "cas_number": "78875", "file": "1-2-dichloropropane-see-propylene-dichloride.md", "generated": true, "harvested": "2026-08-05", "id": "1-2-dichloropropane-see-propylene-dichloride", "source_quote": "78875 | | 1,2-Dichloropropane; see Propylene dichloride", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "1,2-Dichloropropane; see Propylene dichloride", "title": "1,2-Dichloropropane; see Propylene dichloride \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** 1,2-Dichlorotetrafluoroethane; Fluorocarbon 114\n\n**CAS No.:** 76142\n\n**PEL (ppm):** 1,000\n\n**PEL (mg/m\u00b3):** 7,000\n\n> 76142 | | 1,2-Dichlorotetrafluoroethane; Fluorocarbon 114 | 1,000 | 7,000\n\nSource: \n", "cas_number": "76142", "file": "1-2-dichlorotetrafluoroethane-fluorocarbon-114.md", "generated": true, "harvested": "2026-08-05", "id": "1-2-dichlorotetrafluoroethane-fluorocarbon-114", "pel_mgm3": "7,000", "pel_ppm": "1,000", "source_quote": "76142 | | 1,2-Dichlorotetrafluoroethane; Fluorocarbon 114 | 1,000 | 7,000", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "1,2-Dichlorotetrafluoroethane; Fluorocarbon 114", "title": "1,2-Dichlorotetrafluoroethane; Fluorocarbon 114 \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** 1,2-Epoxypropane; see Propylene oxide\n\n**CAS No.:** 75569\n\n> 75569 | | 1,2-Epoxypropane; see Propylene oxide\n\nSource: \n", "cas_number": "75569", "file": "1-2-epoxypropane-see-propylene-oxide.md", "generated": true, "harvested": "2026-08-05", "id": "1-2-epoxypropane-see-propylene-oxide", "source_quote": "75569 | | 1,2-Epoxypropane; see Propylene oxide", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "1,2-Epoxypropane; see Propylene oxide", "title": "1,2-Epoxypropane; see Propylene oxide \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** 1,3,5-Triglycidyl-s-triazinetrione\n\n**CAS No.:** 2451629\n\n**PEL (mg/m\u00b3):** 0.005\n\n> 2451629 | | 1,3,5-Triglycidyl-s-triazinetrione | | 0.005\n\nSource: \n", "cas_number": "2451629", "file": "1-3-5-triglycidyl-s-triazinetrione.md", "generated": true, "harvested": "2026-08-05", "id": "1-3-5-triglycidyl-s-triazinetrione", "pel_mgm3": "0.005", "source_quote": "2451629 | | 1,3,5-Triglycidyl-s-triazinetrione | | 0.005", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "1,3,5-Triglycidyl-s-triazinetrione", "title": "1,3,5-Triglycidyl-s-triazinetrione \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** 1,3,5-Trimethylbenzene\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - 1,3,5-Trimethylbenzene\n\n**CAS No.:** 108-67-8\n\n> CAS No. 108-67-8\n\n**NIOSH REL (ppm):** TWA 25\n\n**NIOSH REL (mg/m\u00b3):** 125\n\n> NIOSH REL TWA 25 ppm (125 mg/m3)\n\nSource: \n", "cas_number": "108-67-8", "file": "1-3-5-trimethylbenzene.md", "generated": true, "harvested": "2026-09-08", "id": "1-3-5-trimethylbenzene", "quote_cas_number": "CAS No. 108-67-8", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - 1,3,5-Trimethylbenzene", "rel_mgm3": "125", "rel_ppm": "TWA 25", "source_quote": "NIOSH REL TWA 25 ppm (125 mg/m3)", "sources": ["https://www.cdc.gov/niosh/npg/npgd0639.html"], "stale_after": "2027-09-08", "substance": "1,3,5-Trimethylbenzene", "title": "1,3,5-Trimethylbenzene \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** 1,3-Butadiene (see also section 5201)\n\n**CAS No.:** 106990\n\n**PEL (ppm):** 1\n\n**PEL (mg/m\u00b3):** 2.2\n\n**STEL (ppm):** 5\n\n**STEL (mg/m\u00b3):** 11\n\n> 106990 | | 1,3-Butadiene (see also section 5201) | 1 | 2.2 | | 5 | 11\n\nSource: \n", "cas_number": "106990", "file": "1-3-butadiene-see-also-section-5201.md", "generated": true, "harvested": "2026-08-05", "id": "1-3-butadiene-see-also-section-5201", "pel_mgm3": "2.2", "pel_ppm": "1", "source_quote": "106990 | | 1,3-Butadiene (see also section 5201) | 1 | 2.2 | | 5 | 11", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "stel_mgm3": "11", "stel_ppm": "5", "substance": "1,3-Butadiene (see also section 5201)", "title": "1,3-Butadiene (see also section 5201) \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** 1,3-Butadiene\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - 1,3-Butadiene\n\n**CAS No.:** 106-99-0\n\n> CAS No. 106-99-0\n\n**NIOSH REL, as stated:** Ca See Appendix A\n\n> NIOSH REL Ca See Appendix A\n\nSource: \n", "cas_number": "106-99-0", "file": "1-3-butadiene.md", "generated": true, "harvested": "2026-09-08", "id": "1-3-butadiene", "quote_cas_number": "CAS No. 106-99-0", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - 1,3-Butadiene", "rel_statement": "Ca See Appendix A", "source_quote": "NIOSH REL Ca See Appendix A", "sources": ["https://www.cdc.gov/niosh/npg/npgd0067.html"], "stale_after": "2027-09-08", "substance": "1,3-Butadiene", "title": "1,3-Butadiene \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** 1,3-Dichloro-5,5-dimethyl hydantoin\n\n**CAS No.:** 118525\n\n**PEL (mg/m\u00b3):** 0.2\n\n**STEL (mg/m\u00b3):** 0.4\n\n> 118525 | | 1,3-Dichloro-5,5-dimethyl hydantoin | -- | 0.2 | | -- | 0.4\n\nSource: \n", "cas_number": "118525", "file": "1-3-dichloro-5-5-dimethyl-hydantoin-2.md", "generated": true, "harvested": "2026-08-05", "id": "1-3-dichloro-5-5-dimethyl-hydantoin-2", "pel_mgm3": "0.2", "source_quote": "118525 | | 1,3-Dichloro-5,5-dimethyl hydantoin | -- | 0.2 | | -- | 0.4", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "stel_mgm3": "0.4", "substance": "1,3-Dichloro-5,5-dimethyl hydantoin", "title": "1,3-Dichloro-5,5-dimethyl hydantoin \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** 1,3-Dichloro-5,5-dimethyl hydantoin\n\n**CAS No.:** 118-52-5\n\n**PEL (mg/m\u00b3):** 0.2\n\n> 1,3-Dichloro-5,5-dimethyl hydantoin | 118-52-5 | - | 0.2 | - |\n\nSource: \n", "cas_number": "118-52-5", "file": "1-3-dichloro-5-5-dimethyl-hydantoin.md", "generated": true, "harvested": "2026-08-05", "id": "1-3-dichloro-5-5-dimethyl-hydantoin", "pel_mgm3": "0.2", "source_quote": "1,3-Dichloro-5,5-dimethyl hydantoin | 118-52-5 | - | 0.2 | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "1,3-Dichloro-5,5-dimethyl hydantoin", "title": "1,3-Dichloro-5,5-dimethyl hydantoin \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** 1,3-Dichloro-5,5-dimethylhydantoin\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - 1,3-Dichloro-5,5-dimethylhydantoin\n\n**CAS No.:** 118-52-5\n\n> CAS No. 118-52-5\n\n**NIOSH REL (mg/m\u00b3):** TWA 0.2\n\n> NIOSH REL TWA 0.2 mg/m3 ST 0.4 mg/m3\n\nSource: \n", "cas_number": "118-52-5", "file": "1-3-dichloro-5-5-dimethylhydantoin.md", "generated": true, "harvested": "2026-09-08", "id": "1-3-dichloro-5-5-dimethylhydantoin", "quote_cas_number": "CAS No. 118-52-5", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - 1,3-Dichloro-5,5-dimethylhydantoin", "rel_mgm3": "TWA 0.2", "source_quote": "NIOSH REL TWA 0.2 mg/m3 ST 0.4 mg/m3", "sources": ["https://www.cdc.gov/niosh/npg/npgd0193.html"], "stale_after": "2027-09-08", "substance": "1,3-Dichloro-5,5-dimethylhydantoin", "title": "1,3-Dichloro-5,5-dimethylhydantoin \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** 1,3-Dichloropropene\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - 1,3-Dichloropropene\n\n**CAS No.:** 542-75-6\n\n> CAS No. 542-75-6\n\n**NIOSH REL (ppm):** TWA 1\n\n**NIOSH REL (mg/m\u00b3):** 5\n\n> NIOSH REL Ca TWA 1 ppm (5 mg/m3) [skin]\n\nSource: \n", "cas_number": "542-75-6", "file": "1-3-dichloropropene.md", "generated": true, "harvested": "2026-09-08", "id": "1-3-dichloropropene", "quote_cas_number": "CAS No. 542-75-6", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - 1,3-Dichloropropene", "rel_mgm3": "5", "rel_ppm": "TWA 1", "source_quote": "NIOSH REL Ca TWA 1 ppm (5 mg/m3) [skin]", "sources": ["https://www.cdc.gov/niosh/npg/npgd0199.html"], "stale_after": "2027-09-08", "substance": "1,3-Dichloropropene", "title": "1,3-Dichloropropene \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** 1,3-Dimethylbutyl acetate; see sec-Hexyl acetate\n\n**CAS No.:** 108849\n\n> 108849 | | 1,3-Dimethylbutyl acetate; see sec-Hexyl acetate\n\nSource: \n", "cas_number": "108849", "file": "1-3-dimethylbutyl-acetate-see-sec-hexyl-acetate.md", "generated": true, "harvested": "2026-08-05", "id": "1-3-dimethylbutyl-acetate-see-sec-hexyl-acetate", "source_quote": "108849 | | 1,3-Dimethylbutyl acetate; see sec-Hexyl acetate", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "1,3-Dimethylbutyl acetate; see sec-Hexyl acetate", "title": "1,3-Dimethylbutyl acetate; see sec-Hexyl acetate \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** 1,4-Dichloro-2-butene\n\n**CAS No.:** 764410\n\n**PEL (ppm):** 0.005\n\n**PEL (mg/m\u00b3):** 0.025\n\n> 764410 | S | 1,4-Dichloro-2-butene | 0.005 | 0.025\n\nSource: \n", "cas_number": "764410", "file": "1-4-dichloro-2-butene.md", "generated": true, "harvested": "2026-08-05", "id": "1-4-dichloro-2-butene", "pel_mgm3": "0.025", "pel_ppm": "0.005", "source_quote": "764410 | S | 1,4-Dichloro-2-butene | 0.005 | 0.025", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "1,4-Dichloro-2-butene", "title": "1,4-Dichloro-2-butene \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** 1,4-Diethylene dioxide; see p-Dioxane\n\n**CAS No.:** 123911\n\n> 123911 | | 1,4-Diethylene dioxide; see p-Dioxane\n\nSource: \n", "cas_number": "123911", "file": "1-4-diethylene-dioxide-see-p-dioxane.md", "generated": true, "harvested": "2026-08-05", "id": "1-4-diethylene-dioxide-see-p-dioxane", "source_quote": "123911 | | 1,4-Diethylene dioxide; see p-Dioxane", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "1,4-Diethylene dioxide; see p-Dioxane", "title": "1,4-Diethylene dioxide; see p-Dioxane \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** 1,6-Hexanediamine\n\n**CAS No.:** 124094\n\n**PEL (ppm):** 0.5\n\n**PEL (mg/m\u00b3):** 2.3\n\n> 124094 | | 1,6-Hexanediamine | 0.5 | 2.3\n\nSource: \n", "cas_number": "124094", "file": "1-6-hexanediamine.md", "generated": true, "harvested": "2026-08-05", "id": "1-6-hexanediamine", "pel_mgm3": "2.3", "pel_ppm": "0.5", "source_quote": "124094 | | 1,6-Hexanediamine | 0.5 | 2.3", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "1,6-Hexanediamine", "title": "1,6-Hexanediamine \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** 1-bromopropane, n-propyl bromide\n\n**CAS No.:** 106945\n\n**PEL (ppm):** 5\n\n**PEL (mg/m\u00b3):** 25\n\n> 106945 | S | 1-bromopropane, n-propyl bromide | 5 | 25\n\nSource: \n", "cas_number": "106945", "file": "1-bromopropane-n-propyl-bromide.md", "generated": true, "harvested": "2026-08-05", "id": "1-bromopropane-n-propyl-bromide", "pel_mgm3": "25", "pel_ppm": "5", "source_quote": "106945 | S | 1-bromopropane, n-propyl bromide | 5 | 25", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "1-bromopropane, n-propyl bromide", "title": "1-bromopropane, n-propyl bromide \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** 1-Butanethiol; see Butyl mercaptan\n\n**CAS No.:** 109795\n\n> 109795 | | 1-Butanethiol; see Butyl mercaptan\n\nSource: \n", "cas_number": "109795", "file": "1-butanethiol-see-butyl-mercaptan.md", "generated": true, "harvested": "2026-08-05", "id": "1-butanethiol-see-butyl-mercaptan", "source_quote": "109795 | | 1-Butanethiol; see Butyl mercaptan", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "1-Butanethiol; see Butyl mercaptan", "title": "1-Butanethiol; see Butyl mercaptan \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** 1-Butanol; see n-Butyl alcohol\n\n**CAS No.:** 71363\n\n> 71363 | | 1-Butanol; see n-Butyl alcohol\n\nSource: \n", "cas_number": "71363", "file": "1-butanol-see-n-butyl-alcohol.md", "generated": true, "harvested": "2026-08-05", "id": "1-butanol-see-n-butyl-alcohol", "source_quote": "71363 | | 1-Butanol; see n-Butyl alcohol", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "1-Butanol; see n-Butyl alcohol", "title": "1-Butanol; see n-Butyl alcohol \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** 1-Chloro-1-nitropropane\n\n**CAS No.:** 600259\n\n**PEL (ppm):** 2\n\n**PEL (mg/m\u00b3):** 10\n\n> 600259 | | 1-Chloro-1-nitropropane | 2 | 10\n\nSource: \n", "cas_number": "600259", "file": "1-chloro-1-nitropropane-2.md", "generated": true, "harvested": "2026-08-05", "id": "1-chloro-1-nitropropane-2", "pel_mgm3": "10", "pel_ppm": "2", "source_quote": "600259 | | 1-Chloro-1-nitropropane | 2 | 10", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "1-Chloro-1-nitropropane", "title": "1-Chloro-1-nitropropane \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** 1-Chloro-1-nitropropane\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - 1-Chloro-1-nitropropane\n\n**CAS No.:** 600-25-9\n\n> CAS No. 600-25-9\n\n**NIOSH REL (ppm):** TWA 2\n\n**NIOSH REL (mg/m\u00b3):** 10\n\n> NIOSH REL TWA 2 ppm (10 mg/m3)\n\nSource: \n", "cas_number": "600-25-9", "file": "1-chloro-1-nitropropane-3.md", "generated": true, "harvested": "2026-09-08", "id": "1-chloro-1-nitropropane-3", "quote_cas_number": "CAS No. 600-25-9", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - 1-Chloro-1-nitropropane", "rel_mgm3": "10", "rel_ppm": "TWA 2", "source_quote": "NIOSH REL TWA 2 ppm (10 mg/m3)", "sources": ["https://www.cdc.gov/niosh/npg/npgd0130.html"], "stale_after": "2027-09-08", "substance": "1-Chloro-1-nitropropane", "title": "1-Chloro-1-nitropropane \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** 1-Chloro-1-nitropropane\n\n**CAS No.:** 600-25-9\n\n**PEL (ppm):** 20\n\n**PEL (mg/m\u00b3):** 100\n\n> 1-Chloro-1-nitropropane | 600-25-9 | 20 | 100 | - |\n\nSource: \n", "cas_number": "600-25-9", "file": "1-chloro-1-nitropropane.md", "generated": true, "harvested": "2026-08-05", "id": "1-chloro-1-nitropropane", "pel_mgm3": "100", "pel_ppm": "20", "source_quote": "1-Chloro-1-nitropropane | 600-25-9 | 20 | 100 | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "1-Chloro-1-nitropropane", "title": "1-Chloro-1-nitropropane \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** 1-Chloro-2,3-epoxypropane; see Epichlorohydrin\n\n**CAS No.:** 106898\n\n> 106898 | | 1-Chloro-2,3-epoxypropane; see Epichlorohydrin\n\nSource: \n", "cas_number": "106898", "file": "1-chloro-2-3-epoxypropane-see-epichlorohydrin.md", "generated": true, "harvested": "2026-08-05", "id": "1-chloro-2-3-epoxypropane-see-epichlorohydrin", "source_quote": "106898 | | 1-Chloro-2,3-epoxypropane; see Epichlorohydrin", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "1-Chloro-2,3-epoxypropane; see Epichlorohydrin", "title": "1-Chloro-2,3-epoxypropane; see Epichlorohydrin \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** 1-Chloro-4-nitrobenzene; see p-Nitrochlorobenzene\n\n**CAS No.:** 100005\n\n> 100005 | | 1-Chloro-4-nitrobenzene; see p-Nitrochlorobenzene\n\nSource: \n", "cas_number": "100005", "file": "1-chloro-4-nitrobenzene-see-p-nitrochlorobenzene.md", "generated": true, "harvested": "2026-08-05", "id": "1-chloro-4-nitrobenzene-see-p-nitrochlorobenzene", "source_quote": "100005 | | 1-Chloro-4-nitrobenzene; see p-Nitrochlorobenzene", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "1-Chloro-4-nitrobenzene; see p-Nitrochlorobenzene", "title": "1-Chloro-4-nitrobenzene; see p-Nitrochlorobenzene \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** 1-Decanethiol\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - 1-Decanethiol\n\n**CAS No.:** 143-10-2\n\n> CAS No. 143-10-2\n\n**NIOSH REL (ppm):** C 0.5\n\n**NIOSH REL (mg/m\u00b3):** 3.6\n\n> NIOSH REL C 0.5 ppm (3.6 mg/m3) [15-minute]\n\nSource: \n", "cas_number": "143-10-2", "file": "1-decanethiol.md", "generated": true, "harvested": "2026-09-08", "id": "1-decanethiol", "quote_cas_number": "CAS No. 143-10-2", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - 1-Decanethiol", "rel_mgm3": "3.6", "rel_ppm": "C 0.5", "source_quote": "NIOSH REL C 0.5 ppm (3.6 mg/m3) [15-minute]", "sources": ["https://www.cdc.gov/niosh/npg/npgd0176.html"], "stale_after": "2027-09-08", "substance": "1-Decanethiol", "title": "1-Decanethiol \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** 1-Dodecanethiol\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - 1-Dodecanethiol\n\n**CAS No.:** 112-55-0\n\n> CAS No. 112-55-0\n\n**NIOSH REL (ppm):** C 0.5\n\n**NIOSH REL (mg/m\u00b3):** 4.1\n\n> NIOSH REL C 0.5 ppm (4.1 mg/m3) [15-minute]\n\nSource: \n", "cas_number": "112-55-0", "file": "1-dodecanethiol.md", "generated": true, "harvested": "2026-09-08", "id": "1-dodecanethiol", "quote_cas_number": "CAS No. 112-55-0", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - 1-Dodecanethiol", "rel_mgm3": "4.1", "rel_ppm": "C 0.5", "source_quote": "NIOSH REL C 0.5 ppm (4.1 mg/m3) [15-minute]", "sources": ["https://www.cdc.gov/niosh/npg/npgd0249.html"], "stale_after": "2027-09-08", "substance": "1-Dodecanethiol", "title": "1-Dodecanethiol \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** 1-Heptanethiol\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - 1-Heptanethiol\n\n**CAS No.:** 1639-09-4\n\n> CAS No. 1639-09-4\n\n**NIOSH REL (ppm):** C 0.5\n\n**NIOSH REL (mg/m\u00b3):** 2.7\n\n> NIOSH REL C 0.5 ppm (2.7 mg/m3) [15-minute]\n\nSource: \n", "cas_number": "1639-09-4", "file": "1-heptanethiol.md", "generated": true, "harvested": "2026-09-08", "id": "1-heptanethiol", "quote_cas_number": "CAS No. 1639-09-4", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - 1-Heptanethiol", "rel_mgm3": "2.7", "rel_ppm": "C 0.5", "source_quote": "NIOSH REL C 0.5 ppm (2.7 mg/m3) [15-minute]", "sources": ["https://www.cdc.gov/niosh/npg/npgd0313.html"], "stale_after": "2027-09-08", "substance": "1-Heptanethiol", "title": "1-Heptanethiol \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** 1-Hexadecanethiol\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - 1-Hexadecanethiol\n\n**CAS No.:** 2917-26-2\n\n> CAS No. 2917-26-2\n\n**NIOSH REL (ppm):** C 0.5\n\n**NIOSH REL (mg/m\u00b3):** 5.3\n\n> NIOSH REL C 0.5 ppm (5.3 mg/m3) [15-minute]\n\nSource: \n", "cas_number": "2917-26-2", "file": "1-hexadecanethiol.md", "generated": true, "harvested": "2026-09-08", "id": "1-hexadecanethiol", "quote_cas_number": "CAS No. 2917-26-2", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - 1-Hexadecanethiol", "rel_mgm3": "5.3", "rel_ppm": "C 0.5", "source_quote": "NIOSH REL C 0.5 ppm (5.3 mg/m3) [15-minute]", "sources": ["https://www.cdc.gov/niosh/npg/npgd0318.html"], "stale_after": "2027-09-08", "substance": "1-Hexadecanethiol", "title": "1-Hexadecanethiol \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** 1-Hexene\n\n**CAS No.:** 592416\n\n**PEL (ppm):** 50\n\n**PEL (mg/m\u00b3):** 180\n\n> 592416 | | 1-Hexene | 50 | 180\n\nSource: \n", "cas_number": "592416", "file": "1-hexene.md", "generated": true, "harvested": "2026-08-05", "id": "1-hexene", "pel_mgm3": "180", "pel_ppm": "50", "source_quote": "592416 | | 1-Hexene | 50 | 180", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "1-Hexene", "title": "1-Hexene \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** 1-Naphthyl N-methylcarbamate; see Carbaryl\n\n**CAS No.:** 63252\n\n> 63252 | | 1-Naphthyl N-methylcarbamate; see Carbaryl\n\nSource: \n", "cas_number": "63252", "file": "1-naphthyl-n-methylcarbamate-see-carbaryl.md", "generated": true, "harvested": "2026-08-05", "id": "1-naphthyl-n-methylcarbamate-see-carbaryl", "source_quote": "63252 | | 1-Naphthyl N-methylcarbamate; see Carbaryl", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "1-Naphthyl N-methylcarbamate; see Carbaryl", "title": "1-Naphthyl N-methylcarbamate; see Carbaryl \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** 1-Nitropropane\n\n**CAS No.:** 108032\n\n**PEL (ppm):** 25\n\n**PEL (mg/m\u00b3):** 90\n\n> 108032 | | 1-Nitropropane | 25 | 90\n\nSource: \n", "cas_number": "108032", "file": "1-nitropropane-2.md", "generated": true, "harvested": "2026-08-05", "id": "1-nitropropane-2", "pel_mgm3": "90", "pel_ppm": "25", "source_quote": "108032 | | 1-Nitropropane | 25 | 90", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "1-Nitropropane", "title": "1-Nitropropane \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** 1-Nitropropane\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - 1-Nitropropane\n\n**CAS No.:** 108-03-2\n\n> CAS No. 108-03-2\n\n**NIOSH REL (ppm):** TWA 25\n\n**NIOSH REL (mg/m\u00b3):** 90\n\n> NIOSH REL TWA 25 ppm (90 mg/m3)\n\nSource: \n", "cas_number": "108-03-2", "file": "1-nitropropane-3.md", "generated": true, "harvested": "2026-09-08", "id": "1-nitropropane-3", "quote_cas_number": "CAS No. 108-03-2", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - 1-Nitropropane", "rel_mgm3": "90", "rel_ppm": "TWA 25", "source_quote": "NIOSH REL TWA 25 ppm (90 mg/m3)", "sources": ["https://www.cdc.gov/niosh/npg/npgd0459.html"], "stale_after": "2027-09-08", "substance": "1-Nitropropane", "title": "1-Nitropropane \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** 1-Nitropropane\n\n**CAS No.:** 108-03-2\n\n**PEL (ppm):** 25\n\n**PEL (mg/m\u00b3):** 90\n\n> 1-Nitropropane | 108-03-2 | 25 | 90 | - |\n\nSource: \n", "cas_number": "108-03-2", "file": "1-nitropropane.md", "generated": true, "harvested": "2026-08-05", "id": "1-nitropropane", "pel_mgm3": "90", "pel_ppm": "25", "source_quote": "1-Nitropropane | 108-03-2 | 25 | 90 | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "1-Nitropropane", "title": "1-Nitropropane \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** 1-Nonanethiol\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - 1-Nonanethiol\n\n**CAS No.:** 1455-21-6\n\n> CAS No. 1455-21-6\n\n**NIOSH REL (ppm):** C 0.5\n\n**NIOSH REL (mg/m\u00b3):** 3.3\n\n> NIOSH REL C 0.5 ppm (3.3 mg/m3) [15-minute]\n\nSource: \n", "cas_number": "1455-21-6", "file": "1-nonanethiol.md", "generated": true, "harvested": "2026-09-08", "id": "1-nonanethiol", "quote_cas_number": "CAS No. 1455-21-6", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - 1-Nonanethiol", "rel_mgm3": "3.3", "rel_ppm": "C 0.5", "source_quote": "NIOSH REL C 0.5 ppm (3.3 mg/m3) [15-minute]", "sources": ["https://www.cdc.gov/niosh/npg/npgd0467.html"], "stale_after": "2027-09-08", "substance": "1-Nonanethiol", "title": "1-Nonanethiol \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** 1-Octadecanethiol\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - 1-Octadecanethiol\n\n**CAS No.:** 2885-00-9\n\n> CAS No. 2885-00-9\n\n**NIOSH REL (ppm):** C 0.5\n\n**NIOSH REL (mg/m\u00b3):** 5.9\n\n> NIOSH REL C 0.5 ppm (5.9 mg/m3) [15-minute]\n\nSource: \n", "cas_number": "2885-00-9", "file": "1-octadecanethiol.md", "generated": true, "harvested": "2026-09-08", "id": "1-octadecanethiol", "quote_cas_number": "CAS No. 2885-00-9", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - 1-Octadecanethiol", "rel_mgm3": "5.9", "rel_ppm": "C 0.5", "source_quote": "NIOSH REL C 0.5 ppm (5.9 mg/m3) [15-minute]", "sources": ["https://www.cdc.gov/niosh/npg/npgd0469.html"], "stale_after": "2027-09-08", "substance": "1-Octadecanethiol", "title": "1-Octadecanethiol \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** 1-Octanethiol\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - 1-Octanethiol\n\n**CAS No.:** 111-88-6\n\n> CAS No. 111-88-6\n\n**NIOSH REL (ppm):** C 0.5\n\n**NIOSH REL (mg/m\u00b3):** 3.0\n\n> NIOSH REL C 0.5 ppm (3.0 mg/m3) [15-minute]\n\nSource: \n", "cas_number": "111-88-6", "file": "1-octanethiol.md", "generated": true, "harvested": "2026-09-08", "id": "1-octanethiol", "quote_cas_number": "CAS No. 111-88-6", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - 1-Octanethiol", "rel_mgm3": "3.0", "rel_ppm": "C 0.5", "source_quote": "NIOSH REL C 0.5 ppm (3.0 mg/m3) [15-minute]", "sources": ["https://www.cdc.gov/niosh/npg/npgd0471.html"], "stale_after": "2027-09-08", "substance": "1-Octanethiol", "title": "1-Octanethiol \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** 1-Pentanethiol\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - 1-Pentanethiol\n\n**CAS No.:** 110-66-7\n\n> CAS No. 110-66-7\n\n**NIOSH REL (ppm):** C 0.5\n\n**NIOSH REL (mg/m\u00b3):** 2.1\n\n> NIOSH REL C 0.5 ppm (2.1 mg/m3) [15-minute]\n\nSource: \n", "cas_number": "110-66-7", "file": "1-pentanethiol.md", "generated": true, "harvested": "2026-09-08", "id": "1-pentanethiol", "quote_cas_number": "CAS No. 110-66-7", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - 1-Pentanethiol", "rel_mgm3": "2.1", "rel_ppm": "C 0.5", "source_quote": "NIOSH REL C 0.5 ppm (2.1 mg/m3) [15-minute]", "sources": ["https://www.cdc.gov/niosh/npg/npgd0487.html"], "stale_after": "2027-09-08", "substance": "1-Pentanethiol", "title": "1-Pentanethiol \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** 1-Propanethiol\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - 1-Propanethiol\n\n**CAS No.:** 107-03-9\n\n> CAS No. 107-03-9\n\n**NIOSH REL (ppm):** C 0.5\n\n**NIOSH REL (mg/m\u00b3):** 1.6\n\n> NIOSH REL C 0.5 ppm (1.6 mg/m3) [15-minute]\n\nSource: \n", "cas_number": "107-03-9", "file": "1-propanethiol.md", "generated": true, "harvested": "2026-09-08", "id": "1-propanethiol", "quote_cas_number": "CAS No. 107-03-9", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - 1-Propanethiol", "rel_mgm3": "1.6", "rel_ppm": "C 0.5", "source_quote": "NIOSH REL C 0.5 ppm (1.6 mg/m3) [15-minute]", "sources": ["https://www.cdc.gov/niosh/npg/npgd0526.html"], "stale_after": "2027-09-08", "substance": "1-Propanethiol", "title": "1-Propanethiol \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** 1-Undecanethiol\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - 1-Undecanethiol\n\n**CAS No.:** 5332-52-5\n\n> CAS No. 5332-52-5\n\n**NIOSH REL (ppm):** C 0.5\n\n**NIOSH REL (mg/m\u00b3):** 3.9\n\n> NIOSH REL C 0.5 ppm (3.9 mg/m3) [15-minute]\n\nSource: \n", "cas_number": "5332-52-5", "file": "1-undecanethiol.md", "generated": true, "harvested": "2026-09-08", "id": "1-undecanethiol", "quote_cas_number": "CAS No. 5332-52-5", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - 1-Undecanethiol", "rel_mgm3": "3.9", "rel_ppm": "C 0.5", "source_quote": "NIOSH REL C 0.5 ppm (3.9 mg/m3) [15-minute]", "sources": ["https://www.cdc.gov/niosh/npg/npgd0649.html"], "stale_after": "2027-09-08", "substance": "1-Undecanethiol", "title": "1-Undecanethiol \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** 2,2\u2032-Azobisisobutyronitrile decomposition product, see Tetramethyl succinonitrile\n\n**CAS No.:** 3333526\n\n> 3333526 | S | 2,2\u2032-Azobisisobutyronitrile decomposition product, see Tetramethyl succinonitrile\n\nSource: \n", "cas_number": "3333526", "file": "2-2-azobisisobutyronitrile-decomposition-product-see-tetramethyl-succinonitrile.md", "generated": true, "harvested": "2026-08-05", "id": "2-2-azobisisobutyronitrile-decomposition-product-see-tetramethyl-succinonitrile", "source_quote": "3333526 | S | 2,2\u2032-Azobisisobutyronitrile decomposition product, see Tetramethyl succinonitrile", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "2,2\u2032-Azobisisobutyronitrile decomposition product, see Tetramethyl succinonitrile", "title": "2,2\u2032-Azobisisobutyronitrile decomposition product, see Tetramethyl succinonitrile \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** 2,2-Dichloropropionic acid\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - 2,2-Dichloropropionic acid\n\n**CAS No.:** 75-99-0\n\n> CAS No. 75-99-0\n\n**NIOSH REL (ppm):** TWA 1\n\n**NIOSH REL (mg/m\u00b3):** 6\n\n> NIOSH REL TWA 1 ppm (6 mg/m3)\n\nSource: \n", "cas_number": "75-99-0", "file": "2-2-dichloropropionic-acid-2.md", "generated": true, "harvested": "2026-09-08", "id": "2-2-dichloropropionic-acid-2", "quote_cas_number": "CAS No. 75-99-0", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - 2,2-Dichloropropionic acid", "rel_mgm3": "6", "rel_ppm": "TWA 1", "source_quote": "NIOSH REL TWA 1 ppm (6 mg/m3)", "sources": ["https://www.cdc.gov/niosh/npg/npgd0200.html"], "stale_after": "2027-09-08", "substance": "2,2-Dichloropropionic acid", "title": "2,2-Dichloropropionic acid \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** 2,2-Dichloropropionic acid\n\n**CAS No.:** 75990\n\n**PEL (ppm):** 1\n\n**PEL (mg/m\u00b3):** 6\n\n> 75990 | | 2,2-Dichloropropionic acid | 1 | 6\n\nSource: \n", "cas_number": "75990", "file": "2-2-dichloropropionic-acid.md", "generated": true, "harvested": "2026-08-05", "id": "2-2-dichloropropionic-acid", "pel_mgm3": "6", "pel_ppm": "1", "source_quote": "75990 | | 2,2-Dichloropropionic acid | 1 | 6", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "2,2-Dichloropropionic acid", "title": "2,2-Dichloropropionic acid \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** 2,3,7,8-Tetrachloro-dibenzo-p-dioxin\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - 2,3,7,8-Tetrachloro-dibenzo-p-dioxin\n\n**CAS No.:** 1746-01-6\n\n> CAS No. 1746-01-6\n\n**NIOSH REL, as stated:** Ca See Appendix A\n\n> NIOSH REL Ca See Appendix A\n\nSource: \n", "cas_number": "1746-01-6", "file": "2-3-7-8-tetrachloro-dibenzo-p-dioxin.md", "generated": true, "harvested": "2026-09-08", "id": "2-3-7-8-tetrachloro-dibenzo-p-dioxin", "quote_cas_number": "CAS No. 1746-01-6", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - 2,3,7,8-Tetrachloro-dibenzo-p-dioxin", "rel_statement": "Ca See Appendix A", "source_quote": "NIOSH REL Ca See Appendix A", "sources": ["https://www.cdc.gov/niosh/npg/npgd0594.html"], "stale_after": "2027-09-08", "substance": "2,3,7,8-Tetrachloro-dibenzo-p-dioxin", "title": "2,3,7,8-Tetrachloro-dibenzo-p-dioxin \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** 2,3-Epoxypropanol; see Glycidol\n\n**CAS No.:** 556525\n\n> 556525 | | 2,3-Epoxypropanol; see Glycidol\n\nSource: \n", "cas_number": "556525", "file": "2-3-epoxypropanol-see-glycidol.md", "generated": true, "harvested": "2026-08-05", "id": "2-3-epoxypropanol-see-glycidol", "source_quote": "556525 | | 2,3-Epoxypropanol; see Glycidol", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "2,3-Epoxypropanol; see Glycidol", "title": "2,3-Epoxypropanol; see Glycidol \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** 2,4,5-T;2,4,5-trichlorophenoxyacetic acid Talc; see Silicates\n\n**CAS No.:** 93765\n\n**PEL (mg/m\u00b3):** 10\n\n> 93765 | | 2,4,5-T;2,4,5-trichlorophenoxyacetic acid Talc; see Silicates | -- | 10\n\nSource: \n", "cas_number": "93765", "file": "2-4-5-t-2-4-5-trichlorophenoxyacetic-acid-talc-see-silicates.md", "generated": true, "harvested": "2026-08-05", "id": "2-4-5-t-2-4-5-trichlorophenoxyacetic-acid-talc-see-silicates", "pel_mgm3": "10", "source_quote": "93765 | | 2,4,5-T;2,4,5-trichlorophenoxyacetic acid Talc; see Silicates | -- | 10", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "2,4,5-T;2,4,5-trichlorophenoxyacetic acid Talc; see Silicates", "title": "2,4,5-T;2,4,5-trichlorophenoxyacetic acid Talc; see Silicates \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** 2,4,5-T (2,4,5-trichlorophenoxyacetic acid)\n\n**CAS No.:** 93-76-5\n\n**PEL (mg/m\u00b3):** 10\n\n> 2,4,5-T (2,4,5-trichlorophenoxyacetic acid) | 93-76-5 | - | 10 | - |\n\nSource: \n", "cas_number": "93-76-5", "file": "2-4-5-t-2-4-5-trichlorophenoxyacetic-acid.md", "generated": true, "harvested": "2026-08-05", "id": "2-4-5-t-2-4-5-trichlorophenoxyacetic-acid", "pel_mgm3": "10", "source_quote": "2,4,5-T (2,4,5-trichlorophenoxyacetic acid) | 93-76-5 | - | 10 | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "2,4,5-T (2,4,5-trichlorophenoxyacetic acid)", "title": "2,4,5-T (2,4,5-trichlorophenoxyacetic acid) \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** 2,4,5-T\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - 2,4,5-T\n\n**CAS No.:** 93-76-5\n\n> CAS No. 93-76-5\n\n**NIOSH REL (mg/m\u00b3):** TWA 10\n\n> NIOSH REL TWA 10 mg/m3\n\nSource: \n", "cas_number": "93-76-5", "file": "2-4-5-t.md", "generated": true, "harvested": "2026-09-08", "id": "2-4-5-t", "quote_cas_number": "CAS No. 93-76-5", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - 2,4,5-T", "rel_mgm3": "TWA 10", "source_quote": "NIOSH REL TWA 10 mg/m3", "sources": ["https://www.cdc.gov/niosh/npg/npgd0583.html"], "stale_after": "2027-09-08", "substance": "2,4,5-T", "title": "2,4,5-T \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** 2,4,5-Trichlorophenoxyacetic acid see 2,4,5-T\n\n**CAS No.:** 93765\n\n> 93765 | | 2,4,5-Trichlorophenoxyacetic acid see 2,4,5-T\n\nSource: \n", "cas_number": "93765", "file": "2-4-5-trichlorophenoxyacetic-acid-see-2-4-5-t.md", "generated": true, "harvested": "2026-08-05", "id": "2-4-5-trichlorophenoxyacetic-acid-see-2-4-5-t", "source_quote": "93765 | | 2,4,5-Trichlorophenoxyacetic acid see 2,4,5-T", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "2,4,5-Trichlorophenoxyacetic acid see 2,4,5-T", "title": "2,4,5-Trichlorophenoxyacetic acid see 2,4,5-T \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** 2,4,6-Trinitrophenol; see Picric acid\n\n**CAS No.:** 88891\n\n> 88891 | | 2,4,6-Trinitrophenol; see Picric acid\n\nSource: \n", "cas_number": "88891", "file": "2-4-6-trinitrophenol-see-picric-acid.md", "generated": true, "harvested": "2026-08-05", "id": "2-4-6-trinitrophenol-see-picric-acid", "source_quote": "88891 | | 2,4,6-Trinitrophenol; see Picric acid", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "2,4,6-Trinitrophenol; see Picric acid", "title": "2,4,6-Trinitrophenol; see Picric acid \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** 2,4,6-Trinitrophenylmethyl nitramine; see Tetryl\n\n**CAS No.:** 479458\n\n> 479458 | | 2,4,6-Trinitrophenylmethyl nitramine; see Tetryl\n\nSource: \n", "cas_number": "479458", "file": "2-4-6-trinitrophenylmethyl-nitramine-see-tetryl.md", "generated": true, "harvested": "2026-08-05", "id": "2-4-6-trinitrophenylmethyl-nitramine-see-tetryl", "source_quote": "479458 | | 2,4,6-Trinitrophenylmethyl nitramine; see Tetryl", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "2,4,6-Trinitrophenylmethyl nitramine; see Tetryl", "title": "2,4,6-Trinitrophenylmethyl nitramine; see Tetryl \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** 2,4,6-Trinitrotoluene; TNT\n\n**CAS No.:** 118967\n\n**PEL (mg/m\u00b3):** 0.5\n\n> 118967 | S | 2,4,6-Trinitrotoluene; TNT | -- | 0.5\n\nSource: \n", "cas_number": "118967", "file": "2-4-6-trinitrotoluene-tnt-2.md", "generated": true, "harvested": "2026-08-05", "id": "2-4-6-trinitrotoluene-tnt-2", "pel_mgm3": "0.5", "source_quote": "118967 | S | 2,4,6-Trinitrotoluene; TNT | -- | 0.5", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "2,4,6-Trinitrotoluene; TNT", "title": "2,4,6-Trinitrotoluene; TNT \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** 2,4,6-Trinitrotoluene (TNT)\n\n**CAS No.:** 118-96-7\n\n**PEL (mg/m\u00b3):** 1.5\n\n> 2,4,6-Trinitrotoluene (TNT) | 118-96-7 | - | 1.5 | X |\n\nSource: \n", "cas_number": "118-96-7", "file": "2-4-6-trinitrotoluene-tnt.md", "generated": true, "harvested": "2026-08-05", "id": "2-4-6-trinitrotoluene-tnt", "pel_mgm3": "1.5", "source_quote": "2,4,6-Trinitrotoluene (TNT) | 118-96-7 | - | 1.5 | X |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "2,4,6-Trinitrotoluene (TNT)", "title": "2,4,6-Trinitrotoluene (TNT) \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** 2,4,6-Trinitrotoluene\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - 2,4,6-Trinitrotoluene\n\n**CAS No.:** 118-96-7\n\n> CAS No. 118-96-7\n\n**NIOSH REL (mg/m\u00b3):** TWA 0.5\n\n> NIOSH REL TWA 0.5 mg/m3 [skin]\n\nSource: \n", "cas_number": "118-96-7", "file": "2-4-6-trinitrotoluene.md", "generated": true, "harvested": "2026-09-08", "id": "2-4-6-trinitrotoluene", "quote_cas_number": "CAS No. 118-96-7", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - 2,4,6-Trinitrotoluene", "rel_mgm3": "TWA 0.5", "source_quote": "NIOSH REL TWA 0.5 mg/m3 [skin]", "sources": ["https://www.cdc.gov/niosh/npg/npgd0641.html"], "stale_after": "2027-09-08", "substance": "2,4,6-Trinitrotoluene", "title": "2,4,6-Trinitrotoluene \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** 2,4-D;2,4-dichlorophenoxyacetic acid\n\n**CAS No.:** 94757\n\n**PEL (mg/m\u00b3):** 10\n\n> 94757 | | 2,4-D;2,4-dichlorophenoxyacetic acid | -- | 10\n\nSource: \n", "cas_number": "94757", "file": "2-4-d-2-4-dichlorophenoxyacetic-acid.md", "generated": true, "harvested": "2026-08-05", "id": "2-4-d-2-4-dichlorophenoxyacetic-acid", "pel_mgm3": "10", "source_quote": "94757 | | 2,4-D;2,4-dichlorophenoxyacetic acid | -- | 10", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "2,4-D;2,4-dichlorophenoxyacetic acid", "title": "2,4-D;2,4-dichlorophenoxyacetic acid \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** 2,4-D (Dichlorophenoxyacetic acid)\n\n**CAS No.:** 94-75-7\n\n**PEL (mg/m\u00b3):** 10\n\n> 2,4-D (Dichlorophenoxyacetic acid) | 94-75-7 | - | 10 | - |\n\nSource: \n", "cas_number": "94-75-7", "file": "2-4-d-dichlorophenoxyacetic-acid.md", "generated": true, "harvested": "2026-08-05", "id": "2-4-d-dichlorophenoxyacetic-acid", "pel_mgm3": "10", "source_quote": "2,4-D (Dichlorophenoxyacetic acid) | 94-75-7 | - | 10 | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "2,4-D (Dichlorophenoxyacetic acid)", "title": "2,4-D (Dichlorophenoxyacetic acid) \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** 2,4-D\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - 2,4-D\n\n**CAS No.:** 94-75-7\n\n> CAS No. 94-75-7\n\n**NIOSH REL (mg/m\u00b3):** TWA 10\n\n> NIOSH REL TWA 10 mg/m3\n\nSource: \n", "cas_number": "94-75-7", "file": "2-4-d.md", "generated": true, "harvested": "2026-09-08", "id": "2-4-d", "quote_cas_number": "CAS No. 94-75-7", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - 2,4-D", "rel_mgm3": "TWA 10", "source_quote": "NIOSH REL TWA 10 mg/m3", "sources": ["https://www.cdc.gov/niosh/npg/npgd0173.html"], "stale_after": "2027-09-08", "substance": "2,4-D", "title": "2,4-D \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** 2,4-Diaminoanisole (and its salts)\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - 2,4-Diaminoanisole (and its salts)\n\n**CAS No.:** 615-05-4\n\n> CAS No. 615-05-4\n\n**NIOSH REL, as stated:** Ca Minimize occupational exposure (especially skin exposures) See Appendix A\n\n> NIOSH REL Ca Minimize occupational exposure (especially skin exposures) See Appendix A\n\nSource: \n", "cas_number": "615-05-4", "file": "2-4-diaminoanisole-and-its-salts.md", "generated": true, "harvested": "2026-09-08", "id": "2-4-diaminoanisole-and-its-salts", "quote_cas_number": "CAS No. 615-05-4", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - 2,4-Diaminoanisole (and its salts)", "rel_statement": "Ca Minimize occupational exposure (especially skin exposures) See Appendix A", "source_quote": "NIOSH REL Ca Minimize occupational exposure (especially skin exposures) See Appendix A", "sources": ["https://www.cdc.gov/niosh/npg/npgd0179.html"], "stale_after": "2027-09-08", "substance": "2,4-Diaminoanisole (and its salts)", "title": "2,4-Diaminoanisole (and its salts) \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** 2,4-Dinitrotoluene\n\n**CAS No.:** 25321146\n\n**PEL (mg/m\u00b3):** 0.15\n\n> 25321146 | S | 2,4-Dinitrotoluene | -- | 0.15\n\nSource: \n", "cas_number": "25321146", "file": "2-4-dinitrotoluene.md", "generated": true, "harvested": "2026-08-05", "id": "2-4-dinitrotoluene", "pel_mgm3": "0.15", "source_quote": "25321146 | S | 2,4-Dinitrotoluene | -- | 0.15", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "2,4-Dinitrotoluene", "title": "2,4-Dinitrotoluene \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** 2,6-Di-tert-butyl-p-cresol\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - 2,6-Di-tert-butyl-p-cresol\n\n**CAS No.:** 128-37-0\n\n> CAS No. 128-37-0\n\n**NIOSH REL (mg/m\u00b3):** TWA 10\n\n> NIOSH REL TWA 10 mg/m3\n\nSource: \n", "cas_number": "128-37-0", "file": "2-6-di-tert-butyl-p-cresol-2.md", "generated": true, "harvested": "2026-09-08", "id": "2-6-di-tert-butyl-p-cresol-2", "quote_cas_number": "CAS No. 128-37-0", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - 2,6-Di-tert-butyl-p-cresol", "rel_mgm3": "TWA 10", "source_quote": "NIOSH REL TWA 10 mg/m3", "sources": ["https://www.cdc.gov/niosh/npg/npgd0246.html"], "stale_after": "2027-09-08", "substance": "2,6-Di-tert-butyl-p-cresol", "title": "2,6-Di-tert-butyl-p-cresol \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** 2,6-Di-tert-butyl-p-cresol\n\n**CAS No.:** 128370\n\n**PEL (mg/m\u00b3):** 10\n\n> 128370 | | 2,6-Di-tert-butyl-p-cresol | -- | 10\n\nSource: \n", "cas_number": "128370", "file": "2-6-di-tert-butyl-p-cresol.md", "generated": true, "harvested": "2026-08-05", "id": "2-6-di-tert-butyl-p-cresol", "pel_mgm3": "10", "source_quote": "128370 | | 2,6-Di-tert-butyl-p-cresol | -- | 10", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "2,6-Di-tert-butyl-p-cresol", "title": "2,6-Di-tert-butyl-p-cresol \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** 2,6-Dimethyl-4-heptanone; see Diisobutyl ketone\n\n**CAS No.:** 108838\n\n> 108838 | | 2,6-Dimethyl-4-heptanone; see Diisobutyl ketone\n\nSource: \n", "cas_number": "108838", "file": "2-6-dimethyl-4-heptanone-see-diisobutyl-ketone.md", "generated": true, "harvested": "2026-08-05", "id": "2-6-dimethyl-4-heptanone-see-diisobutyl-ketone", "source_quote": "108838 | | 2,6-Dimethyl-4-heptanone; see Diisobutyl ketone", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "2,6-Dimethyl-4-heptanone; see Diisobutyl ketone", "title": "2,6-Dimethyl-4-heptanone; see Diisobutyl ketone \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** 2-Acetylaminofluorene; N-fluoren-2-yl acetamide; see Section 5209\n\n**CAS No.:** 53963\n\n> 53963 | S | 2-Acetylaminofluorene; N-fluoren-2-yl acetamide; see Section 5209\n\nSource: \n", "cas_number": "53963", "file": "2-acetylaminofluorene-n-fluoren-2-yl-acetamide-see-section-5209.md", "generated": true, "harvested": "2026-08-05", "id": "2-acetylaminofluorene-n-fluoren-2-yl-acetamide-see-section-5209", "source_quote": "53963 | S | 2-Acetylaminofluorene; N-fluoren-2-yl acetamide; see Section 5209", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "2-Acetylaminofluorene; N-fluoren-2-yl acetamide; see Section 5209", "title": "2-Acetylaminofluorene; N-fluoren-2-yl acetamide; see Section 5209 \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** 2-Acetylaminofluorene\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - 2-Acetylaminofluorene\n\n**CAS No.:** 53-96-3\n\n> CAS No. 53-96-3\n\n**NIOSH REL, as stated:** Ca See Appendix A\n\n> NIOSH REL Ca See Appendix A\n\nSource: \n", "cas_number": "53-96-3", "file": "2-acetylaminofluorene.md", "generated": true, "harvested": "2026-09-08", "id": "2-acetylaminofluorene", "quote_cas_number": "CAS No. 53-96-3", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - 2-Acetylaminofluorene", "rel_statement": "Ca See Appendix A", "source_quote": "NIOSH REL Ca See Appendix A", "sources": ["https://www.cdc.gov/niosh/npg/npgd0007.html"], "stale_after": "2027-09-08", "substance": "2-Acetylaminofluorene", "title": "2-Acetylaminofluorene \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** 2-Acetylaminofluorine; see 1910.1014\n\n**CAS No.:** 53-96-3\n\n> 2-Acetylaminofluorine; see 1910.1014 | 53-96-3 | - | - | - |\n\nSource: \n", "cas_number": "53-96-3", "file": "2-acetylaminofluorine-see-1910-1014.md", "generated": true, "harvested": "2026-08-05", "id": "2-acetylaminofluorine-see-1910-1014", "source_quote": "2-Acetylaminofluorine; see 1910.1014 | 53-96-3 | - | - | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "2-Acetylaminofluorine; see 1910.1014", "title": "2-Acetylaminofluorine; see 1910.1014 \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** 2-Aminoethanol; see Ethanolamine\n\n**CAS No.:** 141435\n\n> 141435 | | 2-Aminoethanol; see Ethanolamine\n\nSource: \n", "cas_number": "141435", "file": "2-aminoethanol-see-ethanolamine.md", "generated": true, "harvested": "2026-08-05", "id": "2-aminoethanol-see-ethanolamine", "source_quote": "141435 | | 2-Aminoethanol; see Ethanolamine", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "2-Aminoethanol; see Ethanolamine", "title": "2-Aminoethanol; see Ethanolamine \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** 2-Aminonapthalene; see beta-Naphthylamine, Section 5209\n\n**CAS No.:** 91598\n\n> 91598 | | 2-Aminonapthalene; see beta-Naphthylamine, Section 5209\n\nSource: \n", "cas_number": "91598", "file": "2-aminonapthalene-see-beta-naphthylamine-section-5209.md", "generated": true, "harvested": "2026-08-05", "id": "2-aminonapthalene-see-beta-naphthylamine-section-5209", "source_quote": "91598 | | 2-Aminonapthalene; see beta-Naphthylamine, Section 5209", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "2-Aminonapthalene; see beta-Naphthylamine, Section 5209", "title": "2-Aminonapthalene; see beta-Naphthylamine, Section 5209 \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** 2-Aminopyridine\n\n**CAS No.:** 504290\n\n**PEL (ppm):** 0.5\n\n**PEL (mg/m\u00b3):** 2\n\n> 504290 | | 2-Aminopyridine | 0.5 | 2\n\nSource: \n", "cas_number": "504290", "file": "2-aminopyridine-2.md", "generated": true, "harvested": "2026-08-05", "id": "2-aminopyridine-2", "pel_mgm3": "2", "pel_ppm": "0.5", "source_quote": "504290 | | 2-Aminopyridine | 0.5 | 2", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "2-Aminopyridine", "title": "2-Aminopyridine \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** 2-Aminopyridine\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - 2-Aminopyridine\n\n**CAS No.:** 504-29-0\n\n> CAS No. 504-29-0\n\n**NIOSH REL (ppm):** TWA 0.5\n\n**NIOSH REL (mg/m\u00b3):** 2\n\n> NIOSH REL TWA 0.5 ppm (2 mg/m3)\n\nSource: \n", "cas_number": "504-29-0", "file": "2-aminopyridine-3.md", "generated": true, "harvested": "2026-09-08", "id": "2-aminopyridine-3", "quote_cas_number": "CAS No. 504-29-0", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - 2-Aminopyridine", "rel_mgm3": "2", "rel_ppm": "TWA 0.5", "source_quote": "NIOSH REL TWA 0.5 ppm (2 mg/m3)", "sources": ["https://www.cdc.gov/niosh/npg/npgd0026.html"], "stale_after": "2027-09-08", "substance": "2-Aminopyridine", "title": "2-Aminopyridine \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** 2-Aminopyridine\n\n**CAS No.:** 504-29-0\n\n**PEL (ppm):** 0.5\n\n**PEL (mg/m\u00b3):** 2\n\n> 2-Aminopyridine | 504-29-0 | 0.5 | 2 | - |\n\nSource: \n", "cas_number": "504-29-0", "file": "2-aminopyridine.md", "generated": true, "harvested": "2026-08-05", "id": "2-aminopyridine", "pel_mgm3": "2", "pel_ppm": "0.5", "source_quote": "2-Aminopyridine | 504-29-0 | 0.5 | 2 | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "2-Aminopyridine", "title": "2-Aminopyridine \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** 2-Butanone (Methyl ethyl ketone)\n\n**CAS No.:** 78-93-3\n\n**PEL (ppm):** 200\n\n**PEL (mg/m\u00b3):** 590\n\n> 2-Butanone (Methyl ethyl ketone) | 78-93-3 | 200 | 590 | - |\n\nSource: \n", "cas_number": "78-93-3", "file": "2-butanone-methyl-ethyl-ketone.md", "generated": true, "harvested": "2026-08-05", "id": "2-butanone-methyl-ethyl-ketone", "pel_mgm3": "590", "pel_ppm": "200", "source_quote": "2-Butanone (Methyl ethyl ketone) | 78-93-3 | 200 | 590 | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "2-Butanone (Methyl ethyl ketone)", "title": "2-Butanone (Methyl ethyl ketone) \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** 2-Butanone; see Methyl ethyl ketone\n\n**CAS No.:** 78933\n\n> 78933 | | 2-Butanone; see Methyl ethyl ketone\n\nSource: \n", "cas_number": "78933", "file": "2-butanone-see-methyl-ethyl-ketone.md", "generated": true, "harvested": "2026-08-05", "id": "2-butanone-see-methyl-ethyl-ketone", "source_quote": "78933 | | 2-Butanone; see Methyl ethyl ketone", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "2-Butanone; see Methyl ethyl ketone", "title": "2-Butanone; see Methyl ethyl ketone \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** 2-Butanone\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - 2-Butanone\n\n**CAS No.:** 78-93-3\n\n> CAS No. 78-93-3\n\n**NIOSH REL (ppm):** TWA 200\n\n**NIOSH REL (mg/m\u00b3):** 590\n\n> NIOSH REL TWA 200 ppm (590 mg/m3) ST 300 ppm (885 mg/m3)\n\nSource: \n", "cas_number": "78-93-3", "file": "2-butanone.md", "generated": true, "harvested": "2026-09-08", "id": "2-butanone", "quote_cas_number": "CAS No. 78-93-3", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - 2-Butanone", "rel_mgm3": "590", "rel_ppm": "TWA 200", "source_quote": "NIOSH REL TWA 200 ppm (590 mg/m3) ST 300 ppm (885 mg/m3)", "sources": ["https://www.cdc.gov/niosh/npg/npgd0069.html"], "stale_after": "2027-09-08", "substance": "2-Butanone", "title": "2-Butanone \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** 2-Butoxyethanol\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - 2-Butoxyethanol\n\n**CAS No.:** 111-76-2\n\n> CAS No. 111-76-2\n\n**NIOSH REL (ppm):** TWA 5\n\n**NIOSH REL (mg/m\u00b3):** 24\n\n> NIOSH REL TWA 5 ppm (24 mg/m3) [skin]\n\nSource: \n", "cas_number": "111-76-2", "file": "2-butoxyethanol-2.md", "generated": true, "harvested": "2026-09-08", "id": "2-butoxyethanol-2", "quote_cas_number": "CAS No. 111-76-2", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - 2-Butoxyethanol", "rel_mgm3": "24", "rel_ppm": "TWA 5", "source_quote": "NIOSH REL TWA 5 ppm (24 mg/m3) [skin]", "sources": ["https://www.cdc.gov/niosh/npg/npgd0070.html"], "stale_after": "2027-09-08", "substance": "2-Butoxyethanol", "title": "2-Butoxyethanol \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** 2-Butoxyethanol acetate\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - 2-Butoxyethanol acetate\n\n**CAS No.:** 112-07-2\n\n> CAS No. 112-07-2\n\n**NIOSH REL (ppm):** TWA 5\n\n**NIOSH REL (mg/m\u00b3):** 33\n\n> NIOSH REL TWA 5 ppm (33 mg/m3)\n\nSource: \n", "cas_number": "112-07-2", "file": "2-butoxyethanol-acetate.md", "generated": true, "harvested": "2026-09-08", "id": "2-butoxyethanol-acetate", "quote_cas_number": "CAS No. 112-07-2", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - 2-Butoxyethanol acetate", "rel_mgm3": "33", "rel_ppm": "TWA 5", "source_quote": "NIOSH REL TWA 5 ppm (33 mg/m3)", "sources": ["https://www.cdc.gov/niosh/npg/npgd0071.html"], "stale_after": "2027-09-08", "substance": "2-Butoxyethanol acetate", "title": "2-Butoxyethanol acetate \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** 2-Butoxyethanol (EGBE)\n\n**CAS No.:** 111762\n\n**PEL (ppm):** 20\n\n**PEL (mg/m\u00b3):** 97\n\n> 111762 | S | 2-Butoxyethanol (EGBE) | 20 | 97\n\nSource: \n", "cas_number": "111762", "file": "2-butoxyethanol-egbe.md", "generated": true, "harvested": "2026-08-05", "id": "2-butoxyethanol-egbe", "pel_mgm3": "97", "pel_ppm": "20", "source_quote": "111762 | S | 2-Butoxyethanol (EGBE) | 20 | 97", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "2-Butoxyethanol (EGBE)", "title": "2-Butoxyethanol (EGBE) \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** 2-Butoxyethanol\n\n**CAS No.:** 111-76-2\n\n**PEL (ppm):** 50\n\n**PEL (mg/m\u00b3):** 240\n\n> 2-Butoxyethanol | 111-76-2 | 50 | 240 | X |\n\nSource: \n", "cas_number": "111-76-2", "file": "2-butoxyethanol.md", "generated": true, "harvested": "2026-08-05", "id": "2-butoxyethanol", "pel_mgm3": "240", "pel_ppm": "50", "source_quote": "2-Butoxyethanol | 111-76-2 | 50 | 240 | X |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "2-Butoxyethanol", "title": "2-Butoxyethanol \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** 2-Chloro-1,3-butadiene; see Chloroprene\n\n**CAS No.:** 126998\n\n> 126998 | S | 2-Chloro-1,3-butadiene; see Chloroprene\n\nSource: \n", "cas_number": "126998", "file": "2-chloro-1-3-butadiene-see-chloroprene.md", "generated": true, "harvested": "2026-08-05", "id": "2-chloro-1-3-butadiene-see-chloroprene", "source_quote": "126998 | S | 2-Chloro-1,3-butadiene; see Chloroprene", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "2-Chloro-1,3-butadiene; see Chloroprene", "title": "2-Chloro-1,3-butadiene; see Chloroprene \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** 2-Chloro-6-trichloromethyl pyridine\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - 2-Chloro-6-trichloromethyl pyridine\n\n**CAS No.:** 1929-82-4\n\n> CAS No. 1929-82-4\n\n**NIOSH REL, as stated:** TWA 10 mg/m3 (total) ST 20 mg/m3 (total) TWA 5 mg/m3 (resp)\n\n> NIOSH REL TWA 10 mg/m3 (total) ST 20 mg/m3 (total) TWA 5 mg/m3 (resp)\n\nSource: \n", "cas_number": "1929-82-4", "file": "2-chloro-6-trichloromethyl-pyridine-2.md", "generated": true, "harvested": "2026-09-08", "id": "2-chloro-6-trichloromethyl-pyridine-2", "quote_cas_number": "CAS No. 1929-82-4", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - 2-Chloro-6-trichloromethyl pyridine", "rel_statement": "TWA 10 mg/m3 (total) ST 20 mg/m3 (total) TWA 5 mg/m3 (resp)", "source_quote": "NIOSH REL TWA 10 mg/m3 (total) ST 20 mg/m3 (total) TWA 5 mg/m3 (resp)", "sources": ["https://www.cdc.gov/niosh/npg/npgd0136.html"], "stale_after": "2027-09-08", "substance": "2-Chloro-6-trichloromethyl pyridine", "title": "2-Chloro-6-trichloromethyl pyridine \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** 2-Chloro-6-(trichloromethyl)pyridine; see Nitrapyrin\n\n**CAS No.:** 1929824\n\n> 1929824 | | 2-Chloro-6-(trichloromethyl)pyridine; see Nitrapyrin | --\n\nSource: \n", "cas_number": "1929824", "file": "2-chloro-6-trichloromethyl-pyridine-see-nitrapyrin.md", "generated": true, "harvested": "2026-08-05", "id": "2-chloro-6-trichloromethyl-pyridine-see-nitrapyrin", "source_quote": "1929824 | | 2-Chloro-6-(trichloromethyl)pyridine; see Nitrapyrin | --", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "2-Chloro-6-(trichloromethyl)pyridine; see Nitrapyrin", "title": "2-Chloro-6-(trichloromethyl)pyridine; see Nitrapyrin \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** 2-Chloro-6-(trichloromethyl) pyridine\n\n**CAS No.:** 1929-82-4\n\n> 2-Chloro-6-(trichloromethyl) pyridine | 1929-82-4 | - | - | - |\n\nSource: \n", "cas_number": "1929-82-4", "file": "2-chloro-6-trichloromethyl-pyridine.md", "generated": true, "harvested": "2026-08-05", "id": "2-chloro-6-trichloromethyl-pyridine", "source_quote": "2-Chloro-6-(trichloromethyl) pyridine | 1929-82-4 | - | - | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "2-Chloro-6-(trichloromethyl) pyridine", "title": "2-Chloro-6-(trichloromethyl) pyridine \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** 2-Chloroethanol; see Ethylene chlorohydrin\n\n**CAS No.:** 107073\n\n> 107073 | | 2-Chloroethanol; see Ethylene chlorohydrin\n\nSource: \n", "cas_number": "107073", "file": "2-chloroethanol-see-ethylene-chlorohydrin.md", "generated": true, "harvested": "2026-08-05", "id": "2-chloroethanol-see-ethylene-chlorohydrin", "source_quote": "107073 | | 2-Chloroethanol; see Ethylene chlorohydrin", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "2-Chloroethanol; see Ethylene chlorohydrin", "title": "2-Chloroethanol; see Ethylene chlorohydrin \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** 2-Chloropropionic acid\n\n**CAS No.:** 598787\n\n**PEL (ppm):** 0.1\n\n**PEL (mg/m\u00b3):** 0.44\n\n> 598787 | S | 2-Chloropropionic acid | 0.1 | 0.44\n\nSource: \n", "cas_number": "598787", "file": "2-chloropropionic-acid.md", "generated": true, "harvested": "2026-08-05", "id": "2-chloropropionic-acid", "pel_mgm3": "0.44", "pel_ppm": "0.1", "source_quote": "598787 | S | 2-Chloropropionic acid | 0.1 | 0.44", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "2-Chloropropionic acid", "title": "2-Chloropropionic acid \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** 2-(Diethylamino) ethanol\n\n**CAS No.:** 100378\n\n**PEL (ppm):** 2\n\n**PEL (mg/m\u00b3):** 9.6\n\n> 100378 | S | 2-(Diethylamino) ethanol | 2 | 9.6\n\nSource: \n", "cas_number": "100378", "file": "2-diethylamino-ethanol.md", "generated": true, "harvested": "2026-08-05", "id": "2-diethylamino-ethanol", "pel_mgm3": "9.6", "pel_ppm": "2", "source_quote": "100378 | S | 2-(Diethylamino) ethanol | 2 | 9.6", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "2-(Diethylamino) ethanol", "title": "2-(Diethylamino) ethanol \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** 2-Diethylaminoethanol\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - 2-Diethylaminoethanol\n\n**CAS No.:** 100-37-8\n\n> CAS No. 100-37-8\n\n**NIOSH REL (ppm):** TWA 10\n\n**NIOSH REL (mg/m\u00b3):** 50\n\n> NIOSH REL TWA 10 ppm (50 mg/m3) [skin]\n\nSource: \n", "cas_number": "100-37-8", "file": "2-diethylaminoethanol-2.md", "generated": true, "harvested": "2026-09-08", "id": "2-diethylaminoethanol-2", "quote_cas_number": "CAS No. 100-37-8", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - 2-Diethylaminoethanol", "rel_mgm3": "50", "rel_ppm": "TWA 10", "source_quote": "NIOSH REL TWA 10 ppm (50 mg/m3) [skin]", "sources": ["https://www.cdc.gov/niosh/npg/npgd0210.html"], "stale_after": "2027-09-08", "substance": "2-Diethylaminoethanol", "title": "2-Diethylaminoethanol \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** 2-Diethylaminoethanol\n\n**CAS No.:** 100-37-8\n\n**PEL (ppm):** 10\n\n**PEL (mg/m\u00b3):** 50\n\n> 2-Diethylaminoethanol | 100-37-8 | 10 | 50 | X |\n\nSource: \n", "cas_number": "100-37-8", "file": "2-diethylaminoethanol.md", "generated": true, "harvested": "2026-08-05", "id": "2-diethylaminoethanol", "pel_mgm3": "50", "pel_ppm": "10", "source_quote": "2-Diethylaminoethanol | 100-37-8 | 10 | 50 | X |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "2-Diethylaminoethanol", "title": "2-Diethylaminoethanol \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** 2-Ethoxyethanol\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - 2-Ethoxyethanol\n\n**CAS No.:** 110-80-5\n\n> CAS No. 110-80-5\n\n**NIOSH REL (ppm):** TWA 0.5\n\n**NIOSH REL (mg/m\u00b3):** 1.8\n\n> NIOSH REL TWA 0.5 ppm (1.8 mg/m3) [skin]\n\nSource: \n", "cas_number": "110-80-5", "file": "2-ethoxyethanol-2.md", "generated": true, "harvested": "2026-09-08", "id": "2-ethoxyethanol-2", "quote_cas_number": "CAS No. 110-80-5", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - 2-Ethoxyethanol", "rel_mgm3": "1.8", "rel_ppm": "TWA 0.5", "source_quote": "NIOSH REL TWA 0.5 ppm (1.8 mg/m3) [skin]", "sources": ["https://www.cdc.gov/niosh/npg/npgd0258.html"], "stale_after": "2027-09-08", "substance": "2-Ethoxyethanol", "title": "2-Ethoxyethanol \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** 2-Ethoxyethanol (Cellosolve)\n\n**CAS No.:** 110-80-5\n\n**PEL (ppm):** 200\n\n**PEL (mg/m\u00b3):** 740\n\n> 2-Ethoxyethanol (Cellosolve) | 110-80-5 | 200 | 740 | X |\n\nSource: \n", "cas_number": "110-80-5", "file": "2-ethoxyethanol-cellosolve.md", "generated": true, "harvested": "2026-08-05", "id": "2-ethoxyethanol-cellosolve", "pel_mgm3": "740", "pel_ppm": "200", "source_quote": "2-Ethoxyethanol (Cellosolve) | 110-80-5 | 200 | 740 | X |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "2-Ethoxyethanol (Cellosolve)", "title": "2-Ethoxyethanol (Cellosolve) \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** 2-Ethoxyethanol\n\n**CAS No.:** 110805\n\n**PEL (ppm):** 5\n\n**PEL (mg/m\u00b3):** 18\n\n> 110805 | S | 2-Ethoxyethanol | 5 | 18\n\nSource: \n", "cas_number": "110805", "file": "2-ethoxyethanol.md", "generated": true, "harvested": "2026-08-05", "id": "2-ethoxyethanol", "pel_mgm3": "18", "pel_ppm": "5", "source_quote": "110805 | S | 2-Ethoxyethanol | 5 | 18", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "2-Ethoxyethanol", "title": "2-Ethoxyethanol \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** 2-Ethoxyethyl acetate\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - 2-Ethoxyethyl acetate\n\n**CAS No.:** 111-15-9\n\n> CAS No. 111-15-9\n\n**NIOSH REL (ppm):** TWA 0.5\n\n**NIOSH REL (mg/m\u00b3):** 2.7\n\n> NIOSH REL TWA 0.5 ppm (2.7 mg/m3) [skin]\n\nSource: \n", "cas_number": "111-15-9", "file": "2-ethoxyethyl-acetate-2.md", "generated": true, "harvested": "2026-09-08", "id": "2-ethoxyethyl-acetate-2", "quote_cas_number": "CAS No. 111-15-9", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - 2-Ethoxyethyl acetate", "rel_mgm3": "2.7", "rel_ppm": "TWA 0.5", "source_quote": "NIOSH REL TWA 0.5 ppm (2.7 mg/m3) [skin]", "sources": ["https://www.cdc.gov/niosh/npg/npgd0259.html"], "stale_after": "2027-09-08", "substance": "2-Ethoxyethyl acetate", "title": "2-Ethoxyethyl acetate \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** 2-Ethoxyethyl acetate (Cellosolve acetate)\n\n**CAS No.:** 111-15-9\n\n**PEL (ppm):** 100\n\n**PEL (mg/m\u00b3):** 540\n\n> 2-Ethoxyethyl acetate (Cellosolve acetate) | 111-15-9 | 100 | 540 | X |\n\nSource: \n", "cas_number": "111-15-9", "file": "2-ethoxyethyl-acetate-cellosolve-acetate.md", "generated": true, "harvested": "2026-08-05", "id": "2-ethoxyethyl-acetate-cellosolve-acetate", "pel_mgm3": "540", "pel_ppm": "100", "source_quote": "2-Ethoxyethyl acetate (Cellosolve acetate) | 111-15-9 | 100 | 540 | X |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "2-Ethoxyethyl acetate (Cellosolve acetate)", "title": "2-Ethoxyethyl acetate (Cellosolve acetate) \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** 2-Ethoxyethyl acetate\n\n**CAS No.:** 111159\n\n**PEL (ppm):** 5\n\n**PEL (mg/m\u00b3):** 27\n\n> 111159 | S | 2-Ethoxyethyl acetate | 5 | 27\n\nSource: \n", "cas_number": "111159", "file": "2-ethoxyethyl-acetate.md", "generated": true, "harvested": "2026-08-05", "id": "2-ethoxyethyl-acetate", "pel_mgm3": "27", "pel_ppm": "5", "source_quote": "111159 | S | 2-Ethoxyethyl acetate | 5 | 27", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "2-Ethoxyethyl acetate", "title": "2-Ethoxyethyl acetate \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** 2-Hexanone (Methyl n-butyl ketone)\n\n**CAS No.:** 591-78-6\n\n**PEL (ppm):** 100\n\n**PEL (mg/m\u00b3):** 410\n\n> 2-Hexanone (Methyl n-butyl ketone) | 591-78-6 | 100 | 410 | - |\n\nSource: \n", "cas_number": "591-78-6", "file": "2-hexanone-methyl-n-butyl-ketone.md", "generated": true, "harvested": "2026-08-05", "id": "2-hexanone-methyl-n-butyl-ketone", "pel_mgm3": "410", "pel_ppm": "100", "source_quote": "2-Hexanone (Methyl n-butyl ketone) | 591-78-6 | 100 | 410 | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "2-Hexanone (Methyl n-butyl ketone)", "title": "2-Hexanone (Methyl n-butyl ketone) \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** 2-Hexanone; see Methyl butyl ketone\n\n**CAS No.:** 591786\n\n> 591786 | | 2-Hexanone; see Methyl butyl ketone\n\nSource: \n", "cas_number": "591786", "file": "2-hexanone-see-methyl-butyl-ketone.md", "generated": true, "harvested": "2026-08-05", "id": "2-hexanone-see-methyl-butyl-ketone", "source_quote": "591786 | | 2-Hexanone; see Methyl butyl ketone", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "2-Hexanone; see Methyl butyl ketone", "title": "2-Hexanone; see Methyl butyl ketone \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** 2-Hexanone\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - 2-Hexanone\n\n**CAS No.:** 591-78-6\n\n> CAS No. 591-78-6\n\n**NIOSH REL (ppm):** TWA 1\n\n**NIOSH REL (mg/m\u00b3):** 4\n\n> NIOSH REL TWA 1 ppm (4 mg/m3)\n\nSource: \n", "cas_number": "591-78-6", "file": "2-hexanone.md", "generated": true, "harvested": "2026-09-08", "id": "2-hexanone", "quote_cas_number": "CAS No. 591-78-6", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - 2-Hexanone", "rel_mgm3": "4", "rel_ppm": "TWA 1", "source_quote": "NIOSH REL TWA 1 ppm (4 mg/m3)", "sources": ["https://www.cdc.gov/niosh/npg/npgd0325.html"], "stale_after": "2027-09-08", "substance": "2-Hexanone", "title": "2-Hexanone \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** 2-Hydroxypropyl acrylate\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - 2-Hydroxypropyl acrylate\n\n**CAS No.:** 999-61-1\n\n> CAS No. 999-61-1\n\n**NIOSH REL (ppm):** TWA 0.5\n\n**NIOSH REL (mg/m\u00b3):** 3\n\n> NIOSH REL TWA 0.5 ppm (3 mg/m3) [skin]\n\nSource: \n", "cas_number": "999-61-1", "file": "2-hydroxypropyl-acrylate-2.md", "generated": true, "harvested": "2026-09-08", "id": "2-hydroxypropyl-acrylate-2", "quote_cas_number": "CAS No. 999-61-1", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - 2-Hydroxypropyl acrylate", "rel_mgm3": "3", "rel_ppm": "TWA 0.5", "source_quote": "NIOSH REL TWA 0.5 ppm (3 mg/m3) [skin]", "sources": ["https://www.cdc.gov/niosh/npg/npgd0339.html"], "stale_after": "2027-09-08", "substance": "2-Hydroxypropyl acrylate", "title": "2-Hydroxypropyl acrylate \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** 2-Hydroxypropyl acrylate\n\n**CAS No.:** 999611\n\n**PEL (ppm):** 0.5\n\n**PEL (mg/m\u00b3):** 3\n\n> 999611 | S | 2-Hydroxypropyl acrylate | 0.5 | 3\n\nSource: \n", "cas_number": "999611", "file": "2-hydroxypropyl-acrylate.md", "generated": true, "harvested": "2026-08-05", "id": "2-hydroxypropyl-acrylate", "pel_mgm3": "3", "pel_ppm": "0.5", "source_quote": "999611 | S | 2-Hydroxypropyl acrylate | 0.5 | 3", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "2-Hydroxypropyl acrylate", "title": "2-Hydroxypropyl acrylate \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** 2-Isopropoxyethanol\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - 2-Isopropoxyethanol\n\n**CAS No.:** 109-59-1\n\n> CAS No. 109-59-1\n\n**NIOSH REL, as stated:** See Appendix D\n\n> NIOSH REL See Appendix D\n\nSource: \n", "cas_number": "109-59-1", "file": "2-isopropoxyethanol.md", "generated": true, "harvested": "2026-09-08", "id": "2-isopropoxyethanol", "quote_cas_number": "CAS No. 109-59-1", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - 2-Isopropoxyethanol", "rel_statement": "See Appendix D", "source_quote": "NIOSH REL See Appendix D", "sources": ["https://www.cdc.gov/niosh/npg/npgd0357.html"], "stale_after": "2027-09-08", "substance": "2-Isopropoxyethanol", "title": "2-Isopropoxyethanol \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** 2-Methoxyethanol (Methyl cellosolve)\n\n**CAS No.:** 109-86-4\n\n**PEL (ppm):** 25\n\n**PEL (mg/m\u00b3):** 80\n\n> 2-Methoxyethanol (Methyl cellosolve) | 109-86-4 | 25 | 80 | X |\n\nSource: \n", "cas_number": "109-86-4", "file": "2-methoxyethanol-methyl-cellosolve.md", "generated": true, "harvested": "2026-08-05", "id": "2-methoxyethanol-methyl-cellosolve", "pel_mgm3": "80", "pel_ppm": "25", "source_quote": "2-Methoxyethanol (Methyl cellosolve) | 109-86-4 | 25 | 80 | X |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "2-Methoxyethanol (Methyl cellosolve)", "title": "2-Methoxyethanol (Methyl cellosolve) \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** 2-Methoxyethanol\n\n**CAS No.:** 109864\n\n**PEL (ppm):** 5\n\n**PEL (mg/m\u00b3):** 16\n\n> 109864 | S | 2-Methoxyethanol | 5 | 16\n\nSource: \n", "cas_number": "109864", "file": "2-methoxyethanol.md", "generated": true, "harvested": "2026-08-05", "id": "2-methoxyethanol", "pel_mgm3": "16", "pel_ppm": "5", "source_quote": "109864 | S | 2-Methoxyethanol | 5 | 16", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "2-Methoxyethanol", "title": "2-Methoxyethanol \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** 2-Methoxyethyl acetate (Methyl cellosolve acetate)\n\n**CAS No.:** 110-49-6\n\n**PEL (ppm):** 25\n\n**PEL (mg/m\u00b3):** 120\n\n> 2-Methoxyethyl acetate (Methyl cellosolve acetate) | 110-49-6 | 25 | 120 | X |\n\nSource: \n", "cas_number": "110-49-6", "file": "2-methoxyethyl-acetate-methyl-cellosolve-acetate.md", "generated": true, "harvested": "2026-08-05", "id": "2-methoxyethyl-acetate-methyl-cellosolve-acetate", "pel_mgm3": "120", "pel_ppm": "25", "source_quote": "2-Methoxyethyl acetate (Methyl cellosolve acetate) | 110-49-6 | 25 | 120 | X |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "2-Methoxyethyl acetate (Methyl cellosolve acetate)", "title": "2-Methoxyethyl acetate (Methyl cellosolve acetate) \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** 2-Methoxyethyl acetate\n\n**CAS No.:** 110496\n\n**PEL (ppm):** 5\n\n**PEL (mg/m\u00b3):** 24\n\n> 110496 | | 2-Methoxyethyl acetate | 5 | 24\n\nSource: \n", "cas_number": "110496", "file": "2-methoxyethyl-acetate.md", "generated": true, "harvested": "2026-08-05", "id": "2-methoxyethyl-acetate", "pel_mgm3": "24", "pel_ppm": "5", "source_quote": "110496 | | 2-Methoxyethyl acetate | 5 | 24", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "2-Methoxyethyl acetate", "title": "2-Methoxyethyl acetate \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** 2-Methylbutyl acetate; see Pentyl acetate\n\n**CAS No.:** 624419\n\n> 624419 | | 2-Methylbutyl acetate; see Pentyl acetate\n\nSource: \n", "cas_number": "624419", "file": "2-methylbutyl-acetate-see-pentyl-acetate.md", "generated": true, "harvested": "2026-08-05", "id": "2-methylbutyl-acetate-see-pentyl-acetate", "source_quote": "624419 | | 2-Methylbutyl acetate; see Pentyl acetate", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "2-Methylbutyl acetate; see Pentyl acetate", "title": "2-Methylbutyl acetate; see Pentyl acetate \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** 2-Methylcyclopentadienyl manganese tricarbonyl, as Mn\n\n**CAS No.:** 12108133\n\n**PEL (mg/m\u00b3):** 0.2\n\n> 12108133 | S | 2-Methylcyclopentadienyl manganese tricarbonyl, as Mn | -- | 0.2\n\nSource: \n", "cas_number": "12108133", "file": "2-methylcyclopentadienyl-manganese-tricarbonyl-as-mn.md", "generated": true, "harvested": "2026-08-05", "id": "2-methylcyclopentadienyl-manganese-tricarbonyl-as-mn", "pel_mgm3": "0.2", "source_quote": "12108133 | S | 2-Methylcyclopentadienyl manganese tricarbonyl, as Mn | -- | 0.2", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "2-Methylcyclopentadienyl manganese tricarbonyl, as Mn", "title": "2-Methylcyclopentadienyl manganese tricarbonyl, as Mn \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** 2-N-Dibutylaminoethanol\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - 2-N-Dibutylaminoethanol\n\n**CAS No.:** 102-81-8\n\n> CAS No. 102-81-8\n\n**NIOSH REL (ppm):** TWA 2\n\n**NIOSH REL (mg/m\u00b3):** 14\n\n> NIOSH REL TWA 2 ppm (14 mg/m3) [skin]\n\nSource: \n", "cas_number": "102-81-8", "file": "2-n-dibutylaminoethanol-2.md", "generated": true, "harvested": "2026-09-08", "id": "2-n-dibutylaminoethanol-2", "quote_cas_number": "CAS No. 102-81-8", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - 2-N-Dibutylaminoethanol", "rel_mgm3": "14", "rel_ppm": "TWA 2", "source_quote": "NIOSH REL TWA 2 ppm (14 mg/m3) [skin]", "sources": ["https://www.cdc.gov/niosh/npg/npgd0185.html"], "stale_after": "2027-09-08", "substance": "2-N-Dibutylaminoethanol", "title": "2-N-Dibutylaminoethanol \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** 2-N-Dibutylaminoethanol\n\n**CAS No.:** 102818\n\n**PEL (ppm):** 2\n\n**PEL (mg/m\u00b3):** 14\n\n> 102818 | S | 2-N-Dibutylaminoethanol | 2 | 14\n\nSource: \n", "cas_number": "102818", "file": "2-n-dibutylaminoethanol.md", "generated": true, "harvested": "2026-08-05", "id": "2-n-dibutylaminoethanol", "pel_mgm3": "14", "pel_ppm": "2", "source_quote": "102818 | S | 2-N-Dibutylaminoethanol | 2 | 14", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "2-N-Dibutylaminoethanol", "title": "2-N-Dibutylaminoethanol \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** 2-Nitronaphthalene\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - 2-Nitronaphthalene\n\n**CAS No.:** 581-89-5\n\n> CAS No. 581-89-5\n\n**NIOSH REL, as stated:** Ca* See Appendix A\n\n> NIOSH REL Ca* See Appendix A\n\nSource: \n", "cas_number": "581-89-5", "file": "2-nitronaphthalene.md", "generated": true, "harvested": "2026-09-08", "id": "2-nitronaphthalene", "quote_cas_number": "CAS No. 581-89-5", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - 2-Nitronaphthalene", "rel_statement": "Ca* See Appendix A", "source_quote": "NIOSH REL Ca* See Appendix A", "sources": ["https://www.cdc.gov/niosh/npg/npgd0458.html"], "stale_after": "2027-09-08", "substance": "2-Nitronaphthalene", "title": "2-Nitronaphthalene \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** 2-Nitropropane\n\n**CAS No.:** 79469\n\n**PEL (ppm):** 10\n\n**PEL (mg/m\u00b3):** 35\n\n> 79469 | | 2-Nitropropane | 10 | 35\n\nSource: \n", "cas_number": "79469", "file": "2-nitropropane-2.md", "generated": true, "harvested": "2026-08-05", "id": "2-nitropropane-2", "pel_mgm3": "35", "pel_ppm": "10", "source_quote": "79469 | | 2-Nitropropane | 10 | 35", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "2-Nitropropane", "title": "2-Nitropropane \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** 2-Nitropropane\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - 2-Nitropropane\n\n**CAS No.:** 79-46-9\n\n> CAS No. 79-46-9\n\n**NIOSH REL, as stated:** Ca See Appendix A\n\n> NIOSH REL Ca See Appendix A\n\nSource: \n", "cas_number": "79-46-9", "file": "2-nitropropane-3.md", "generated": true, "harvested": "2026-09-08", "id": "2-nitropropane-3", "quote_cas_number": "CAS No. 79-46-9", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - 2-Nitropropane", "rel_statement": "Ca See Appendix A", "source_quote": "NIOSH REL Ca See Appendix A", "sources": ["https://www.cdc.gov/niosh/npg/npgd0460.html"], "stale_after": "2027-09-08", "substance": "2-Nitropropane", "title": "2-Nitropropane \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** 2-Nitropropane\n\n**CAS No.:** 79-46-9\n\n**PEL (ppm):** 25\n\n**PEL (mg/m\u00b3):** 90\n\n> 2-Nitropropane | 79-46-9 | 25 | 90 | - |\n\nSource: \n", "cas_number": "79-46-9", "file": "2-nitropropane.md", "generated": true, "harvested": "2026-08-05", "id": "2-nitropropane", "pel_mgm3": "90", "pel_ppm": "25", "source_quote": "2-Nitropropane | 79-46-9 | 25 | 90 | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "2-Nitropropane", "title": "2-Nitropropane \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** 2-Pentanone (Methyl propyl ketone)\n\n**CAS No.:** 107-87-9\n\n**PEL (ppm):** 200\n\n**PEL (mg/m\u00b3):** 700\n\n> 2-Pentanone (Methyl propyl ketone) | 107-87-9 | 200 | 700 | - |\n\nSource: \n", "cas_number": "107-87-9", "file": "2-pentanone-methyl-propyl-ketone.md", "generated": true, "harvested": "2026-08-05", "id": "2-pentanone-methyl-propyl-ketone", "pel_mgm3": "700", "pel_ppm": "200", "source_quote": "2-Pentanone (Methyl propyl ketone) | 107-87-9 | 200 | 700 | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "2-Pentanone (Methyl propyl ketone)", "title": "2-Pentanone (Methyl propyl ketone) \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** 2-Pentanone; see Methyl propyl ketone\n\n**CAS No.:** 107879\n\n> 107879 | | 2-Pentanone; see Methyl propyl ketone\n\nSource: \n", "cas_number": "107879", "file": "2-pentanone-see-methyl-propyl-ketone.md", "generated": true, "harvested": "2026-08-05", "id": "2-pentanone-see-methyl-propyl-ketone", "source_quote": "107879 | | 2-Pentanone; see Methyl propyl ketone", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "2-Pentanone; see Methyl propyl ketone", "title": "2-Pentanone; see Methyl propyl ketone \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** 2-Pentanone\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - 2-Pentanone\n\n**CAS No.:** 107-87-9\n\n> CAS No. 107-87-9\n\n**NIOSH REL (ppm):** TWA 150\n\n**NIOSH REL (mg/m\u00b3):** 530\n\n> NIOSH REL TWA 150 ppm (530 mg/m3)\n\nSource: \n", "cas_number": "107-87-9", "file": "2-pentanone.md", "generated": true, "harvested": "2026-09-08", "id": "2-pentanone", "quote_cas_number": "CAS No. 107-87-9", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - 2-Pentanone", "rel_mgm3": "530", "rel_ppm": "TWA 150", "source_quote": "NIOSH REL TWA 150 ppm (530 mg/m3)", "sources": ["https://www.cdc.gov/niosh/npg/npgd0488.html"], "stale_after": "2027-09-08", "substance": "2-Pentanone", "title": "2-Pentanone \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** 3,3'-Dichlorobenzidine; 4,4'-diamino-3,3'-dichlorobiphenyl; see Section 5209\n\n**CAS No.:** 91941\n\n> 91941 | S | 3,3'-Dichlorobenzidine; 4,4'-diamino-3,3'-dichlorobiphenyl; see Section 5209\n\nSource: \n", "cas_number": "91941", "file": "3-3-dichlorobenzidine-4-4-diamino-3-3-dichlorobiphenyl-see-section-5209.md", "generated": true, "harvested": "2026-08-05", "id": "3-3-dichlorobenzidine-4-4-diamino-3-3-dichlorobiphenyl-see-section-5209", "source_quote": "91941 | S | 3,3'-Dichlorobenzidine; 4,4'-diamino-3,3'-dichlorobiphenyl; see Section 5209", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "3,3'-Dichlorobenzidine; 4,4'-diamino-3,3'-dichlorobiphenyl; see Section 5209", "title": "3,3'-Dichlorobenzidine; 4,4'-diamino-3,3'-dichlorobiphenyl; see Section 5209 \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** 3,3'-Dichlorobenzidine (and its salts)\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - 3,3'-Dichlorobenzidine (and its salts)\n\n**CAS No.:** 91-94-1\n\n> CAS No. 91-94-1\n\n**NIOSH REL, as stated:** Ca See Appendix A\n\n> NIOSH REL Ca See Appendix A\n\nSource: \n", "cas_number": "91-94-1", "file": "3-3-dichlorobenzidine-and-its-salts.md", "generated": true, "harvested": "2026-09-08", "id": "3-3-dichlorobenzidine-and-its-salts", "quote_cas_number": "CAS No. 91-94-1", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - 3,3'-Dichlorobenzidine (and its salts)", "rel_statement": "Ca See Appendix A", "source_quote": "NIOSH REL Ca See Appendix A", "sources": ["https://www.cdc.gov/niosh/npg/npgd0191.html"], "stale_after": "2027-09-08", "substance": "3,3'-Dichlorobenzidine (and its salts)", "title": "3,3'-Dichlorobenzidine (and its salts) \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** 3-Amyl acetate; see Pentyl acetate\n\n**CAS No.:** 620111\n\n> 620111 | | 3-Amyl acetate; see Pentyl acetate\n\nSource: \n", "cas_number": "620111", "file": "3-amyl-acetate-see-pentyl-acetate.md", "generated": true, "harvested": "2026-08-05", "id": "3-amyl-acetate-see-pentyl-acetate", "source_quote": "620111 | | 3-Amyl acetate; see Pentyl acetate", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "3-Amyl acetate; see Pentyl acetate", "title": "3-Amyl acetate; see Pentyl acetate \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** 3,\u2032-Dichlorobenzidine; see 1910.1007\n\n**CAS No.:** 91-94-1\n\n> 3,\u2032-Dichlorobenzidine; see 1910.1007 | 91-94-1 | - | - | - |\n\nSource: \n", "cas_number": "91-94-1", "file": "3-dichlorobenzidine-see-1910-1007.md", "generated": true, "harvested": "2026-08-05", "id": "3-dichlorobenzidine-see-1910-1007", "source_quote": "3,\u2032-Dichlorobenzidine; see 1910.1007 | 91-94-1 | - | - | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "3,\u2032-Dichlorobenzidine; see 1910.1007", "title": "3,\u2032-Dichlorobenzidine; see 1910.1007 \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** 4,4\u2032-Methylene bis(2-chloroaniline), see also Section 5215\n\n**CAS No.:** 101144\n\n**PEL (mg/m\u00b3):** 0.01\n\n> 101144 | S | 4,4\u2032-Methylene bis(2-chloroaniline), see also Section 5215 | -- | 0.01\n\nSource: \n", "cas_number": "101144", "file": "4-4-methylene-bis-2-chloroaniline-see-also-section-5215.md", "generated": true, "harvested": "2026-08-05", "id": "4-4-methylene-bis-2-chloroaniline-see-also-section-5215", "pel_mgm3": "0.01", "source_quote": "101144 | S | 4,4\u2032-Methylene bis(2-chloroaniline), see also Section 5215 | -- | 0.01", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "4,4\u2032-Methylene bis(2-chloroaniline), see also Section 5215", "title": "4,4\u2032-Methylene bis(2-chloroaniline), see also Section 5215 \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** 4,4\u2032-Methylene dianiline; MDA (see also Sections 1535 & 5200)\n\n**CAS No.:** 101779\n\n**PEL (ppm):** 0.01\n\n**PEL (mg/m\u00b3):** 0.08\n\n**STEL (ppm):** 0.1\n\n**STEL (mg/m\u00b3):** 0.8\n\n> 101779 | S | 4,4\u2032-Methylene dianiline; MDA (see also Sections 1535 & 5200) | 0.01 | 0.08 | | 0.1 | 0.8\n\nSource: \n", "cas_number": "101779", "file": "4-4-methylene-dianiline-mda-see-also-sections-1535-5200.md", "generated": true, "harvested": "2026-08-05", "id": "4-4-methylene-dianiline-mda-see-also-sections-1535-5200", "pel_mgm3": "0.08", "pel_ppm": "0.01", "source_quote": "101779 | S | 4,4\u2032-Methylene dianiline; MDA (see also Sections 1535 & 5200) | 0.01 | 0.08 | | 0.1 | 0.8", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "stel_mgm3": "0.8", "stel_ppm": "0.1", "substance": "4,4\u2032-Methylene dianiline; MDA (see also Sections 1535 & 5200)", "title": "4,4\u2032-Methylene dianiline; MDA (see also Sections 1535 & 5200) \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** 4,4'-Methylenebis(2-chloroaniline)\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - 4,4'-Methylenebis(2-chloroaniline)\n\n**CAS No.:** 101-14-4\n\n> CAS No. 101-14-4\n\n**NIOSH REL (mg/m\u00b3):** TWA 0.003\n\n> NIOSH REL Ca TWA 0.003 mg/m3 [skin]\n\nSource: \n", "cas_number": "101-14-4", "file": "4-4-methylenebis-2-chloroaniline.md", "generated": true, "harvested": "2026-09-08", "id": "4-4-methylenebis-2-chloroaniline", "quote_cas_number": "CAS No. 101-14-4", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - 4,4'-Methylenebis(2-chloroaniline)", "rel_mgm3": "TWA 0.003", "source_quote": "NIOSH REL Ca TWA 0.003 mg/m3 [skin]", "sources": ["https://www.cdc.gov/niosh/npg/npgd0411.html"], "stale_after": "2027-09-08", "substance": "4,4'-Methylenebis(2-chloroaniline)", "title": "4,4'-Methylenebis(2-chloroaniline) \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** 4,4'-Methylenedianiline\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - 4,4'-Methylenedianiline\n\n**CAS No.:** 101-77-9\n\n> CAS No. 101-77-9\n\n**NIOSH REL, as stated:** Ca See Appendix A\n\n> NIOSH REL Ca See Appendix A\n\nSource: \n", "cas_number": "101-77-9", "file": "4-4-methylenedianiline.md", "generated": true, "harvested": "2026-09-08", "id": "4-4-methylenedianiline", "quote_cas_number": "CAS No. 101-77-9", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - 4,4'-Methylenedianiline", "rel_statement": "Ca See Appendix A", "source_quote": "NIOSH REL Ca See Appendix A", "sources": ["https://www.cdc.gov/niosh/npg/npgd0415.html"], "stale_after": "2027-09-08", "substance": "4,4'-Methylenedianiline", "title": "4,4'-Methylenedianiline \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** 4,4\u2032-Thiobis(6-tert-butyl-m-cresol\n\n**CAS No.:** 96695\n\n> 96695 | | 4,4\u2032-Thiobis(6-tert-butyl-m-cresol | --\n\nSource: \n", "cas_number": "96695", "file": "4-4-thiobis-6-tert-butyl-m-cresol-2.md", "generated": true, "harvested": "2026-08-05", "id": "4-4-thiobis-6-tert-butyl-m-cresol-2", "source_quote": "96695 | | 4,4\u2032-Thiobis(6-tert-butyl-m-cresol | --", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "4,4\u2032-Thiobis(6-tert-butyl-m-cresol", "title": "4,4\u2032-Thiobis(6-tert-butyl-m-cresol \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** 4,4'-Thiobis(6-tert-butyl-m-cresol)\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - 4,4'-Thiobis(6-tert-butyl-m-cresol)\n\n**CAS No.:** 96-69-5\n\n> CAS No. 96-69-5\n\n**NIOSH REL, as stated:** TWA 10 mg/m3 (total) TWA 5 mg/m3 (resp)\n\n> NIOSH REL TWA 10 mg/m3 (total) TWA 5 mg/m3 (resp)\n\nSource: \n", "cas_number": "96-69-5", "file": "4-4-thiobis-6-tert-butyl-m-cresol-3.md", "generated": true, "harvested": "2026-09-08", "id": "4-4-thiobis-6-tert-butyl-m-cresol-3", "quote_cas_number": "CAS No. 96-69-5", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - 4,4'-Thiobis(6-tert-butyl-m-cresol)", "rel_statement": "TWA 10 mg/m3 (total) TWA 5 mg/m3 (resp)", "source_quote": "NIOSH REL TWA 10 mg/m3 (total) TWA 5 mg/m3 (resp)", "sources": ["https://www.cdc.gov/niosh/npg/npgd0609.html"], "stale_after": "2027-09-08", "substance": "4,4'-Thiobis(6-tert-butyl-m-cresol)", "title": "4,4'-Thiobis(6-tert-butyl-m-cresol) \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** 4,4\u2032-Thiobis (6-tert, Butyl-m-cresol)\n\n**CAS No.:** 96-69-5\n\n> 4,4\u2032-Thiobis (6-tert, Butyl-m-cresol) | 96-69-5 | - | - | - |\n\nSource: \n", "cas_number": "96-69-5", "file": "4-4-thiobis-6-tert-butyl-m-cresol.md", "generated": true, "harvested": "2026-08-05", "id": "4-4-thiobis-6-tert-butyl-m-cresol", "source_quote": "4,4\u2032-Thiobis (6-tert, Butyl-m-cresol) | 96-69-5 | - | - | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "4,4\u2032-Thiobis (6-tert, Butyl-m-cresol)", "title": "4,4\u2032-Thiobis (6-tert, Butyl-m-cresol) \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** 4,6-Dinitro-o-cresol; 2-methyl-4,6-dinitrophenol\n\n**CAS No.:** 534521\n\n**PEL (mg/m\u00b3):** 0.2\n\n> 534521 | S | 4,6-Dinitro-o-cresol; 2-methyl-4,6-dinitrophenol | -- | 0.2\n\nSource: \n", "cas_number": "534521", "file": "4-6-dinitro-o-cresol-2-methyl-4-6-dinitrophenol.md", "generated": true, "harvested": "2026-08-05", "id": "4-6-dinitro-o-cresol-2-methyl-4-6-dinitrophenol", "pel_mgm3": "0.2", "source_quote": "534521 | S | 4,6-Dinitro-o-cresol; 2-methyl-4,6-dinitrophenol | -- | 0.2", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "4,6-Dinitro-o-cresol; 2-methyl-4,6-dinitrophenol", "title": "4,6-Dinitro-o-cresol; 2-methyl-4,6-dinitrophenol \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** 4-Aminodiphenyl; see 1910.1011\n\n**CAS No.:** 92-67-1\n\n> 4-Aminodiphenyl; see 1910.1011 | 92-67-1 | - | - | - |\n\nSource: \n", "cas_number": "92-67-1", "file": "4-aminodiphenyl-see-1910-1011.md", "generated": true, "harvested": "2026-08-05", "id": "4-aminodiphenyl-see-1910-1011", "source_quote": "4-Aminodiphenyl; see 1910.1011 | 92-67-1 | - | - | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "4-Aminodiphenyl; see 1910.1011", "title": "4-Aminodiphenyl; see 1910.1011 \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** 4-Aminodiphenyl; see Section 5209\n\n**CAS No.:** 92671\n\n> 92671 | S | 4-Aminodiphenyl; see Section 5209\n\nSource: \n", "cas_number": "92671", "file": "4-aminodiphenyl-see-section-5209.md", "generated": true, "harvested": "2026-08-05", "id": "4-aminodiphenyl-see-section-5209", "source_quote": "92671 | S | 4-Aminodiphenyl; see Section 5209", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "4-Aminodiphenyl; see Section 5209", "title": "4-Aminodiphenyl; see Section 5209 \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** 4-Aminodiphenyl\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - 4-Aminodiphenyl\n\n**CAS No.:** 92-67-1\n\n> CAS No. 92-67-1\n\n**NIOSH REL, as stated:** Ca See Appendix A\n\n> NIOSH REL Ca See Appendix A\n\nSource: \n", "cas_number": "92-67-1", "file": "4-aminodiphenyl.md", "generated": true, "harvested": "2026-09-08", "id": "4-aminodiphenyl", "quote_cas_number": "CAS No. 92-67-1", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - 4-Aminodiphenyl", "rel_statement": "Ca See Appendix A", "source_quote": "NIOSH REL Ca See Appendix A", "sources": ["https://www.cdc.gov/niosh/npg/npgd0025.html"], "stale_after": "2027-09-08", "substance": "4-Aminodiphenyl", "title": "4-Aminodiphenyl \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** 4-Dimethylaminoazobenzene; see 1910.1015\n\n**CAS No.:** 60-11-7\n\n> 4-Dimethylaminoazobenzene; see 1910.1015 | 60-11-7 | - | - | - |\n\nSource: \n", "cas_number": "60-11-7", "file": "4-dimethylaminoazobenzene-see-1910-1015.md", "generated": true, "harvested": "2026-08-05", "id": "4-dimethylaminoazobenzene-see-1910-1015", "source_quote": "4-Dimethylaminoazobenzene; see 1910.1015 | 60-11-7 | - | - | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "4-Dimethylaminoazobenzene; see 1910.1015", "title": "4-Dimethylaminoazobenzene; see 1910.1015 \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** 4-Dimethylaminoazobenzene, see Section 5209\n\n**CAS No.:** 60117\n\n> 60117 | | 4-Dimethylaminoazobenzene, see Section 5209\n\nSource: \n", "cas_number": "60117", "file": "4-dimethylaminoazobenzene-see-section-5209.md", "generated": true, "harvested": "2026-08-05", "id": "4-dimethylaminoazobenzene-see-section-5209", "source_quote": "60117 | | 4-Dimethylaminoazobenzene, see Section 5209", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "4-Dimethylaminoazobenzene, see Section 5209", "title": "4-Dimethylaminoazobenzene, see Section 5209 \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** 4-Dimethylaminoazobenzene\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - 4-Dimethylaminoazobenzene\n\n**CAS No.:** 60-11-7\n\n> CAS No. 60-11-7\n\n**NIOSH REL, as stated:** Ca See Appendix A\n\n> NIOSH REL Ca See Appendix A\n\nSource: \n", "cas_number": "60-11-7", "file": "4-dimethylaminoazobenzene.md", "generated": true, "harvested": "2026-09-08", "id": "4-dimethylaminoazobenzene", "quote_cas_number": "CAS No. 60-11-7", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - 4-Dimethylaminoazobenzene", "rel_statement": "Ca See Appendix A", "source_quote": "NIOSH REL Ca See Appendix A", "sources": ["https://www.cdc.gov/niosh/npg/npgd0220.html"], "stale_after": "2027-09-08", "substance": "4-Dimethylaminoazobenzene", "title": "4-Dimethylaminoazobenzene \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** 4-Methoxyphenol\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - 4-Methoxyphenol\n\n**CAS No.:** 150-76-5\n\n> CAS No. 150-76-5\n\n**NIOSH REL (mg/m\u00b3):** TWA 5\n\n> NIOSH REL TWA 5 mg/m3\n\nSource: \n", "cas_number": "150-76-5", "file": "4-methoxyphenol-2.md", "generated": true, "harvested": "2026-09-08", "id": "4-methoxyphenol-2", "quote_cas_number": "CAS No. 150-76-5", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - 4-Methoxyphenol", "rel_mgm3": "TWA 5", "source_quote": "NIOSH REL TWA 5 mg/m3", "sources": ["https://www.cdc.gov/niosh/npg/npgd0390.html"], "stale_after": "2027-09-08", "substance": "4-Methoxyphenol", "title": "4-Methoxyphenol \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** 4-Methoxyphenol\n\n**CAS No.:** 150765\n\n**PEL (mg/m\u00b3):** 5\n\n> 150765 | | 4-Methoxyphenol | -- | 5\n\nSource: \n", "cas_number": "150765", "file": "4-methoxyphenol.md", "generated": true, "harvested": "2026-08-05", "id": "4-methoxyphenol", "pel_mgm3": "5", "source_quote": "150765 | | 4-Methoxyphenol | -- | 5", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "4-Methoxyphenol", "title": "4-Methoxyphenol \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** 4-Nitrobiphenyl\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - 4-Nitrobiphenyl\n\n**CAS No.:** 92-93-3\n\n> CAS No. 92-93-3\n\n**NIOSH REL, as stated:** Ca See Appendix A\n\n> NIOSH REL Ca See Appendix A\n\nSource: \n", "cas_number": "92-93-3", "file": "4-nitrobiphenyl.md", "generated": true, "harvested": "2026-09-08", "id": "4-nitrobiphenyl", "quote_cas_number": "CAS No. 92-93-3", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - 4-Nitrobiphenyl", "rel_statement": "Ca See Appendix A", "source_quote": "NIOSH REL Ca See Appendix A", "sources": ["https://www.cdc.gov/niosh/npg/npgd0451.html"], "stale_after": "2027-09-08", "substance": "4-Nitrobiphenyl", "title": "4-Nitrobiphenyl \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** 4-Nitrodiphenyl; see 1910.1003\n\n**CAS No.:** 92-93-3\n\n> 4-Nitrodiphenyl; see 1910.1003 | 92-93-3 | - | - | - |\n\nSource: \n", "cas_number": "92-93-3", "file": "4-nitrodiphenyl-see-1910-1003.md", "generated": true, "harvested": "2026-08-05", "id": "4-nitrodiphenyl-see-1910-1003", "source_quote": "4-Nitrodiphenyl; see 1910.1003 | 92-93-3 | - | - | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "4-Nitrodiphenyl; see 1910.1003", "title": "4-Nitrodiphenyl; see 1910.1003 \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** 4-Nitrodiphenyl, see Section 5209\n\n**CAS No.:** 92933\n\n> 92933 | | 4-Nitrodiphenyl, see Section 5209\n\nSource: \n", "cas_number": "92933", "file": "4-nitrodiphenyl-see-section-5209.md", "generated": true, "harvested": "2026-08-05", "id": "4-nitrodiphenyl-see-section-5209", "source_quote": "92933 | | 4-Nitrodiphenyl, see Section 5209", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "4-Nitrodiphenyl, see Section 5209", "title": "4-Nitrodiphenyl, see Section 5209 \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** 4-Vinyl cyclohexene\n\n**CAS No.:** 100403\n\n**PEL (ppm):** 0.1\n\n**PEL (mg/m\u00b3):** 0.4\n\n> 100403 | S | 4-Vinyl cyclohexene | 0.1 | 0.4\n\nSource: \n", "cas_number": "100403", "file": "4-vinyl-cyclohexene.md", "generated": true, "harvested": "2026-08-05", "id": "4-vinyl-cyclohexene", "pel_mgm3": "0.4", "pel_ppm": "0.1", "source_quote": "100403 | S | 4-Vinyl cyclohexene | 0.1 | 0.4", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "4-Vinyl cyclohexene", "title": "4-Vinyl cyclohexene \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** 5-Methyl-3-heptanone\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - 5-Methyl-3-heptanone\n\n**CAS No.:** 541-85-5\n\n> CAS No. 541-85-5\n\n**NIOSH REL (ppm):** TWA 25\n\n**NIOSH REL (mg/m\u00b3):** 130\n\n> NIOSH REL TWA 25 ppm (130 mg/m3)\n\nSource: \n", "cas_number": "541-85-5", "file": "5-methyl-3-heptanone.md", "generated": true, "harvested": "2026-09-08", "id": "5-methyl-3-heptanone", "quote_cas_number": "CAS No. 541-85-5", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - 5-Methyl-3-heptanone", "rel_mgm3": "130", "rel_ppm": "TWA 25", "source_quote": "NIOSH REL TWA 25 ppm (130 mg/m3)", "sources": ["https://www.cdc.gov/niosh/npg/npgd0418.html"], "stale_after": "2027-09-08", "substance": "5-Methyl-3-heptanone", "title": "5-Methyl-3-heptanone \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** a-Chloroacetophenone (Phenacyl chloride)\n\n**CAS No.:** 532-27-4\n\n**PEL (ppm):** 0.05\n\n**PEL (mg/m\u00b3):** 0.3\n\n> a-Chloroacetophenone (Phenacyl chloride) | 532-27-4 | 0.05 | 0.3 | - |\n\nSource: \n", "cas_number": "532-27-4", "file": "a-chloroacetophenone-phenacyl-chloride.md", "generated": true, "harvested": "2026-08-05", "id": "a-chloroacetophenone-phenacyl-chloride", "pel_mgm3": "0.3", "pel_ppm": "0.05", "source_quote": "a-Chloroacetophenone (Phenacyl chloride) | 532-27-4 | 0.05 | 0.3 | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "a-Chloroacetophenone (Phenacyl chloride)", "title": "a-Chloroacetophenone (Phenacyl chloride) \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Acetaldehyde\n\n**CAS No.:** 75070\n\n**PEL (ppm):** 25\n\n**PEL (mg/m\u00b3):** 45\n\n**Ceiling:** C\n\n> 75070 | | Acetaldehyde | 25 | 45 | C\n\nSource: \n", "cas_number": "75070", "ceiling": "C", "file": "acetaldehyde-2.md", "generated": true, "harvested": "2026-08-05", "id": "acetaldehyde-2", "pel_mgm3": "45", "pel_ppm": "25", "source_quote": "75070 | | Acetaldehyde | 25 | 45 | C", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Acetaldehyde", "title": "Acetaldehyde \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Acetaldehyde\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Acetaldehyde\n\n**CAS No.:** 75-07-0\n\n> CAS No. 75-07-0\n\n**NIOSH REL, as stated:** Ca See Appendix A See Appendix C (Aldehydes)\n\n> NIOSH REL Ca See Appendix A See Appendix C (Aldehydes)\n\nSource: \n", "cas_number": "75-07-0", "file": "acetaldehyde-3.md", "generated": true, "harvested": "2026-09-08", "id": "acetaldehyde-3", "quote_cas_number": "CAS No. 75-07-0", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Acetaldehyde", "rel_statement": "Ca See Appendix A See Appendix C (Aldehydes)", "source_quote": "NIOSH REL Ca See Appendix A See Appendix C (Aldehydes)", "sources": ["https://www.cdc.gov/niosh/npg/npgd0001.html"], "stale_after": "2027-09-08", "substance": "Acetaldehyde", "title": "Acetaldehyde \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Acetaldehyde\n\n**CAS No.:** 75-07-0\n\n**PEL (ppm):** 200\n\n**PEL (mg/m\u00b3):** 360\n\n> Acetaldehyde | 75-07-0 | 200 | 360 | - |\n\nSource: \n", "cas_number": "75-07-0", "file": "acetaldehyde.md", "generated": true, "harvested": "2026-08-05", "id": "acetaldehyde", "pel_mgm3": "360", "pel_ppm": "200", "source_quote": "Acetaldehyde | 75-07-0 | 200 | 360 | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Acetaldehyde", "title": "Acetaldehyde \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Acetic acid\n\n**CAS No.:** 64197\n\n**PEL (ppm):** 10\n\n**PEL (mg/m\u00b3):** 25\n\n**Ceiling:** 40 ppm\n\n**STEL (ppm):** 15\n\n**STEL (mg/m\u00b3):** 37\n\n> 64197 | | Acetic acid | 10 | 25 | 40 ppm | 15 | 37\n\nSource: \n", "cas_number": "64197", "ceiling": "40 ppm", "file": "acetic-acid-2.md", "generated": true, "harvested": "2026-08-05", "id": "acetic-acid-2", "pel_mgm3": "25", "pel_ppm": "10", "source_quote": "64197 | | Acetic acid | 10 | 25 | 40 ppm | 15 | 37", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "stel_mgm3": "37", "stel_ppm": "15", "substance": "Acetic acid", "title": "Acetic acid \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Acetic acid\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Acetic acid\n\n**CAS No.:** 64-19-7\n\n> CAS No. 64-19-7\n\n**NIOSH REL (ppm):** TWA 10\n\n**NIOSH REL (mg/m\u00b3):** 25\n\n> NIOSH REL TWA 10 ppm (25 mg/m3) ST 15 ppm (37 mg/m3)\n\nSource: \n", "cas_number": "64-19-7", "file": "acetic-acid-3.md", "generated": true, "harvested": "2026-09-08", "id": "acetic-acid-3", "quote_cas_number": "CAS No. 64-19-7", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Acetic acid", "rel_mgm3": "25", "rel_ppm": "TWA 10", "source_quote": "NIOSH REL TWA 10 ppm (25 mg/m3) ST 15 ppm (37 mg/m3)", "sources": ["https://www.cdc.gov/niosh/npg/npgd0002.html"], "stale_after": "2027-09-08", "substance": "Acetic acid", "title": "Acetic acid \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Acetic acid\n\n**CAS No.:** 64-19-7\n\n**PEL (ppm):** 10\n\n**PEL (mg/m\u00b3):** 25\n\n> Acetic acid | 64-19-7 | 10 | 25 | - |\n\nSource: \n", "cas_number": "64-19-7", "file": "acetic-acid.md", "generated": true, "harvested": "2026-08-05", "id": "acetic-acid", "pel_mgm3": "25", "pel_ppm": "10", "source_quote": "Acetic acid | 64-19-7 | 10 | 25 | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Acetic acid", "title": "Acetic acid \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Acetic Anhydride\n\n**CAS No.:** 108247\n\n**PEL (ppm):** 5\n\n**PEL (mg/m\u00b3):** 20\n\n**Ceiling:** C\n\n> 108247 | | Acetic Anhydride | 5 | 20 | C\n\nSource: \n", "cas_number": "108247", "ceiling": "C", "file": "acetic-anhydride-2.md", "generated": true, "harvested": "2026-08-05", "id": "acetic-anhydride-2", "pel_mgm3": "20", "pel_ppm": "5", "source_quote": "108247 | | Acetic Anhydride | 5 | 20 | C", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Acetic Anhydride", "title": "Acetic Anhydride \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Acetic anhydride\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Acetic anhydride\n\n**CAS No.:** 108-24-7\n\n> CAS No. 108-24-7\n\n**NIOSH REL (ppm):** C 5\n\n**NIOSH REL (mg/m\u00b3):** 20\n\n> NIOSH REL C 5 ppm (20 mg/m3)\n\nSource: \n", "cas_number": "108-24-7", "file": "acetic-anhydride-3.md", "generated": true, "harvested": "2026-09-08", "id": "acetic-anhydride-3", "quote_cas_number": "CAS No. 108-24-7", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Acetic anhydride", "rel_mgm3": "20", "rel_ppm": "C 5", "source_quote": "NIOSH REL C 5 ppm (20 mg/m3)", "sources": ["https://www.cdc.gov/niosh/npg/npgd0003.html"], "stale_after": "2027-09-08", "substance": "Acetic anhydride", "title": "Acetic anhydride \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Acetic anhydride\n\n**CAS No.:** 108-24-7\n\n**PEL (ppm):** 5\n\n**PEL (mg/m\u00b3):** 20\n\n> Acetic anhydride | 108-24-7 | 5 | 20 | - |\n\nSource: \n", "cas_number": "108-24-7", "file": "acetic-anhydride.md", "generated": true, "harvested": "2026-08-05", "id": "acetic-anhydride", "pel_mgm3": "20", "pel_ppm": "5", "source_quote": "Acetic anhydride | 108-24-7 | 5 | 20 | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Acetic anhydride", "title": "Acetic anhydride \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Acetone\n\n**CAS No.:** 67641\n\n**PEL (ppm):** 500\n\n**PEL (mg/m\u00b3):** 1200\n\n**Ceiling:** 3000 ppm\n\n**STEL (ppm):** 750\n\n**STEL (mg/m\u00b3):** 1780\n\n> 67641 | | Acetone | 500 | 1200 | 3000 ppm | 750 | 1780\n\nSource: \n", "cas_number": "67641", "ceiling": "3000 ppm", "file": "acetone-2.md", "generated": true, "harvested": "2026-08-05", "id": "acetone-2", "pel_mgm3": "1200", "pel_ppm": "500", "source_quote": "67641 | | Acetone | 500 | 1200 | 3000 ppm | 750 | 1780", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "stel_mgm3": "1780", "stel_ppm": "750", "substance": "Acetone", "title": "Acetone \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Acetone\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Acetone\n\n**CAS No.:** 67-64-1\n\n> CAS No. 67-64-1\n\n**NIOSH REL (ppm):** TWA 250\n\n**NIOSH REL (mg/m\u00b3):** 590\n\n> NIOSH REL TWA 250 ppm (590 mg/m3)\n\nSource: \n", "cas_number": "67-64-1", "file": "acetone-3.md", "generated": true, "harvested": "2026-09-08", "id": "acetone-3", "quote_cas_number": "CAS No. 67-64-1", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Acetone", "rel_mgm3": "590", "rel_ppm": "TWA 250", "source_quote": "NIOSH REL TWA 250 ppm (590 mg/m3)", "sources": ["https://www.cdc.gov/niosh/npg/npgd0004.html"], "stale_after": "2027-09-08", "substance": "Acetone", "title": "Acetone \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Acetone cyanohydrin as CN\n\n**CAS No.:** 75865\n\n**PEL (ppm):** 4.7\n\n**PEL (mg/m\u00b3):** 5\n\n**Ceiling:** C\n\n> 75865 | | Acetone cyanohydrin as CN | 4.7 | 5 | C\n\nSource: \n", "cas_number": "75865", "ceiling": "C", "file": "acetone-cyanohydrin-as-cn.md", "generated": true, "harvested": "2026-08-05", "id": "acetone-cyanohydrin-as-cn", "pel_mgm3": "5", "pel_ppm": "4.7", "source_quote": "75865 | | Acetone cyanohydrin as CN | 4.7 | 5 | C", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Acetone cyanohydrin as CN", "title": "Acetone cyanohydrin as CN \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Acetone cyanohydrin\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Acetone cyanohydrin\n\n**CAS No.:** 75-86-5\n\n> CAS No. 75-86-5\n\n**NIOSH REL (ppm):** C 1\n\n**NIOSH REL (mg/m\u00b3):** 4\n\n> NIOSH REL C 1 ppm (4 mg/m3) [15-minute]\n\nSource: \n", "cas_number": "75-86-5", "file": "acetone-cyanohydrin.md", "generated": true, "harvested": "2026-09-08", "id": "acetone-cyanohydrin", "quote_cas_number": "CAS No. 75-86-5", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Acetone cyanohydrin", "rel_mgm3": "4", "rel_ppm": "C 1", "source_quote": "NIOSH REL C 1 ppm (4 mg/m3) [15-minute]", "sources": ["https://www.cdc.gov/niosh/npg/npgd0005.html"], "stale_after": "2027-09-08", "substance": "Acetone cyanohydrin", "title": "Acetone cyanohydrin \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Acetone\n\n**CAS No.:** 67-64-1\n\n**PEL (ppm):** 1000\n\n**PEL (mg/m\u00b3):** 2400\n\n> Acetone | 67-64-1 | 1000 | 2400 | - |\n\nSource: \n", "cas_number": "67-64-1", "file": "acetone.md", "generated": true, "harvested": "2026-08-05", "id": "acetone", "pel_mgm3": "2400", "pel_ppm": "1000", "source_quote": "Acetone | 67-64-1 | 1000 | 2400 | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Acetone", "title": "Acetone \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Acetonitrile\n\n**CAS No.:** 75058\n\n**PEL (ppm):** 40\n\n**PEL (mg/m\u00b3):** 70\n\n**STEL (ppm):** 60\n\n**STEL (mg/m\u00b3):** 105\n\n> 75058 | S | Acetonitrile | 40 | 70 | | 60 | 105\n\nSource: \n", "cas_number": "75058", "file": "acetonitrile-2.md", "generated": true, "harvested": "2026-08-05", "id": "acetonitrile-2", "pel_mgm3": "70", "pel_ppm": "40", "source_quote": "75058 | S | Acetonitrile | 40 | 70 | | 60 | 105", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "stel_mgm3": "105", "stel_ppm": "60", "substance": "Acetonitrile", "title": "Acetonitrile \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Acetonitrile\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Acetonitrile\n\n**CAS No.:** 75-05-8\n\n> CAS No. 75-05-8\n\n**NIOSH REL (ppm):** TWA 20\n\n**NIOSH REL (mg/m\u00b3):** 34\n\n> NIOSH REL TWA 20 ppm (34 mg/m\u00b3)\n\nSource: \n", "cas_number": "75-05-8", "file": "acetonitrile-3.md", "generated": true, "harvested": "2026-09-08", "id": "acetonitrile-3", "quote_cas_number": "CAS No. 75-05-8", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Acetonitrile", "rel_mgm3": "34", "rel_ppm": "TWA 20", "source_quote": "NIOSH REL TWA 20 ppm (34 mg/m\u00b3)", "sources": ["https://www.cdc.gov/niosh/npg/npgd0006.html"], "stale_after": "2027-09-08", "substance": "Acetonitrile", "title": "Acetonitrile \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Acetonitrile\n\n**CAS No.:** 75-05-8\n\n**PEL (ppm):** 40\n\n**PEL (mg/m\u00b3):** 70\n\n> Acetonitrile | 75-05-8 | 40 | 70 | - |\n\nSource: \n", "cas_number": "75-05-8", "file": "acetonitrile.md", "generated": true, "harvested": "2026-08-05", "id": "acetonitrile", "pel_mgm3": "70", "pel_ppm": "40", "source_quote": "Acetonitrile | 75-05-8 | 40 | 70 | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Acetonitrile", "title": "Acetonitrile \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Acetophenone\n\n**CAS No.:** 98862\n\n**PEL (ppm):** 10\n\n**PEL (mg/m\u00b3):** 49\n\n> 98862 | | Acetophenone | 10 | 49\n\nSource: \n", "cas_number": "98862", "file": "acetophenone.md", "generated": true, "harvested": "2026-08-05", "id": "acetophenone", "pel_mgm3": "49", "pel_ppm": "10", "source_quote": "98862 | | Acetophenone | 10 | 49", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Acetophenone", "title": "Acetophenone \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Acetylene\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Acetylene\n\n**CAS No.:** 74-86-2\n\n> CAS No. 74-86-2\n\n**NIOSH REL (ppm):** C 2500\n\n**NIOSH REL (mg/m\u00b3):** 2662\n\n> NIOSH REL C 2500 ppm (2662 mg/m3)\n\nSource: \n", "cas_number": "74-86-2", "file": "acetylene-2.md", "generated": true, "harvested": "2026-09-08", "id": "acetylene-2", "quote_cas_number": "CAS No. 74-86-2", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Acetylene", "rel_mgm3": "2662", "rel_ppm": "C 2500", "source_quote": "NIOSH REL C 2500 ppm (2662 mg/m3)", "sources": ["https://www.cdc.gov/niosh/npg/npgd0008.html"], "stale_after": "2027-09-08", "substance": "Acetylene", "title": "Acetylene \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Acetylene dichloride; see 1,2-Dichloroethylene\n\n**CAS No.:** 540590\n\n> 540590 | | Acetylene dichloride; see 1,2-Dichloroethylene\n\nSource: \n", "cas_number": "540590", "file": "acetylene-dichloride-see-1-2-dichloroethylene.md", "generated": true, "harvested": "2026-08-05", "id": "acetylene-dichloride-see-1-2-dichloroethylene", "source_quote": "540590 | | Acetylene dichloride; see 1,2-Dichloroethylene", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Acetylene dichloride; see 1,2-Dichloroethylene", "title": "Acetylene dichloride; see 1,2-Dichloroethylene \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Acetylene tetrabromide: 1,1,2,2-tetrabromoethane\n\n**CAS No.:** 79276\n\n**PEL (ppm):** 1\n\n**PEL (mg/m\u00b3):** 14\n\n> 79276 | | Acetylene tetrabromide: 1,1,2,2-tetrabromoethane | 1 | 14\n\nSource: \n", "cas_number": "79276", "file": "acetylene-tetrabromide-1-1-2-2-tetrabromoethane.md", "generated": true, "harvested": "2026-08-05", "id": "acetylene-tetrabromide-1-1-2-2-tetrabromoethane", "pel_mgm3": "14", "pel_ppm": "1", "source_quote": "79276 | | Acetylene tetrabromide: 1,1,2,2-tetrabromoethane | 1 | 14", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Acetylene tetrabromide: 1,1,2,2-tetrabromoethane", "title": "Acetylene tetrabromide: 1,1,2,2-tetrabromoethane \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Acetylene tetrabromide\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Acetylene tetrabromide\n\n**CAS No.:** 79-27-6\n\n> CAS No. 79-27-6\n\n**NIOSH REL, as stated:** See Appendix D\n\n> NIOSH REL See Appendix D\n\nSource: \n", "cas_number": "79-27-6", "file": "acetylene-tetrabromide-2.md", "generated": true, "harvested": "2026-09-08", "id": "acetylene-tetrabromide-2", "quote_cas_number": "CAS No. 79-27-6", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Acetylene tetrabromide", "rel_statement": "See Appendix D", "source_quote": "NIOSH REL See Appendix D", "sources": ["https://www.cdc.gov/niosh/npg/npgd0009.html"], "stale_after": "2027-09-08", "substance": "Acetylene tetrabromide", "title": "Acetylene tetrabromide \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Acetylene tetrabromide\n\n**CAS No.:** 79-27-6\n\n**PEL (ppm):** 1\n\n**PEL (mg/m\u00b3):** 14\n\n> Acetylene tetrabromide | 79-27-6 | 1 | 14 | - |\n\nSource: \n", "cas_number": "79-27-6", "file": "acetylene-tetrabromide.md", "generated": true, "harvested": "2026-08-05", "id": "acetylene-tetrabromide", "pel_mgm3": "14", "pel_ppm": "1", "source_quote": "Acetylene tetrabromide | 79-27-6 | 1 | 14 | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Acetylene tetrabromide", "title": "Acetylene tetrabromide \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Acetylene tetrachloride; see 1,1,2,2-Tetrachloroethane\n\n**CAS No.:** 79345\n\n> 79345 | | Acetylene tetrachloride; see 1,1,2,2-Tetrachloroethane\n\nSource: \n", "cas_number": "79345", "file": "acetylene-tetrachloride-see-1-1-2-2-tetrachloroethane.md", "generated": true, "harvested": "2026-08-05", "id": "acetylene-tetrachloride-see-1-1-2-2-tetrachloroethane", "source_quote": "79345 | | Acetylene tetrachloride; see 1,1,2,2-Tetrachloroethane", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Acetylene tetrachloride; see 1,1,2,2-Tetrachloroethane", "title": "Acetylene tetrachloride; see 1,1,2,2-Tetrachloroethane \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Acetylene\n\n**CAS No.:** 74862\n\n> 74862 | | Acetylene | (h)\n\nSource: \n", "cas_number": "74862", "file": "acetylene.md", "generated": true, "harvested": "2026-08-05", "id": "acetylene", "source_quote": "74862 | | Acetylene | (h)", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Acetylene", "title": "Acetylene \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Acetylsalicylic acid (Aspirin)\n\n**CAS No.:** 50782\n\n**PEL (mg/m\u00b3):** 5\n\n> 50782 | | Acetylsalicylic acid (Aspirin) | -- | 5\n\nSource: \n", "cas_number": "50782", "file": "acetylsalicylic-acid-aspirin.md", "generated": true, "harvested": "2026-08-05", "id": "acetylsalicylic-acid-aspirin", "pel_mgm3": "5", "source_quote": "50782 | | Acetylsalicylic acid (Aspirin) | -- | 5", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Acetylsalicylic acid (Aspirin)", "title": "Acetylsalicylic acid (Aspirin) \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Acetylsalicylic acid\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Acetylsalicylic acid\n\n**CAS No.:** 50-78-2\n\n> CAS No. 50-78-2\n\n**NIOSH REL (mg/m\u00b3):** TWA 5\n\n> NIOSH REL TWA 5 mg/m3\n\nSource: \n", "cas_number": "50-78-2", "file": "acetylsalicylic-acid.md", "generated": true, "harvested": "2026-09-08", "id": "acetylsalicylic-acid", "quote_cas_number": "CAS No. 50-78-2", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Acetylsalicylic acid", "rel_mgm3": "TWA 5", "source_quote": "NIOSH REL TWA 5 mg/m3", "sources": ["https://www.cdc.gov/niosh/npg/npgd0010.html"], "stale_after": "2027-09-08", "substance": "Acetylsalicylic acid", "title": "Acetylsalicylic acid \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Acrolein\n\n**CAS No.:** 107028\n\n**PEL (ppm):** 0.1\n\n**PEL (mg/m\u00b3):** 0.25\n\n**Ceiling:** C\n\n> 107028 | S | Acrolein | 0.1 | 0.25 | C\n\nSource: \n", "cas_number": "107028", "ceiling": "C", "file": "acrolein-2.md", "generated": true, "harvested": "2026-08-05", "id": "acrolein-2", "pel_mgm3": "0.25", "pel_ppm": "0.1", "source_quote": "107028 | S | Acrolein | 0.1 | 0.25 | C", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Acrolein", "title": "Acrolein \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Acrolein\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Acrolein\n\n**CAS No.:** 107-02-8\n\n> CAS No. 107-02-8\n\n**NIOSH REL (ppm):** TWA 0.1\n\n**NIOSH REL (mg/m\u00b3):** 0.25\n\n> NIOSH REL TWA 0.1 ppm (0.25 mg/m3) ST 0.3 ppm (0.8 mg/m3)\n\nSource: \n", "cas_number": "107-02-8", "file": "acrolein-3.md", "generated": true, "harvested": "2026-09-08", "id": "acrolein-3", "quote_cas_number": "CAS No. 107-02-8", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Acrolein", "rel_mgm3": "0.25", "rel_ppm": "TWA 0.1", "source_quote": "NIOSH REL TWA 0.1 ppm (0.25 mg/m3) ST 0.3 ppm (0.8 mg/m3)", "sources": ["https://www.cdc.gov/niosh/npg/npgd0011.html"], "stale_after": "2027-09-08", "substance": "Acrolein", "title": "Acrolein \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Acrolein\n\n**CAS No.:** 107-02-8\n\n**PEL (ppm):** 0.1\n\n**PEL (mg/m\u00b3):** 0.25\n\n> Acrolein | 107-02-8 | 0.1 | 0.25 | - |\n\nSource: \n", "cas_number": "107-02-8", "file": "acrolein.md", "generated": true, "harvested": "2026-08-05", "id": "acrolein", "pel_mgm3": "0.25", "pel_ppm": "0.1", "source_quote": "Acrolein | 107-02-8 | 0.1 | 0.25 | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Acrolein", "title": "Acrolein \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Acrylamide\n\n**CAS No.:** 79061\n\n**PEL (mg/m\u00b3):** 0.03\n\n> 79061 | S | Acrylamide | -- | 0.03\n\nSource: \n", "cas_number": "79061", "file": "acrylamide-2.md", "generated": true, "harvested": "2026-08-05", "id": "acrylamide-2", "pel_mgm3": "0.03", "source_quote": "79061 | S | Acrylamide | -- | 0.03", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Acrylamide", "title": "Acrylamide \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Acrylamide\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Acrylamide\n\n**CAS No.:** 79-06-1\n\n> CAS No. 79-06-1\n\n**NIOSH REL (mg/m\u00b3):** TWA 0.03\n\n> NIOSH REL Ca TWA 0.03 mg/m3 [skin]\n\nSource: \n", "cas_number": "79-06-1", "file": "acrylamide-3.md", "generated": true, "harvested": "2026-09-08", "id": "acrylamide-3", "quote_cas_number": "CAS No. 79-06-1", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Acrylamide", "rel_mgm3": "TWA 0.03", "source_quote": "NIOSH REL Ca TWA 0.03 mg/m3 [skin]", "sources": ["https://www.cdc.gov/niosh/npg/npgd0012.html"], "stale_after": "2027-09-08", "substance": "Acrylamide", "title": "Acrylamide \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Acrylamide\n\n**CAS No.:** 79-06-1\n\n**PEL (mg/m\u00b3):** 0.3\n\n> Acrylamide | 79-06-1 | - | 0.3 | X |\n\nSource: \n", "cas_number": "79-06-1", "file": "acrylamide.md", "generated": true, "harvested": "2026-08-05", "id": "acrylamide", "pel_mgm3": "0.3", "source_quote": "Acrylamide | 79-06-1 | - | 0.3 | X |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Acrylamide", "title": "Acrylamide \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Acrylic acid\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Acrylic acid\n\n**CAS No.:** 79-10-7\n\n> CAS No. 79-10-7\n\n**NIOSH REL (ppm):** TWA 2\n\n**NIOSH REL (mg/m\u00b3):** 6\n\n> NIOSH REL TWA 2 ppm (6 mg/m3) [skin]\n\nSource: \n", "cas_number": "79-10-7", "file": "acrylic-acid-2.md", "generated": true, "harvested": "2026-09-08", "id": "acrylic-acid-2", "quote_cas_number": "CAS No. 79-10-7", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Acrylic acid", "rel_mgm3": "6", "rel_ppm": "TWA 2", "source_quote": "NIOSH REL TWA 2 ppm (6 mg/m3) [skin]", "sources": ["https://www.cdc.gov/niosh/npg/npgd0013.html"], "stale_after": "2027-09-08", "substance": "Acrylic acid", "title": "Acrylic acid \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Acrylic acid\n\n**CAS No.:** 79107\n\n**PEL (ppm):** 2\n\n**PEL (mg/m\u00b3):** 5.9\n\n> 79107 | S | Acrylic acid | 2 | 5.9\n\nSource: \n", "cas_number": "79107", "file": "acrylic-acid.md", "generated": true, "harvested": "2026-08-05", "id": "acrylic-acid", "pel_mgm3": "5.9", "pel_ppm": "2", "source_quote": "79107 | S | Acrylic acid | 2 | 5.9", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Acrylic acid", "title": "Acrylic acid \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Acrylonitrile; see 1910.1045\n\n**CAS No.:** 107-13-1\n\n> Acrylonitrile; see 1910.1045 | 107-13-1 | - | - | - |\n\nSource: \n", "cas_number": "107-13-1", "file": "acrylonitrile-see-1910-1045.md", "generated": true, "harvested": "2026-08-05", "id": "acrylonitrile-see-1910-1045", "source_quote": "Acrylonitrile; see 1910.1045 | 107-13-1 | - | - | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Acrylonitrile; see 1910.1045", "title": "Acrylonitrile; see 1910.1045 \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Acrylonitrile; see Section 5213\n\n**CAS No.:** 107131\n\n**PEL (ppm):** 2\n\n**PEL (mg/m\u00b3):** 4.5\n\n> 107131 | S | Acrylonitrile; see Section 5213 | 2 | 4.5\n\nSource: \n", "cas_number": "107131", "file": "acrylonitrile-see-section-5213.md", "generated": true, "harvested": "2026-08-05", "id": "acrylonitrile-see-section-5213", "pel_mgm3": "4.5", "pel_ppm": "2", "source_quote": "107131 | S | Acrylonitrile; see Section 5213 | 2 | 4.5", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Acrylonitrile; see Section 5213", "title": "Acrylonitrile; see Section 5213 \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Acrylonitrile\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Acrylonitrile\n\n**CAS No.:** 107-13-1\n\n> CAS No. 107-13-1\n\n**NIOSH REL (ppm):** TWA 1\n\n> NIOSH REL Ca TWA 1 ppm C 10 ppm [15-minute] [skin]\n\nSource: \n", "cas_number": "107-13-1", "file": "acrylonitrile.md", "generated": true, "harvested": "2026-09-08", "id": "acrylonitrile", "quote_cas_number": "CAS No. 107-13-1", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Acrylonitrile", "rel_ppm": "TWA 1", "source_quote": "NIOSH REL Ca TWA 1 ppm C 10 ppm [15-minute] [skin]", "sources": ["https://www.cdc.gov/niosh/npg/npgd0014.html"], "stale_after": "2027-09-08", "substance": "Acrylonitrile", "title": "Acrylonitrile \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Adipic acid\n\n**CAS No.:** 124049\n\n**PEL (mg/m\u00b3):** 5\n\n> 124049 | | Adipic acid | -- | 5\n\nSource: \n", "cas_number": "124049", "file": "adipic-acid.md", "generated": true, "harvested": "2026-08-05", "id": "adipic-acid", "pel_mgm3": "5", "source_quote": "124049 | | Adipic acid | -- | 5", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Adipic acid", "title": "Adipic acid \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Adiponitrile\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Adiponitrile\n\n**CAS No.:** 111-69-3\n\n> CAS No. 111-69-3\n\n**NIOSH REL (ppm):** TWA 4\n\n**NIOSH REL (mg/m\u00b3):** 18\n\n> NIOSH REL TWA 4 ppm (18 mg/m3)\n\nSource: \n", "cas_number": "111-69-3", "file": "adiponitrile-2.md", "generated": true, "harvested": "2026-09-08", "id": "adiponitrile-2", "quote_cas_number": "CAS No. 111-69-3", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Adiponitrile", "rel_mgm3": "18", "rel_ppm": "TWA 4", "source_quote": "NIOSH REL TWA 4 ppm (18 mg/m3)", "sources": ["https://www.cdc.gov/niosh/npg/npgd0015.html"], "stale_after": "2027-09-08", "substance": "Adiponitrile", "title": "Adiponitrile \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Adiponitrile\n\n**CAS No.:** 111693\n\n**PEL (ppm):** 2\n\n**PEL (mg/m\u00b3):** 8.8\n\n> 111693 | S | Adiponitrile | 2 | 8.8\n\nSource: \n", "cas_number": "111693", "file": "adiponitrile.md", "generated": true, "harvested": "2026-08-05", "id": "adiponitrile", "pel_mgm3": "8.8", "pel_ppm": "2", "source_quote": "111693 | S | Adiponitrile | 2 | 8.8", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Adiponitrile", "title": "Adiponitrile \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Aldrin; 1,2,3,4,10,10-hexachloro-1,4,4a,5,8,8a-hexahydro-endo-1,2-exo-5,8-dimethanonaphthalene\n\n**CAS No.:** 309002\n\n**PEL (mg/m\u00b3):** 0.25\n\n> 309002 | S | Aldrin; 1,2,3,4,10,10-hexachloro-1,4,4a,5,8,8a-hexahydro-endo-1,2-exo-5,8-dimethanonaphthalene | -- | 0.25\n\nSource: \n", "cas_number": "309002", "file": "aldrin-1-2-3-4-10-10-hexachloro-1-4-4a-5-8-8a-hexahydro-endo-1-2-exo-5-8-dimetha.md", "generated": true, "harvested": "2026-08-05", "id": "aldrin-1-2-3-4-10-10-hexachloro-1-4-4a-5-8-8a-hexahydro-endo-1-2-exo-5-8-dimetha", "pel_mgm3": "0.25", "source_quote": "309002 | S | Aldrin; 1,2,3,4,10,10-hexachloro-1,4,4a,5,8,8a-hexahydro-endo-1,2-exo-5,8-dimethanonaphthalene | -- | 0.25", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Aldrin; 1,2,3,4,10,10-hexachloro-1,4,4a,5,8,8a-hexahydro-endo-1,2-exo-5,8-dimethanonaphthalene", "title": "Aldrin; 1,2,3,4,10,10-hexachloro-1,4,4a,5,8,8a-hexahydro-endo-1,2-exo-5,8-dimethanonaphthalene \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Aldrin\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Aldrin\n\n**CAS No.:** 309-00-2\n\n> CAS No. 309-00-2\n\n**NIOSH REL (mg/m\u00b3):** TWA 0.25\n\n> NIOSH REL Ca TWA 0.25 mg/m3 [skin]\n\nSource: \n", "cas_number": "309-00-2", "file": "aldrin-2.md", "generated": true, "harvested": "2026-09-08", "id": "aldrin-2", "quote_cas_number": "CAS No. 309-00-2", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Aldrin", "rel_mgm3": "TWA 0.25", "source_quote": "NIOSH REL Ca TWA 0.25 mg/m3 [skin]", "sources": ["https://www.cdc.gov/niosh/npg/npgd0016.html"], "stale_after": "2027-09-08", "substance": "Aldrin", "title": "Aldrin \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Aldrin\n\n**CAS No.:** 309-00-2\n\n**PEL (mg/m\u00b3):** 0.25\n\n> Aldrin | 309-00-2 | - | 0.25 | X |\n\nSource: \n", "cas_number": "309-00-2", "file": "aldrin.md", "generated": true, "harvested": "2026-08-05", "id": "aldrin", "pel_mgm3": "0.25", "source_quote": "Aldrin | 309-00-2 | - | 0.25 | X |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Aldrin", "title": "Aldrin \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Allyl alcohol\n\n**CAS No.:** 107186\n\n**PEL (ppm):** 0.5\n\n**PEL (mg/m\u00b3):** 1.25\n\n**STEL (ppm):** 4\n\n**STEL (mg/m\u00b3):** 10\n\n> 107186 | S | Allyl alcohol | 0.5 | 1.25 | | 4 | 10\n\nSource: \n", "cas_number": "107186", "file": "allyl-alcohol-2.md", "generated": true, "harvested": "2026-08-05", "id": "allyl-alcohol-2", "pel_mgm3": "1.25", "pel_ppm": "0.5", "source_quote": "107186 | S | Allyl alcohol | 0.5 | 1.25 | | 4 | 10", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "stel_mgm3": "10", "stel_ppm": "4", "substance": "Allyl alcohol", "title": "Allyl alcohol \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Allyl alcohol\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Allyl alcohol\n\n**CAS No.:** 107-18-6\n\n> CAS No. 107-18-6\n\n**NIOSH REL (ppm):** TWA 2\n\n**NIOSH REL (mg/m\u00b3):** 5\n\n> NIOSH REL TWA 2 ppm (5 mg/m3) ST 4 ppm (10 mg/m3) [skin]\n\nSource: \n", "cas_number": "107-18-6", "file": "allyl-alcohol-3.md", "generated": true, "harvested": "2026-09-08", "id": "allyl-alcohol-3", "quote_cas_number": "CAS No. 107-18-6", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Allyl alcohol", "rel_mgm3": "5", "rel_ppm": "TWA 2", "source_quote": "NIOSH REL TWA 2 ppm (5 mg/m3) ST 4 ppm (10 mg/m3) [skin]", "sources": ["https://www.cdc.gov/niosh/npg/npgd0017.html"], "stale_after": "2027-09-08", "substance": "Allyl alcohol", "title": "Allyl alcohol \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Allyl alcohol\n\n**CAS No.:** 107-18-6\n\n**PEL (ppm):** 2\n\n**PEL (mg/m\u00b3):** 5\n\n> Allyl alcohol | 107-18-6 | 2 | 5 | X |\n\nSource: \n", "cas_number": "107-18-6", "file": "allyl-alcohol.md", "generated": true, "harvested": "2026-08-05", "id": "allyl-alcohol", "pel_mgm3": "5", "pel_ppm": "2", "source_quote": "Allyl alcohol | 107-18-6 | 2 | 5 | X |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Allyl alcohol", "title": "Allyl alcohol \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Allyl chloride\n\n**CAS No.:** 107051\n\n**PEL (ppm):** 1\n\n**PEL (mg/m\u00b3):** 3\n\n**STEL (ppm):** 2\n\n**STEL (mg/m\u00b3):** 6\n\n> 107051 | | Allyl chloride | 1 | 3 | | 2 | 6\n\nSource: \n", "cas_number": "107051", "file": "allyl-chloride-2.md", "generated": true, "harvested": "2026-08-05", "id": "allyl-chloride-2", "pel_mgm3": "3", "pel_ppm": "1", "source_quote": "107051 | | Allyl chloride | 1 | 3 | | 2 | 6", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "stel_mgm3": "6", "stel_ppm": "2", "substance": "Allyl chloride", "title": "Allyl chloride \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Allyl chloride\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Allyl chloride\n\n**CAS No.:** 107-05-1\n\n> CAS No. 107-05-1\n\n**NIOSH REL (ppm):** TWA 1\n\n**NIOSH REL (mg/m\u00b3):** 3\n\n> NIOSH REL TWA 1 ppm (3 mg/m3) ST 2 ppm (6 mg/m3)\n\nSource: \n", "cas_number": "107-05-1", "file": "allyl-chloride-3.md", "generated": true, "harvested": "2026-09-08", "id": "allyl-chloride-3", "quote_cas_number": "CAS No. 107-05-1", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Allyl chloride", "rel_mgm3": "3", "rel_ppm": "TWA 1", "source_quote": "NIOSH REL TWA 1 ppm (3 mg/m3) ST 2 ppm (6 mg/m3)", "sources": ["https://www.cdc.gov/niosh/npg/npgd0018.html"], "stale_after": "2027-09-08", "substance": "Allyl chloride", "title": "Allyl chloride \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Allyl chloride\n\n**CAS No.:** 107-05-1\n\n**PEL (ppm):** 1\n\n**PEL (mg/m\u00b3):** 3\n\n> Allyl chloride | 107-05-1 | 1 | 3 | - |\n\nSource: \n", "cas_number": "107-05-1", "file": "allyl-chloride.md", "generated": true, "harvested": "2026-08-05", "id": "allyl-chloride", "pel_mgm3": "3", "pel_ppm": "1", "source_quote": "Allyl chloride | 107-05-1 | 1 | 3 | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Allyl chloride", "title": "Allyl chloride \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Allyl glycidyl ether; AGE\n\n**CAS No.:** 106923\n\n**PEL (ppm):** 0.2\n\n**PEL (mg/m\u00b3):** 0.93\n\n> 106923 | S | Allyl glycidyl ether; AGE | 0.2 | 0.93\n\nSource: \n", "cas_number": "106923", "file": "allyl-glycidyl-ether-age-2.md", "generated": true, "harvested": "2026-08-05", "id": "allyl-glycidyl-ether-age-2", "pel_mgm3": "0.93", "pel_ppm": "0.2", "source_quote": "106923 | S | Allyl glycidyl ether; AGE | 0.2 | 0.93", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Allyl glycidyl ether; AGE", "title": "Allyl glycidyl ether; AGE \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Allyl glycidyl ether (AGE)\n\n**CAS No.:** 106-92-3\n\n**PEL (ppm):** (C)10\n\n**PEL (mg/m\u00b3):** (C)45\n\n> Allyl glycidyl ether (AGE) | 106-92-3 | (C)10 | (C)45 | - |\n\nSource: \n", "cas_number": "106-92-3", "file": "allyl-glycidyl-ether-age.md", "generated": true, "harvested": "2026-08-05", "id": "allyl-glycidyl-ether-age", "pel_mgm3": "(C)45", "pel_ppm": "(C)10", "source_quote": "Allyl glycidyl ether (AGE) | 106-92-3 | (C)10 | (C)45 | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Allyl glycidyl ether (AGE)", "title": "Allyl glycidyl ether (AGE) \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Allyl glycidyl ether\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Allyl glycidyl ether\n\n**CAS No.:** 106-92-3\n\n> CAS No. 106-92-3\n\n**NIOSH REL (ppm):** TWA 5\n\n**NIOSH REL (mg/m\u00b3):** 22\n\n> NIOSH REL TWA 5 ppm (22 mg/m3) ST 10 ppm (44 mg/m3) [skin]\n\nSource: \n", "cas_number": "106-92-3", "file": "allyl-glycidyl-ether.md", "generated": true, "harvested": "2026-09-08", "id": "allyl-glycidyl-ether", "quote_cas_number": "CAS No. 106-92-3", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Allyl glycidyl ether", "rel_mgm3": "22", "rel_ppm": "TWA 5", "source_quote": "NIOSH REL TWA 5 ppm (22 mg/m3) ST 10 ppm (44 mg/m3) [skin]", "sources": ["https://www.cdc.gov/niosh/npg/npgd0019.html"], "stale_after": "2027-09-08", "substance": "Allyl glycidyl ether", "title": "Allyl glycidyl ether \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Allyl propyl disulfide\n\n**CAS No.:** 2179591\n\n**PEL (ppm):** 2\n\n**PEL (mg/m\u00b3):** 12\n\n**STEL (ppm):** 3\n\n**STEL (mg/m\u00b3):** 18\n\n> 2179591 | | Allyl propyl disulfide | 2 | 12 | | 3 | 18\n\nSource: \n", "cas_number": "2179591", "file": "allyl-propyl-disulfide-2.md", "generated": true, "harvested": "2026-08-05", "id": "allyl-propyl-disulfide-2", "pel_mgm3": "12", "pel_ppm": "2", "source_quote": "2179591 | | Allyl propyl disulfide | 2 | 12 | | 3 | 18", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "stel_mgm3": "18", "stel_ppm": "3", "substance": "Allyl propyl disulfide", "title": "Allyl propyl disulfide \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Allyl propyl disulfide\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Allyl propyl disulfide\n\n**CAS No.:** 2179-59-1\n\n> CAS No. 2179-59-1\n\n**NIOSH REL (ppm):** TWA 2\n\n**NIOSH REL (mg/m\u00b3):** 12\n\n> NIOSH REL TWA 2 ppm (12 mg/m3) ST 3 ppm (18 mg/m3)\n\nSource: \n", "cas_number": "2179-59-1", "file": "allyl-propyl-disulfide-3.md", "generated": true, "harvested": "2026-09-08", "id": "allyl-propyl-disulfide-3", "quote_cas_number": "CAS No. 2179-59-1", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Allyl propyl disulfide", "rel_mgm3": "12", "rel_ppm": "TWA 2", "source_quote": "NIOSH REL TWA 2 ppm (12 mg/m3) ST 3 ppm (18 mg/m3)", "sources": ["https://www.cdc.gov/niosh/npg/npgd0020.html"], "stale_after": "2027-09-08", "substance": "Allyl propyl disulfide", "title": "Allyl propyl disulfide \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Allyl propyl disulfide\n\n**CAS No.:** 2179-59-1\n\n**PEL (ppm):** 2\n\n**PEL (mg/m\u00b3):** 12\n\n> Allyl propyl disulfide | 2179-59-1 | 2 | 12 | - |\n\nSource: \n", "cas_number": "2179-59-1", "file": "allyl-propyl-disulfide.md", "generated": true, "harvested": "2026-08-05", "id": "allyl-propyl-disulfide", "pel_mgm3": "12", "pel_ppm": "2", "source_quote": "Allyl propyl disulfide | 2179-59-1 | 2 | 12 | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Allyl propyl disulfide", "title": "Allyl propyl disulfide \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** alpha-Alumina\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - alpha-Alumina\n\n**CAS No.:** 1344-28-1\n\n> CAS No. 1344-28-1\n\n**NIOSH REL, as stated:** See Appendix D\n\n> NIOSH REL See Appendix D\n\nSource: \n", "cas_number": "1344-28-1", "file": "alpha-alumina-2.md", "generated": true, "harvested": "2026-09-08", "id": "alpha-alumina-2", "quote_cas_number": "CAS No. 1344-28-1", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - alpha-Alumina", "rel_statement": "See Appendix D", "source_quote": "NIOSH REL See Appendix D", "sources": ["https://www.cdc.gov/niosh/npg/npgd0021.html"], "stale_after": "2027-09-08", "substance": "alpha-Alumina", "title": "alpha-Alumina \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** alpha-Alumina\n\n**CAS No.:** 1344-28-1\n\n> alpha-Alumina | 1344-28-1 | - | - | - |\n\nSource: \n", "cas_number": "1344-28-1", "file": "alpha-alumina.md", "generated": true, "harvested": "2026-08-05", "id": "alpha-alumina", "source_quote": "alpha-Alumina | 1344-28-1 | - | - | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "alpha-Alumina", "title": "alpha-Alumina \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** alpha-Chloroacetophenone; phenacyl chloride\n\n**CAS No.:** 532274\n\n**PEL (ppm):** 0.05\n\n**PEL (mg/m\u00b3):** 0.3\n\n> 532274 | | alpha-Chloroacetophenone; phenacyl chloride | 0.05 | 0.3\n\nSource: \n", "cas_number": "532274", "file": "alpha-chloroacetophenone-phenacyl-chloride.md", "generated": true, "harvested": "2026-08-05", "id": "alpha-chloroacetophenone-phenacyl-chloride", "pel_mgm3": "0.3", "pel_ppm": "0.05", "source_quote": "532274 | | alpha-Chloroacetophenone; phenacyl chloride | 0.05 | 0.3", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "alpha-Chloroacetophenone; phenacyl chloride", "title": "alpha-Chloroacetophenone; phenacyl chloride \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** alpha-Chloroacetophenone\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - alpha-Chloroacetophenone\n\n**CAS No.:** 532-27-4\n\n> CAS No. 532-27-4\n\n**NIOSH REL (ppm):** 0.05\n\n**NIOSH REL (mg/m\u00b3):** TWA 0.3\n\n> NIOSH REL TWA 0.3 mg/m3 (0.05 ppm)\n\nSource: \n", "cas_number": "532-27-4", "file": "alpha-chloroacetophenone.md", "generated": true, "harvested": "2026-09-08", "id": "alpha-chloroacetophenone", "quote_cas_number": "CAS No. 532-27-4", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - alpha-Chloroacetophenone", "rel_mgm3": "TWA 0.3", "rel_ppm": "0.05", "source_quote": "NIOSH REL TWA 0.3 mg/m3 (0.05 ppm)", "sources": ["https://www.cdc.gov/niosh/npg/npgd0119.html"], "stale_after": "2027-09-08", "substance": "alpha-Chloroacetophenone", "title": "alpha-Chloroacetophenone \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** alpha-Methyl styrene\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - alpha-Methyl styrene\n\n**CAS No.:** 98-83-9\n\n> CAS No. 98-83-9\n\n**NIOSH REL (ppm):** TWA 50\n\n**NIOSH REL (mg/m\u00b3):** 240\n\n> NIOSH REL TWA 50 ppm (240 mg/m3) ST 100 ppm (485 mg/m3)\n\nSource: \n", "cas_number": "98-83-9", "file": "alpha-methyl-styrene-2.md", "generated": true, "harvested": "2026-09-08", "id": "alpha-methyl-styrene-2", "quote_cas_number": "CAS No. 98-83-9", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - alpha-Methyl styrene", "rel_mgm3": "240", "rel_ppm": "TWA 50", "source_quote": "NIOSH REL TWA 50 ppm (240 mg/m3) ST 100 ppm (485 mg/m3)", "sources": ["https://www.cdc.gov/niosh/npg/npgd0429.html"], "stale_after": "2027-09-08", "substance": "alpha-Methyl styrene", "title": "alpha-Methyl styrene \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** alpha-Methyl styrene\n\n**CAS No.:** 98-83-9\n\n**PEL (ppm):** (C)100\n\n**PEL (mg/m\u00b3):** (C)480\n\n> alpha-Methyl styrene | 98-83-9 | (C)100 | (C)480 | - |\n\nSource: \n", "cas_number": "98-83-9", "file": "alpha-methyl-styrene.md", "generated": true, "harvested": "2026-08-05", "id": "alpha-methyl-styrene", "pel_mgm3": "(C)480", "pel_ppm": "(C)100", "source_quote": "alpha-Methyl styrene | 98-83-9 | (C)100 | (C)480 | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "alpha-Methyl styrene", "title": "alpha-Methyl styrene \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** alpha-Methylacrylonitrile\n\n**CAS No.:** 126987\n\n**PEL (ppm):** 1\n\n**PEL (mg/m\u00b3):** 3\n\n> 126987 | S | alpha-Methylacrylonitrile | 1 | 3\n\nSource: \n", "cas_number": "126987", "file": "alpha-methylacrylonitrile.md", "generated": true, "harvested": "2026-08-05", "id": "alpha-methylacrylonitrile", "pel_mgm3": "3", "pel_ppm": "1", "source_quote": "126987 | S | alpha-Methylacrylonitrile | 1 | 3", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "alpha-Methylacrylonitrile", "title": "alpha-Methylacrylonitrile \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** alpha-Methylstyrene; 1-methyl-1-phenylethene\n\n**CAS No.:** 98839\n\n**PEL (ppm):** 50\n\n**PEL (mg/m\u00b3):** 240\n\n**STEL (ppm):** 100\n\n**STEL (mg/m\u00b3):** 485\n\n> 98839 | | alpha-Methylstyrene; 1-methyl-1-phenylethene | 50 | 240 | | 100 | 485\n\nSource: \n", "cas_number": "98839", "file": "alpha-methylstyrene-1-methyl-1-phenylethene.md", "generated": true, "harvested": "2026-08-05", "id": "alpha-methylstyrene-1-methyl-1-phenylethene", "pel_mgm3": "240", "pel_ppm": "50", "source_quote": "98839 | | alpha-Methylstyrene; 1-methyl-1-phenylethene | 50 | 240 | | 100 | 485", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "stel_mgm3": "485", "stel_ppm": "100", "substance": "alpha-Methylstyrene; 1-methyl-1-phenylethene", "title": "alpha-Methylstyrene; 1-methyl-1-phenylethene \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** alpha-Naphthylamine; 1-naphthylamine, see Section 5209\n\n**CAS No.:** 134327\n\n> 134327 | | alpha-Naphthylamine; 1-naphthylamine, see Section 5209\n\nSource: \n", "cas_number": "134327", "file": "alpha-naphthylamine-1-naphthylamine-see-section-5209.md", "generated": true, "harvested": "2026-08-05", "id": "alpha-naphthylamine-1-naphthylamine-see-section-5209", "source_quote": "134327 | | alpha-Naphthylamine; 1-naphthylamine, see Section 5209", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "alpha-Naphthylamine; 1-naphthylamine, see Section 5209", "title": "alpha-Naphthylamine; 1-naphthylamine, see Section 5209 \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** alpha-Naphthylamine; see 1910.1004\n\n**CAS No.:** 134-32-7\n\n> alpha-Naphthylamine; see 1910.1004 | 134-32-7 | - | - | - |\n\nSource: \n", "cas_number": "134-32-7", "file": "alpha-naphthylamine-see-1910-1004.md", "generated": true, "harvested": "2026-08-05", "id": "alpha-naphthylamine-see-1910-1004", "source_quote": "alpha-Naphthylamine; see 1910.1004 | 134-32-7 | - | - | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "alpha-Naphthylamine; see 1910.1004", "title": "alpha-Naphthylamine; see 1910.1004 \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** alpha-Naphthylamine\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - alpha-Naphthylamine\n\n**CAS No.:** 134-32-7\n\n> CAS No. 134-32-7\n\n**NIOSH REL, as stated:** Ca See Appendix A\n\n> NIOSH REL Ca See Appendix A\n\nSource: \n", "cas_number": "134-32-7", "file": "alpha-naphthylamine.md", "generated": true, "harvested": "2026-09-08", "id": "alpha-naphthylamine", "quote_cas_number": "CAS No. 134-32-7", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - alpha-Naphthylamine", "rel_statement": "Ca See Appendix A", "source_quote": "NIOSH REL Ca See Appendix A", "sources": ["https://www.cdc.gov/niosh/npg/npgd0441.html"], "stale_after": "2027-09-08", "substance": "alpha-Naphthylamine", "title": "alpha-Naphthylamine \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Alumina; see Particulates not otherwise regulated\n\n**CAS No.:** 1344281\n\n> 1344281 | | Alumina; see Particulates not otherwise regulated\n\nSource: \n", "cas_number": "1344281", "file": "alumina-see-particulates-not-otherwise-regulated.md", "generated": true, "harvested": "2026-08-05", "id": "alumina-see-particulates-not-otherwise-regulated", "source_quote": "1344281 | | Alumina; see Particulates not otherwise regulated", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Alumina; see Particulates not otherwise regulated", "title": "Alumina; see Particulates not otherwise regulated \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Aluminum distearate\n\n**CAS No.:** 300925\n\n**PEL (mg/m\u00b3):** 10\n\n> 300925 | | Aluminum distearate | -- | 10\n\nSource: \n", "cas_number": "300925", "file": "aluminum-distearate.md", "generated": true, "harvested": "2026-08-05", "id": "aluminum-distearate", "pel_mgm3": "10", "source_quote": "300925 | | Aluminum distearate | -- | 10", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Aluminum distearate", "title": "Aluminum distearate \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Aluminum, metal (as Al)\n\n**CAS No.:** 7429-90-5\n\n> Aluminum, metal (as Al) | 7429-90-5 | - | - | - |\n\nSource: \n", "cas_number": "7429-90-5", "file": "aluminum-metal-as-al.md", "generated": true, "harvested": "2026-08-05", "id": "aluminum-metal-as-al", "source_quote": "Aluminum, metal (as Al) | 7429-90-5 | - | - | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Aluminum, metal (as Al)", "title": "Aluminum, metal (as Al) \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Aluminum stearate\n\n**CAS No.:** 7047849\n\n**PEL (mg/m\u00b3):** 10\n\n> 7047849 | | Aluminum stearate | -- | 10\n\nSource: \n", "cas_number": "7047849", "file": "aluminum-stearate.md", "generated": true, "harvested": "2026-08-05", "id": "aluminum-stearate", "pel_mgm3": "10", "source_quote": "7047849 | | Aluminum stearate | -- | 10", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Aluminum stearate", "title": "Aluminum stearate \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Aluminum tristearate\n\n**CAS No.:** 637127\n\n**PEL (mg/m\u00b3):** 10\n\n> 637127 | | Aluminum tristearate | -- | 10\n\nSource: \n", "cas_number": "637127", "file": "aluminum-tristearate.md", "generated": true, "harvested": "2026-08-05", "id": "aluminum-tristearate", "pel_mgm3": "10", "source_quote": "637127 | | Aluminum tristearate | -- | 10", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Aluminum tristearate", "title": "Aluminum tristearate \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Aluminum\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Aluminum\n\n**CAS No.:** 7429-90-5\n\n> CAS No. 7429-90-5\n\n**NIOSH REL, as stated:** TWA 10 mg/m3 (total) TWA 5 mg/m3 (resp)\n\n> NIOSH REL TWA 10 mg/m3 (total) TWA 5 mg/m3 (resp)\n\nSource: \n", "cas_number": "7429-90-5", "file": "aluminum.md", "generated": true, "harvested": "2026-09-08", "id": "aluminum", "quote_cas_number": "CAS No. 7429-90-5", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Aluminum", "rel_statement": "TWA 10 mg/m3 (total) TWA 5 mg/m3 (resp)", "source_quote": "NIOSH REL TWA 10 mg/m3 (total) TWA 5 mg/m3 (resp)", "sources": ["https://www.cdc.gov/niosh/npg/npgd0022.html"], "stale_after": "2027-09-08", "substance": "Aluminum", "title": "Aluminum \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Aminodimethylbenzene; see Xylidene\n\n**CAS No.:** 1300738\n\n> 1300738 | | Aminodimethylbenzene; see Xylidene\n\nSource: \n", "cas_number": "1300738", "file": "aminodimethylbenzene-see-xylidene.md", "generated": true, "harvested": "2026-08-05", "id": "aminodimethylbenzene-see-xylidene", "source_quote": "1300738 | | Aminodimethylbenzene; see Xylidene", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Aminodimethylbenzene; see Xylidene", "title": "Aminodimethylbenzene; see Xylidene \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Amitrole\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Amitrole\n\n**CAS No.:** 61-82-5\n\n> CAS No. 61-82-5\n\n**NIOSH REL (mg/m\u00b3):** TWA 0.2\n\n> NIOSH REL Ca TWA 0.2 mg/m3\n\nSource: \n", "cas_number": "61-82-5", "file": "amitrole-2.md", "generated": true, "harvested": "2026-09-08", "id": "amitrole-2", "quote_cas_number": "CAS No. 61-82-5", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Amitrole", "rel_mgm3": "TWA 0.2", "source_quote": "NIOSH REL Ca TWA 0.2 mg/m3", "sources": ["https://www.cdc.gov/niosh/npg/npgd0027.html"], "stale_after": "2027-09-08", "substance": "Amitrole", "title": "Amitrole \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Amitrole\n\n**CAS No.:** 61825\n\n**PEL (mg/m\u00b3):** 0.2\n\n> 61825 | | Amitrole | -- | 0.2\n\nSource: \n", "cas_number": "61825", "file": "amitrole.md", "generated": true, "harvested": "2026-08-05", "id": "amitrole", "pel_mgm3": "0.2", "source_quote": "61825 | | Amitrole | -- | 0.2", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Amitrole", "title": "Amitrole \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Ammonia\n\n**CAS No.:** 7664417\n\n**PEL (ppm):** 25\n\n**PEL (mg/m\u00b3):** 18\n\n**STEL (ppm):** 35\n\n**STEL (mg/m\u00b3):** 27\n\n> 7664417 | | Ammonia | 25 | 18 | | 35 | 27\n\nSource: \n", "cas_number": "7664417", "file": "ammonia-2.md", "generated": true, "harvested": "2026-08-05", "id": "ammonia-2", "pel_mgm3": "18", "pel_ppm": "25", "source_quote": "7664417 | | Ammonia | 25 | 18 | | 35 | 27", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "stel_mgm3": "27", "stel_ppm": "35", "substance": "Ammonia", "title": "Ammonia \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Ammonia\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Ammonia\n\n**CAS No.:** 7664-41-7\n\n> CAS No. 7664-41-7\n\n**NIOSH REL (ppm):** TWA 25\n\n**NIOSH REL (mg/m\u00b3):** 18\n\n> NIOSH REL TWA 25 ppm (18 mg/m3) ST 35 ppm (27 mg/m3)\n\nSource: \n", "cas_number": "7664-41-7", "file": "ammonia-3.md", "generated": true, "harvested": "2026-09-08", "id": "ammonia-3", "quote_cas_number": "CAS No. 7664-41-7", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Ammonia", "rel_mgm3": "18", "rel_ppm": "TWA 25", "source_quote": "NIOSH REL TWA 25 ppm (18 mg/m3) ST 35 ppm (27 mg/m3)", "sources": ["https://www.cdc.gov/niosh/npg/npgd0028.html"], "stale_after": "2027-09-08", "substance": "Ammonia", "title": "Ammonia \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Ammonia\n\n**CAS No.:** 7664-41-7\n\n**PEL (ppm):** 50\n\n**PEL (mg/m\u00b3):** 35\n\n> Ammonia | 7664-41-7 | 50 | 35 | - |\n\nSource: \n", "cas_number": "7664-41-7", "file": "ammonia.md", "generated": true, "harvested": "2026-08-05", "id": "ammonia", "pel_mgm3": "35", "pel_ppm": "50", "source_quote": "Ammonia | 7664-41-7 | 50 | 35 | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Ammonia", "title": "Ammonia \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Ammonium chloride fume\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Ammonium chloride fume\n\n**CAS No.:** 12125-02-9\n\n> CAS No. 12125-02-9\n\n**NIOSH REL (mg/m\u00b3):** TWA 10\n\n> NIOSH REL TWA 10 mg/m3 ST 20 mg/m3\n\nSource: \n", "cas_number": "12125-02-9", "file": "ammonium-chloride-fume-2.md", "generated": true, "harvested": "2026-09-08", "id": "ammonium-chloride-fume-2", "quote_cas_number": "CAS No. 12125-02-9", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Ammonium chloride fume", "rel_mgm3": "TWA 10", "source_quote": "NIOSH REL TWA 10 mg/m3 ST 20 mg/m3", "sources": ["https://www.cdc.gov/niosh/npg/npgd0029.html"], "stale_after": "2027-09-08", "substance": "Ammonium chloride fume", "title": "Ammonium chloride fume \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Ammonium chloride fume\n\n**CAS No.:** 12125029\n\n**PEL (mg/m\u00b3):** 10\n\n**STEL (mg/m\u00b3):** 20\n\n> 12125029 | | Ammonium chloride fume | -- | 10 | | -- | 20\n\nSource: \n", "cas_number": "12125029", "file": "ammonium-chloride-fume.md", "generated": true, "harvested": "2026-08-05", "id": "ammonium-chloride-fume", "pel_mgm3": "10", "source_quote": "12125029 | | Ammonium chloride fume | -- | 10 | | -- | 20", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "stel_mgm3": "20", "substance": "Ammonium chloride fume", "title": "Ammonium chloride fume \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Ammonium perfluorooctanoate\n\n**CAS No.:** 3825261\n\n**PEL (mg/m\u00b3):** 0.01\n\n> 3825261 | S | Ammonium perfluorooctanoate | -- | 0.01\n\nSource: \n", "cas_number": "3825261", "file": "ammonium-perfluorooctanoate.md", "generated": true, "harvested": "2026-08-05", "id": "ammonium-perfluorooctanoate", "pel_mgm3": "0.01", "source_quote": "3825261 | S | Ammonium perfluorooctanoate | -- | 0.01", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Ammonium perfluorooctanoate", "title": "Ammonium perfluorooctanoate \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Ammonium stearate\n\n**CAS No.:** 1002897\n\n**PEL (mg/m\u00b3):** 10\n\n> 1002897 | | Ammonium stearate | -- | 10\n\nSource: \n", "cas_number": "1002897", "file": "ammonium-stearate.md", "generated": true, "harvested": "2026-08-05", "id": "ammonium-stearate", "pel_mgm3": "10", "source_quote": "1002897 | | Ammonium stearate | -- | 10", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Ammonium stearate", "title": "Ammonium stearate \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Ammonium sulfamate\n\n**CAS No.:** 7773060\n\n> 7773060 | | Ammonium sulfamate | --\n\nSource: \n", "cas_number": "7773060", "file": "ammonium-sulfamate-2.md", "generated": true, "harvested": "2026-08-05", "id": "ammonium-sulfamate-2", "source_quote": "7773060 | | Ammonium sulfamate | --", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Ammonium sulfamate", "title": "Ammonium sulfamate \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Ammonium sulfamate\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Ammonium sulfamate\n\n**CAS No.:** 7773-06-0\n\n> CAS No. 7773-06-0\n\n**NIOSH REL, as stated:** TWA 10 mg/m3 (total) TWA 5 mg/m3 (resp)\n\n> NIOSH REL TWA 10 mg/m3 (total) TWA 5 mg/m3 (resp)\n\nSource: \n", "cas_number": "7773-06-0", "file": "ammonium-sulfamate-3.md", "generated": true, "harvested": "2026-09-08", "id": "ammonium-sulfamate-3", "quote_cas_number": "CAS No. 7773-06-0", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Ammonium sulfamate", "rel_statement": "TWA 10 mg/m3 (total) TWA 5 mg/m3 (resp)", "source_quote": "NIOSH REL TWA 10 mg/m3 (total) TWA 5 mg/m3 (resp)", "sources": ["https://www.cdc.gov/niosh/npg/npgd0030.html"], "stale_after": "2027-09-08", "substance": "Ammonium sulfamate", "title": "Ammonium sulfamate \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Ammonium sulfamate\n\n**CAS No.:** 7773-06-0\n\n> Ammonium sulfamate | 7773-06-0 | - | - | - |\n\nSource: \n", "cas_number": "7773-06-0", "file": "ammonium-sulfamate.md", "generated": true, "harvested": "2026-08-05", "id": "ammonium-sulfamate", "source_quote": "Ammonium sulfamate | 7773-06-0 | - | - | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Ammonium sulfamate", "title": "Ammonium sulfamate \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Aniline (and homologs)\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Aniline (and homologs)\n\n**CAS No.:** 62-53-3\n\n> CAS No. 62-53-3\n\n**NIOSH REL, as stated:** Ca See Appendix A\n\n> NIOSH REL Ca See Appendix A\n\nSource: \n", "cas_number": "62-53-3", "file": "aniline-and-homologs-2.md", "generated": true, "harvested": "2026-09-08", "id": "aniline-and-homologs-2", "quote_cas_number": "CAS No. 62-53-3", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Aniline (and homologs)", "rel_statement": "Ca See Appendix A", "source_quote": "NIOSH REL Ca See Appendix A", "sources": ["https://www.cdc.gov/niosh/npg/npgd0033.html"], "stale_after": "2027-09-08", "substance": "Aniline (and homologs)", "title": "Aniline (and homologs) \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Aniline and homologs\n\n**CAS No.:** 62-53-3\n\n**PEL (ppm):** 5\n\n**PEL (mg/m\u00b3):** 19\n\n> Aniline and homologs | 62-53-3 | 5 | 19 | X |\n\nSource: \n", "cas_number": "62-53-3", "file": "aniline-and-homologs.md", "generated": true, "harvested": "2026-08-05", "id": "aniline-and-homologs", "pel_mgm3": "19", "pel_ppm": "5", "source_quote": "Aniline and homologs | 62-53-3 | 5 | 19 | X |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Aniline and homologs", "title": "Aniline and homologs \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Aniline\n\n**CAS No.:** 62533\n\n**PEL (ppm):** 2\n\n**PEL (mg/m\u00b3):** 7.6\n\n> 62533 | S | Aniline | 2 | 7.6\n\nSource: \n", "cas_number": "62533", "file": "aniline.md", "generated": true, "harvested": "2026-08-05", "id": "aniline", "pel_mgm3": "7.6", "pel_ppm": "2", "source_quote": "62533 | S | Aniline | 2 | 7.6", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Aniline", "title": "Aniline \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Anisidine (o-, p-isomers)\n\n**CAS No.:** 29191-52-4\n\n**PEL (mg/m\u00b3):** 0.5\n\n> Anisidine (o-, p-isomers) | 29191-52-4 | - | 0.5 | X |\n\nSource: \n", "cas_number": "29191-52-4", "file": "anisidine-o-p-isomers.md", "generated": true, "harvested": "2026-08-05", "id": "anisidine-o-p-isomers", "pel_mgm3": "0.5", "source_quote": "Anisidine (o-, p-isomers) | 29191-52-4 | - | 0.5 | X |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Anisidine (o-, p-isomers)", "title": "Anisidine (o-, p-isomers) \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Anisidine (ortho and para isomers)\n\n**CAS No.:** 29191524\n\n**PEL (ppm):** 0.1\n\n**PEL (mg/m\u00b3):** 0.5\n\n> 29191524 | S | Anisidine (ortho and para isomers) | 0.1 | 0.5\n\nSource: \n", "cas_number": "29191524", "file": "anisidine-ortho-and-para-isomers.md", "generated": true, "harvested": "2026-08-05", "id": "anisidine-ortho-and-para-isomers", "pel_mgm3": "0.5", "pel_ppm": "0.1", "source_quote": "29191524 | S | Anisidine (ortho and para isomers) | 0.1 | 0.5", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Anisidine (ortho and para isomers)", "title": "Anisidine (ortho and para isomers) \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Antimony and compounds (as Sb)\n\n**CAS No.:** 7440-36-0\n\n**PEL (mg/m\u00b3):** 0.5\n\n> Antimony and compounds (as Sb) | 7440-36-0 | - | 0.5 | - |\n\nSource: \n", "cas_number": "7440-36-0", "file": "antimony-and-compounds-as-sb.md", "generated": true, "harvested": "2026-08-05", "id": "antimony-and-compounds-as-sb", "pel_mgm3": "0.5", "source_quote": "Antimony and compounds (as Sb) | 7440-36-0 | - | 0.5 | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Antimony and compounds (as Sb)", "title": "Antimony and compounds (as Sb) \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Antimony\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Antimony\n\n**CAS No.:** 7440-36-0\n\n> CAS No. 7440-36-0\n\n**NIOSH REL (mg/m\u00b3):** TWA 0.5\n\n> NIOSH REL TWA 0.5 mg/m3\n\nSource: \n", "cas_number": "7440-36-0", "file": "antimony.md", "generated": true, "harvested": "2026-09-08", "id": "antimony", "quote_cas_number": "CAS No. 7440-36-0", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Antimony", "rel_mgm3": "TWA 0.5", "source_quote": "NIOSH REL TWA 0.5 mg/m3", "sources": ["https://www.cdc.gov/niosh/npg/npgd0036.html"], "stale_after": "2027-09-08", "substance": "Antimony", "title": "Antimony \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** ANTU; 1-(1-naphthyl)-2-thiourea; Bantu; Rattrack\n\n**CAS No.:** 86884\n\n**PEL (mg/m\u00b3):** 0.3\n\n> 86884 | | ANTU; 1-(1-naphthyl)-2-thiourea; Bantu; Rattrack | -- | 0.3\n\nSource: \n", "cas_number": "86884", "file": "antu-1-1-naphthyl-2-thiourea-bantu-rattrack.md", "generated": true, "harvested": "2026-08-05", "id": "antu-1-1-naphthyl-2-thiourea-bantu-rattrack", "pel_mgm3": "0.3", "source_quote": "86884 | | ANTU; 1-(1-naphthyl)-2-thiourea; Bantu; Rattrack | -- | 0.3", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "ANTU; 1-(1-naphthyl)-2-thiourea; Bantu; Rattrack", "title": "ANTU; 1-(1-naphthyl)-2-thiourea; Bantu; Rattrack \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** ANTU (alpha Naphthylthiourea)\n\n**CAS No.:** 86-88-4\n\n**PEL (mg/m\u00b3):** 0.3\n\n> ANTU (alpha Naphthylthiourea) | 86-88-4 | - | 0.3 | - |\n\nSource: \n", "cas_number": "86-88-4", "file": "antu-alpha-naphthylthiourea.md", "generated": true, "harvested": "2026-08-05", "id": "antu-alpha-naphthylthiourea", "pel_mgm3": "0.3", "source_quote": "ANTU (alpha Naphthylthiourea) | 86-88-4 | - | 0.3 | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "ANTU (alpha Naphthylthiourea)", "title": "ANTU (alpha Naphthylthiourea) \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** ANTU\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - ANTU\n\n**CAS No.:** 86-88-4\n\n> CAS No. 86-88-4\n\n**NIOSH REL (mg/m\u00b3):** TWA 0.3\n\n> NIOSH REL TWA 0.3 mg/m3\n\nSource: \n", "cas_number": "86-88-4", "file": "antu.md", "generated": true, "harvested": "2026-09-08", "id": "antu", "quote_cas_number": "CAS No. 86-88-4", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - ANTU", "rel_mgm3": "TWA 0.3", "source_quote": "NIOSH REL TWA 0.3 mg/m3", "sources": ["https://www.cdc.gov/niosh/npg/npgd0037.html"], "stale_after": "2027-09-08", "substance": "ANTU", "title": "ANTU \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Argon\n\n**CAS No.:** 7440371\n\n> 7440371 | | Argon | (h)\n\nSource: \n", "cas_number": "7440371", "file": "argon.md", "generated": true, "harvested": "2026-08-05", "id": "argon", "source_quote": "7440371 | | Argon | (h)", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Argon", "title": "Argon \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Arsenic and inorganic arsenic compounds; see also Section 5214\n\n**CAS No.:** 7440382\n\n**PEL (mg/m\u00b3):** 0.01\n\n> 7440382 | | Arsenic and inorganic arsenic compounds; see also Section 5214 | | 0.01\n\nSource: \n", "cas_number": "7440382", "file": "arsenic-and-inorganic-arsenic-compounds-see-also-section-5214.md", "generated": true, "harvested": "2026-08-05", "id": "arsenic-and-inorganic-arsenic-compounds-see-also-section-5214", "pel_mgm3": "0.01", "source_quote": "7440382 | | Arsenic and inorganic arsenic compounds; see also Section 5214 | | 0.01", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Arsenic and inorganic arsenic compounds; see also Section 5214", "title": "Arsenic and inorganic arsenic compounds; see also Section 5214 \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Arsenic, inorganic compounds (as As); see 1910.1018\n\n**CAS No.:** 7440-38-2\n\n> Arsenic, inorganic compounds (as As); see 1910.1018 | 7440-38-2 | - | - | - |\n\nSource: \n", "cas_number": "7440-38-2", "file": "arsenic-inorganic-compounds-as-as-see-1910-1018.md", "generated": true, "harvested": "2026-08-05", "id": "arsenic-inorganic-compounds-as-as-see-1910-1018", "source_quote": "Arsenic, inorganic compounds (as As); see 1910.1018 | 7440-38-2 | - | - | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Arsenic, inorganic compounds (as As); see 1910.1018", "title": "Arsenic, inorganic compounds (as As); see 1910.1018 \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Arsenic (inorganic compounds, as As)\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Arsenic (inorganic compounds, as As)\n\n**CAS No.:** 7440-38-2 (metal)\n\n> CAS No. 7440-38-2 (metal)\n\n**NIOSH REL (mg/m\u00b3):** C 0.002\n\n> NIOSH REL Ca C 0.002 mg/m3 [15-minute]\n\nSource: \n", "cas_number": "7440-38-2 (metal)", "file": "arsenic-inorganic-compounds-as-as.md", "generated": true, "harvested": "2026-09-08", "id": "arsenic-inorganic-compounds-as-as", "quote_cas_number": "CAS No. 7440-38-2 (metal)", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Arsenic (inorganic compounds, as As)", "rel_mgm3": "C 0.002", "source_quote": "NIOSH REL Ca C 0.002 mg/m3 [15-minute]", "sources": ["https://www.cdc.gov/niosh/npg/npgd0038.html"], "stale_after": "2027-09-08", "substance": "Arsenic (inorganic compounds, as As)", "title": "Arsenic (inorganic compounds, as As) \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Arsenic, organic compounds (as As)\n\n**CAS No.:** 7440-38-2\n\n**PEL (mg/m\u00b3):** 0.5\n\n> Arsenic, organic compounds (as As) | 7440-38-2 | - | 0.5 | - |\n\nSource: \n", "cas_number": "7440-38-2", "file": "arsenic-organic-compounds-as-as.md", "generated": true, "harvested": "2026-08-05", "id": "arsenic-organic-compounds-as-as", "pel_mgm3": "0.5", "source_quote": "Arsenic, organic compounds (as As) | 7440-38-2 | - | 0.5 | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Arsenic, organic compounds (as As)", "title": "Arsenic, organic compounds (as As) \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Arsine\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Arsine\n\n**CAS No.:** 7784-42-1\n\n> CAS No. 7784-42-1\n\n**NIOSH REL (mg/m\u00b3):** C 0.002\n\n> NIOSH REL Ca C 0.002 mg/m3 [15-minute]\n\nSource: \n", "cas_number": "7784-42-1", "file": "arsine-2.md", "generated": true, "harvested": "2026-09-08", "id": "arsine-2", "quote_cas_number": "CAS No. 7784-42-1", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Arsine", "rel_mgm3": "C 0.002", "source_quote": "NIOSH REL Ca C 0.002 mg/m3 [15-minute]", "sources": ["https://www.cdc.gov/niosh/npg/npgd0040.html"], "stale_after": "2027-09-08", "substance": "Arsine", "title": "Arsine \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Arsine; AsH$3\n\n**CAS No.:** 7784421\n\n**PEL (ppm):** 0.05\n\n**PEL (mg/m\u00b3):** 0.2\n\n> 7784421 | | Arsine; AsH$3 | 0.05 | 0.2\n\nSource: \n", "cas_number": "7784421", "file": "arsine-ash-3.md", "generated": true, "harvested": "2026-08-05", "id": "arsine-ash-3", "pel_mgm3": "0.2", "pel_ppm": "0.05", "source_quote": "7784421 | | Arsine; AsH$3 | 0.05 | 0.2", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Arsine; AsH$3", "title": "Arsine; AsH $3 \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Arsine\n\n**CAS No.:** 7784-42-1\n\n**PEL (ppm):** 0.05\n\n**PEL (mg/m\u00b3):** 0.2\n\n> Arsine | 7784-42-1 | 0.05 | 0.2 | - |\n\nSource: \n", "cas_number": "7784-42-1", "file": "arsine.md", "generated": true, "harvested": "2026-08-05", "id": "arsine", "pel_mgm3": "0.2", "pel_ppm": "0.05", "source_quote": "Arsine | 7784-42-1 | 0.05 | 0.2 | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Arsine", "title": "Arsine \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Asbestos\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Asbestos\n\n**CAS No.:** 1332-21-4\n\n> CAS No. 1332-21-4\n\n**NIOSH REL, as stated:** Ca See Appendix A See Appendix C\n\n> NIOSH REL Ca See Appendix A See Appendix C\n\nSource: \n", "cas_number": "1332-21-4", "file": "asbestos.md", "generated": true, "harvested": "2026-09-08", "id": "asbestos", "quote_cas_number": "CAS No. 1332-21-4", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Asbestos", "rel_statement": "Ca See Appendix A See Appendix C", "source_quote": "NIOSH REL Ca See Appendix A See Appendix C", "sources": ["https://www.cdc.gov/niosh/npg/npgd0041.html"], "stale_after": "2027-09-08", "substance": "Asbestos", "title": "Asbestos \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Asphalt fumes\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Asphalt fumes\n\n**CAS No.:** 8052-42-4\n\n> CAS No. 8052-42-4\n\n**NIOSH REL (mg/m\u00b3):** C 5\n\n> NIOSH REL Ca C 5 mg/m3 [15-minute]\n\nSource: \n", "cas_number": "8052-42-4", "file": "asphalt-fumes.md", "generated": true, "harvested": "2026-09-08", "id": "asphalt-fumes", "quote_cas_number": "CAS No. 8052-42-4", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Asphalt fumes", "rel_mgm3": "C 5", "source_quote": "NIOSH REL Ca C 5 mg/m3 [15-minute]", "sources": ["https://www.cdc.gov/niosh/npg/npgd0042.html"], "stale_after": "2027-09-08", "substance": "Asphalt fumes", "title": "Asphalt fumes \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Asphalt (petroleum) fumes\n\n**CAS No.:** 8052424\n\n**PEL (mg/m\u00b3):** 5\n\n> 8052424 | | Asphalt (petroleum) fumes | -- | 5\n\nSource: \n", "cas_number": "8052424", "file": "asphalt-petroleum-fumes.md", "generated": true, "harvested": "2026-08-05", "id": "asphalt-petroleum-fumes", "pel_mgm3": "5", "source_quote": "8052424 | | Asphalt (petroleum) fumes | -- | 5", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Asphalt (petroleum) fumes", "title": "Asphalt (petroleum) fumes \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Atrazine\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Atrazine\n\n**CAS No.:** 1912-24-9\n\n> CAS No. 1912-24-9\n\n**NIOSH REL (mg/m\u00b3):** TWA 5\n\n> NIOSH REL TWA 5 mg/m3\n\nSource: \n", "cas_number": "1912-24-9", "file": "atrazine-2.md", "generated": true, "harvested": "2026-09-08", "id": "atrazine-2", "quote_cas_number": "CAS No. 1912-24-9", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Atrazine", "rel_mgm3": "TWA 5", "source_quote": "NIOSH REL TWA 5 mg/m3", "sources": ["https://www.cdc.gov/niosh/npg/npgd0043.html"], "stale_after": "2027-09-08", "substance": "Atrazine", "title": "Atrazine \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Atrazine\n\n**CAS No.:** 1912249\n\n**PEL (mg/m\u00b3):** 5\n\n> 1912249 | | Atrazine | -- | 5\n\nSource: \n", "cas_number": "1912249", "file": "atrazine.md", "generated": true, "harvested": "2026-08-05", "id": "atrazine", "pel_mgm3": "5", "source_quote": "1912249 | | Atrazine | -- | 5", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Atrazine", "title": "Atrazine \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Azinphos-methyl\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Azinphos-methyl\n\n**CAS No.:** 86-50-0\n\n> CAS No. 86-50-0\n\n**NIOSH REL (mg/m\u00b3):** TWA 0.2\n\n> NIOSH REL TWA 0.2 mg/m3 [skin]\n\nSource: \n", "cas_number": "86-50-0", "file": "azinphos-methyl-2.md", "generated": true, "harvested": "2026-09-08", "id": "azinphos-methyl-2", "quote_cas_number": "CAS No. 86-50-0", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Azinphos-methyl", "rel_mgm3": "TWA 0.2", "source_quote": "NIOSH REL TWA 0.2 mg/m3 [skin]", "sources": ["https://www.cdc.gov/niosh/npg/npgd0681.html"], "stale_after": "2027-09-08", "substance": "Azinphos-methyl", "title": "Azinphos-methyl \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Azinphos methyl; o,o-dimethyl S-(4-oxo-1,2,3-benzotriazin-3(4H)-ylmethyl) phosphorodithioate\n\n**CAS No.:** 86500\n\n**PEL (mg/m\u00b3):** 0.2\n\n> 86500 | S | Azinphos methyl; o,o-dimethyl S-(4-oxo-1,2,3-benzotriazin-3(4H)-ylmethyl) phosphorodithioate | -- | 0.2\n\nSource: \n", "cas_number": "86500", "file": "azinphos-methyl-o-o-dimethyl-s-4-oxo-1-2-3-benzotriazin-3-4h-ylmethyl-phosphorod.md", "generated": true, "harvested": "2026-08-05", "id": "azinphos-methyl-o-o-dimethyl-s-4-oxo-1-2-3-benzotriazin-3-4h-ylmethyl-phosphorod", "pel_mgm3": "0.2", "source_quote": "86500 | S | Azinphos methyl; o,o-dimethyl S-(4-oxo-1,2,3-benzotriazin-3(4H)-ylmethyl) phosphorodithioate | -- | 0.2", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Azinphos methyl; o,o-dimethyl S-(4-oxo-1,2,3-benzotriazin-3(4H)-ylmethyl) phosphorodithioate", "title": "Azinphos methyl; o,o-dimethyl S-(4-oxo-1,2,3-benzotriazin-3(4H)-ylmethyl) phosphorodithioate \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Azinphos-methyl\n\n**CAS No.:** 86-50-0\n\n**PEL (mg/m\u00b3):** 0.2\n\n> Azinphos-methyl | 86-50-0 | - | 0.2 | X |\n\nSource: \n", "cas_number": "86-50-0", "file": "azinphos-methyl.md", "generated": true, "harvested": "2026-08-05", "id": "azinphos-methyl", "pel_mgm3": "0.2", "source_quote": "Azinphos-methyl | 86-50-0 | - | 0.2 | X |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Azinphos-methyl", "title": "Azinphos-methyl \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Barium chloride (as Ba)\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Barium chloride (as Ba)\n\n**CAS No.:** 10361-37-2\n\n> CAS No. 10361-37-2\n\n**NIOSH REL (mg/m\u00b3):** TWA 0.5\n\n> NIOSH REL TWA 0.5 mg/m3\n\nSource: \n", "cas_number": "10361-37-2", "file": "barium-chloride-as-ba.md", "generated": true, "harvested": "2026-09-08", "id": "barium-chloride-as-ba", "quote_cas_number": "CAS No. 10361-37-2", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Barium chloride (as Ba)", "rel_mgm3": "TWA 0.5", "source_quote": "NIOSH REL TWA 0.5 mg/m3", "sources": ["https://www.cdc.gov/niosh/npg/npgd0045.html"], "stale_after": "2027-09-08", "substance": "Barium chloride (as Ba)", "title": "Barium chloride (as Ba) \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Barium nitrate (as Ba)\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Barium nitrate (as Ba)\n\n**CAS No.:** 10022-31-8\n\n> CAS No. 10022-31-8\n\n**NIOSH REL (mg/m\u00b3):** TWA 0.5\n\n> NIOSH REL TWA 0.5 mg/m3\n\nSource: \n", "cas_number": "10022-31-8", "file": "barium-nitrate-as-ba.md", "generated": true, "harvested": "2026-09-08", "id": "barium-nitrate-as-ba", "quote_cas_number": "CAS No. 10022-31-8", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Barium nitrate (as Ba)", "rel_mgm3": "TWA 0.5", "source_quote": "NIOSH REL TWA 0.5 mg/m3", "sources": ["https://www.cdc.gov/niosh/npg/npgd0046.html"], "stale_after": "2027-09-08", "substance": "Barium nitrate (as Ba)", "title": "Barium nitrate (as Ba) \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Barium, soluble compounds, as Ba\n\n**CAS No.:** 7440393\n\n**PEL (mg/m\u00b3):** 0.5\n\n> 7440393 | | Barium, soluble compounds, as Ba | -- | 0.5\n\nSource: \n", "cas_number": "7440393", "file": "barium-soluble-compounds-as-ba-2.md", "generated": true, "harvested": "2026-08-05", "id": "barium-soluble-compounds-as-ba-2", "pel_mgm3": "0.5", "source_quote": "7440393 | | Barium, soluble compounds, as Ba | -- | 0.5", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Barium, soluble compounds, as Ba", "title": "Barium, soluble compounds, as Ba \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Barium, soluble compounds (as Ba)\n\n**CAS No.:** 7440-39-3\n\n**PEL (mg/m\u00b3):** 0.5\n\n> Barium, soluble compounds (as Ba) | 7440-39-3 | - | 0.5 | - |\n\nSource: \n", "cas_number": "7440-39-3", "file": "barium-soluble-compounds-as-ba.md", "generated": true, "harvested": "2026-08-05", "id": "barium-soluble-compounds-as-ba", "pel_mgm3": "0.5", "source_quote": "Barium, soluble compounds (as Ba) | 7440-39-3 | - | 0.5 | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Barium, soluble compounds (as Ba)", "title": "Barium, soluble compounds (as Ba) \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Barium sulfate\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Barium sulfate\n\n**CAS No.:** 7727-43-7\n\n> CAS No. 7727-43-7\n\n**NIOSH REL, as stated:** TWA 10 mg/m3 (total) TWA 5 mg/m3 (resp)\n\n> NIOSH REL TWA 10 mg/m3 (total) TWA 5 mg/m3 (resp)\n\nSource: \n", "cas_number": "7727-43-7", "file": "barium-sulfate-2.md", "generated": true, "harvested": "2026-09-08", "id": "barium-sulfate-2", "quote_cas_number": "CAS No. 7727-43-7", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Barium sulfate", "rel_statement": "TWA 10 mg/m3 (total) TWA 5 mg/m3 (resp)", "source_quote": "NIOSH REL TWA 10 mg/m3 (total) TWA 5 mg/m3 (resp)", "sources": ["https://www.cdc.gov/niosh/npg/npgd0047.html"], "stale_after": "2027-09-08", "substance": "Barium sulfate", "title": "Barium sulfate \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Barium sulfate; see Particulates not otherwise regulated\n\n**CAS No.:** 7727437\n\n> 7727437 | | Barium sulfate; see Particulates not otherwise regulated\n\nSource: \n", "cas_number": "7727437", "file": "barium-sulfate-see-particulates-not-otherwise-regulated.md", "generated": true, "harvested": "2026-08-05", "id": "barium-sulfate-see-particulates-not-otherwise-regulated", "source_quote": "7727437 | | Barium sulfate; see Particulates not otherwise regulated", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Barium sulfate; see Particulates not otherwise regulated", "title": "Barium sulfate; see Particulates not otherwise regulated \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Barium sulfate\n\n**CAS No.:** 7727-43-7\n\n> Barium sulfate | 7727-43-7 | - | - | - |\n\nSource: \n", "cas_number": "7727-43-7", "file": "barium-sulfate.md", "generated": true, "harvested": "2026-08-05", "id": "barium-sulfate", "source_quote": "Barium sulfate | 7727-43-7 | - | - | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Barium sulfate", "title": "Barium sulfate \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Benomyl\n\n**CAS No.:** 17804352\n\n> 17804352 | | Benomyl\n\nSource: \n", "cas_number": "17804352", "file": "benomyl-2.md", "generated": true, "harvested": "2026-08-05", "id": "benomyl-2", "source_quote": "17804352 | | Benomyl", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Benomyl", "title": "Benomyl \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Benomyl\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Benomyl\n\n**CAS No.:** 17804-35-2\n\n> CAS No. 17804-35-2\n\n**NIOSH REL, as stated:** See Appendix D\n\n> NIOSH REL See Appendix D\n\nSource: \n", "cas_number": "17804-35-2", "file": "benomyl-3.md", "generated": true, "harvested": "2026-09-08", "id": "benomyl-3", "quote_cas_number": "CAS No. 17804-35-2", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Benomyl", "rel_statement": "See Appendix D", "source_quote": "NIOSH REL See Appendix D", "sources": ["https://www.cdc.gov/niosh/npg/npgd0048.html"], "stale_after": "2027-09-08", "substance": "Benomyl", "title": "Benomyl \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Benomyl\n\n**CAS No.:** 17804-35-2\n\n> Benomyl | 17804-35-2 | - | - | - |\n\nSource: \n", "cas_number": "17804-35-2", "file": "benomyl.md", "generated": true, "harvested": "2026-08-05", "id": "benomyl", "source_quote": "Benomyl | 17804-35-2 | - | - | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Benomyl", "title": "Benomyl \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Benzene; see 1910.1028\n\n**CAS No.:** 71-43-2\n\n> Benzene; see 1910.1028 | 71-43-2 | - | - | - |\n\nSource: \n", "cas_number": "71-43-2", "file": "benzene-see-1910-1028.md", "generated": true, "harvested": "2026-08-05", "id": "benzene-see-1910-1028", "source_quote": "Benzene; see 1910.1028 | 71-43-2 | - | - | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Benzene; see 1910.1028", "title": "Benzene; see 1910.1028 \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Benzene; see also Section 5218\n\n**CAS No.:** 71432\n\n**PEL (ppm):** 1\n\n**STEL (ppm):** 5\n\n> 71432 | S | Benzene; see also Section 5218 | 1 | | | 5 | --\n\nSource: \n", "cas_number": "71432", "file": "benzene-see-also-section-5218.md", "generated": true, "harvested": "2026-08-05", "id": "benzene-see-also-section-5218", "pel_ppm": "1", "source_quote": "71432 | S | Benzene; see also Section 5218 | 1 | | | 5 | --", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "stel_ppm": "5", "substance": "Benzene; see also Section 5218", "title": "Benzene; see also Section 5218 \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Benzene\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Benzene\n\n**CAS No.:** 71-43-2\n\n> CAS No. 71-43-2\n\n**NIOSH REL (ppm):** TWA 0.1\n\n> NIOSH REL Ca TWA 0.1 ppm ST 1 ppm\n\nSource: \n", "cas_number": "71-43-2", "file": "benzene.md", "generated": true, "harvested": "2026-09-08", "id": "benzene", "quote_cas_number": "CAS No. 71-43-2", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Benzene", "rel_ppm": "TWA 0.1", "source_quote": "NIOSH REL Ca TWA 0.1 ppm ST 1 ppm", "sources": ["https://www.cdc.gov/niosh/npg/npgd0049.html"], "stale_after": "2027-09-08", "substance": "Benzene", "title": "Benzene \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Benzenethiol\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Benzenethiol\n\n**CAS No.:** 108-98-5\n\n> CAS No. 108-98-5\n\n**NIOSH REL (ppm):** C 0.1\n\n**NIOSH REL (mg/m\u00b3):** 0.5\n\n> NIOSH REL C 0.1 ppm (0.5 mg/m3) [15-minute]\n\nSource: \n", "cas_number": "108-98-5", "file": "benzenethiol.md", "generated": true, "harvested": "2026-09-08", "id": "benzenethiol", "quote_cas_number": "CAS No. 108-98-5", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Benzenethiol", "rel_mgm3": "0.5", "rel_ppm": "C 0.1", "source_quote": "NIOSH REL C 0.1 ppm (0.5 mg/m3) [15-minute]", "sources": ["https://www.cdc.gov/niosh/npg/npgd0050.html"], "stale_after": "2027-09-08", "substance": "Benzenethiol", "title": "Benzenethiol \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Benzidine; 4,4\u2032-diaminobiphenyl, see Section 5209\n\n**CAS No.:** 92875\n\n> 92875 | S | Benzidine; 4,4\u2032-diaminobiphenyl, see Section 5209\n\nSource: \n", "cas_number": "92875", "file": "benzidine-4-4-diaminobiphenyl-see-section-5209.md", "generated": true, "harvested": "2026-08-05", "id": "benzidine-4-4-diaminobiphenyl-see-section-5209", "source_quote": "92875 | S | Benzidine; 4,4\u2032-diaminobiphenyl, see Section 5209", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Benzidine; 4,4\u2032-diaminobiphenyl, see Section 5209", "title": "Benzidine; 4,4\u2032-diaminobiphenyl, see Section 5209 \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Benzidine; see 1910.1010\n\n**CAS No.:** 92-87-5\n\n> Benzidine; see 1910.1010 | 92-87-5 | - | - | - |\n\nSource: \n", "cas_number": "92-87-5", "file": "benzidine-see-1910-1010.md", "generated": true, "harvested": "2026-08-05", "id": "benzidine-see-1910-1010", "source_quote": "Benzidine; see 1910.1010 | 92-87-5 | - | - | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Benzidine; see 1910.1010", "title": "Benzidine; see 1910.1010 \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Benzidine\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Benzidine\n\n**CAS No.:** 92-87-5\n\n> CAS No. 92-87-5\n\n**NIOSH REL, as stated:** Ca See Appendix A See Appendix C\n\n> NIOSH REL Ca See Appendix A See Appendix C\n\nSource: \n", "cas_number": "92-87-5", "file": "benzidine.md", "generated": true, "harvested": "2026-09-08", "id": "benzidine", "quote_cas_number": "CAS No. 92-87-5", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Benzidine", "rel_statement": "Ca See Appendix A See Appendix C", "source_quote": "NIOSH REL Ca See Appendix A See Appendix C", "sources": ["https://www.cdc.gov/niosh/npg/npgd0051.html"], "stale_after": "2027-09-08", "substance": "Benzidine", "title": "Benzidine \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Benzol; see Benzene\n\n**CAS No.:** 71432\n\n> 71432 | | Benzol; see Benzene\n\nSource: \n", "cas_number": "71432", "file": "benzol-see-benzene.md", "generated": true, "harvested": "2026-08-05", "id": "benzol-see-benzene", "source_quote": "71432 | | Benzol; see Benzene", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Benzol; see Benzene", "title": "Benzol; see Benzene \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Benzoyl chloride\n\n**CAS No.:** 98884\n\n**PEL (ppm):** 0.2\n\n**PEL (mg/m\u00b3):** 1.1\n\n**Ceiling:** C\n\n> 98884 | | Benzoyl chloride | 0.2 | 1.1 | C\n\nSource: \n", "cas_number": "98884", "ceiling": "C", "file": "benzoyl-chloride.md", "generated": true, "harvested": "2026-08-05", "id": "benzoyl-chloride", "pel_mgm3": "1.1", "pel_ppm": "0.2", "source_quote": "98884 | | Benzoyl chloride | 0.2 | 1.1 | C", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Benzoyl chloride", "title": "Benzoyl chloride \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Benzoyl peroxide\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Benzoyl peroxide\n\n**CAS No.:** 94-36-0\n\n> CAS No. 94-36-0\n\n**NIOSH REL (mg/m\u00b3):** TWA 5\n\n> NIOSH REL TWA 5 mg/m3\n\nSource: \n", "cas_number": "94-36-0", "file": "benzoyl-peroxide-2.md", "generated": true, "harvested": "2026-09-08", "id": "benzoyl-peroxide-2", "quote_cas_number": "CAS No. 94-36-0", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Benzoyl peroxide", "rel_mgm3": "TWA 5", "source_quote": "NIOSH REL TWA 5 mg/m3", "sources": ["https://www.cdc.gov/niosh/npg/npgd0052.html"], "stale_after": "2027-09-08", "substance": "Benzoyl peroxide", "title": "Benzoyl peroxide \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Benzoyl peroxide; dibenzoyl peroxide\n\n**CAS No.:** 94360\n\n**PEL (mg/m\u00b3):** 5\n\n> 94360 | | Benzoyl peroxide; dibenzoyl peroxide | -- | 5\n\nSource: \n", "cas_number": "94360", "file": "benzoyl-peroxide-dibenzoyl-peroxide.md", "generated": true, "harvested": "2026-08-05", "id": "benzoyl-peroxide-dibenzoyl-peroxide", "pel_mgm3": "5", "source_quote": "94360 | | Benzoyl peroxide; dibenzoyl peroxide | -- | 5", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Benzoyl peroxide; dibenzoyl peroxide", "title": "Benzoyl peroxide; dibenzoyl peroxide \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Benzoyl peroxide\n\n**CAS No.:** 94-36-0\n\n**PEL (mg/m\u00b3):** 5\n\n> Benzoyl peroxide | 94-36-0 | - | 5 | - |\n\nSource: \n", "cas_number": "94-36-0", "file": "benzoyl-peroxide.md", "generated": true, "harvested": "2026-08-05", "id": "benzoyl-peroxide", "pel_mgm3": "5", "source_quote": "Benzoyl peroxide | 94-36-0 | - | 5 | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Benzoyl peroxide", "title": "Benzoyl peroxide \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Benzyl acetate\n\n**CAS No.:** 140114\n\n**PEL (ppm):** 10\n\n**PEL (mg/m\u00b3):** 61\n\n> 140114 | | Benzyl acetate | 10 | 61\n\nSource: \n", "cas_number": "140114", "file": "benzyl-acetate.md", "generated": true, "harvested": "2026-08-05", "id": "benzyl-acetate", "pel_mgm3": "61", "pel_ppm": "10", "source_quote": "140114 | | Benzyl acetate | 10 | 61", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Benzyl acetate", "title": "Benzyl acetate \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Benzyl chloride\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Benzyl chloride\n\n**CAS No.:** 100-44-7\n\n> CAS No. 100-44-7\n\n**NIOSH REL (ppm):** C 1\n\n**NIOSH REL (mg/m\u00b3):** 5\n\n> NIOSH REL C 1 ppm (5 mg/m3) [15-minute]\n\nSource: \n", "cas_number": "100-44-7", "file": "benzyl-chloride-2.md", "generated": true, "harvested": "2026-09-08", "id": "benzyl-chloride-2", "quote_cas_number": "CAS No. 100-44-7", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Benzyl chloride", "rel_mgm3": "5", "rel_ppm": "C 1", "source_quote": "NIOSH REL C 1 ppm (5 mg/m3) [15-minute]", "sources": ["https://www.cdc.gov/niosh/npg/npgd0053.html"], "stale_after": "2027-09-08", "substance": "Benzyl chloride", "title": "Benzyl chloride \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** benzyl chloride; alpha-chlorotoluene\n\n**CAS No.:** 100447\n\n**PEL (ppm):** 0.03\n\n**PEL (mg/m\u00b3):** 0.16\n\n> 100447 | | benzyl chloride; alpha-chlorotoluene | 0.03 | 0.16\n\nSource: \n", "cas_number": "100447", "file": "benzyl-chloride-alpha-chlorotoluene.md", "generated": true, "harvested": "2026-08-05", "id": "benzyl-chloride-alpha-chlorotoluene", "pel_mgm3": "0.16", "pel_ppm": "0.03", "source_quote": "100447 | | benzyl chloride; alpha-chlorotoluene | 0.03 | 0.16", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "benzyl chloride; alpha-chlorotoluene", "title": "benzyl chloride; alpha-chlorotoluene \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Benzyl chloride\n\n**CAS No.:** 100-44-7\n\n**PEL (ppm):** 1\n\n**PEL (mg/m\u00b3):** 5\n\n> Benzyl chloride | 100-44-7 | 1 | 5 | - |\n\nSource: \n", "cas_number": "100-44-7", "file": "benzyl-chloride.md", "generated": true, "harvested": "2026-08-05", "id": "benzyl-chloride", "pel_mgm3": "5", "pel_ppm": "1", "source_quote": "Benzyl chloride | 100-44-7 | 1 | 5 | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Benzyl chloride", "title": "Benzyl chloride \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Beryllium and beryllium compounds (as Be); see 1926.1124 8\n\n**CAS No.:** 7440-41-7\n\n> Beryllium and beryllium compounds (as Be); see 1926.1124 8 | 7440-41-7 | - | - | - |\n\nSource: \n", "cas_number": "7440-41-7", "file": "beryllium-and-beryllium-compounds-as-be-see-1926-1124-8.md", "generated": true, "harvested": "2026-08-05", "id": "beryllium-and-beryllium-compounds-as-be-see-1926-1124-8", "source_quote": "Beryllium and beryllium compounds (as Be); see 1926.1124 8 | 7440-41-7 | - | - | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Beryllium and beryllium compounds (as Be); see 1926.1124 8", "title": "Beryllium and beryllium compounds (as Be); see 1926.1124 8 \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Beryllium, and beryllium compounds\n\n**CAS No.:** 7440417\n\n**PEL (mg/m\u00b3):** 0.0002\n\n**Ceiling:** 0.025mg/M3\n\n**STEL (mg/m\u00b3):** 0.002\n\n> 7440417 | | Beryllium, and beryllium compounds | -- | 0.0002 | 0.025mg/M3 | -- | 0.002\n\nSource: \n", "cas_number": "7440417", "ceiling": "0.025mg/M3", "file": "beryllium-and-beryllium-compounds.md", "generated": true, "harvested": "2026-08-05", "id": "beryllium-and-beryllium-compounds", "pel_mgm3": "0.0002", "source_quote": "7440417 | | Beryllium, and beryllium compounds | -- | 0.0002 | 0.025mg/M3 | -- | 0.002", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "stel_mgm3": "0.002", "substance": "Beryllium, and beryllium compounds", "title": "Beryllium, and beryllium compounds \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Beryllium & beryllium compounds (as Be)\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Beryllium & beryllium compounds (as Be)\n\n**CAS No.:** 7440-41-7 (metal)\n\n> CAS No. 7440-41-7 (metal)\n\n**NIOSH REL, as stated:** Ca See Appendix A\n\n> NIOSH REL Ca See Appendix A\n\nSource: \n", "cas_number": "7440-41-7 (metal)", "file": "beryllium-beryllium-compounds-as-be.md", "generated": true, "harvested": "2026-09-08", "id": "beryllium-beryllium-compounds-as-be", "quote_cas_number": "CAS No. 7440-41-7 (metal)", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Beryllium & beryllium compounds (as Be)", "rel_statement": "Ca See Appendix A", "source_quote": "NIOSH REL Ca See Appendix A", "sources": ["https://www.cdc.gov/niosh/npg/npgd0054.html"], "stale_after": "2027-09-08", "substance": "Beryllium & beryllium compounds (as Be)", "title": "Beryllium & beryllium compounds (as Be) \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** beta-Chloroprene\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - beta-Chloroprene\n\n**CAS No.:** 126-99-8\n\n> CAS No. 126-99-8\n\n**NIOSH REL (ppm):** C 1\n\n**NIOSH REL (mg/m\u00b3):** 3.6\n\n> NIOSH REL Ca C 1 ppm (3.6 mg/m3) [15-minute]\n\nSource: \n", "cas_number": "126-99-8", "file": "beta-chloroprene-2.md", "generated": true, "harvested": "2026-09-08", "id": "beta-chloroprene-2", "quote_cas_number": "CAS No. 126-99-8", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - beta-Chloroprene", "rel_mgm3": "3.6", "rel_ppm": "C 1", "source_quote": "NIOSH REL Ca C 1 ppm (3.6 mg/m3) [15-minute]", "sources": ["https://www.cdc.gov/niosh/npg/npgd0133.html"], "stale_after": "2027-09-08", "substance": "beta-Chloroprene", "title": "beta-Chloroprene \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** beta-Chloroprene\n\n**CAS No.:** 126-99-8\n\n**PEL (ppm):** 25\n\n**PEL (mg/m\u00b3):** 90\n\n> beta-Chloroprene | 126-99-8 | 25 | 90 | X |\n\nSource: \n", "cas_number": "126-99-8", "file": "beta-chloroprene.md", "generated": true, "harvested": "2026-08-05", "id": "beta-chloroprene", "pel_mgm3": "90", "pel_ppm": "25", "source_quote": "beta-Chloroprene | 126-99-8 | 25 | 90 | X |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "beta-Chloroprene", "title": "beta-Chloroprene \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** beta-Naphthylamine; 2-naphthylamine, see Section 5209\n\n**CAS No.:** 91598\n\n> 91598 | | beta-Naphthylamine; 2-naphthylamine, see Section 5209\n\nSource: \n", "cas_number": "91598", "file": "beta-naphthylamine-2-naphthylamine-see-section-5209.md", "generated": true, "harvested": "2026-08-05", "id": "beta-naphthylamine-2-naphthylamine-see-section-5209", "source_quote": "91598 | | beta-Naphthylamine; 2-naphthylamine, see Section 5209", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "beta-Naphthylamine; 2-naphthylamine, see Section 5209", "title": "beta-Naphthylamine; 2-naphthylamine, see Section 5209 \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** beta-Naphthylamine; see 1910.1009\n\n**CAS No.:** 91-59-8\n\n> beta-Naphthylamine; see 1910.1009 | 91-59-8 | - | - | - |\n\nSource: \n", "cas_number": "91-59-8", "file": "beta-naphthylamine-see-1910-1009.md", "generated": true, "harvested": "2026-08-05", "id": "beta-naphthylamine-see-1910-1009", "source_quote": "beta-Naphthylamine; see 1910.1009 | 91-59-8 | - | - | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "beta-Naphthylamine; see 1910.1009", "title": "beta-Naphthylamine; see 1910.1009 \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** beta-Naphthylamine\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - beta-Naphthylamine\n\n**CAS No.:** 91-59-8\n\n> CAS No. 91-59-8\n\n**NIOSH REL, as stated:** Ca See Appendix A\n\n> NIOSH REL Ca See Appendix A\n\nSource: \n", "cas_number": "91-59-8", "file": "beta-naphthylamine.md", "generated": true, "harvested": "2026-09-08", "id": "beta-naphthylamine", "quote_cas_number": "CAS No. 91-59-8", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - beta-Naphthylamine", "rel_statement": "Ca See Appendix A", "source_quote": "NIOSH REL Ca See Appendix A", "sources": ["https://www.cdc.gov/niosh/npg/npgd0442.html"], "stale_after": "2027-09-08", "substance": "beta-Naphthylamine", "title": "beta-Naphthylamine \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** beta-Propiolactone, see Section 5209\n\n**CAS No.:** 57578\n\n**PEL (ppm):** 0.5\n\n**PEL (mg/m\u00b3):** 1.5\n\n> 57578 | | beta-Propiolactone, see Section 5209 | 0.5 | 1.5\n\nSource: \n", "cas_number": "57578", "file": "beta-propiolactone-see-section-5209.md", "generated": true, "harvested": "2026-08-05", "id": "beta-propiolactone-see-section-5209", "pel_mgm3": "1.5", "pel_ppm": "0.5", "source_quote": "57578 | | beta-Propiolactone, see Section 5209 | 0.5 | 1.5", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "beta-Propiolactone, see Section 5209", "title": "beta-Propiolactone, see Section 5209 \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** beta-Propiolactone\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - beta-Propiolactone\n\n**CAS No.:** 57-57-8\n\n> CAS No. 57-57-8\n\n**NIOSH REL, as stated:** Ca See Appendix A\n\n> NIOSH REL Ca See Appendix A\n\nSource: \n", "cas_number": "57-57-8", "file": "beta-propiolactone.md", "generated": true, "harvested": "2026-09-08", "id": "beta-propiolactone", "quote_cas_number": "CAS No. 57-57-8", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - beta-Propiolactone", "rel_statement": "Ca See Appendix A", "source_quote": "NIOSH REL Ca See Appendix A", "sources": ["https://www.cdc.gov/niosh/npg/npgd0528.html"], "stale_after": "2027-09-08", "substance": "beta-Propiolactone", "title": "beta-Propiolactone \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** beta-Propriolactone; see 1910.1013\n\n**CAS No.:** 57-57-8\n\n> beta-Propriolactone; see 1910.1013 | 57-57-8 | - | - | - |\n\nSource: \n", "cas_number": "57-57-8", "file": "beta-propriolactone-see-1910-1013.md", "generated": true, "harvested": "2026-08-05", "id": "beta-propriolactone-see-1910-1013", "source_quote": "beta-Propriolactone; see 1910.1013 | 57-57-8 | - | - | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "beta-Propriolactone; see 1910.1013", "title": "beta-Propriolactone; see 1910.1013 \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Biphenyl; diphenyl; phenylbenzene\n\n**CAS No.:** 92524\n\n**PEL (ppm):** 0.2\n\n**PEL (mg/m\u00b3):** 1.5\n\n> 92524 | | Biphenyl; diphenyl; phenylbenzene | 0.2 | 1.5\n\nSource: \n", "cas_number": "92524", "file": "biphenyl-diphenyl-phenylbenzene.md", "generated": true, "harvested": "2026-08-05", "id": "biphenyl-diphenyl-phenylbenzene", "pel_mgm3": "1.5", "pel_ppm": "0.2", "source_quote": "92524 | | Biphenyl; diphenyl; phenylbenzene | 0.2 | 1.5", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Biphenyl; diphenyl; phenylbenzene", "title": "Biphenyl; diphenyl; phenylbenzene \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** bis(2-(Dimethylamino)ethyl)ether\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - bis(2-(Dimethylamino)ethyl)ether\n\n**CAS No.:** 3033-62-3\n\n> CAS No. 3033-62-3\n\n**NIOSH REL, as stated:** See Appendix C (NIAX\u00ae Catalyst ESN)\n\n> NIOSH REL See Appendix C (NIAX\u00ae Catalyst ESN)\n\nSource: \n", "cas_number": "3033-62-3", "file": "bis-2-dimethylamino-ethyl-ether.md", "generated": true, "harvested": "2026-09-08", "id": "bis-2-dimethylamino-ethyl-ether", "quote_cas_number": "CAS No. 3033-62-3", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - bis(2-(Dimethylamino)ethyl)ether", "rel_statement": "See Appendix C (NIAX\u00ae Catalyst ESN)", "source_quote": "NIOSH REL See Appendix C (NIAX\u00ae Catalyst ESN)", "sources": ["https://www.cdc.gov/niosh/npg/npgd0221.html"], "stale_after": "2027-09-08", "substance": "bis(2-(Dimethylamino)ethyl)ether", "title": "bis(2-(Dimethylamino)ethyl)ether \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** bis(Chloromethyl) ether; see 1910.1008\n\n**CAS No.:** 542-88-1\n\n> bis(Chloromethyl) ether; see 1910.1008 | 542-88-1 | - | - | - |\n\nSource: \n", "cas_number": "542-88-1", "file": "bis-chloromethyl-ether-see-1910-1008.md", "generated": true, "harvested": "2026-08-05", "id": "bis-chloromethyl-ether-see-1910-1008", "source_quote": "bis(Chloromethyl) ether; see 1910.1008 | 542-88-1 | - | - | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "bis(Chloromethyl) ether; see 1910.1008", "title": "bis(Chloromethyl) ether; see 1910.1008 \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** bis-Chloromethyl ether, see also Section 5209\n\n**CAS No.:** 542881\n\n**PEL (ppm):** 0.001\n\n**PEL (mg/m\u00b3):** 0.005\n\n> 542881 | | bis-Chloromethyl ether, see also Section 5209 | 0.001 | 0.005\n\nSource: \n", "cas_number": "542881", "file": "bis-chloromethyl-ether-see-also-section-5209.md", "generated": true, "harvested": "2026-08-05", "id": "bis-chloromethyl-ether-see-also-section-5209", "pel_mgm3": "0.005", "pel_ppm": "0.001", "source_quote": "542881 | | bis-Chloromethyl ether, see also Section 5209 | 0.001 | 0.005", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "bis-Chloromethyl ether, see also Section 5209", "title": "bis-Chloromethyl ether, see also Section 5209 \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Bis(chloromethyl) ether, see bis-Chloromethyl ether, Section 5209\n\n**CAS No.:** 542881\n\n> 542881 | | Bis(chloromethyl) ether, see bis-Chloromethyl ether, Section 5209\n\nSource: \n", "cas_number": "542881", "file": "bis-chloromethyl-ether-see-bis-chloromethyl-ether-section-5209.md", "generated": true, "harvested": "2026-08-05", "id": "bis-chloromethyl-ether-see-bis-chloromethyl-ether-section-5209", "source_quote": "542881 | | Bis(chloromethyl) ether, see bis-Chloromethyl ether, Section 5209", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Bis(chloromethyl) ether, see bis-Chloromethyl ether, Section 5209", "title": "Bis(chloromethyl) ether, see bis-Chloromethyl ether, Section 5209 \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** bis-Chloromethyl ether\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - bis-Chloromethyl ether\n\n**CAS No.:** 542-88-1\n\n> CAS No. 542-88-1\n\n**NIOSH REL, as stated:** Ca See Appendix A\n\n> NIOSH REL Ca See Appendix A\n\nSource: \n", "cas_number": "542-88-1", "file": "bis-chloromethyl-ether.md", "generated": true, "harvested": "2026-09-08", "id": "bis-chloromethyl-ether", "quote_cas_number": "CAS No. 542-88-1", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - bis-Chloromethyl ether", "rel_statement": "Ca See Appendix A", "source_quote": "NIOSH REL Ca See Appendix A", "sources": ["https://www.cdc.gov/niosh/npg/npgd0128.html"], "stale_after": "2027-09-08", "substance": "bis-Chloromethyl ether", "title": "bis-Chloromethyl ether \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Bis (Dimethylaminoethyl) ether (DMAEE)\n\n**CAS No.:** 3033623\n\n**PEL (ppm):** 0.05\n\n**PEL (mg/m\u00b3):** 0.328\n\n**STEL (ppm):** 0.15\n\n**STEL (mg/m\u00b3):** 0.983\n\n> 3033623 | S | Bis (Dimethylaminoethyl) ether (DMAEE) | 0.05 | 0.328 | | 0.15 | 0.983\n\nSource: \n", "cas_number": "3033623", "file": "bis-dimethylaminoethyl-ether-dmaee.md", "generated": true, "harvested": "2026-08-05", "id": "bis-dimethylaminoethyl-ether-dmaee", "pel_mgm3": "0.328", "pel_ppm": "0.05", "source_quote": "3033623 | S | Bis (Dimethylaminoethyl) ether (DMAEE) | 0.05 | 0.328 | | 0.15 | 0.983", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "stel_mgm3": "0.983", "stel_ppm": "0.15", "substance": "Bis (Dimethylaminoethyl) ether (DMAEE)", "title": "Bis (Dimethylaminoethyl) ether (DMAEE) \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Bismuth telluride, undoped\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Bismuth telluride, undoped\n\n**CAS No.:** 1304-82-1\n\n> CAS No. 1304-82-1\n\n**NIOSH REL, as stated:** TWA 10 mg/m3 (total) TWA 5 mg/m3 (resp)\n\n> NIOSH REL TWA 10 mg/m3 (total) TWA 5 mg/m3 (resp)\n\nSource: \n", "cas_number": "1304-82-1", "file": "bismuth-telluride-undoped-2.md", "generated": true, "harvested": "2026-09-08", "id": "bismuth-telluride-undoped-2", "quote_cas_number": "CAS No. 1304-82-1", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Bismuth telluride, undoped", "rel_statement": "TWA 10 mg/m3 (total) TWA 5 mg/m3 (resp)", "source_quote": "NIOSH REL TWA 10 mg/m3 (total) TWA 5 mg/m3 (resp)", "sources": ["https://www.cdc.gov/niosh/npg/npgd0056.html"], "stale_after": "2027-09-08", "substance": "Bismuth telluride, undoped", "title": "Bismuth telluride, undoped \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Bismuth telluride, Undoped\n\n**CAS No.:** 1304-82-1\n\n> Bismuth telluride, Undoped | 1304-82-1 | - | - | - |\n\nSource: \n", "cas_number": "1304-82-1", "file": "bismuth-telluride-undoped.md", "generated": true, "harvested": "2026-08-05", "id": "bismuth-telluride-undoped", "source_quote": "Bismuth telluride, Undoped | 1304-82-1 | - | - | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Bismuth telluride, Undoped", "title": "Bismuth telluride, Undoped \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Bismuth telluride\n\n**CAS No.:** 1304821\n\n> 1304821 | | Bismuth telluride\n\nSource: \n", "cas_number": "1304821", "file": "bismuth-telluride.md", "generated": true, "harvested": "2026-08-05", "id": "bismuth-telluride", "source_quote": "1304821 | | Bismuth telluride", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Bismuth telluride", "title": "Bismuth telluride \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Borates, tetra, sodium salts (Anhydrous)\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Borates, tetra, sodium salts (Anhydrous)\n\n**CAS No.:** 1330-43-4\n\n> CAS No. 1330-43-4\n\n**NIOSH REL (mg/m\u00b3):** TWA 1\n\n> NIOSH REL TWA 1 mg/m3\n\nSource: \n", "cas_number": "1330-43-4", "file": "borates-tetra-sodium-salts-anhydrous.md", "generated": true, "harvested": "2026-09-08", "id": "borates-tetra-sodium-salts-anhydrous", "quote_cas_number": "CAS No. 1330-43-4", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Borates, tetra, sodium salts (Anhydrous)", "rel_mgm3": "TWA 1", "source_quote": "NIOSH REL TWA 1 mg/m3", "sources": ["https://www.cdc.gov/niosh/npg/npgd0057.html"], "stale_after": "2027-09-08", "substance": "Borates, tetra, sodium salts (Anhydrous)", "title": "Borates, tetra, sodium salts (Anhydrous) \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Borates, tetra, sodium salts (Decahydrate)\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Borates, tetra, sodium salts (Decahydrate)\n\n**CAS No.:** 1303-96-4\n\n> CAS No. 1303-96-4\n\n**NIOSH REL (mg/m\u00b3):** TWA 5\n\n> NIOSH REL TWA 5 mg/m3\n\nSource: \n", "cas_number": "1303-96-4", "file": "borates-tetra-sodium-salts-decahydrate.md", "generated": true, "harvested": "2026-09-08", "id": "borates-tetra-sodium-salts-decahydrate", "quote_cas_number": "CAS No. 1303-96-4", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Borates, tetra, sodium salts (Decahydrate)", "rel_mgm3": "TWA 5", "source_quote": "NIOSH REL TWA 5 mg/m3", "sources": ["https://www.cdc.gov/niosh/npg/npgd0058.html"], "stale_after": "2027-09-08", "substance": "Borates, tetra, sodium salts (Decahydrate)", "title": "Borates, tetra, sodium salts (Decahydrate) \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Borates, tetra, sodium salts (Pentahydrate)\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Borates, tetra, sodium salts (Pentahydrate)\n\n**CAS No.:** 12179-04-3\n\n> CAS No. 12179-04-3\n\n**NIOSH REL (mg/m\u00b3):** TWA 1\n\n> NIOSH REL TWA 1 mg/m3\n\nSource: \n", "cas_number": "12179-04-3", "file": "borates-tetra-sodium-salts-pentahydrate.md", "generated": true, "harvested": "2026-09-08", "id": "borates-tetra-sodium-salts-pentahydrate", "quote_cas_number": "CAS No. 12179-04-3", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Borates, tetra, sodium salts (Pentahydrate)", "rel_mgm3": "TWA 1", "source_quote": "NIOSH REL TWA 1 mg/m3", "sources": ["https://www.cdc.gov/niosh/npg/npgd0059.html"], "stale_after": "2027-09-08", "substance": "Borates, tetra, sodium salts (Pentahydrate)", "title": "Borates, tetra, sodium salts (Pentahydrate) \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Boron oxide\n\n**CAS No.:** 1303862\n\n**PEL (mg/m\u00b3):** 10\n\n> 1303862 | | Boron oxide | -- | 10\n\nSource: \n", "cas_number": "1303862", "file": "boron-oxide-2.md", "generated": true, "harvested": "2026-08-05", "id": "boron-oxide-2", "pel_mgm3": "10", "source_quote": "1303862 | | Boron oxide | -- | 10", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Boron oxide", "title": "Boron oxide \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Boron oxide\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Boron oxide\n\n**CAS No.:** 1303-86-2\n\n> CAS No. 1303-86-2\n\n**NIOSH REL (mg/m\u00b3):** TWA 10\n\n> NIOSH REL TWA 10 mg/m3\n\nSource: \n", "cas_number": "1303-86-2", "file": "boron-oxide-3.md", "generated": true, "harvested": "2026-09-08", "id": "boron-oxide-3", "quote_cas_number": "CAS No. 1303-86-2", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Boron oxide", "rel_mgm3": "TWA 10", "source_quote": "NIOSH REL TWA 10 mg/m3", "sources": ["https://www.cdc.gov/niosh/npg/npgd0060.html"], "stale_after": "2027-09-08", "substance": "Boron oxide", "title": "Boron oxide \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Boron oxide\n\n**CAS No.:** 1303-86-2\n\n> Boron oxide | 1303-86-2 | - | - | - |\n\nSource: \n", "cas_number": "1303-86-2", "file": "boron-oxide.md", "generated": true, "harvested": "2026-08-05", "id": "boron-oxide", "source_quote": "Boron oxide | 1303-86-2 | - | - | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Boron oxide", "title": "Boron oxide \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Boron tribromide\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Boron tribromide\n\n**CAS No.:** 10294-33-4\n\n> CAS No. 10294-33-4\n\n**NIOSH REL (ppm):** C 1\n\n**NIOSH REL (mg/m\u00b3):** 10\n\n> NIOSH REL C 1 ppm (10 mg/m3)\n\nSource: \n", "cas_number": "10294-33-4", "file": "boron-tribromide-2.md", "generated": true, "harvested": "2026-09-08", "id": "boron-tribromide-2", "quote_cas_number": "CAS No. 10294-33-4", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Boron tribromide", "rel_mgm3": "10", "rel_ppm": "C 1", "source_quote": "NIOSH REL C 1 ppm (10 mg/m3)", "sources": ["https://www.cdc.gov/niosh/npg/npgd0061.html"], "stale_after": "2027-09-08", "substance": "Boron tribromide", "title": "Boron tribromide \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Boron tribromide\n\n**CAS No.:** 10294334\n\n**PEL (ppm):** 1\n\n**PEL (mg/m\u00b3):** 10\n\n**Ceiling:** C\n\n> 10294334 | | Boron tribromide | 1 | 10 | C\n\nSource: \n", "cas_number": "10294334", "ceiling": "C", "file": "boron-tribromide.md", "generated": true, "harvested": "2026-08-05", "id": "boron-tribromide", "pel_mgm3": "10", "pel_ppm": "1", "source_quote": "10294334 | | Boron tribromide | 1 | 10 | C", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Boron tribromide", "title": "Boron tribromide \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Boron trifluoride\n\n**CAS No.:** 7637072\n\n**PEL (ppm):** 1\n\n**PEL (mg/m\u00b3):** 3\n\n**Ceiling:** C\n\n> 7637072 | | Boron trifluoride | 1 | 3 | C\n\nSource: \n", "cas_number": "7637072", "ceiling": "C", "file": "boron-trifluoride-2.md", "generated": true, "harvested": "2026-08-05", "id": "boron-trifluoride-2", "pel_mgm3": "3", "pel_ppm": "1", "source_quote": "7637072 | | Boron trifluoride | 1 | 3 | C", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Boron trifluoride", "title": "Boron trifluoride \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Boron trifluoride\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Boron trifluoride\n\n**CAS No.:** 7637-07-2\n\n> CAS No. 7637-07-2\n\n**NIOSH REL (ppm):** C 1\n\n**NIOSH REL (mg/m\u00b3):** 3\n\n> NIOSH REL C 1 ppm (3 mg/m3)\n\nSource: \n", "cas_number": "7637-07-2", "file": "boron-trifluoride-3.md", "generated": true, "harvested": "2026-09-08", "id": "boron-trifluoride-3", "quote_cas_number": "CAS No. 7637-07-2", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Boron trifluoride", "rel_mgm3": "3", "rel_ppm": "C 1", "source_quote": "NIOSH REL C 1 ppm (3 mg/m3)", "sources": ["https://www.cdc.gov/niosh/npg/npgd0062.html"], "stale_after": "2027-09-08", "substance": "Boron trifluoride", "title": "Boron trifluoride \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Boron trifluoride\n\n**CAS No.:** 7637-07-2\n\n**PEL (ppm):** (C)1\n\n**PEL (mg/m\u00b3):** (C)3\n\n> Boron trifluoride | 7637-07-2 | (C)1 | (C)3 | - |\n\nSource: \n", "cas_number": "7637-07-2", "file": "boron-trifluoride.md", "generated": true, "harvested": "2026-08-05", "id": "boron-trifluoride", "pel_mgm3": "(C)3", "pel_ppm": "(C)1", "source_quote": "Boron trifluoride | 7637-07-2 | (C)1 | (C)3 | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Boron trifluoride", "title": "Boron trifluoride \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Bromacil\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Bromacil\n\n**CAS No.:** 314-40-9\n\n> CAS No. 314-40-9\n\n**NIOSH REL (ppm):** TWA 1\n\n**NIOSH REL (mg/m\u00b3):** 10\n\n> NIOSH REL TWA 1 ppm (10 mg/m3)\n\nSource: \n", "cas_number": "314-40-9", "file": "bromacil-2.md", "generated": true, "harvested": "2026-09-08", "id": "bromacil-2", "quote_cas_number": "CAS No. 314-40-9", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Bromacil", "rel_mgm3": "10", "rel_ppm": "TWA 1", "source_quote": "NIOSH REL TWA 1 ppm (10 mg/m3)", "sources": ["https://www.cdc.gov/niosh/npg/npgd0063.html"], "stale_after": "2027-09-08", "substance": "Bromacil", "title": "Bromacil \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Bromacil\n\n**CAS No.:** 314409\n\n**PEL (ppm):** 1\n\n**PEL (mg/m\u00b3):** 10\n\n> 314409 | | Bromacil | 1 | 10\n\nSource: \n", "cas_number": "314409", "file": "bromacil.md", "generated": true, "harvested": "2026-08-05", "id": "bromacil", "pel_mgm3": "10", "pel_ppm": "1", "source_quote": "314409 | | Bromacil | 1 | 10", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Bromacil", "title": "Bromacil \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Bromine\n\n**CAS No.:** 7726956\n\n**PEL (ppm):** 0.1\n\n**PEL (mg/m\u00b3):** 0.7\n\n**Ceiling:** C\n\n> 7726956 | | Bromine | 0.1 | 0.7 | C\n\nSource: \n", "cas_number": "7726956", "ceiling": "C", "file": "bromine-2.md", "generated": true, "harvested": "2026-08-05", "id": "bromine-2", "pel_mgm3": "0.7", "pel_ppm": "0.1", "source_quote": "7726956 | | Bromine | 0.1 | 0.7 | C", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Bromine", "title": "Bromine \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Bromine\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Bromine\n\n**CAS No.:** 7726-95-6\n\n> CAS No. 7726-95-6\n\n**NIOSH REL (ppm):** TWA 0.1\n\n**NIOSH REL (mg/m\u00b3):** 0.7\n\n> NIOSH REL TWA 0.1 ppm (0.7 mg/m3) ST 0.3 ppm (2 mg/m3)\n\nSource: \n", "cas_number": "7726-95-6", "file": "bromine-3.md", "generated": true, "harvested": "2026-09-08", "id": "bromine-3", "quote_cas_number": "CAS No. 7726-95-6", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Bromine", "rel_mgm3": "0.7", "rel_ppm": "TWA 0.1", "source_quote": "NIOSH REL TWA 0.1 ppm (0.7 mg/m3) ST 0.3 ppm (2 mg/m3)", "sources": ["https://www.cdc.gov/niosh/npg/npgd0064.html"], "stale_after": "2027-09-08", "substance": "Bromine", "title": "Bromine \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Bromine pentafluoride\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Bromine pentafluoride\n\n**CAS No.:** 7789-30-2\n\n> CAS No. 7789-30-2\n\n**NIOSH REL (ppm):** TWA 0.1\n\n**NIOSH REL (mg/m\u00b3):** 0.7\n\n> NIOSH REL TWA 0.1 ppm (0.7 mg/m\u00b3)\n\nSource: \n", "cas_number": "7789-30-2", "file": "bromine-pentafluoride-2.md", "generated": true, "harvested": "2026-09-08", "id": "bromine-pentafluoride-2", "quote_cas_number": "CAS No. 7789-30-2", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Bromine pentafluoride", "rel_mgm3": "0.7", "rel_ppm": "TWA 0.1", "source_quote": "NIOSH REL TWA 0.1 ppm (0.7 mg/m\u00b3)", "sources": ["https://www.cdc.gov/niosh/npg/npgd0065.html"], "stale_after": "2027-09-08", "substance": "Bromine pentafluoride", "title": "Bromine pentafluoride \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Bromine pentafluoride\n\n**CAS No.:** 7789302\n\n**PEL (ppm):** 0.1\n\n**PEL (mg/m\u00b3):** 0.7\n\n> 7789302 | | Bromine pentafluoride | 0.1 | 0.7\n\nSource: \n", "cas_number": "7789302", "file": "bromine-pentafluoride.md", "generated": true, "harvested": "2026-08-05", "id": "bromine-pentafluoride", "pel_mgm3": "0.7", "pel_ppm": "0.1", "source_quote": "7789302 | | Bromine pentafluoride | 0.1 | 0.7", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Bromine pentafluoride", "title": "Bromine pentafluoride \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Bromine\n\n**CAS No.:** 7726-95-6\n\n**PEL (ppm):** 0.1\n\n**PEL (mg/m\u00b3):** 0.7\n\n> Bromine | 7726-95-6 | 0.1 | 0.7 | - |\n\nSource: \n", "cas_number": "7726-95-6", "file": "bromine.md", "generated": true, "harvested": "2026-08-05", "id": "bromine", "pel_mgm3": "0.7", "pel_ppm": "0.1", "source_quote": "Bromine | 7726-95-6 | 0.1 | 0.7 | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Bromine", "title": "Bromine \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Bromochloromethane; see Chlorobromethane\n\n**CAS No.:** 74975\n\n> 74975 | | Bromochloromethane; see Chlorobromethane\n\nSource: \n", "cas_number": "74975", "file": "bromochloromethane-see-chlorobromethane.md", "generated": true, "harvested": "2026-08-05", "id": "bromochloromethane-see-chlorobromethane", "source_quote": "74975 | | Bromochloromethane; see Chlorobromethane", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Bromochloromethane; see Chlorobromethane", "title": "Bromochloromethane; see Chlorobromethane \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Bromoethane; see Ethyl bromide\n\n**CAS No.:** 74964\n\n> 74964 | | Bromoethane; see Ethyl bromide\n\nSource: \n", "cas_number": "74964", "file": "bromoethane-see-ethyl-bromide.md", "generated": true, "harvested": "2026-08-05", "id": "bromoethane-see-ethyl-bromide", "source_quote": "74964 | | Bromoethane; see Ethyl bromide", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Bromoethane; see Ethyl bromide", "title": "Bromoethane; see Ethyl bromide \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Bromoform\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Bromoform\n\n**CAS No.:** 75-25-2\n\n> CAS No. 75-25-2\n\n**NIOSH REL (ppm):** TWA 0.5\n\n**NIOSH REL (mg/m\u00b3):** 5\n\n> NIOSH REL TWA 0.5 ppm (5 mg/m3) [skin]\n\nSource: \n", "cas_number": "75-25-2", "file": "bromoform-2.md", "generated": true, "harvested": "2026-09-08", "id": "bromoform-2", "quote_cas_number": "CAS No. 75-25-2", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Bromoform", "rel_mgm3": "5", "rel_ppm": "TWA 0.5", "source_quote": "NIOSH REL TWA 0.5 ppm (5 mg/m3) [skin]", "sources": ["https://www.cdc.gov/niosh/npg/npgd0066.html"], "stale_after": "2027-09-08", "substance": "Bromoform", "title": "Bromoform \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Bromoform; tribromomethane\n\n**CAS No.:** 75252\n\n**PEL (ppm):** 0.5\n\n**PEL (mg/m\u00b3):** 5\n\n> 75252 | S | Bromoform; tribromomethane | 0.5 | 5\n\nSource: \n", "cas_number": "75252", "file": "bromoform-tribromomethane.md", "generated": true, "harvested": "2026-08-05", "id": "bromoform-tribromomethane", "pel_mgm3": "5", "pel_ppm": "0.5", "source_quote": "75252 | S | Bromoform; tribromomethane | 0.5 | 5", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Bromoform; tribromomethane", "title": "Bromoform; tribromomethane \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Bromoform\n\n**CAS No.:** 75-25-2\n\n**PEL (ppm):** 0.5\n\n**PEL (mg/m\u00b3):** 5\n\n> Bromoform | 75-25-2 | 0.5 | 5 | X |\n\nSource: \n", "cas_number": "75-25-2", "file": "bromoform.md", "generated": true, "harvested": "2026-08-05", "id": "bromoform", "pel_mgm3": "5", "pel_ppm": "0.5", "source_quote": "Bromoform | 75-25-2 | 0.5 | 5 | X |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Bromoform", "title": "Bromoform \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Bromomethane, see Methyl bromide\n\n**CAS No.:** 74839\n\n> 74839 | | Bromomethane, see Methyl bromide\n\nSource: \n", "cas_number": "74839", "file": "bromomethane-see-methyl-bromide.md", "generated": true, "harvested": "2026-08-05", "id": "bromomethane-see-methyl-bromide", "source_quote": "74839 | | Bromomethane, see Methyl bromide", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Bromomethane, see Methyl bromide", "title": "Bromomethane, see Methyl bromide \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Bromotrifluoromethane; see Trifluorobromomethane\n\n**CAS No.:** 75638\n\n> 75638 | | Bromotrifluoromethane; see Trifluorobromomethane\n\nSource: \n", "cas_number": "75638", "file": "bromotrifluoromethane-see-trifluorobromomethane.md", "generated": true, "harvested": "2026-08-05", "id": "bromotrifluoromethane-see-trifluorobromomethane", "source_quote": "75638 | | Bromotrifluoromethane; see Trifluorobromomethane", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Bromotrifluoromethane; see Trifluorobromomethane", "title": "Bromotrifluoromethane; see Trifluorobromomethane \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Butadiene (1,3-Butadiene); See 29 CFR 1910.1051; 29 CFR 1910.19(l)\n\n**CAS No.:** 106-99-0\n\n**PEL (ppm):** 1 ppm/5 ppm STEL\n\n> Butadiene (1,3-Butadiene); See 29 CFR 1910.1051; 29 CFR 1910.19(l) | 106-99-0 | 1 ppm/5 ppm STEL | - | - |\n\nSource: \n", "cas_number": "106-99-0", "file": "butadiene-1-3-butadiene-see-29-cfr-1910-1051-29-cfr-1910-19-l.md", "generated": true, "harvested": "2026-08-05", "id": "butadiene-1-3-butadiene-see-29-cfr-1910-1051-29-cfr-1910-19-l", "pel_ppm": "1 ppm/5 ppm STEL", "source_quote": "Butadiene (1,3-Butadiene); See 29 CFR 1910.1051; 29 CFR 1910.19(l) | 106-99-0 | 1 ppm/5 ppm STEL | - | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Butadiene (1,3-Butadiene); See 29 CFR 1910.1051; 29 CFR 1910.19(l)", "title": "Butadiene (1,3-Butadiene); See 29 CFR 1910.1051; 29 CFR 1910.19(l) \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Butane\n\n**CAS No.:** 106978\n\n**PEL (ppm):** 800\n\n**PEL (mg/m\u00b3):** 1,900\n\n> 106978 | | Butane | 800 | 1,900\n\nSource: \n", "cas_number": "106978", "file": "butane.md", "generated": true, "harvested": "2026-08-05", "id": "butane", "pel_mgm3": "1,900", "pel_ppm": "800", "source_quote": "106978 | | Butane | 800 | 1,900", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Butane", "title": "Butane \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Butyl acrylate\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Butyl acrylate\n\n**CAS No.:** 141-32-2\n\n> CAS No. 141-32-2\n\n**NIOSH REL (ppm):** TWA 10\n\n**NIOSH REL (mg/m\u00b3):** 55\n\n> NIOSH REL TWA 10 ppm (55 mg/m\u00b3)\n\nSource: \n", "cas_number": "141-32-2", "file": "butyl-acrylate-2.md", "generated": true, "harvested": "2026-09-08", "id": "butyl-acrylate-2", "quote_cas_number": "CAS No. 141-32-2", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Butyl acrylate", "rel_mgm3": "55", "rel_ppm": "TWA 10", "source_quote": "NIOSH REL TWA 10 ppm (55 mg/m\u00b3)", "sources": ["https://www.cdc.gov/niosh/npg/npgd0075.html"], "stale_after": "2027-09-08", "substance": "Butyl acrylate", "title": "Butyl acrylate \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Butyl acrylate\n\n**CAS No.:** 141322\n\n**PEL (ppm):** 2\n\n**PEL (mg/m\u00b3):** 11\n\n> 141322 | | Butyl acrylate | 2 | 11\n\nSource: \n", "cas_number": "141322", "file": "butyl-acrylate.md", "generated": true, "harvested": "2026-08-05", "id": "butyl-acrylate", "pel_mgm3": "11", "pel_ppm": "2", "source_quote": "141322 | | Butyl acrylate | 2 | 11", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Butyl acrylate", "title": "Butyl acrylate \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Butyl mercaptan\n\n**CAS No.:** 109-79-5\n\n**PEL (ppm):** 10\n\n**PEL (mg/m\u00b3):** 35\n\n> Butyl mercaptan | 109-79-5 | 10 | 35 | - |\n\nSource: \n", "cas_number": "109-79-5", "file": "butyl-mercaptan.md", "generated": true, "harvested": "2026-08-05", "id": "butyl-mercaptan", "pel_mgm3": "35", "pel_ppm": "10", "source_quote": "Butyl mercaptan | 109-79-5 | 10 | 35 | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Butyl mercaptan", "title": "Butyl mercaptan \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Butylamine\n\n**CAS No.:** 109739\n\n**PEL (ppm):** 5\n\n**PEL (mg/m\u00b3):** 15\n\n**Ceiling:** C\n\n> 109739 | S | Butylamine | 5 | 15 | C\n\nSource: \n", "cas_number": "109739", "ceiling": "C", "file": "butylamine-2.md", "generated": true, "harvested": "2026-08-05", "id": "butylamine-2", "pel_mgm3": "15", "pel_ppm": "5", "source_quote": "109739 | S | Butylamine | 5 | 15 | C", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Butylamine", "title": "Butylamine \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Butylamine\n\n**CAS No.:** 109-73-9\n\n**PEL (ppm):** (C)5\n\n**PEL (mg/m\u00b3):** (C)15\n\n> Butylamine | 109-73-9 | (C)5 | (C)15 | X |\n\nSource: \n", "cas_number": "109-73-9", "file": "butylamine.md", "generated": true, "harvested": "2026-08-05", "id": "butylamine", "pel_mgm3": "(C)15", "pel_ppm": "(C)5", "source_quote": "Butylamine | 109-73-9 | (C)5 | (C)15 | X |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Butylamine", "title": "Butylamine \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Cadmium (as Cd); see 1910.1027\n\n**CAS No.:** 7440-43-9\n\n> Cadmium (as Cd); see 1910.1027 | 7440-43-9 | - | - | - |\n\nSource: \n", "cas_number": "7440-43-9", "file": "cadmium-as-cd-see-1910-1027.md", "generated": true, "harvested": "2026-08-05", "id": "cadmium-as-cd-see-1910-1027", "source_quote": "Cadmium (as Cd); see 1910.1027 | 7440-43-9 | - | - | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Cadmium (as Cd); see 1910.1027", "title": "Cadmium (as Cd); see 1910.1027 \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Cadmium dust (as Cd)\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Cadmium dust (as Cd)\n\n**CAS No.:** 7440-43-9 (metal)\n\n> CAS No. 7440-43-9 (metal)\n\n**NIOSH REL, as stated:** Ca See Appendix A\n\n> NIOSH REL Ca See Appendix A\n\nSource: \n", "cas_number": "7440-43-9 (metal)", "file": "cadmium-dust-as-cd.md", "generated": true, "harvested": "2026-09-08", "id": "cadmium-dust-as-cd", "quote_cas_number": "CAS No. 7440-43-9 (metal)", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Cadmium dust (as Cd)", "rel_statement": "Ca See Appendix A", "source_quote": "NIOSH REL Ca See Appendix A", "sources": ["https://www.cdc.gov/niosh/npg/npgd0087.html"], "stale_after": "2027-09-08", "substance": "Cadmium dust (as Cd)", "title": "Cadmium dust (as Cd) \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Cadmium fume (as Cd)\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Cadmium fume (as Cd)\n\n**CAS No.:** 1306-19-0 (CdO)\n\n> CAS No. 1306-19-0 (CdO)\n\n**NIOSH REL, as stated:** Ca See Appendix A\n\n> NIOSH REL Ca See Appendix A\n\nSource: \n", "cas_number": "1306-19-0 (CdO)", "file": "cadmium-fume-as-cd.md", "generated": true, "harvested": "2026-09-08", "id": "cadmium-fume-as-cd", "quote_cas_number": "CAS No. 1306-19-0 (CdO)", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Cadmium fume (as Cd)", "rel_statement": "Ca See Appendix A", "source_quote": "NIOSH REL Ca See Appendix A", "sources": ["https://www.cdc.gov/niosh/npg/npgd0088.html"], "stale_after": "2027-09-08", "substance": "Cadmium fume (as Cd)", "title": "Cadmium fume (as Cd) \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Cadmium metal dust, as Cd\n\n**CAS No.:** 7440439\n\n> 7440439 | | Cadmium metal dust, as Cd\n\nSource: \n", "cas_number": "7440439", "file": "cadmium-metal-dust-as-cd.md", "generated": true, "harvested": "2026-08-05", "id": "cadmium-metal-dust-as-cd", "source_quote": "7440439 | | Cadmium metal dust, as Cd", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Cadmium metal dust, as Cd", "title": "Cadmium metal dust, as Cd \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Cadmium oxide fume, as Cd\n\n**CAS No.:** 1306190\n\n> 1306190 | | Cadmium oxide fume, as Cd\n\nSource: \n", "cas_number": "1306190", "file": "cadmium-oxide-fume-as-cd.md", "generated": true, "harvested": "2026-08-05", "id": "cadmium-oxide-fume-as-cd", "source_quote": "1306190 | | Cadmium oxide fume, as Cd", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Cadmium oxide fume, as Cd", "title": "Cadmium oxide fume, as Cd \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Calcium arsenate (as As)\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Calcium arsenate (as As)\n\n**CAS No.:** 7778-44-1\n\n> CAS No. 7778-44-1\n\n**NIOSH REL (mg/m\u00b3):** C 0.002\n\n> NIOSH REL Ca C 0.002 mg/m3 [15-minute]\n\nSource: \n", "cas_number": "7778-44-1", "file": "calcium-arsenate-as-as.md", "generated": true, "harvested": "2026-09-08", "id": "calcium-arsenate-as-as", "quote_cas_number": "CAS No. 7778-44-1", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Calcium arsenate (as As)", "rel_mgm3": "C 0.002", "source_quote": "NIOSH REL Ca C 0.002 mg/m3 [15-minute]", "sources": ["https://www.cdc.gov/niosh/npg/npgd0089.html"], "stale_after": "2027-09-08", "substance": "Calcium arsenate (as As)", "title": "Calcium arsenate (as As) \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Calcium arsenate; see Arsenic, inorganic (see also Section 5214)\n\n**CAS No.:** 7778441\n\n> 7778441 | | Calcium arsenate; see Arsenic, inorganic (see also Section 5214)\n\nSource: \n", "cas_number": "7778441", "file": "calcium-arsenate-see-arsenic-inorganic-see-also-section-5214.md", "generated": true, "harvested": "2026-08-05", "id": "calcium-arsenate-see-arsenic-inorganic-see-also-section-5214", "source_quote": "7778441 | | Calcium arsenate; see Arsenic, inorganic (see also Section 5214)", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Calcium arsenate; see Arsenic, inorganic (see also Section 5214)", "title": "Calcium arsenate; see Arsenic, inorganic (see also Section 5214) \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Calcium carbonate\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Calcium carbonate\n\n**CAS No.:** 471-34-1 (synthetic) 1317-65-3 (natural)\n\n> CAS No. 471-34-1 (synthetic) 1317-65-3 (natural)\n\n**NIOSH REL, as stated:** TWA 10 mg/m3 (total) TWA 5 mg/m3 (resp)\n\n> NIOSH REL TWA 10 mg/m3 (total) TWA 5 mg/m3 (resp)\n\nSource: \n", "cas_number": "471-34-1 (synthetic) 1317-65-3 (natural)", "file": "calcium-carbonate-2.md", "generated": true, "harvested": "2026-09-08", "id": "calcium-carbonate-2", "quote_cas_number": "CAS No. 471-34-1 (synthetic) 1317-65-3 (natural)", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Calcium carbonate", "rel_statement": "TWA 10 mg/m3 (total) TWA 5 mg/m3 (resp)", "source_quote": "NIOSH REL TWA 10 mg/m3 (total) TWA 5 mg/m3 (resp)", "sources": ["https://www.cdc.gov/niosh/npg/npgd0090.html"], "stale_after": "2027-09-08", "substance": "Calcium carbonate", "title": "Calcium carbonate \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Calcium carbonate; see Particulates not otherwise regulated\n\n**CAS No.:** 471341\n\n> 471341 | | Calcium carbonate; see Particulates not otherwise regulated | --\n\nSource: \n", "cas_number": "471341", "file": "calcium-carbonate-see-particulates-not-otherwise-regulated.md", "generated": true, "harvested": "2026-08-05", "id": "calcium-carbonate-see-particulates-not-otherwise-regulated", "source_quote": "471341 | | Calcium carbonate; see Particulates not otherwise regulated | --", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Calcium carbonate; see Particulates not otherwise regulated", "title": "Calcium carbonate; see Particulates not otherwise regulated \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Calcium carbonate\n\n**CAS No.:** 1317-65-3\n\n> Calcium carbonate | 1317-65-3 | - | - | - |\n\nSource: \n", "cas_number": "1317-65-3", "file": "calcium-carbonate.md", "generated": true, "harvested": "2026-08-05", "id": "calcium-carbonate", "source_quote": "Calcium carbonate | 1317-65-3 | - | - | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Calcium carbonate", "title": "Calcium carbonate \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Calcium cyanamide\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Calcium cyanamide\n\n**CAS No.:** 156-62-7\n\n> CAS No. 156-62-7\n\n**NIOSH REL (mg/m\u00b3):** TWA 0.5\n\n> NIOSH REL TWA 0.5 mg/m3\n\nSource: \n", "cas_number": "156-62-7", "file": "calcium-cyanamide-2.md", "generated": true, "harvested": "2026-09-08", "id": "calcium-cyanamide-2", "quote_cas_number": "CAS No. 156-62-7", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Calcium cyanamide", "rel_mgm3": "TWA 0.5", "source_quote": "NIOSH REL TWA 0.5 mg/m3", "sources": ["https://www.cdc.gov/niosh/npg/npgd0091.html"], "stale_after": "2027-09-08", "substance": "Calcium cyanamide", "title": "Calcium cyanamide \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Calcium cyanamide\n\n**CAS No.:** 156627\n\n**PEL (mg/m\u00b3):** 0.5\n\n> 156627 | | Calcium cyanamide | -- | 0.5\n\nSource: \n", "cas_number": "156627", "file": "calcium-cyanamide.md", "generated": true, "harvested": "2026-08-05", "id": "calcium-cyanamide", "pel_mgm3": "0.5", "source_quote": "156627 | | Calcium cyanamide | -- | 0.5", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Calcium cyanamide", "title": "Calcium cyanamide \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Calcium hydroxide\n\n**CAS No.:** 1305620\n\n**PEL (mg/m\u00b3):** 5\n\n> 1305620 | | Calcium hydroxide | -- | 5\n\nSource: \n", "cas_number": "1305620", "file": "calcium-hydroxide-2.md", "generated": true, "harvested": "2026-08-05", "id": "calcium-hydroxide-2", "pel_mgm3": "5", "source_quote": "1305620 | | Calcium hydroxide | -- | 5", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Calcium hydroxide", "title": "Calcium hydroxide \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Calcium hydroxide\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Calcium hydroxide\n\n**CAS No.:** 1305-62-0\n\n> CAS No. 1305-62-0\n\n**NIOSH REL (mg/m\u00b3):** TWA 5\n\n> NIOSH REL TWA 5 mg/m3\n\nSource: \n", "cas_number": "1305-62-0", "file": "calcium-hydroxide-3.md", "generated": true, "harvested": "2026-09-08", "id": "calcium-hydroxide-3", "quote_cas_number": "CAS No. 1305-62-0", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Calcium hydroxide", "rel_mgm3": "TWA 5", "source_quote": "NIOSH REL TWA 5 mg/m3", "sources": ["https://www.cdc.gov/niosh/npg/npgd0092.html"], "stale_after": "2027-09-08", "substance": "Calcium hydroxide", "title": "Calcium hydroxide \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Calcium hydroxide\n\n**CAS No.:** 1305-62-0\n\n> Calcium hydroxide | 1305-62-0 | - | - | - |\n\nSource: \n", "cas_number": "1305-62-0", "file": "calcium-hydroxide.md", "generated": true, "harvested": "2026-08-05", "id": "calcium-hydroxide", "source_quote": "Calcium hydroxide | 1305-62-0 | - | - | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Calcium hydroxide", "title": "Calcium hydroxide \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Calcium oxide\n\n**CAS No.:** 1305788\n\n**PEL (mg/m\u00b3):** 2\n\n> 1305788 | | Calcium oxide | -- | 2\n\nSource: \n", "cas_number": "1305788", "file": "calcium-oxide-2.md", "generated": true, "harvested": "2026-08-05", "id": "calcium-oxide-2", "pel_mgm3": "2", "source_quote": "1305788 | | Calcium oxide | -- | 2", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Calcium oxide", "title": "Calcium oxide \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Calcium oxide\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Calcium oxide\n\n**CAS No.:** 1305-78-8\n\n> CAS No. 1305-78-8\n\n**NIOSH REL (mg/m\u00b3):** TWA 2\n\n> NIOSH REL TWA 2 mg/m3\n\nSource: \n", "cas_number": "1305-78-8", "file": "calcium-oxide-3.md", "generated": true, "harvested": "2026-09-08", "id": "calcium-oxide-3", "quote_cas_number": "CAS No. 1305-78-8", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Calcium oxide", "rel_mgm3": "TWA 2", "source_quote": "NIOSH REL TWA 2 mg/m3", "sources": ["https://www.cdc.gov/niosh/npg/npgd0093.html"], "stale_after": "2027-09-08", "substance": "Calcium oxide", "title": "Calcium oxide \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Calcium oxide\n\n**CAS No.:** 1305-78-8\n\n**PEL (mg/m\u00b3):** 5\n\n> Calcium oxide | 1305-78-8 | - | 5 | - |\n\nSource: \n", "cas_number": "1305-78-8", "file": "calcium-oxide.md", "generated": true, "harvested": "2026-08-05", "id": "calcium-oxide", "pel_mgm3": "5", "source_quote": "Calcium oxide | 1305-78-8 | - | 5 | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Calcium oxide", "title": "Calcium oxide \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Calcium silicate\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Calcium silicate\n\n**CAS No.:** 1344-95-2\n\n> CAS No. 1344-95-2\n\n**NIOSH REL, as stated:** TWA 10 mg/m3 (total) TWA 5 mg/m3 (resp)\n\n> NIOSH REL TWA 10 mg/m3 (total) TWA 5 mg/m3 (resp)\n\nSource: \n", "cas_number": "1344-95-2", "file": "calcium-silicate-2.md", "generated": true, "harvested": "2026-09-08", "id": "calcium-silicate-2", "quote_cas_number": "CAS No. 1344-95-2", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Calcium silicate", "rel_statement": "TWA 10 mg/m3 (total) TWA 5 mg/m3 (resp)", "source_quote": "NIOSH REL TWA 10 mg/m3 (total) TWA 5 mg/m3 (resp)", "sources": ["https://www.cdc.gov/niosh/npg/npgd0094.html"], "stale_after": "2027-09-08", "substance": "Calcium silicate", "title": "Calcium silicate \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Calcium silicate (synthetic): see Particulates not otherwise regulated\n\n**CAS No.:** 1344952\n\n> 1344952 | | Calcium silicate (synthetic): see Particulates not otherwise regulated\n\nSource: \n", "cas_number": "1344952", "file": "calcium-silicate-synthetic-see-particulates-not-otherwise-regulated.md", "generated": true, "harvested": "2026-08-05", "id": "calcium-silicate-synthetic-see-particulates-not-otherwise-regulated", "source_quote": "1344952 | | Calcium silicate (synthetic): see Particulates not otherwise regulated", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Calcium silicate (synthetic): see Particulates not otherwise regulated", "title": "Calcium silicate (synthetic): see Particulates not otherwise regulated \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Calcium silicate\n\n**CAS No.:** 1344-95-2\n\n> Calcium silicate | 1344-95-2 | - | - | - |\n\nSource: \n", "cas_number": "1344-95-2", "file": "calcium-silicate.md", "generated": true, "harvested": "2026-08-05", "id": "calcium-silicate", "source_quote": "Calcium silicate | 1344-95-2 | - | - | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Calcium silicate", "title": "Calcium silicate \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Calcium stearate\n\n**CAS No.:** 1592230\n\n**PEL (mg/m\u00b3):** 10\n\n> 1592230 | | Calcium stearate | -- | 10\n\nSource: \n", "cas_number": "1592230", "file": "calcium-stearate.md", "generated": true, "harvested": "2026-08-05", "id": "calcium-stearate", "pel_mgm3": "10", "source_quote": "1592230 | | Calcium stearate | -- | 10", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Calcium stearate", "title": "Calcium stearate \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Calcium sulfate\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Calcium sulfate\n\n**CAS No.:** 7778-18-9\n\n> CAS No. 7778-18-9\n\n**NIOSH REL, as stated:** TWA 10 mg/m3 (total) TWA 5 mg/m3 (resp)\n\n> NIOSH REL TWA 10 mg/m3 (total) TWA 5 mg/m3 (resp)\n\nSource: \n", "cas_number": "7778-18-9", "file": "calcium-sulfate-2.md", "generated": true, "harvested": "2026-09-08", "id": "calcium-sulfate-2", "quote_cas_number": "CAS No. 7778-18-9", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Calcium sulfate", "rel_statement": "TWA 10 mg/m3 (total) TWA 5 mg/m3 (resp)", "source_quote": "NIOSH REL TWA 10 mg/m3 (total) TWA 5 mg/m3 (resp)", "sources": ["https://www.cdc.gov/niosh/npg/npgd0095.html"], "stale_after": "2027-09-08", "substance": "Calcium sulfate", "title": "Calcium sulfate \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Calcium sulfate; see Particulates not otherwise regulated\n\n**CAS No.:** 7778189\n\n> 7778189 | | Calcium sulfate; see Particulates not otherwise regulated\n\nSource: \n", "cas_number": "7778189", "file": "calcium-sulfate-see-particulates-not-otherwise-regulated.md", "generated": true, "harvested": "2026-08-05", "id": "calcium-sulfate-see-particulates-not-otherwise-regulated", "source_quote": "7778189 | | Calcium sulfate; see Particulates not otherwise regulated", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Calcium sulfate; see Particulates not otherwise regulated", "title": "Calcium sulfate; see Particulates not otherwise regulated \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Calcium sulfate\n\n**CAS No.:** 7778-18-9\n\n> Calcium sulfate | 7778-18-9 | - | - | - |\n\nSource: \n", "cas_number": "7778-18-9", "file": "calcium-sulfate.md", "generated": true, "harvested": "2026-08-05", "id": "calcium-sulfate", "source_quote": "Calcium sulfate | 7778-18-9 | - | - | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Calcium sulfate", "title": "Calcium sulfate \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Camphor (synthetic)\n\n**CAS No.:** 76222\n\n**PEL (mg/m\u00b3):** 2\n\n> 76222 | | Camphor (synthetic) | -- | 2\n\nSource: \n", "cas_number": "76222", "file": "camphor-synthetic-2.md", "generated": true, "harvested": "2026-08-05", "id": "camphor-synthetic-2", "pel_mgm3": "2", "source_quote": "76222 | | Camphor (synthetic) | -- | 2", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Camphor (synthetic)", "title": "Camphor (synthetic) \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Camphor (synthetic)\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Camphor (synthetic)\n\n**CAS No.:** 76-22-2\n\n> CAS No. 76-22-2\n\n**NIOSH REL (mg/m\u00b3):** TWA 2\n\n> NIOSH REL TWA 2 mg/m3\n\nSource: \n", "cas_number": "76-22-2", "file": "camphor-synthetic-3.md", "generated": true, "harvested": "2026-09-08", "id": "camphor-synthetic-3", "quote_cas_number": "CAS No. 76-22-2", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Camphor (synthetic)", "rel_mgm3": "TWA 2", "source_quote": "NIOSH REL TWA 2 mg/m3", "sources": ["https://www.cdc.gov/niosh/npg/npgd0096.html"], "stale_after": "2027-09-08", "substance": "Camphor (synthetic)", "title": "Camphor (synthetic) \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Camphor, synthetic\n\n**CAS No.:** 76-22-2\n\n**PEL (mg/m\u00b3):** 2\n\n> Camphor, synthetic | 76-22-2 | - | 2 | - |\n\nSource: \n", "cas_number": "76-22-2", "file": "camphor-synthetic.md", "generated": true, "harvested": "2026-08-05", "id": "camphor-synthetic", "pel_mgm3": "2", "source_quote": "Camphor, synthetic | 76-22-2 | - | 2 | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Camphor, synthetic", "title": "Camphor, synthetic \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Caprolactam dust\n\n**CAS No.:** 105602\n\n**PEL (mg/m\u00b3):** 1\n\n**STEL (mg/m\u00b3):** 3\n\n> 105602 | | Caprolactam dust | -- | 1 | | -- | 3\n\nSource: \n", "cas_number": "105602", "file": "caprolactam-dust.md", "generated": true, "harvested": "2026-08-05", "id": "caprolactam-dust", "pel_mgm3": "1", "source_quote": "105602 | | Caprolactam dust | -- | 1 | | -- | 3", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "stel_mgm3": "3", "substance": "Caprolactam dust", "title": "Caprolactam dust \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Caprolactam vapor\n\n**CAS No.:** 105602\n\n**PEL (ppm):** 5\n\n**PEL (mg/m\u00b3):** 20\n\n**STEL (ppm):** 10\n\n**STEL (mg/m\u00b3):** 40\n\n> 105602 | | Caprolactam vapor | 5 | 20 | | 10 | 40\n\nSource: \n", "cas_number": "105602", "file": "caprolactam-vapor.md", "generated": true, "harvested": "2026-08-05", "id": "caprolactam-vapor", "pel_mgm3": "20", "pel_ppm": "5", "source_quote": "105602 | | Caprolactam vapor | 5 | 20 | | 10 | 40", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "stel_mgm3": "40", "stel_ppm": "10", "substance": "Caprolactam vapor", "title": "Caprolactam vapor \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Caprolactam\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Caprolactam\n\n**CAS No.:** 105-60-2\n\n> CAS No. 105-60-2\n\n**NIOSH REL, as stated:** Dust: TWA 1 mg/m3 ST 3 mg/m3 Vapor: TWA 0.22 ppm (1 mg/m3) ST 0.66 ppm (3 mg/m3)\n\n> NIOSH REL Dust: TWA 1 mg/m3 ST 3 mg/m3 Vapor: TWA 0.22 ppm (1 mg/m3) ST 0.66 ppm (3 mg/m3)\n\nSource: \n", "cas_number": "105-60-2", "file": "caprolactam.md", "generated": true, "harvested": "2026-09-08", "id": "caprolactam", "quote_cas_number": "CAS No. 105-60-2", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Caprolactam", "rel_statement": "Dust: TWA 1 mg/m3 ST 3 mg/m3 Vapor: TWA 0.22 ppm (1 mg/m3) ST 0.66 ppm (3 mg/m3)", "source_quote": "NIOSH REL Dust: TWA 1 mg/m3 ST 3 mg/m3 Vapor: TWA 0.22 ppm (1 mg/m3) ST 0.66 ppm (3 mg/m3)", "sources": ["https://www.cdc.gov/niosh/npg/npgd0097.html"], "stale_after": "2027-09-08", "substance": "Caprolactam", "title": "Caprolactam \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Captafol\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Captafol\n\n**CAS No.:** 2425-06-1\n\n> CAS No. 2425-06-1\n\n**NIOSH REL (mg/m\u00b3):** TWA 0.1\n\n> NIOSH REL Ca TWA 0.1 mg/m3 [skin]\n\nSource: \n", "cas_number": "2425-06-1", "file": "captafol-2.md", "generated": true, "harvested": "2026-09-08", "id": "captafol-2", "quote_cas_number": "CAS No. 2425-06-1", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Captafol", "rel_mgm3": "TWA 0.1", "source_quote": "NIOSH REL Ca TWA 0.1 mg/m3 [skin]", "sources": ["https://www.cdc.gov/niosh/npg/npgd0098.html"], "stale_after": "2027-09-08", "substance": "Captafol", "title": "Captafol \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Captafol\n\n**CAS No.:** 2425061\n\n**PEL (mg/m\u00b3):** 0.1\n\n> 2425061 | S | Captafol | -- | 0.1\n\nSource: \n", "cas_number": "2425061", "file": "captafol.md", "generated": true, "harvested": "2026-08-05", "id": "captafol", "pel_mgm3": "0.1", "source_quote": "2425061 | S | Captafol | -- | 0.1", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Captafol", "title": "Captafol \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Captan\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Captan\n\n**CAS No.:** 133-06-2\n\n> CAS No. 133-06-2\n\n**NIOSH REL (mg/m\u00b3):** TWA 5\n\n> NIOSH REL Ca TWA 5 mg/m3\n\nSource: \n", "cas_number": "133-06-2", "file": "captan-2.md", "generated": true, "harvested": "2026-09-08", "id": "captan-2", "quote_cas_number": "CAS No. 133-06-2", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Captan", "rel_mgm3": "TWA 5", "source_quote": "NIOSH REL Ca TWA 5 mg/m3", "sources": ["https://www.cdc.gov/niosh/npg/npgd0099.html"], "stale_after": "2027-09-08", "substance": "Captan", "title": "Captan \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Captan\n\n**CAS No.:** 133062\n\n**PEL (mg/m\u00b3):** 5\n\n> 133062 | | Captan | -- | 5\n\nSource: \n", "cas_number": "133062", "file": "captan.md", "generated": true, "harvested": "2026-08-05", "id": "captan", "pel_mgm3": "5", "source_quote": "133062 | | Captan | -- | 5", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Captan", "title": "Captan \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Carbaryl; 1-naphthyl N-methylcarbamate\n\n**CAS No.:** 63252\n\n**PEL (mg/m\u00b3):** 5\n\n> 63252 | | Carbaryl; 1-naphthyl N-methylcarbamate | -- | 5\n\nSource: \n", "cas_number": "63252", "file": "carbaryl-1-naphthyl-n-methylcarbamate.md", "generated": true, "harvested": "2026-08-05", "id": "carbaryl-1-naphthyl-n-methylcarbamate", "pel_mgm3": "5", "source_quote": "63252 | | Carbaryl; 1-naphthyl N-methylcarbamate | -- | 5", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Carbaryl; 1-naphthyl N-methylcarbamate", "title": "Carbaryl; 1-naphthyl N-methylcarbamate \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Carbaryl (Sevin)\n\n**CAS No.:** 63-25-2\n\n**PEL (mg/m\u00b3):** 5\n\n> Carbaryl (Sevin) | 63-25-2 | - | 5 | - |\n\nSource: \n", "cas_number": "63-25-2", "file": "carbaryl-sevin.md", "generated": true, "harvested": "2026-08-05", "id": "carbaryl-sevin", "pel_mgm3": "5", "source_quote": "Carbaryl (Sevin) | 63-25-2 | - | 5 | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Carbaryl (Sevin)", "title": "Carbaryl (Sevin) \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Carbaryl\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Carbaryl\n\n**CAS No.:** 63-25-2\n\n> CAS No. 63-25-2\n\n**NIOSH REL (mg/m\u00b3):** TWA 5\n\n> NIOSH REL TWA 5 mg/m3\n\nSource: \n", "cas_number": "63-25-2", "file": "carbaryl.md", "generated": true, "harvested": "2026-09-08", "id": "carbaryl", "quote_cas_number": "CAS No. 63-25-2", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Carbaryl", "rel_mgm3": "TWA 5", "source_quote": "NIOSH REL TWA 5 mg/m3", "sources": ["https://www.cdc.gov/niosh/npg/npgd0100.html"], "stale_after": "2027-09-08", "substance": "Carbaryl", "title": "Carbaryl \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Carbofuran\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Carbofuran\n\n**CAS No.:** 1563-66-2\n\n> CAS No. 1563-66-2\n\n**NIOSH REL (mg/m\u00b3):** TWA 0.1\n\n> NIOSH REL TWA 0.1 mg/m3\n\nSource: \n", "cas_number": "1563-66-2", "file": "carbofuran-2.md", "generated": true, "harvested": "2026-09-08", "id": "carbofuran-2", "quote_cas_number": "CAS No. 1563-66-2", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Carbofuran", "rel_mgm3": "TWA 0.1", "source_quote": "NIOSH REL TWA 0.1 mg/m3", "sources": ["https://www.cdc.gov/niosh/npg/npgd0101.html"], "stale_after": "2027-09-08", "substance": "Carbofuran", "title": "Carbofuran \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Carbofuran\n\n**CAS No.:** 1563662\n\n**PEL (mg/m\u00b3):** 0.1\n\n> 1563662 | | Carbofuran | -- | 0.1\n\nSource: \n", "cas_number": "1563662", "file": "carbofuran.md", "generated": true, "harvested": "2026-08-05", "id": "carbofuran", "pel_mgm3": "0.1", "source_quote": "1563662 | | Carbofuran | -- | 0.1", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Carbofuran", "title": "Carbofuran \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Carbon black\n\n**CAS No.:** 1333864\n\n**PEL (mg/m\u00b3):** 3.5\n\n> 1333864 | | Carbon black | -- | 3.5\n\nSource: \n", "cas_number": "1333864", "file": "carbon-black-2.md", "generated": true, "harvested": "2026-08-05", "id": "carbon-black-2", "pel_mgm3": "3.5", "source_quote": "1333864 | | Carbon black | -- | 3.5", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Carbon black", "title": "Carbon black \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Carbon black\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Carbon black\n\n**CAS No.:** 1333-86-4\n\n> CAS No. 1333-86-4\n\n**NIOSH REL (mg/m\u00b3):** TWA 3.5\n\n> NIOSH REL TWA 3.5 mg/m3 Ca TWA 0.1 mg PAHs/m3 [Carbon black in presence of polycyclic aromatic hydrocarbons (PAHs)]\n\nSource: \n", "cas_number": "1333-86-4", "file": "carbon-black-3.md", "generated": true, "harvested": "2026-09-08", "id": "carbon-black-3", "quote_cas_number": "CAS No. 1333-86-4", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Carbon black", "rel_mgm3": "TWA 3.5", "source_quote": "NIOSH REL TWA 3.5 mg/m3 Ca TWA 0.1 mg PAHs/m3 [Carbon black in presence of polycyclic aromatic hydrocarbons (PAHs)]", "sources": ["https://www.cdc.gov/niosh/npg/npgd0102.html"], "stale_after": "2027-09-08", "substance": "Carbon black", "title": "Carbon black \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Carbon black\n\n**CAS No.:** 1333-86-4\n\n**PEL (mg/m\u00b3):** 3.5\n\n> Carbon black | 1333-86-4 | - | 3.5 | - |\n\nSource: \n", "cas_number": "1333-86-4", "file": "carbon-black.md", "generated": true, "harvested": "2026-08-05", "id": "carbon-black", "pel_mgm3": "3.5", "source_quote": "Carbon black | 1333-86-4 | - | 3.5 | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Carbon black", "title": "Carbon black \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Carbon dioxide\n\n**CAS No.:** 124389\n\n**PEL (ppm):** 5,000\n\n**PEL (mg/m\u00b3):** 9,000\n\n**STEL (ppm):** 30,000\n\n**STEL (mg/m\u00b3):** 54,000\n\n> 124389 | | Carbon dioxide | 5,000 | 9,000 | | 30,000 | 54,000\n\nSource: \n", "cas_number": "124389", "file": "carbon-dioxide-2.md", "generated": true, "harvested": "2026-08-05", "id": "carbon-dioxide-2", "pel_mgm3": "9,000", "pel_ppm": "5,000", "source_quote": "124389 | | Carbon dioxide | 5,000 | 9,000 | | 30,000 | 54,000", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "stel_mgm3": "54,000", "stel_ppm": "30,000", "substance": "Carbon dioxide", "title": "Carbon dioxide \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Carbon dioxide\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Carbon dioxide\n\n**CAS No.:** 124-38-9\n\n> CAS No. 124-38-9\n\n**NIOSH REL (ppm):** TWA 5000\n\n**NIOSH REL (mg/m\u00b3):** 9000\n\n> NIOSH REL TWA 5000 ppm (9000 mg/m3) ST 30,000 ppm (54,000 mg/m3)\n\nSource: \n", "cas_number": "124-38-9", "file": "carbon-dioxide-3.md", "generated": true, "harvested": "2026-09-08", "id": "carbon-dioxide-3", "quote_cas_number": "CAS No. 124-38-9", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Carbon dioxide", "rel_mgm3": "9000", "rel_ppm": "TWA 5000", "source_quote": "NIOSH REL TWA 5000 ppm (9000 mg/m3) ST 30,000 ppm (54,000 mg/m3)", "sources": ["https://www.cdc.gov/niosh/npg/npgd0103.html"], "stale_after": "2027-09-08", "substance": "Carbon dioxide", "title": "Carbon dioxide \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Carbon dioxide\n\n**CAS No.:** 124-38-9\n\n**PEL (ppm):** 5000\n\n**PEL (mg/m\u00b3):** 9000\n\n> Carbon dioxide | 124-38-9 | 5000 | 9000 | - |\n\nSource: \n", "cas_number": "124-38-9", "file": "carbon-dioxide.md", "generated": true, "harvested": "2026-08-05", "id": "carbon-dioxide", "pel_mgm3": "9000", "pel_ppm": "5000", "source_quote": "Carbon dioxide | 124-38-9 | 5000 | 9000 | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Carbon dioxide", "title": "Carbon dioxide \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Carbon disulfide\n\n**CAS No.:** 75150\n\n**PEL (ppm):** 1\n\n**PEL (mg/m\u00b3):** 3\n\n**Ceiling:** 30 ppm\n\n**STEL (ppm):** 12\n\n**STEL (mg/m\u00b3):** 36\n\n> 75150 | S | Carbon disulfide | 1 | 3 | 30 ppm | 12 | 36\n\nSource: \n", "cas_number": "75150", "ceiling": "30 ppm", "file": "carbon-disulfide-2.md", "generated": true, "harvested": "2026-08-05", "id": "carbon-disulfide-2", "pel_mgm3": "3", "pel_ppm": "1", "source_quote": "75150 | S | Carbon disulfide | 1 | 3 | 30 ppm | 12 | 36", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "stel_mgm3": "36", "stel_ppm": "12", "substance": "Carbon disulfide", "title": "Carbon disulfide \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Carbon disulfide\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Carbon disulfide\n\n**CAS No.:** 75-15-0\n\n> CAS No. 75-15-0\n\n**NIOSH REL (ppm):** TWA 1\n\n**NIOSH REL (mg/m\u00b3):** 3\n\n> NIOSH REL TWA 1 ppm (3 mg/m3) ST 10 ppm (30 mg/m3) [skin]\n\nSource: \n", "cas_number": "75-15-0", "file": "carbon-disulfide-3.md", "generated": true, "harvested": "2026-09-08", "id": "carbon-disulfide-3", "quote_cas_number": "CAS No. 75-15-0", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Carbon disulfide", "rel_mgm3": "3", "rel_ppm": "TWA 1", "source_quote": "NIOSH REL TWA 1 ppm (3 mg/m3) ST 10 ppm (30 mg/m3) [skin]", "sources": ["https://www.cdc.gov/niosh/npg/npgd0104.html"], "stale_after": "2027-09-08", "substance": "Carbon disulfide", "title": "Carbon disulfide \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Carbon disulfide\n\n**CAS No.:** 75-15-0\n\n> Carbon disulfide | 75-15-0 | - | (2) | - |\n\nSource: \n", "cas_number": "75-15-0", "file": "carbon-disulfide.md", "generated": true, "harvested": "2026-08-05", "id": "carbon-disulfide", "source_quote": "Carbon disulfide | 75-15-0 | - | (2) | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Carbon disulfide", "title": "Carbon disulfide \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Carbon monoxide\n\n**CAS No.:** 630080\n\n**PEL (ppm):** 25\n\n**PEL (mg/m\u00b3):** 29\n\n**Ceiling:** 200 ppm\n\n> 630080 | | Carbon monoxide | 25 | 29 | 200 ppm\n\nSource: \n", "cas_number": "630080", "ceiling": "200 ppm", "file": "carbon-monoxide-2.md", "generated": true, "harvested": "2026-08-05", "id": "carbon-monoxide-2", "pel_mgm3": "29", "pel_ppm": "25", "source_quote": "630080 | | Carbon monoxide | 25 | 29 | 200 ppm", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Carbon monoxide", "title": "Carbon monoxide \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Carbon monoxide\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Carbon monoxide\n\n**CAS No.:** 630-08-0\n\n> CAS No. 630-08-0\n\n**NIOSH REL (ppm):** TWA 35\n\n**NIOSH REL (mg/m\u00b3):** 40\n\n> NIOSH REL TWA 35 ppm (40 mg/m3) C 200 ppm (229 mg/m3)\n\nSource: \n", "cas_number": "630-08-0", "file": "carbon-monoxide-3.md", "generated": true, "harvested": "2026-09-08", "id": "carbon-monoxide-3", "quote_cas_number": "CAS No. 630-08-0", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Carbon monoxide", "rel_mgm3": "40", "rel_ppm": "TWA 35", "source_quote": "NIOSH REL TWA 35 ppm (40 mg/m3) C 200 ppm (229 mg/m3)", "sources": ["https://www.cdc.gov/niosh/npg/npgd0105.html"], "stale_after": "2027-09-08", "substance": "Carbon monoxide", "title": "Carbon monoxide \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Carbon monoxide\n\n**CAS No.:** 630-08-0\n\n**PEL (ppm):** 50\n\n**PEL (mg/m\u00b3):** 55\n\n> Carbon monoxide | 630-08-0 | 50 | 55 | - |\n\nSource: \n", "cas_number": "630-08-0", "file": "carbon-monoxide.md", "generated": true, "harvested": "2026-08-05", "id": "carbon-monoxide", "pel_mgm3": "55", "pel_ppm": "50", "source_quote": "Carbon monoxide | 630-08-0 | 50 | 55 | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Carbon monoxide", "title": "Carbon monoxide \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Carbon tetrabromide\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Carbon tetrabromide\n\n**CAS No.:** 558-13-4\n\n> CAS No. 558-13-4\n\n**NIOSH REL (ppm):** TWA 0.1\n\n**NIOSH REL (mg/m\u00b3):** 1.4\n\n> NIOSH REL TWA 0.1 ppm (1.4 mg/m3) ST 0.3 ppm (4 mg/m3)\n\nSource: \n", "cas_number": "558-13-4", "file": "carbon-tetrabromide-2.md", "generated": true, "harvested": "2026-09-08", "id": "carbon-tetrabromide-2", "quote_cas_number": "CAS No. 558-13-4", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Carbon tetrabromide", "rel_mgm3": "1.4", "rel_ppm": "TWA 0.1", "source_quote": "NIOSH REL TWA 0.1 ppm (1.4 mg/m3) ST 0.3 ppm (4 mg/m3)", "sources": ["https://www.cdc.gov/niosh/npg/npgd0106.html"], "stale_after": "2027-09-08", "substance": "Carbon tetrabromide", "title": "Carbon tetrabromide \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Carbon tetrabromide\n\n**CAS No.:** 558134\n\n**PEL (ppm):** 0.1\n\n**PEL (mg/m\u00b3):** 1.4\n\n**STEL (ppm):** 0.3\n\n**STEL (mg/m\u00b3):** 4\n\n> 558134 | | Carbon tetrabromide | 0.1 | 1.4 | | 0.3 | 4\n\nSource: \n", "cas_number": "558134", "file": "carbon-tetrabromide.md", "generated": true, "harvested": "2026-08-05", "id": "carbon-tetrabromide", "pel_mgm3": "1.4", "pel_ppm": "0.1", "source_quote": "558134 | | Carbon tetrabromide | 0.1 | 1.4 | | 0.3 | 4", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "stel_mgm3": "4", "stel_ppm": "0.3", "substance": "Carbon tetrabromide", "title": "Carbon tetrabromide \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Carbon tetrachloride\n\n**CAS No.:** 56235\n\n**PEL (ppm):** 2\n\n**PEL (mg/m\u00b3):** 12.6\n\n**Ceiling:** 200 ppm\n\n**STEL (ppm):** 10\n\n**STEL (mg/m\u00b3):** 63\n\n> 56235 | S | Carbon tetrachloride | 2 | 12.6 | 200 ppm | 10 | 63\n\nSource: \n", "cas_number": "56235", "ceiling": "200 ppm", "file": "carbon-tetrachloride-2.md", "generated": true, "harvested": "2026-08-05", "id": "carbon-tetrachloride-2", "pel_mgm3": "12.6", "pel_ppm": "2", "source_quote": "56235 | S | Carbon tetrachloride | 2 | 12.6 | 200 ppm | 10 | 63", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "stel_mgm3": "63", "stel_ppm": "10", "substance": "Carbon tetrachloride", "title": "Carbon tetrachloride \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Carbon tetrachloride\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Carbon tetrachloride\n\n**CAS No.:** 56-23-5\n\n> CAS No. 56-23-5\n\n**NIOSH REL (ppm):** ST 2\n\n**NIOSH REL (mg/m\u00b3):** 12.6\n\n> NIOSH REL Ca ST 2 ppm (12.6 mg/m3) [60-minute]\n\nSource: \n", "cas_number": "56-23-5", "file": "carbon-tetrachloride-3.md", "generated": true, "harvested": "2026-09-08", "id": "carbon-tetrachloride-3", "quote_cas_number": "CAS No. 56-23-5", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Carbon tetrachloride", "rel_mgm3": "12.6", "rel_ppm": "ST 2", "source_quote": "NIOSH REL Ca ST 2 ppm (12.6 mg/m3) [60-minute]", "sources": ["https://www.cdc.gov/niosh/npg/npgd0107.html"], "stale_after": "2027-09-08", "substance": "Carbon tetrachloride", "title": "Carbon tetrachloride \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Carbon tetrachloride\n\n**CAS No.:** 56-23-5\n\n> Carbon tetrachloride | 56-23-5 | - | (2) | - |\n\nSource: \n", "cas_number": "56-23-5", "file": "carbon-tetrachloride.md", "generated": true, "harvested": "2026-08-05", "id": "carbon-tetrachloride", "source_quote": "Carbon tetrachloride | 56-23-5 | - | (2) | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Carbon tetrachloride", "title": "Carbon tetrachloride \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Carbonyl chloride; see Phosgene\n\n**CAS No.:** 75445\n\n> 75445 | | Carbonyl chloride; see Phosgene\n\nSource: \n", "cas_number": "75445", "file": "carbonyl-chloride-see-phosgene.md", "generated": true, "harvested": "2026-08-05", "id": "carbonyl-chloride-see-phosgene", "source_quote": "75445 | | Carbonyl chloride; see Phosgene", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Carbonyl chloride; see Phosgene", "title": "Carbonyl chloride; see Phosgene \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Carbonyl fluoride\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Carbonyl fluoride\n\n**CAS No.:** 353-50-4\n\n> CAS No. 353-50-4\n\n**NIOSH REL (ppm):** TWA 2\n\n**NIOSH REL (mg/m\u00b3):** 5\n\n> NIOSH REL TWA 2 ppm (5 mg/m3) ST 5 ppm (15 mg/m3)\n\nSource: \n", "cas_number": "353-50-4", "file": "carbonyl-fluoride-2.md", "generated": true, "harvested": "2026-09-08", "id": "carbonyl-fluoride-2", "quote_cas_number": "CAS No. 353-50-4", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Carbonyl fluoride", "rel_mgm3": "5", "rel_ppm": "TWA 2", "source_quote": "NIOSH REL TWA 2 ppm (5 mg/m3) ST 5 ppm (15 mg/m3)", "sources": ["https://www.cdc.gov/niosh/npg/npgd0108.html"], "stale_after": "2027-09-08", "substance": "Carbonyl fluoride", "title": "Carbonyl fluoride \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Carbonyl fluoride\n\n**CAS No.:** 353504\n\n**PEL (ppm):** 2\n\n**PEL (mg/m\u00b3):** 5\n\n**STEL (ppm):** 5\n\n**STEL (mg/m\u00b3):** 15\n\n> 353504 | | Carbonyl fluoride | 2 | 5 | | 5 | 15\n\nSource: \n", "cas_number": "353504", "file": "carbonyl-fluoride.md", "generated": true, "harvested": "2026-08-05", "id": "carbonyl-fluoride", "pel_mgm3": "5", "pel_ppm": "2", "source_quote": "353504 | | Carbonyl fluoride | 2 | 5 | | 5 | 15", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "stel_mgm3": "15", "stel_ppm": "5", "substance": "Carbonyl fluoride", "title": "Carbonyl fluoride \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Catechol; pyrocatechol\n\n**CAS No.:** 120809\n\n**PEL (ppm):** 5\n\n**PEL (mg/m\u00b3):** 20\n\n> 120809 | S | Catechol; pyrocatechol | 5 | 20\n\nSource: \n", "cas_number": "120809", "file": "catechol-pyrocatechol.md", "generated": true, "harvested": "2026-08-05", "id": "catechol-pyrocatechol", "pel_mgm3": "20", "pel_ppm": "5", "source_quote": "120809 | S | Catechol; pyrocatechol | 5 | 20", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Catechol; pyrocatechol", "title": "Catechol; pyrocatechol \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Catechol\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Catechol\n\n**CAS No.:** 120-80-9\n\n> CAS No. 120-80-9\n\n**NIOSH REL (ppm):** TWA 5\n\n**NIOSH REL (mg/m\u00b3):** 20\n\n> NIOSH REL TWA 5 ppm (20 mg/m3) [skin]\n\nSource: \n", "cas_number": "120-80-9", "file": "catechol.md", "generated": true, "harvested": "2026-09-08", "id": "catechol", "quote_cas_number": "CAS No. 120-80-9", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Catechol", "rel_mgm3": "20", "rel_ppm": "TWA 5", "source_quote": "NIOSH REL TWA 5 ppm (20 mg/m3) [skin]", "sources": ["https://www.cdc.gov/niosh/npg/npgd0109.html"], "stale_after": "2027-09-08", "substance": "Catechol", "title": "Catechol \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Cellulose\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Cellulose\n\n**CAS No.:** 9004-34-6\n\n> CAS No. 9004-34-6\n\n**NIOSH REL, as stated:** TWA 10 mg/m3 (total) TWA 5 mg/m3 (resp)\n\n> NIOSH REL TWA 10 mg/m3 (total) TWA 5 mg/m3 (resp)\n\nSource: \n", "cas_number": "9004-34-6", "file": "cellulose-2.md", "generated": true, "harvested": "2026-09-08", "id": "cellulose-2", "quote_cas_number": "CAS No. 9004-34-6", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Cellulose", "rel_statement": "TWA 10 mg/m3 (total) TWA 5 mg/m3 (resp)", "source_quote": "NIOSH REL TWA 10 mg/m3 (total) TWA 5 mg/m3 (resp)", "sources": ["https://www.cdc.gov/niosh/npg/npgd0110.html"], "stale_after": "2027-09-08", "substance": "Cellulose", "title": "Cellulose \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Cellulose (paper fiber); see Particulates not otherwise regulated\n\n**CAS No.:** 9004346\n\n> 9004346 | | Cellulose (paper fiber); see Particulates not otherwise regulated\n\nSource: \n", "cas_number": "9004346", "file": "cellulose-paper-fiber-see-particulates-not-otherwise-regulated.md", "generated": true, "harvested": "2026-08-05", "id": "cellulose-paper-fiber-see-particulates-not-otherwise-regulated", "source_quote": "9004346 | | Cellulose (paper fiber); see Particulates not otherwise regulated", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Cellulose (paper fiber); see Particulates not otherwise regulated", "title": "Cellulose (paper fiber); see Particulates not otherwise regulated \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Cellulose\n\n**CAS No.:** 9004-34-6\n\n> Cellulose | 9004-34-6 | - | - | - |\n\nSource: \n", "cas_number": "9004-34-6", "file": "cellulose.md", "generated": true, "harvested": "2026-08-05", "id": "cellulose", "source_quote": "Cellulose | 9004-34-6 | - | - | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Cellulose", "title": "Cellulose \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Cesium hydroxide\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Cesium hydroxide\n\n**CAS No.:** 21351-79-1\n\n> CAS No. 21351-79-1\n\n**NIOSH REL (mg/m\u00b3):** TWA 2\n\n> NIOSH REL TWA 2 mg/m3\n\nSource: \n", "cas_number": "21351-79-1", "file": "cesium-hydroxide-2.md", "generated": true, "harvested": "2026-09-08", "id": "cesium-hydroxide-2", "quote_cas_number": "CAS No. 21351-79-1", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Cesium hydroxide", "rel_mgm3": "TWA 2", "source_quote": "NIOSH REL TWA 2 mg/m3", "sources": ["https://www.cdc.gov/niosh/npg/npgd0111.html"], "stale_after": "2027-09-08", "substance": "Cesium hydroxide", "title": "Cesium hydroxide \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Cesium hydroxide\n\n**CAS No.:** 21351791\n\n**PEL (ppm):** 2\n\n> 21351791 | | Cesium hydroxide | 2\n\nSource: \n", "cas_number": "21351791", "file": "cesium-hydroxide.md", "generated": true, "harvested": "2026-08-05", "id": "cesium-hydroxide", "pel_ppm": "2", "source_quote": "21351791 | | Cesium hydroxide | 2", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Cesium hydroxide", "title": "Cesium hydroxide \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Chlordane; 1,2,4,5,6,7,8,8-octachloro-3a,4,7,7a-tetrahydro-4,7-methanoindane\n\n**CAS No.:** 57749\n\n**PEL (mg/m\u00b3):** 0.5\n\n> 57749 | S | Chlordane; 1,2,4,5,6,7,8,8-octachloro-3a,4,7,7a-tetrahydro-4,7-methanoindane | -- | 0.5\n\nSource: \n", "cas_number": "57749", "file": "chlordane-1-2-4-5-6-7-8-8-octachloro-3a-4-7-7a-tetrahydro-4-7-methanoindane.md", "generated": true, "harvested": "2026-08-05", "id": "chlordane-1-2-4-5-6-7-8-8-octachloro-3a-4-7-7a-tetrahydro-4-7-methanoindane", "pel_mgm3": "0.5", "source_quote": "57749 | S | Chlordane; 1,2,4,5,6,7,8,8-octachloro-3a,4,7,7a-tetrahydro-4,7-methanoindane | -- | 0.5", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Chlordane; 1,2,4,5,6,7,8,8-octachloro-3a,4,7,7a-tetrahydro-4,7-methanoindane", "title": "Chlordane; 1,2,4,5,6,7,8,8-octachloro-3a,4,7,7a-tetrahydro-4,7-methanoindane \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Chlordane\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Chlordane\n\n**CAS No.:** 57-74-9\n\n> CAS No. 57-74-9\n\n**NIOSH REL (mg/m\u00b3):** TWA 0.5\n\n> NIOSH REL Ca TWA 0.5 mg/m3 [skin]\n\nSource: \n", "cas_number": "57-74-9", "file": "chlordane-2.md", "generated": true, "harvested": "2026-09-08", "id": "chlordane-2", "quote_cas_number": "CAS No. 57-74-9", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Chlordane", "rel_mgm3": "TWA 0.5", "source_quote": "NIOSH REL Ca TWA 0.5 mg/m3 [skin]", "sources": ["https://www.cdc.gov/niosh/npg/npgd0112.html"], "stale_after": "2027-09-08", "substance": "Chlordane", "title": "Chlordane \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Chlordane\n\n**CAS No.:** 57-74-9\n\n**PEL (mg/m\u00b3):** 0.5\n\n> Chlordane | 57-74-9 | - | 0.5 | X |\n\nSource: \n", "cas_number": "57-74-9", "file": "chlordane.md", "generated": true, "harvested": "2026-08-05", "id": "chlordane", "pel_mgm3": "0.5", "source_quote": "Chlordane | 57-74-9 | - | 0.5 | X |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Chlordane", "title": "Chlordane \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Chlorinated camphene\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Chlorinated camphene\n\n**CAS No.:** 8001-35-2\n\n> CAS No. 8001-35-2\n\n**NIOSH REL, as stated:** Ca [skin] See Appendix A\n\n> NIOSH REL Ca [skin] See Appendix A\n\nSource: \n", "cas_number": "8001-35-2", "file": "chlorinated-camphene-2.md", "generated": true, "harvested": "2026-09-08", "id": "chlorinated-camphene-2", "quote_cas_number": "CAS No. 8001-35-2", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Chlorinated camphene", "rel_statement": "Ca [skin] See Appendix A", "source_quote": "NIOSH REL Ca [skin] See Appendix A", "sources": ["https://www.cdc.gov/niosh/npg/npgd0113.html"], "stale_after": "2027-09-08", "substance": "Chlorinated camphene", "title": "Chlorinated camphene \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Chlorinated camphene; toxaphene\n\n**CAS No.:** 8001352\n\n**PEL (mg/m\u00b3):** 0.5\n\n**STEL (mg/m\u00b3):** 1\n\n> 8001352 | S | Chlorinated camphene; toxaphene | -- | 0.5 | | -- | 1\n\nSource: \n", "cas_number": "8001352", "file": "chlorinated-camphene-toxaphene.md", "generated": true, "harvested": "2026-08-05", "id": "chlorinated-camphene-toxaphene", "pel_mgm3": "0.5", "source_quote": "8001352 | S | Chlorinated camphene; toxaphene | -- | 0.5 | | -- | 1", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "stel_mgm3": "1", "substance": "Chlorinated camphene; toxaphene", "title": "Chlorinated camphene; toxaphene \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Chlorinated camphene\n\n**CAS No.:** 8001-35-2\n\n**PEL (mg/m\u00b3):** 0.5\n\n> Chlorinated camphene | 8001-35-2 | - | 0.5 | X |\n\nSource: \n", "cas_number": "8001-35-2", "file": "chlorinated-camphene.md", "generated": true, "harvested": "2026-08-05", "id": "chlorinated-camphene", "pel_mgm3": "0.5", "source_quote": "Chlorinated camphene | 8001-35-2 | - | 0.5 | X |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Chlorinated camphene", "title": "Chlorinated camphene \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Chlorinated diphenyl oxide\n\n**CAS No.:** 55720-99-5\n\n**PEL (mg/m\u00b3):** 0.5\n\n> Chlorinated diphenyl oxide | 55720-99-5 | - | 0.5 | - |\n\nSource: \n", "cas_number": "55720-99-5", "file": "chlorinated-diphenyl-oxide.md", "generated": true, "harvested": "2026-08-05", "id": "chlorinated-diphenyl-oxide", "pel_mgm3": "0.5", "source_quote": "Chlorinated diphenyl oxide | 55720-99-5 | - | 0.5 | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Chlorinated diphenyl oxide", "title": "Chlorinated diphenyl oxide \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Chlorine\n\n**CAS No.:** 7782505\n\n**PEL (ppm):** 0.5\n\n**PEL (mg/m\u00b3):** 1.5\n\n**STEL (ppm):** 1\n\n**STEL (mg/m\u00b3):** 3\n\n> 7782505 | | Chlorine | 0.5 | 1.5 | | 1 | 3\n\nSource: \n", "cas_number": "7782505", "file": "chlorine-2.md", "generated": true, "harvested": "2026-08-05", "id": "chlorine-2", "pel_mgm3": "1.5", "pel_ppm": "0.5", "source_quote": "7782505 | | Chlorine | 0.5 | 1.5 | | 1 | 3", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "stel_mgm3": "3", "stel_ppm": "1", "substance": "Chlorine", "title": "Chlorine \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Chlorine\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Chlorine\n\n**CAS No.:** 7782-50-5\n\n> CAS No. 7782-50-5\n\n**NIOSH REL (ppm):** C 0.5\n\n**NIOSH REL (mg/m\u00b3):** 1.45\n\n> NIOSH REL C 0.5 ppm (1.45 mg/m3) [15-minute]\n\nSource: \n", "cas_number": "7782-50-5", "file": "chlorine-3.md", "generated": true, "harvested": "2026-09-08", "id": "chlorine-3", "quote_cas_number": "CAS No. 7782-50-5", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Chlorine", "rel_mgm3": "1.45", "rel_ppm": "C 0.5", "source_quote": "NIOSH REL C 0.5 ppm (1.45 mg/m3) [15-minute]", "sources": ["https://www.cdc.gov/niosh/npg/npgd0115.html"], "stale_after": "2027-09-08", "substance": "Chlorine", "title": "Chlorine \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Chlorine dioxide\n\n**CAS No.:** 10049044\n\n**PEL (ppm):** 0.1\n\n**PEL (mg/m\u00b3):** 0.3\n\n**STEL (ppm):** 0.3\n\n**STEL (mg/m\u00b3):** 0.9\n\n> 10049044 | | Chlorine dioxide | 0.1 | 0.3 | | 0.3 | 0.9\n\nSource: \n", "cas_number": "10049044", "file": "chlorine-dioxide-2.md", "generated": true, "harvested": "2026-08-05", "id": "chlorine-dioxide-2", "pel_mgm3": "0.3", "pel_ppm": "0.1", "source_quote": "10049044 | | Chlorine dioxide | 0.1 | 0.3 | | 0.3 | 0.9", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "stel_mgm3": "0.9", "stel_ppm": "0.3", "substance": "Chlorine dioxide", "title": "Chlorine dioxide \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Chlorine dioxide\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Chlorine dioxide\n\n**CAS No.:** 10049-04-4\n\n> CAS No. 10049-04-4\n\n**NIOSH REL (ppm):** TWA 0.1\n\n**NIOSH REL (mg/m\u00b3):** 0.3\n\n> NIOSH REL TWA 0.1 ppm (0.3 mg/m3) ST 0.3 ppm (0.9 mg/m3)\n\nSource: \n", "cas_number": "10049-04-4", "file": "chlorine-dioxide-3.md", "generated": true, "harvested": "2026-09-08", "id": "chlorine-dioxide-3", "quote_cas_number": "CAS No. 10049-04-4", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Chlorine dioxide", "rel_mgm3": "0.3", "rel_ppm": "TWA 0.1", "source_quote": "NIOSH REL TWA 0.1 ppm (0.3 mg/m3) ST 0.3 ppm (0.9 mg/m3)", "sources": ["https://www.cdc.gov/niosh/npg/npgd0116.html"], "stale_after": "2027-09-08", "substance": "Chlorine dioxide", "title": "Chlorine dioxide \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Chlorine dioxide\n\n**CAS No.:** 10049-04-4\n\n**PEL (ppm):** 0.1\n\n**PEL (mg/m\u00b3):** 0.3\n\n> Chlorine dioxide | 10049-04-4 | 0.1 | 0.3 | - |\n\nSource: \n", "cas_number": "10049-04-4", "file": "chlorine-dioxide.md", "generated": true, "harvested": "2026-08-05", "id": "chlorine-dioxide", "pel_mgm3": "0.3", "pel_ppm": "0.1", "source_quote": "Chlorine dioxide | 10049-04-4 | 0.1 | 0.3 | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Chlorine dioxide", "title": "Chlorine dioxide \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Chlorine trifluoride\n\n**CAS No.:** 7790912\n\n**PEL (ppm):** 0.1\n\n**PEL (mg/m\u00b3):** 0.4\n\n**Ceiling:** C\n\n> 7790912 | | Chlorine trifluoride | 0.1 | 0.4 | C\n\nSource: \n", "cas_number": "7790912", "ceiling": "C", "file": "chlorine-trifluoride-2.md", "generated": true, "harvested": "2026-08-05", "id": "chlorine-trifluoride-2", "pel_mgm3": "0.4", "pel_ppm": "0.1", "source_quote": "7790912 | | Chlorine trifluoride | 0.1 | 0.4 | C", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Chlorine trifluoride", "title": "Chlorine trifluoride \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Chlorine trifluoride\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Chlorine trifluoride\n\n**CAS No.:** 7790-91-2\n\n> CAS No. 7790-91-2\n\n**NIOSH REL (ppm):** C 0.1\n\n**NIOSH REL (mg/m\u00b3):** 0.4\n\n> NIOSH REL C 0.1 ppm (0.4 mg/m\u00b3)\n\nSource: \n", "cas_number": "7790-91-2", "file": "chlorine-trifluoride-3.md", "generated": true, "harvested": "2026-09-08", "id": "chlorine-trifluoride-3", "quote_cas_number": "CAS No. 7790-91-2", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Chlorine trifluoride", "rel_mgm3": "0.4", "rel_ppm": "C 0.1", "source_quote": "NIOSH REL C 0.1 ppm (0.4 mg/m\u00b3)", "sources": ["https://www.cdc.gov/niosh/npg/npgd0117.html"], "stale_after": "2027-09-08", "substance": "Chlorine trifluoride", "title": "Chlorine trifluoride \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Chlorine trifluoride\n\n**CAS No.:** 7790-91-2\n\n**PEL (ppm):** (C)0.1\n\n**PEL (mg/m\u00b3):** (C)0.4\n\n> Chlorine trifluoride | 7790-91-2 | (C)0.1 | (C)0.4 | - |\n\nSource: \n", "cas_number": "7790-91-2", "file": "chlorine-trifluoride.md", "generated": true, "harvested": "2026-08-05", "id": "chlorine-trifluoride", "pel_mgm3": "(C)0.4", "pel_ppm": "(C)0.1", "source_quote": "Chlorine trifluoride | 7790-91-2 | (C)0.1 | (C)0.4 | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Chlorine trifluoride", "title": "Chlorine trifluoride \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Chlorine\n\n**CAS No.:** 7782-50-5\n\n**PEL (ppm):** (C)1\n\n**PEL (mg/m\u00b3):** (C)3\n\n> Chlorine | 7782-50-5 | (C)1 | (C)3 | - |\n\nSource: \n", "cas_number": "7782-50-5", "file": "chlorine.md", "generated": true, "harvested": "2026-08-05", "id": "chlorine", "pel_mgm3": "(C)3", "pel_ppm": "(C)1", "source_quote": "Chlorine | 7782-50-5 | (C)1 | (C)3 | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Chlorine", "title": "Chlorine \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Chloroacetaldehyde\n\n**CAS No.:** 107200\n\n**PEL (ppm):** 1\n\n**PEL (mg/m\u00b3):** 3\n\n**Ceiling:** C\n\n> 107200 | | Chloroacetaldehyde | 1 | 3 | C\n\nSource: \n", "cas_number": "107200", "ceiling": "C", "file": "chloroacetaldehyde-2.md", "generated": true, "harvested": "2026-08-05", "id": "chloroacetaldehyde-2", "pel_mgm3": "3", "pel_ppm": "1", "source_quote": "107200 | | Chloroacetaldehyde | 1 | 3 | C", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Chloroacetaldehyde", "title": "Chloroacetaldehyde \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Chloroacetaldehyde\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Chloroacetaldehyde\n\n**CAS No.:** 107-20-0\n\n> CAS No. 107-20-0\n\n**NIOSH REL (ppm):** C 1\n\n**NIOSH REL (mg/m\u00b3):** 3\n\n> NIOSH REL C 1 ppm (3 mg/m3)\n\nSource: \n", "cas_number": "107-20-0", "file": "chloroacetaldehyde-3.md", "generated": true, "harvested": "2026-09-08", "id": "chloroacetaldehyde-3", "quote_cas_number": "CAS No. 107-20-0", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Chloroacetaldehyde", "rel_mgm3": "3", "rel_ppm": "C 1", "source_quote": "NIOSH REL C 1 ppm (3 mg/m3)", "sources": ["https://www.cdc.gov/niosh/npg/npgd0118.html"], "stale_after": "2027-09-08", "substance": "Chloroacetaldehyde", "title": "Chloroacetaldehyde \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Chloroacetaldehyde\n\n**CAS No.:** 107-20-0\n\n**PEL (ppm):** (C)1\n\n**PEL (mg/m\u00b3):** (C)3\n\n> Chloroacetaldehyde | 107-20-0 | (C)1 | (C)3 | - |\n\nSource: \n", "cas_number": "107-20-0", "file": "chloroacetaldehyde.md", "generated": true, "harvested": "2026-08-05", "id": "chloroacetaldehyde", "pel_mgm3": "(C)3", "pel_ppm": "(C)1", "source_quote": "Chloroacetaldehyde | 107-20-0 | (C)1 | (C)3 | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Chloroacetaldehyde", "title": "Chloroacetaldehyde \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Chloroacetone\n\n**CAS No.:** 78955\n\n**PEL (ppm):** 1\n\n**PEL (mg/m\u00b3):** 3.8\n\n**Ceiling:** C\n\n> 78955 | S | Chloroacetone | 1 | 3.8 | C\n\nSource: \n", "cas_number": "78955", "ceiling": "C", "file": "chloroacetone.md", "generated": true, "harvested": "2026-08-05", "id": "chloroacetone", "pel_mgm3": "3.8", "pel_ppm": "1", "source_quote": "78955 | S | Chloroacetone | 1 | 3.8 | C", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Chloroacetone", "title": "Chloroacetone \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Chloroacetyl chloride\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Chloroacetyl chloride\n\n**CAS No.:** 79-04-9\n\n> CAS No. 79-04-9\n\n**NIOSH REL (ppm):** TWA 0.05\n\n**NIOSH REL (mg/m\u00b3):** 0.2\n\n> NIOSH REL TWA 0.05 ppm (0.2 mg/m\u00b3)\n\nSource: \n", "cas_number": "79-04-9", "file": "chloroacetyl-chloride-2.md", "generated": true, "harvested": "2026-09-08", "id": "chloroacetyl-chloride-2", "quote_cas_number": "CAS No. 79-04-9", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Chloroacetyl chloride", "rel_mgm3": "0.2", "rel_ppm": "TWA 0.05", "source_quote": "NIOSH REL TWA 0.05 ppm (0.2 mg/m\u00b3)", "sources": ["https://www.cdc.gov/niosh/npg/npgd0120.html"], "stale_after": "2027-09-08", "substance": "Chloroacetyl chloride", "title": "Chloroacetyl chloride \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Chloroacetyl chloride\n\n**CAS No.:** 79049\n\n**PEL (ppm):** 0.05\n\n**PEL (mg/m\u00b3):** 0.2\n\n**STEL (ppm):** 0.15\n\n**STEL (mg/m\u00b3):** 0.69\n\n> 79049 | S | Chloroacetyl chloride | 0.05 | 0.2 | | 0.15 | 0.69\n\nSource: \n", "cas_number": "79049", "file": "chloroacetyl-chloride.md", "generated": true, "harvested": "2026-08-05", "id": "chloroacetyl-chloride", "pel_mgm3": "0.2", "pel_ppm": "0.05", "source_quote": "79049 | S | Chloroacetyl chloride | 0.05 | 0.2 | | 0.15 | 0.69", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "stel_mgm3": "0.69", "stel_ppm": "0.15", "substance": "Chloroacetyl chloride", "title": "Chloroacetyl chloride \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Chlorobenzene\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Chlorobenzene\n\n**CAS No.:** 108-90-7\n\n> CAS No. 108-90-7\n\n**NIOSH REL, as stated:** See Appendix D\n\n> NIOSH REL See Appendix D\n\nSource: \n", "cas_number": "108-90-7", "file": "chlorobenzene-2.md", "generated": true, "harvested": "2026-09-08", "id": "chlorobenzene-2", "quote_cas_number": "CAS No. 108-90-7", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Chlorobenzene", "rel_statement": "See Appendix D", "source_quote": "NIOSH REL See Appendix D", "sources": ["https://www.cdc.gov/niosh/npg/npgd0121.html"], "stale_after": "2027-09-08", "substance": "Chlorobenzene", "title": "Chlorobenzene \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Chlorobenzene; monochlorobenzene\n\n**CAS No.:** 108907\n\n**PEL (ppm):** 10\n\n**PEL (mg/m\u00b3):** 46\n\n> 108907 | | Chlorobenzene; monochlorobenzene | 10 | 46\n\nSource: \n", "cas_number": "108907", "file": "chlorobenzene-monochlorobenzene.md", "generated": true, "harvested": "2026-08-05", "id": "chlorobenzene-monochlorobenzene", "pel_mgm3": "46", "pel_ppm": "10", "source_quote": "108907 | | Chlorobenzene; monochlorobenzene | 10 | 46", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Chlorobenzene; monochlorobenzene", "title": "Chlorobenzene; monochlorobenzene \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Chlorobenzene\n\n**CAS No.:** 108-90-7\n\n**PEL (ppm):** 75\n\n**PEL (mg/m\u00b3):** 350\n\n> Chlorobenzene | 108-90-7 | 75 | 350 | - |\n\nSource: \n", "cas_number": "108-90-7", "file": "chlorobenzene.md", "generated": true, "harvested": "2026-08-05", "id": "chlorobenzene", "pel_mgm3": "350", "pel_ppm": "75", "source_quote": "Chlorobenzene | 108-90-7 | 75 | 350 | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Chlorobenzene", "title": "Chlorobenzene \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Chlorobromomethane\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Chlorobromomethane\n\n**CAS No.:** 74-97-5\n\n> CAS No. 74-97-5\n\n**NIOSH REL (ppm):** TWA 200\n\n**NIOSH REL (mg/m\u00b3):** 1050\n\n> NIOSH REL TWA 200 ppm (1050 mg/m3)\n\nSource: \n", "cas_number": "74-97-5", "file": "chlorobromomethane-2.md", "generated": true, "harvested": "2026-09-08", "id": "chlorobromomethane-2", "quote_cas_number": "CAS No. 74-97-5", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Chlorobromomethane", "rel_mgm3": "1050", "rel_ppm": "TWA 200", "source_quote": "NIOSH REL TWA 200 ppm (1050 mg/m3)", "sources": ["https://www.cdc.gov/niosh/npg/npgd0123.html"], "stale_after": "2027-09-08", "substance": "Chlorobromomethane", "title": "Chlorobromomethane \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Chlorobromomethane; bromochloromethane\n\n**CAS No.:** 74975\n\n**PEL (ppm):** 200\n\n**PEL (mg/m\u00b3):** 1,050\n\n> 74975 | | Chlorobromomethane; bromochloromethane | 200 | 1,050\n\nSource: \n", "cas_number": "74975", "file": "chlorobromomethane-bromochloromethane.md", "generated": true, "harvested": "2026-08-05", "id": "chlorobromomethane-bromochloromethane", "pel_mgm3": "1,050", "pel_ppm": "200", "source_quote": "74975 | | Chlorobromomethane; bromochloromethane | 200 | 1,050", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Chlorobromomethane; bromochloromethane", "title": "Chlorobromomethane; bromochloromethane \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Chlorobromomethane\n\n**CAS No.:** 74-97-5\n\n**PEL (ppm):** 200\n\n**PEL (mg/m\u00b3):** 1050\n\n> Chlorobromomethane | 74-97-5 | 200 | 1050 | - |\n\nSource: \n", "cas_number": "74-97-5", "file": "chlorobromomethane.md", "generated": true, "harvested": "2026-08-05", "id": "chlorobromomethane", "pel_mgm3": "1050", "pel_ppm": "200", "source_quote": "Chlorobromomethane | 74-97-5 | 200 | 1050 | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Chlorobromomethane", "title": "Chlorobromomethane \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Chlorodifluoromethane; Fluorocarbon 22\n\n**CAS No.:** 75456\n\n**PEL (ppm):** 1,000\n\n**PEL (mg/m\u00b3):** 3,500\n\n> 75456 | | Chlorodifluoromethane; Fluorocarbon 22 | 1,000 | 3,500\n\nSource: \n", "cas_number": "75456", "file": "chlorodifluoromethane-fluorocarbon-22.md", "generated": true, "harvested": "2026-08-05", "id": "chlorodifluoromethane-fluorocarbon-22", "pel_mgm3": "3,500", "pel_ppm": "1,000", "source_quote": "75456 | | Chlorodifluoromethane; Fluorocarbon 22 | 1,000 | 3,500", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Chlorodifluoromethane; Fluorocarbon 22", "title": "Chlorodifluoromethane; Fluorocarbon 22 \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Chlorodifluoromethane\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Chlorodifluoromethane\n\n**CAS No.:** 75-45-6\n\n> CAS No. 75-45-6\n\n**NIOSH REL (ppm):** TWA 1000\n\n**NIOSH REL (mg/m\u00b3):** 3500\n\n> NIOSH REL TWA 1000 ppm (3500 mg/m3) ST 1250 ppm (4375 mg/m3)\n\nSource: \n", "cas_number": "75-45-6", "file": "chlorodifluoromethane.md", "generated": true, "harvested": "2026-09-08", "id": "chlorodifluoromethane", "quote_cas_number": "CAS No. 75-45-6", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Chlorodifluoromethane", "rel_mgm3": "3500", "rel_ppm": "TWA 1000", "source_quote": "NIOSH REL TWA 1000 ppm (3500 mg/m3) ST 1250 ppm (4375 mg/m3)", "sources": ["https://www.cdc.gov/niosh/npg/npgd0124.html"], "stale_after": "2027-09-08", "substance": "Chlorodifluoromethane", "title": "Chlorodifluoromethane \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Chlorodiphenyl (42% chlorine)\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Chlorodiphenyl (42% chlorine)\n\n**CAS No.:** 53469-21-9\n\n> CAS No. 53469-21-9\n\n**NIOSH REL (mg/m\u00b3):** TWA 0.001\n\n> NIOSH REL Ca TWA 0.001 mg/m3\n\nSource: \n", "cas_number": "53469-21-9", "file": "chlorodiphenyl-42-chlorine-2.md", "generated": true, "harvested": "2026-09-08", "id": "chlorodiphenyl-42-chlorine-2", "quote_cas_number": "CAS No. 53469-21-9", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Chlorodiphenyl (42% chlorine)", "rel_mgm3": "TWA 0.001", "source_quote": "NIOSH REL Ca TWA 0.001 mg/m3", "sources": ["https://www.cdc.gov/niosh/npg/npgd0125.html"], "stale_after": "2027-09-08", "substance": "Chlorodiphenyl (42% chlorine)", "title": "Chlorodiphenyl (42% chlorine) \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Chlorodiphenyl (42% Chlorine) (PCB)\n\n**CAS No.:** 53469-21-9\n\n**PEL (mg/m\u00b3):** 1\n\n> Chlorodiphenyl (42% Chlorine) (PCB) | 53469-21-9 | - | 1 | X |\n\nSource: \n", "cas_number": "53469-21-9", "file": "chlorodiphenyl-42-chlorine-pcb.md", "generated": true, "harvested": "2026-08-05", "id": "chlorodiphenyl-42-chlorine-pcb", "pel_mgm3": "1", "source_quote": "Chlorodiphenyl (42% Chlorine) (PCB) | 53469-21-9 | - | 1 | X |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Chlorodiphenyl (42% Chlorine) (PCB)", "title": "Chlorodiphenyl (42% Chlorine) (PCB) \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Chlorodiphenyl (42% chlorine)\n\n**CAS No.:** 53469219\n\n**PEL (mg/m\u00b3):** 1\n\n> 53469219 | S | Chlorodiphenyl (42% chlorine) | -- | 1\n\nSource: \n", "cas_number": "53469219", "file": "chlorodiphenyl-42-chlorine.md", "generated": true, "harvested": "2026-08-05", "id": "chlorodiphenyl-42-chlorine", "pel_mgm3": "1", "source_quote": "53469219 | S | Chlorodiphenyl (42% chlorine) | -- | 1", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Chlorodiphenyl (42% chlorine)", "title": "Chlorodiphenyl (42% chlorine) \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Chlorodiphenyl (54% chlorine)\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Chlorodiphenyl (54% chlorine)\n\n**CAS No.:** 11097-69-1\n\n> CAS No. 11097-69-1\n\n**NIOSH REL (mg/m\u00b3):** TWA 0.001\n\n> NIOSH REL Ca TWA 0.001 mg/m3\n\nSource: \n", "cas_number": "11097-69-1", "file": "chlorodiphenyl-54-chlorine-2.md", "generated": true, "harvested": "2026-09-08", "id": "chlorodiphenyl-54-chlorine-2", "quote_cas_number": "CAS No. 11097-69-1", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Chlorodiphenyl (54% chlorine)", "rel_mgm3": "TWA 0.001", "source_quote": "NIOSH REL Ca TWA 0.001 mg/m3", "sources": ["https://www.cdc.gov/niosh/npg/npgd0126.html"], "stale_after": "2027-09-08", "substance": "Chlorodiphenyl (54% chlorine)", "title": "Chlorodiphenyl (54% chlorine) \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Chlorodiphenyl (54% Chlorine) (PCB)\n\n**CAS No.:** 11097-69-1\n\n**PEL (mg/m\u00b3):** 0.5\n\n> Chlorodiphenyl (54% Chlorine) (PCB) | 11097-69-1 | - | 0.5 | X |\n\nSource: \n", "cas_number": "11097-69-1", "file": "chlorodiphenyl-54-chlorine-pcb.md", "generated": true, "harvested": "2026-08-05", "id": "chlorodiphenyl-54-chlorine-pcb", "pel_mgm3": "0.5", "source_quote": "Chlorodiphenyl (54% Chlorine) (PCB) | 11097-69-1 | - | 0.5 | X |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Chlorodiphenyl (54% Chlorine) (PCB)", "title": "Chlorodiphenyl (54% Chlorine) (PCB) \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Chlorodiphenyl (54% chlorine)\n\n**CAS No.:** 11097691\n\n**PEL (mg/m\u00b3):** 0.5\n\n> 11097691 | S | Chlorodiphenyl (54% chlorine) | -- | 0.5\n\nSource: \n", "cas_number": "11097691", "file": "chlorodiphenyl-54-chlorine.md", "generated": true, "harvested": "2026-08-05", "id": "chlorodiphenyl-54-chlorine", "pel_mgm3": "0.5", "source_quote": "11097691 | S | Chlorodiphenyl (54% chlorine) | -- | 0.5", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Chlorodiphenyl (54% chlorine)", "title": "Chlorodiphenyl (54% chlorine) \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Chloroethane; see Ethyl chloride\n\n**CAS No.:** 75003\n\n> 75003 | | Chloroethane; see Ethyl chloride\n\nSource: \n", "cas_number": "75003", "file": "chloroethane-see-ethyl-chloride.md", "generated": true, "harvested": "2026-08-05", "id": "chloroethane-see-ethyl-chloride", "source_quote": "75003 | | Chloroethane; see Ethyl chloride", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Chloroethane; see Ethyl chloride", "title": "Chloroethane; see Ethyl chloride \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Chloroethylene, see Vinyl chloride, Section 5210\n\n**CAS No.:** 75014\n\n> 75014 | | Chloroethylene, see Vinyl chloride, Section 5210\n\nSource: \n", "cas_number": "75014", "file": "chloroethylene-see-vinyl-chloride-section-5210.md", "generated": true, "harvested": "2026-08-05", "id": "chloroethylene-see-vinyl-chloride-section-5210", "source_quote": "75014 | | Chloroethylene, see Vinyl chloride, Section 5210", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Chloroethylene, see Vinyl chloride, Section 5210", "title": "Chloroethylene, see Vinyl chloride, Section 5210 \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Chloroform; trichloromethane\n\n**CAS No.:** 67663\n\n**PEL (ppm):** 2\n\n**PEL (mg/m\u00b3):** 9.78\n\n> 67663 | | Chloroform; trichloromethane | 2 | 9.78\n\nSource: \n", "cas_number": "67663", "file": "chloroform-trichloromethane-2.md", "generated": true, "harvested": "2026-08-05", "id": "chloroform-trichloromethane-2", "pel_mgm3": "9.78", "pel_ppm": "2", "source_quote": "67663 | | Chloroform; trichloromethane | 2 | 9.78", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Chloroform; trichloromethane", "title": "Chloroform; trichloromethane \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Chloroform (Trichloromethane)\n\n**CAS No.:** 67-66-3\n\n**PEL (ppm):** (C)50\n\n**PEL (mg/m\u00b3):** (C)240\n\n> Chloroform (Trichloromethane) | 67-66-3 | (C)50 | (C)240 | - |\n\nSource: \n", "cas_number": "67-66-3", "file": "chloroform-trichloromethane.md", "generated": true, "harvested": "2026-08-05", "id": "chloroform-trichloromethane", "pel_mgm3": "(C)240", "pel_ppm": "(C)50", "source_quote": "Chloroform (Trichloromethane) | 67-66-3 | (C)50 | (C)240 | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Chloroform (Trichloromethane)", "title": "Chloroform (Trichloromethane) \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Chloroform\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Chloroform\n\n**CAS No.:** 67-66-3\n\n> CAS No. 67-66-3\n\n**NIOSH REL (ppm):** ST 2\n\n**NIOSH REL (mg/m\u00b3):** 9.78\n\n> NIOSH REL Ca ST 2 ppm (9.78 mg/m3) [60-minute]\n\nSource: \n", "cas_number": "67-66-3", "file": "chloroform.md", "generated": true, "harvested": "2026-09-08", "id": "chloroform", "quote_cas_number": "CAS No. 67-66-3", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Chloroform", "rel_mgm3": "9.78", "rel_ppm": "ST 2", "source_quote": "NIOSH REL Ca ST 2 ppm (9.78 mg/m3) [60-minute]", "sources": ["https://www.cdc.gov/niosh/npg/npgd0127.html"], "stale_after": "2027-09-08", "substance": "Chloroform", "title": "Chloroform \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Chloromethane, see Methyl chloride\n\n**CAS No.:** 74873\n\n> 74873 | | Chloromethane, see Methyl chloride\n\nSource: \n", "cas_number": "74873", "file": "chloromethane-see-methyl-chloride.md", "generated": true, "harvested": "2026-08-05", "id": "chloromethane-see-methyl-chloride", "source_quote": "74873 | | Chloromethane, see Methyl chloride", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Chloromethane, see Methyl chloride", "title": "Chloromethane, see Methyl chloride \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Chloromethyl methyl ether; see 1910.1006\n\n**CAS No.:** 107-30-2\n\n> Chloromethyl methyl ether; see 1910.1006 | 107-30-2 | - | - | - |\n\nSource: \n", "cas_number": "107-30-2", "file": "chloromethyl-methyl-ether-see-1910-1006.md", "generated": true, "harvested": "2026-08-05", "id": "chloromethyl-methyl-ether-see-1910-1006", "source_quote": "Chloromethyl methyl ether; see 1910.1006 | 107-30-2 | - | - | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Chloromethyl methyl ether; see 1910.1006", "title": "Chloromethyl methyl ether; see 1910.1006 \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Chloromethyl methyl ether; see Methyl chloromethyl ether, Section 5209\n\n**CAS No.:** 107302\n\n> 107302 | | Chloromethyl methyl ether; see Methyl chloromethyl ether, Section 5209\n\nSource: \n", "cas_number": "107302", "file": "chloromethyl-methyl-ether-see-methyl-chloromethyl-ether-section-5209.md", "generated": true, "harvested": "2026-08-05", "id": "chloromethyl-methyl-ether-see-methyl-chloromethyl-ether-section-5209", "source_quote": "107302 | | Chloromethyl methyl ether; see Methyl chloromethyl ether, Section 5209", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Chloromethyl methyl ether; see Methyl chloromethyl ether, Section 5209", "title": "Chloromethyl methyl ether; see Methyl chloromethyl ether, Section 5209 \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Chloromethyl methyl ether\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Chloromethyl methyl ether\n\n**CAS No.:** 107-30-2\n\n> CAS No. 107-30-2\n\n**NIOSH REL, as stated:** Ca See Appendix A\n\n> NIOSH REL Ca See Appendix A\n\nSource: \n", "cas_number": "107-30-2", "file": "chloromethyl-methyl-ether.md", "generated": true, "harvested": "2026-09-08", "id": "chloromethyl-methyl-ether", "quote_cas_number": "CAS No. 107-30-2", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Chloromethyl methyl ether", "rel_statement": "Ca See Appendix A", "source_quote": "NIOSH REL Ca See Appendix A", "sources": ["https://www.cdc.gov/niosh/npg/npgd0129.html"], "stale_after": "2027-09-08", "substance": "Chloromethyl methyl ether", "title": "Chloromethyl methyl ether \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Chloropentafluoroethane\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Chloropentafluoroethane\n\n**CAS No.:** 76-15-3\n\n> CAS No. 76-15-3\n\n**NIOSH REL (ppm):** TWA 1000\n\n**NIOSH REL (mg/m\u00b3):** 6320\n\n> NIOSH REL TWA 1000 ppm (6320 mg/m3)\n\nSource: \n", "cas_number": "76-15-3", "file": "chloropentafluoroethane-2.md", "generated": true, "harvested": "2026-09-08", "id": "chloropentafluoroethane-2", "quote_cas_number": "CAS No. 76-15-3", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Chloropentafluoroethane", "rel_mgm3": "6320", "rel_ppm": "TWA 1000", "source_quote": "NIOSH REL TWA 1000 ppm (6320 mg/m3)", "sources": ["https://www.cdc.gov/niosh/npg/npgd0131.html"], "stale_after": "2027-09-08", "substance": "Chloropentafluoroethane", "title": "Chloropentafluoroethane \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Chloropentafluoroethane\n\n**CAS No.:** 76153\n\n**PEL (ppm):** 1,000\n\n**PEL (mg/m\u00b3):** 6,320\n\n> 76153 | | Chloropentafluoroethane | 1,000 | 6,320\n\nSource: \n", "cas_number": "76153", "file": "chloropentafluoroethane.md", "generated": true, "harvested": "2026-08-05", "id": "chloropentafluoroethane", "pel_mgm3": "6,320", "pel_ppm": "1,000", "source_quote": "76153 | | Chloropentafluoroethane | 1,000 | 6,320", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Chloropentafluoroethane", "title": "Chloropentafluoroethane \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Chloropicrin\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Chloropicrin\n\n**CAS No.:** 76-06-2\n\n> CAS No. 76-06-2\n\n**NIOSH REL (ppm):** TWA 0.1\n\n**NIOSH REL (mg/m\u00b3):** 0.7\n\n> NIOSH REL TWA 0.1 ppm (0.7 mg/m3)\n\nSource: \n", "cas_number": "76-06-2", "file": "chloropicrin-2.md", "generated": true, "harvested": "2026-09-08", "id": "chloropicrin-2", "quote_cas_number": "CAS No. 76-06-2", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Chloropicrin", "rel_mgm3": "0.7", "rel_ppm": "TWA 0.1", "source_quote": "NIOSH REL TWA 0.1 ppm (0.7 mg/m3)", "sources": ["https://www.cdc.gov/niosh/npg/npgd0132.html"], "stale_after": "2027-09-08", "substance": "Chloropicrin", "title": "Chloropicrin \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Chloropicrin; trichloronitromethane\n\n**CAS No.:** 76062\n\n**PEL (ppm):** 0.1\n\n**PEL (mg/m\u00b3):** 0.7\n\n> 76062 | | Chloropicrin; trichloronitromethane | 0.1 | 0.7\n\nSource: \n", "cas_number": "76062", "file": "chloropicrin-trichloronitromethane.md", "generated": true, "harvested": "2026-08-05", "id": "chloropicrin-trichloronitromethane", "pel_mgm3": "0.7", "pel_ppm": "0.1", "source_quote": "76062 | | Chloropicrin; trichloronitromethane | 0.1 | 0.7", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Chloropicrin; trichloronitromethane", "title": "Chloropicrin; trichloronitromethane \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Chloropicrin\n\n**CAS No.:** 76-06-2\n\n**PEL (ppm):** 0.1\n\n**PEL (mg/m\u00b3):** 0.7\n\n> Chloropicrin | 76-06-2 | 0.1 | 0.7 | - |\n\nSource: \n", "cas_number": "76-06-2", "file": "chloropicrin.md", "generated": true, "harvested": "2026-08-05", "id": "chloropicrin", "pel_mgm3": "0.7", "pel_ppm": "0.1", "source_quote": "Chloropicrin | 76-06-2 | 0.1 | 0.7 | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Chloropicrin", "title": "Chloropicrin \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Chloroprene; 2-chloro-1,3-butadiene\n\n**CAS No.:** 126998\n\n**PEL (ppm):** 10\n\n**PEL (mg/m\u00b3):** 36\n\n> 126998 | S | Chloroprene; 2-chloro-1,3-butadiene | 10 | 36\n\nSource: \n", "cas_number": "126998", "file": "chloroprene-2-chloro-1-3-butadiene.md", "generated": true, "harvested": "2026-08-05", "id": "chloroprene-2-chloro-1-3-butadiene", "pel_mgm3": "36", "pel_ppm": "10", "source_quote": "126998 | S | Chloroprene; 2-chloro-1,3-butadiene | 10 | 36", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Chloroprene; 2-chloro-1,3-butadiene", "title": "Chloroprene; 2-chloro-1,3-butadiene \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Chlorpyrifos\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Chlorpyrifos\n\n**CAS No.:** 2921-88-2\n\n> CAS No. 2921-88-2\n\n**NIOSH REL (mg/m\u00b3):** TWA 0.2\n\n> NIOSH REL TWA 0.2 mg/m3 ST 0.6 mg/m3 [skin]\n\nSource: \n", "cas_number": "2921-88-2", "file": "chlorpyrifos-2.md", "generated": true, "harvested": "2026-09-08", "id": "chlorpyrifos-2", "quote_cas_number": "CAS No. 2921-88-2", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Chlorpyrifos", "rel_mgm3": "TWA 0.2", "source_quote": "NIOSH REL TWA 0.2 mg/m3 ST 0.6 mg/m3 [skin]", "sources": ["https://www.cdc.gov/niosh/npg/npgd0137.html"], "stale_after": "2027-09-08", "substance": "Chlorpyrifos", "title": "Chlorpyrifos \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Chlorpyrifos\n\n**CAS No.:** 2921882\n\n**PEL (mg/m\u00b3):** 0.2\n\n> 2921882 | S | Chlorpyrifos | -- | 0.2\n\nSource: \n", "cas_number": "2921882", "file": "chlorpyrifos.md", "generated": true, "harvested": "2026-08-05", "id": "chlorpyrifos", "pel_mgm3": "0.2", "source_quote": "2921882 | S | Chlorpyrifos | -- | 0.2", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Chlorpyrifos", "title": "Chlorpyrifos \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Chromic acid and chromates\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Chromic acid and chromates\n\n**CAS No.:** 1333-82-0 (CrO3)\n\n> CAS No. 1333-82-0 (CrO3)\n\n**NIOSH REL (mg/m\u00b3):** TWA 0.0002\n\n> NIOSH REL (as Cr): Ca TWA 0.0002 mg/m3 (8-hours)\n\nSource: \n", "cas_number": "1333-82-0 (CrO3)", "file": "chromic-acid-and-chromates.md", "generated": true, "harvested": "2026-09-08", "id": "chromic-acid-and-chromates", "quote_cas_number": "CAS No. 1333-82-0 (CrO3)", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Chromic acid and chromates", "rel_mgm3": "TWA 0.0002", "source_quote": "NIOSH REL (as Cr): Ca TWA 0.0002 mg/m3 (8-hours)", "sources": ["https://www.cdc.gov/niosh/npg/npgd0138.html"], "stale_after": "2027-09-08", "substance": "Chromic acid and chromates", "title": "Chromic acid and chromates \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Chromium metal\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Chromium metal\n\n**CAS No.:** 7440-47-3\n\n> CAS No. 7440-47-3\n\n**NIOSH REL (mg/m\u00b3):** TWA 0.5\n\n> NIOSH REL TWA 0.5 mg/m3\n\nSource: \n", "cas_number": "7440-47-3", "file": "chromium-metal-2.md", "generated": true, "harvested": "2026-09-08", "id": "chromium-metal-2", "quote_cas_number": "CAS No. 7440-47-3", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Chromium metal", "rel_mgm3": "TWA 0.5", "source_quote": "NIOSH REL TWA 0.5 mg/m3", "sources": ["https://www.cdc.gov/niosh/npg/npgd0141.html"], "stale_after": "2027-09-08", "substance": "Chromium metal", "title": "Chromium metal \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Chromium metal and insol. salts (as Cr)\n\n**CAS No.:** 7440-47-3\n\n**PEL (mg/m\u00b3):** 1\n\n> Chromium metal and insol. salts (as Cr) | 7440-47-3 | - | 1 | - |\n\nSource: \n", "cas_number": "7440-47-3", "file": "chromium-metal-and-insol-salts-as-cr.md", "generated": true, "harvested": "2026-08-05", "id": "chromium-metal-and-insol-salts-as-cr", "pel_mgm3": "1", "source_quote": "Chromium metal and insol. salts (as Cr) | 7440-47-3 | - | 1 | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Chromium metal and insol. salts (as Cr)", "title": "Chromium metal and insol. salts (as Cr) \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Chromium metal\n\n**CAS No.:** 7440473\n\n**PEL (mg/m\u00b3):** 0.5\n\n> 7440473 | | Chromium metal | -- | 0.5\n\nSource: \n", "cas_number": "7440473", "file": "chromium-metal.md", "generated": true, "harvested": "2026-08-05", "id": "chromium-metal", "pel_mgm3": "0.5", "source_quote": "7440473 | | Chromium metal | -- | 0.5", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Chromium metal", "title": "Chromium metal \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Chromyl chloride\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Chromyl chloride\n\n**CAS No.:** 14977-61-8\n\n> CAS No. 14977-61-8\n\n**NIOSH REL, as stated:** Ca TWA 0.001 mg Cr(VI)/m3 See Appendix A See Appendix C\n\n> NIOSH REL Ca TWA 0.001 mg Cr(VI)/m3 See Appendix A See Appendix C\n\nSource: \n", "cas_number": "14977-61-8", "file": "chromyl-chloride-2.md", "generated": true, "harvested": "2026-09-08", "id": "chromyl-chloride-2", "quote_cas_number": "CAS No. 14977-61-8", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Chromyl chloride", "rel_statement": "Ca TWA 0.001 mg Cr(VI)/m3 See Appendix A See Appendix C", "source_quote": "NIOSH REL Ca TWA 0.001 mg Cr(VI)/m3 See Appendix A See Appendix C", "sources": ["https://www.cdc.gov/niosh/npg/npgd0142.html"], "stale_after": "2027-09-08", "substance": "Chromyl chloride", "title": "Chromyl chloride \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Chromyl chloride\n\n**CAS No.:** 14977618\n\n**PEL (ppm):** 0.025\n\n**PEL (mg/m\u00b3):** 0.15\n\n> 14977618 | | Chromyl chloride | 0.025 | 0.15\n\nSource: \n", "cas_number": "14977618", "file": "chromyl-chloride.md", "generated": true, "harvested": "2026-08-05", "id": "chromyl-chloride", "pel_mgm3": "0.15", "pel_ppm": "0.025", "source_quote": "14977618 | | Chromyl chloride | 0.025 | 0.15", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Chromyl chloride", "title": "Chromyl chloride \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Clopidol\n\n**CAS No.:** 2971906\n\n> 2971906 | | Clopidol | --\n\nSource: \n", "cas_number": "2971906", "file": "clopidol-2.md", "generated": true, "harvested": "2026-08-05", "id": "clopidol-2", "source_quote": "2971906 | | Clopidol | --", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Clopidol", "title": "Clopidol \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Clopidol\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Clopidol\n\n**CAS No.:** 2971-90-6\n\n> CAS No. 2971-90-6\n\n**NIOSH REL, as stated:** TWA 10 mg/m3 (total) ST 20 mg/m3 (total) TWA 5 mg/m3 (resp)\n\n> NIOSH REL TWA 10 mg/m3 (total) ST 20 mg/m3 (total) TWA 5 mg/m3 (resp)\n\nSource: \n", "cas_number": "2971-90-6", "file": "clopidol-3.md", "generated": true, "harvested": "2026-09-08", "id": "clopidol-3", "quote_cas_number": "CAS No. 2971-90-6", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Clopidol", "rel_statement": "TWA 10 mg/m3 (total) ST 20 mg/m3 (total) TWA 5 mg/m3 (resp)", "source_quote": "NIOSH REL TWA 10 mg/m3 (total) ST 20 mg/m3 (total) TWA 5 mg/m3 (resp)", "sources": ["https://www.cdc.gov/niosh/npg/npgd0143.html"], "stale_after": "2027-09-08", "substance": "Clopidol", "title": "Clopidol \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Clopidol\n\n**CAS No.:** 2971-90-6\n\n> Clopidol | 2971-90-6 | - | - | - |\n\nSource: \n", "cas_number": "2971-90-6", "file": "clopidol.md", "generated": true, "harvested": "2026-08-05", "id": "clopidol", "source_quote": "Clopidol | 2971-90-6 | - | - | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Clopidol", "title": "Clopidol \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Coal tar pitch volatiles (benzene soluble fraction), anthracene, BaP, phenanthrene, acridine, chrysene, pyrene\n\n**CAS No.:** 65966-93-2\n\n**PEL (mg/m\u00b3):** 0.2\n\n> Coal tar pitch volatiles (benzene soluble fraction), anthracene, BaP, phenanthrene, acridine, chrysene, pyrene | 65966-93-2 | - | 0.2 | - |\n\nSource: \n", "cas_number": "65966-93-2", "file": "coal-tar-pitch-volatiles-benzene-soluble-fraction-anthracene-bap-phenanthrene-ac.md", "generated": true, "harvested": "2026-08-05", "id": "coal-tar-pitch-volatiles-benzene-soluble-fraction-anthracene-bap-phenanthrene-ac", "pel_mgm3": "0.2", "source_quote": "Coal tar pitch volatiles (benzene soluble fraction), anthracene, BaP, phenanthrene, acridine, chrysene, pyrene | 65966-93-2 | - | 0.2 | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Coal tar pitch volatiles (benzene soluble fraction), anthracene, BaP, phenanthrene, acridine, chrysene, pyrene", "title": "Coal tar pitch volatiles (benzene soluble fraction), anthracene, BaP, phenanthrene, acridine, chrysene, pyrene \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Coal tar pitch volatiles\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Coal tar pitch volatiles\n\n**CAS No.:** 65996-93-2\n\n> CAS No. 65996-93-2\n\n**NIOSH REL (mg/m\u00b3):** TWA 0.1\n\n> NIOSH REL Ca TWA 0.1 mg/m3 (cyclohexane-extractable fraction)\n\nSource: \n", "cas_number": "65996-93-2", "file": "coal-tar-pitch-volatiles.md", "generated": true, "harvested": "2026-09-08", "id": "coal-tar-pitch-volatiles", "quote_cas_number": "CAS No. 65996-93-2", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Coal tar pitch volatiles", "rel_mgm3": "TWA 0.1", "source_quote": "NIOSH REL Ca TWA 0.1 mg/m3 (cyclohexane-extractable fraction)", "sources": ["https://www.cdc.gov/niosh/npg/npgd0145.html"], "stale_after": "2027-09-08", "substance": "Coal tar pitch volatiles", "title": "Coal tar pitch volatiles \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Cobalt carbonyl (as Co)\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Cobalt carbonyl (as Co)\n\n**CAS No.:** 10210-68-1\n\n> CAS No. 10210-68-1\n\n**NIOSH REL (mg/m\u00b3):** TWA 0.1\n\n> NIOSH REL TWA 0.1 mg/m3\n\nSource: \n", "cas_number": "10210-68-1", "file": "cobalt-carbonyl-as-co.md", "generated": true, "harvested": "2026-09-08", "id": "cobalt-carbonyl-as-co", "quote_cas_number": "CAS No. 10210-68-1", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Cobalt carbonyl (as Co)", "rel_mgm3": "TWA 0.1", "source_quote": "NIOSH REL TWA 0.1 mg/m3", "sources": ["https://www.cdc.gov/niosh/npg/npgd0147.html"], "stale_after": "2027-09-08", "substance": "Cobalt carbonyl (as Co)", "title": "Cobalt carbonyl (as Co) \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Cobalt hydrocarbonyl (as Co)\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Cobalt hydrocarbonyl (as Co)\n\n**CAS No.:** 16842-03-8\n\n> CAS No. 16842-03-8\n\n**NIOSH REL (mg/m\u00b3):** TWA 0.1\n\n> NIOSH REL TWA 0.1 mg/m3\n\nSource: \n", "cas_number": "16842-03-8", "file": "cobalt-hydrocarbonyl-as-co-2.md", "generated": true, "harvested": "2026-09-08", "id": "cobalt-hydrocarbonyl-as-co-2", "quote_cas_number": "CAS No. 16842-03-8", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Cobalt hydrocarbonyl (as Co)", "rel_mgm3": "TWA 0.1", "source_quote": "NIOSH REL TWA 0.1 mg/m3", "sources": ["https://www.cdc.gov/niosh/npg/npgd0148.html"], "stale_after": "2027-09-08", "substance": "Cobalt hydrocarbonyl (as Co)", "title": "Cobalt hydrocarbonyl (as Co) \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Cobalt hydrocarbonyl, as Co\n\n**CAS No.:** 16842038\n\n**PEL (mg/m\u00b3):** 0.1\n\n> 16842038 | | Cobalt hydrocarbonyl, as Co | -- | 0.1\n\nSource: \n", "cas_number": "16842038", "file": "cobalt-hydrocarbonyl-as-co.md", "generated": true, "harvested": "2026-08-05", "id": "cobalt-hydrocarbonyl-as-co", "pel_mgm3": "0.1", "source_quote": "16842038 | | Cobalt hydrocarbonyl, as Co | -- | 0.1", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Cobalt hydrocarbonyl, as Co", "title": "Cobalt hydrocarbonyl, as Co \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Cobalt metal dust and fume (as Co)\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Cobalt metal dust and fume (as Co)\n\n**CAS No.:** 7440-48-4\n\n> CAS No. 7440-48-4\n\n**NIOSH REL (mg/m\u00b3):** TWA 0.05\n\n> NIOSH REL TWA 0.05 mg/m3\n\nSource: \n", "cas_number": "7440-48-4", "file": "cobalt-metal-dust-and-fume-as-co-2.md", "generated": true, "harvested": "2026-09-08", "id": "cobalt-metal-dust-and-fume-as-co-2", "quote_cas_number": "CAS No. 7440-48-4", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Cobalt metal dust and fume (as Co)", "rel_mgm3": "TWA 0.05", "source_quote": "NIOSH REL TWA 0.05 mg/m3", "sources": ["https://www.cdc.gov/niosh/npg/npgd0146.html"], "stale_after": "2027-09-08", "substance": "Cobalt metal dust and fume (as Co)", "title": "Cobalt metal dust and fume (as Co) \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Cobalt metal, dust, and fume (as Co)\n\n**CAS No.:** 7440-48-4\n\n**PEL (mg/m\u00b3):** 0.1\n\n> Cobalt metal, dust, and fume (as Co) | 7440-48-4 | - | 0.1 | - |\n\nSource: \n", "cas_number": "7440-48-4", "file": "cobalt-metal-dust-and-fume-as-co.md", "generated": true, "harvested": "2026-08-05", "id": "cobalt-metal-dust-and-fume-as-co", "pel_mgm3": "0.1", "source_quote": "Cobalt metal, dust, and fume (as Co) | 7440-48-4 | - | 0.1 | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Cobalt metal, dust, and fume (as Co)", "title": "Cobalt metal, dust, and fume (as Co) \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Cobalt, metal fume and dust, as Co\n\n**CAS No.:** 7440484\n\n**PEL (mg/m\u00b3):** 0.02\n\n> 7440484 | | Cobalt, metal fume and dust, as Co | -- | 0.02\n\nSource: \n", "cas_number": "7440484", "file": "cobalt-metal-fume-and-dust-as-co.md", "generated": true, "harvested": "2026-08-05", "id": "cobalt-metal-fume-and-dust-as-co", "pel_mgm3": "0.02", "source_quote": "7440484 | | Cobalt, metal fume and dust, as Co | -- | 0.02", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Cobalt, metal fume and dust, as Co", "title": "Cobalt, metal fume and dust, as Co \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Copper (dusts and mists, as Cu)\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Copper (dusts and mists, as Cu)\n\n**CAS No.:** 7440-50-8\n\n> CAS No. 7440-50-8\n\n**NIOSH REL (mg/m\u00b3):** TWA 1\n\n> NIOSH REL TWA 1 mg/m3\n\nSource: \n", "cas_number": "7440-50-8", "file": "copper-dusts-and-mists-as-cu.md", "generated": true, "harvested": "2026-09-08", "id": "copper-dusts-and-mists-as-cu", "quote_cas_number": "CAS No. 7440-50-8", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Copper (dusts and mists, as Cu)", "rel_mgm3": "TWA 1", "source_quote": "NIOSH REL TWA 1 mg/m3", "sources": ["https://www.cdc.gov/niosh/npg/npgd0150.html"], "stale_after": "2027-09-08", "substance": "Copper (dusts and mists, as Cu)", "title": "Copper (dusts and mists, as Cu) \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Copper fume (as Cu)\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Copper fume (as Cu)\n\n**CAS No.:** 1317-38-0 (CuO)\n\n> CAS No. 1317-38-0 (CuO)\n\n**NIOSH REL (mg/m\u00b3):** TWA 0.1\n\n> NIOSH REL TWA 0.1 mg/m3\n\nSource: \n", "cas_number": "1317-38-0 (CuO)", "file": "copper-fume-as-cu.md", "generated": true, "harvested": "2026-09-08", "id": "copper-fume-as-cu", "quote_cas_number": "CAS No. 1317-38-0 (CuO)", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Copper fume (as Cu)", "rel_mgm3": "TWA 0.1", "source_quote": "NIOSH REL TWA 0.1 mg/m3", "sources": ["https://www.cdc.gov/niosh/npg/npgd0151.html"], "stale_after": "2027-09-08", "substance": "Copper fume (as Cu)", "title": "Copper fume (as Cu) \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Copper metal fume, as Cu\n\n**CAS No.:** 7440508\n\n**PEL (mg/m\u00b3):** 0.1\n\n> 7440508 | | Copper metal fume, as Cu | -- | 0.1\n\nSource: \n", "cas_number": "7440508", "file": "copper-metal-fume-as-cu.md", "generated": true, "harvested": "2026-08-05", "id": "copper-metal-fume-as-cu", "pel_mgm3": "0.1", "source_quote": "7440508 | | Copper metal fume, as Cu | -- | 0.1", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Copper metal fume, as Cu", "title": "Copper metal fume, as Cu \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Copper\n\n**CAS No.:** 7440-50-8\n\n> Copper | 7440-50-8 | - | - | - |\n\nSource: \n", "cas_number": "7440-50-8", "file": "copper.md", "generated": true, "harvested": "2026-08-05", "id": "copper", "source_quote": "Copper | 7440-50-8 | - | - | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Copper", "title": "Copper \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Crag herbicide (Sesone)\n\n**CAS No.:** 136-78-7\n\n> Crag herbicide (Sesone) | 136-78-7 | - | - | - |\n\nSource: \n", "cas_number": "136-78-7", "file": "crag-herbicide-sesone.md", "generated": true, "harvested": "2026-08-05", "id": "crag-herbicide-sesone", "source_quote": "Crag herbicide (Sesone) | 136-78-7 | - | - | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Crag herbicide (Sesone)", "title": "Crag herbicide (Sesone) \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Crag\u00ae herbicide\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Crag\u00ae herbicide\n\n**CAS No.:** 136-78-7\n\n> CAS No. 136-78-7\n\n**NIOSH REL, as stated:** TWA 10 mg/m3 (total) TWA 5 mg/m3 (resp)\n\n> NIOSH REL TWA 10 mg/m3 (total) TWA 5 mg/m3 (resp)\n\nSource: \n", "cas_number": "136-78-7", "file": "crag-herbicide.md", "generated": true, "harvested": "2026-09-08", "id": "crag-herbicide", "quote_cas_number": "CAS No. 136-78-7", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Crag\u00ae herbicide", "rel_statement": "TWA 10 mg/m3 (total) TWA 5 mg/m3 (resp)", "source_quote": "NIOSH REL TWA 10 mg/m3 (total) TWA 5 mg/m3 (resp)", "sources": ["https://www.cdc.gov/niosh/npg/npgd0153.html"], "stale_after": "2027-09-08", "substance": "Crag\u00ae herbicide", "title": "Crag\u00ae herbicide \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Cresol (all isomers)\n\n**CAS No.:** 1319773\n\n**PEL (ppm):** 5\n\n**PEL (mg/m\u00b3):** 22\n\n> 1319773 | S | Cresol (all isomers) | 5 | 22\n\nSource: \n", "cas_number": "1319773", "file": "cresol-all-isomers-2.md", "generated": true, "harvested": "2026-08-05", "id": "cresol-all-isomers-2", "pel_mgm3": "22", "pel_ppm": "5", "source_quote": "1319773 | S | Cresol (all isomers) | 5 | 22", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Cresol (all isomers)", "title": "Cresol (all isomers) \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Cresol, all isomers\n\n**CAS No.:** 1319-77-3\n\n**PEL (ppm):** 5\n\n**PEL (mg/m\u00b3):** 22\n\n> Cresol, all isomers | 1319-77-3 | 5 | 22 | X |\n\nSource: \n", "cas_number": "1319-77-3", "file": "cresol-all-isomers.md", "generated": true, "harvested": "2026-08-05", "id": "cresol-all-isomers", "pel_mgm3": "22", "pel_ppm": "5", "source_quote": "Cresol, all isomers | 1319-77-3 | 5 | 22 | X |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Cresol, all isomers", "title": "Cresol, all isomers \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Cristobalite; see 1910.1053 7\n\n**CAS No.:** 14464-46-1\n\n> Cristobalite; see 1910.1053 7 | 14464-46-1 | - | - | - |\n\nSource: \n", "cas_number": "14464-46-1", "file": "cristobalite-see-1910-1053-7.md", "generated": true, "harvested": "2026-08-05", "id": "cristobalite-see-1910-1053-7", "source_quote": "Cristobalite; see 1910.1053 7 | 14464-46-1 | - | - | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Cristobalite; see 1910.1053 7", "title": "Cristobalite; see 1910.1053 7 \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Cristobalite,\n\n**CAS No.:** 14464461\n\n**PEL (mg/m\u00b3):** 0.05\n\n> 14464461 | | Cristobalite, | -- | 0.05\n\nSource: \n", "cas_number": "14464461", "file": "cristobalite.md", "generated": true, "harvested": "2026-08-05", "id": "cristobalite", "pel_mgm3": "0.05", "source_quote": "14464461 | | Cristobalite, | -- | 0.05", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Cristobalite,", "title": "Cristobalite, \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Crotonaldehyde; beta-methylacrolein\n\n**CAS No.:** 123739\n\n**Ceiling:** 0.3\n\n> 123739 | S | Crotonaldehyde; beta-methylacrolein | | | 0.3\n\nSource: \n", "cas_number": "123739", "ceiling": "0.3", "file": "crotonaldehyde-beta-methylacrolein.md", "generated": true, "harvested": "2026-08-05", "id": "crotonaldehyde-beta-methylacrolein", "source_quote": "123739 | S | Crotonaldehyde; beta-methylacrolein | | | 0.3", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Crotonaldehyde; beta-methylacrolein", "title": "Crotonaldehyde; beta-methylacrolein \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Crotonaldehyde\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Crotonaldehyde\n\n**CAS No.:** 4170-30-3\n\n> CAS No. 4170-30-3\n\n**NIOSH REL (ppm):** TWA 2\n\n**NIOSH REL (mg/m\u00b3):** 6\n\n> NIOSH REL TWA 2 ppm (6 mg/m3)\n\nSource: \n", "cas_number": "4170-30-3", "file": "crotonaldehyde.md", "generated": true, "harvested": "2026-09-08", "id": "crotonaldehyde", "quote_cas_number": "CAS No. 4170-30-3", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Crotonaldehyde", "rel_mgm3": "6", "rel_ppm": "TWA 2", "source_quote": "NIOSH REL TWA 2 ppm (6 mg/m3)", "sources": ["https://www.cdc.gov/niosh/npg/npgd0157.html"], "stale_after": "2027-09-08", "substance": "Crotonaldehyde", "title": "Crotonaldehyde \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Crufomate\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Crufomate\n\n**CAS No.:** 299-86-5\n\n> CAS No. 299-86-5\n\n**NIOSH REL (mg/m\u00b3):** TWA 5\n\n> NIOSH REL TWA 5 mg/m3 ST 20 mg/m3\n\nSource: \n", "cas_number": "299-86-5", "file": "crufomate-2.md", "generated": true, "harvested": "2026-09-08", "id": "crufomate-2", "quote_cas_number": "CAS No. 299-86-5", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Crufomate", "rel_mgm3": "TWA 5", "source_quote": "NIOSH REL TWA 5 mg/m3 ST 20 mg/m3", "sources": ["https://www.cdc.gov/niosh/npg/npgd0158.html"], "stale_after": "2027-09-08", "substance": "Crufomate", "title": "Crufomate \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Crufomate\n\n**CAS No.:** 299865\n\n**PEL (mg/m\u00b3):** 5\n\n> 299865 | | Crufomate | -- | 5\n\nSource: \n", "cas_number": "299865", "file": "crufomate.md", "generated": true, "harvested": "2026-08-05", "id": "crufomate", "pel_mgm3": "5", "source_quote": "299865 | | Crufomate | -- | 5", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Crufomate", "title": "Crufomate \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Cumene\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Cumene\n\n**CAS No.:** 98-82-8\n\n> CAS No. 98-82-8\n\n**NIOSH REL (ppm):** TWA 50\n\n**NIOSH REL (mg/m\u00b3):** 245\n\n> NIOSH REL TWA 50 ppm (245 mg/m3) [skin]\n\nSource: \n", "cas_number": "98-82-8", "file": "cumene-2.md", "generated": true, "harvested": "2026-09-08", "id": "cumene-2", "quote_cas_number": "CAS No. 98-82-8", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Cumene", "rel_mgm3": "245", "rel_ppm": "TWA 50", "source_quote": "NIOSH REL TWA 50 ppm (245 mg/m3) [skin]", "sources": ["https://www.cdc.gov/niosh/npg/npgd0159.html"], "stale_after": "2027-09-08", "substance": "Cumene", "title": "Cumene \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Cumene; isopropylbenzene\n\n**CAS No.:** 98828\n\n**PEL (ppm):** 50\n\n**PEL (mg/m\u00b3):** 245\n\n> 98828 | S | Cumene; isopropylbenzene | 50 | 245\n\nSource: \n", "cas_number": "98828", "file": "cumene-isopropylbenzene.md", "generated": true, "harvested": "2026-08-05", "id": "cumene-isopropylbenzene", "pel_mgm3": "245", "pel_ppm": "50", "source_quote": "98828 | S | Cumene; isopropylbenzene | 50 | 245", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Cumene; isopropylbenzene", "title": "Cumene; isopropylbenzene \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Cumene\n\n**CAS No.:** 98-82-8\n\n**PEL (ppm):** 50\n\n**PEL (mg/m\u00b3):** 245\n\n> Cumene | 98-82-8 | 50 | 245 | X |\n\nSource: \n", "cas_number": "98-82-8", "file": "cumene.md", "generated": true, "harvested": "2026-08-05", "id": "cumene", "pel_mgm3": "245", "pel_ppm": "50", "source_quote": "Cumene | 98-82-8 | 50 | 245 | X |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Cumene", "title": "Cumene \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Cyanamide\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Cyanamide\n\n**CAS No.:** 420-04-2\n\n> CAS No. 420-04-2\n\n**NIOSH REL (mg/m\u00b3):** TWA 2\n\n> NIOSH REL TWA 2 mg/m3\n\nSource: \n", "cas_number": "420-04-2", "file": "cyanamide-2.md", "generated": true, "harvested": "2026-09-08", "id": "cyanamide-2", "quote_cas_number": "CAS No. 420-04-2", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Cyanamide", "rel_mgm3": "TWA 2", "source_quote": "NIOSH REL TWA 2 mg/m3", "sources": ["https://www.cdc.gov/niosh/npg/npgd0160.html"], "stale_after": "2027-09-08", "substance": "Cyanamide", "title": "Cyanamide \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Cyanamide\n\n**CAS No.:** 420042\n\n**PEL (mg/m\u00b3):** 2\n\n> 420042 | | Cyanamide | -- | 2\n\nSource: \n", "cas_number": "420042", "file": "cyanamide.md", "generated": true, "harvested": "2026-08-05", "id": "cyanamide", "pel_mgm3": "2", "source_quote": "420042 | | Cyanamide | -- | 2", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Cyanamide", "title": "Cyanamide \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Cyanogen\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Cyanogen\n\n**CAS No.:** 460-19-5\n\n> CAS No. 460-19-5\n\n**NIOSH REL (ppm):** TWA 10\n\n**NIOSH REL (mg/m\u00b3):** 20\n\n> NIOSH REL TWA 10 ppm (20 mg/m3)\n\nSource: \n", "cas_number": "460-19-5", "file": "cyanogen-2.md", "generated": true, "harvested": "2026-09-08", "id": "cyanogen-2", "quote_cas_number": "CAS No. 460-19-5", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Cyanogen", "rel_mgm3": "20", "rel_ppm": "TWA 10", "source_quote": "NIOSH REL TWA 10 ppm (20 mg/m3)", "sources": ["https://www.cdc.gov/niosh/npg/npgd0161.html"], "stale_after": "2027-09-08", "substance": "Cyanogen", "title": "Cyanogen \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Cyanogen chloride\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Cyanogen chloride\n\n**CAS No.:** 506-77-4\n\n> CAS No. 506-77-4\n\n**NIOSH REL (ppm):** C 0.3\n\n**NIOSH REL (mg/m\u00b3):** 0.6\n\n> NIOSH REL C 0.3 ppm (0.6 mg/m3)\n\nSource: \n", "cas_number": "506-77-4", "file": "cyanogen-chloride-2.md", "generated": true, "harvested": "2026-09-08", "id": "cyanogen-chloride-2", "quote_cas_number": "CAS No. 506-77-4", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Cyanogen chloride", "rel_mgm3": "0.6", "rel_ppm": "C 0.3", "source_quote": "NIOSH REL C 0.3 ppm (0.6 mg/m3)", "sources": ["https://www.cdc.gov/niosh/npg/npgd0162.html"], "stale_after": "2027-09-08", "substance": "Cyanogen chloride", "title": "Cyanogen chloride \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Cyanogen chloride\n\n**CAS No.:** 506774\n\n**PEL (ppm):** 0.3\n\n**PEL (mg/m\u00b3):** 0.6\n\n**Ceiling:** C\n\n> 506774 | | Cyanogen chloride | 0.3 | 0.6 | C\n\nSource: \n", "cas_number": "506774", "ceiling": "C", "file": "cyanogen-chloride.md", "generated": true, "harvested": "2026-08-05", "id": "cyanogen-chloride", "pel_mgm3": "0.6", "pel_ppm": "0.3", "source_quote": "506774 | | Cyanogen chloride | 0.3 | 0.6 | C", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Cyanogen chloride", "title": "Cyanogen chloride \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Cyanogen\n\n**CAS No.:** 460195\n\n**PEL (ppm):** 10\n\n**PEL (mg/m\u00b3):** 20\n\n> 460195 | | Cyanogen | 10 | 20\n\nSource: \n", "cas_number": "460195", "file": "cyanogen.md", "generated": true, "harvested": "2026-08-05", "id": "cyanogen", "pel_mgm3": "20", "pel_ppm": "10", "source_quote": "460195 | | Cyanogen | 10 | 20", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Cyanogen", "title": "Cyanogen \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Cyclohexane\n\n**CAS No.:** 110827\n\n**PEL (ppm):** 300\n\n**PEL (mg/m\u00b3):** 1,050\n\n> 110827 | | Cyclohexane | 300 | 1,050\n\nSource: \n", "cas_number": "110827", "file": "cyclohexane-2.md", "generated": true, "harvested": "2026-08-05", "id": "cyclohexane-2", "pel_mgm3": "1,050", "pel_ppm": "300", "source_quote": "110827 | | Cyclohexane | 300 | 1,050", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Cyclohexane", "title": "Cyclohexane \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Cyclohexane\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Cyclohexane\n\n**CAS No.:** 110-82-7\n\n> CAS No. 110-82-7\n\n**NIOSH REL (ppm):** TWA 300\n\n**NIOSH REL (mg/m\u00b3):** 1050\n\n> NIOSH REL TWA 300 ppm (1050 mg/m3)\n\nSource: \n", "cas_number": "110-82-7", "file": "cyclohexane-3.md", "generated": true, "harvested": "2026-09-08", "id": "cyclohexane-3", "quote_cas_number": "CAS No. 110-82-7", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Cyclohexane", "rel_mgm3": "1050", "rel_ppm": "TWA 300", "source_quote": "NIOSH REL TWA 300 ppm (1050 mg/m3)", "sources": ["https://www.cdc.gov/niosh/npg/npgd0163.html"], "stale_after": "2027-09-08", "substance": "Cyclohexane", "title": "Cyclohexane \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Cyclohexane\n\n**CAS No.:** 110-82-7\n\n**PEL (ppm):** 300\n\n**PEL (mg/m\u00b3):** 1050\n\n> Cyclohexane | 110-82-7 | 300 | 1050 | - |\n\nSource: \n", "cas_number": "110-82-7", "file": "cyclohexane.md", "generated": true, "harvested": "2026-08-05", "id": "cyclohexane", "pel_mgm3": "1050", "pel_ppm": "300", "source_quote": "Cyclohexane | 110-82-7 | 300 | 1050 | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Cyclohexane", "title": "Cyclohexane \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Cyclohexanethiol\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Cyclohexanethiol\n\n**CAS No.:** 1569-69-3\n\n> CAS No. 1569-69-3\n\n**NIOSH REL (ppm):** C 0.5\n\n**NIOSH REL (mg/m\u00b3):** 2.4\n\n> NIOSH REL C 0.5 ppm (2.4 mg/m3) [15-minute]\n\nSource: \n", "cas_number": "1569-69-3", "file": "cyclohexanethiol.md", "generated": true, "harvested": "2026-09-08", "id": "cyclohexanethiol", "quote_cas_number": "CAS No. 1569-69-3", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Cyclohexanethiol", "rel_mgm3": "2.4", "rel_ppm": "C 0.5", "source_quote": "NIOSH REL C 0.5 ppm (2.4 mg/m3) [15-minute]", "sources": ["https://www.cdc.gov/niosh/npg/npgd0164.html"], "stale_after": "2027-09-08", "substance": "Cyclohexanethiol", "title": "Cyclohexanethiol \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Cyclohexanol\n\n**CAS No.:** 108930\n\n**PEL (ppm):** 50\n\n**PEL (mg/m\u00b3):** 200\n\n> 108930 | S | Cyclohexanol | 50 | 200\n\nSource: \n", "cas_number": "108930", "file": "cyclohexanol-2.md", "generated": true, "harvested": "2026-08-05", "id": "cyclohexanol-2", "pel_mgm3": "200", "pel_ppm": "50", "source_quote": "108930 | S | Cyclohexanol | 50 | 200", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Cyclohexanol", "title": "Cyclohexanol \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Cyclohexanol\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Cyclohexanol\n\n**CAS No.:** 108-93-0\n\n> CAS No. 108-93-0\n\n**NIOSH REL (ppm):** TWA 50\n\n**NIOSH REL (mg/m\u00b3):** 200\n\n> NIOSH REL TWA 50 ppm (200 mg/m3) [skin]\n\nSource: \n", "cas_number": "108-93-0", "file": "cyclohexanol-3.md", "generated": true, "harvested": "2026-09-08", "id": "cyclohexanol-3", "quote_cas_number": "CAS No. 108-93-0", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Cyclohexanol", "rel_mgm3": "200", "rel_ppm": "TWA 50", "source_quote": "NIOSH REL TWA 50 ppm (200 mg/m3) [skin]", "sources": ["https://www.cdc.gov/niosh/npg/npgd0165.html"], "stale_after": "2027-09-08", "substance": "Cyclohexanol", "title": "Cyclohexanol \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Cyclohexanol\n\n**CAS No.:** 108-93-0\n\n**PEL (ppm):** 50\n\n**PEL (mg/m\u00b3):** 200\n\n> Cyclohexanol | 108-93-0 | 50 | 200 | - |\n\nSource: \n", "cas_number": "108-93-0", "file": "cyclohexanol.md", "generated": true, "harvested": "2026-08-05", "id": "cyclohexanol", "pel_mgm3": "200", "pel_ppm": "50", "source_quote": "Cyclohexanol | 108-93-0 | 50 | 200 | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Cyclohexanol", "title": "Cyclohexanol \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Cyclohexanone\n\n**CAS No.:** 108941\n\n**PEL (ppm):** 25\n\n**PEL (mg/m\u00b3):** 100\n\n> 108941 | S | Cyclohexanone | 25 | 100\n\nSource: \n", "cas_number": "108941", "file": "cyclohexanone-2.md", "generated": true, "harvested": "2026-08-05", "id": "cyclohexanone-2", "pel_mgm3": "100", "pel_ppm": "25", "source_quote": "108941 | S | Cyclohexanone | 25 | 100", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Cyclohexanone", "title": "Cyclohexanone \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Cyclohexanone\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Cyclohexanone\n\n**CAS No.:** 108-94-1\n\n> CAS No. 108-94-1\n\n**NIOSH REL (ppm):** TWA 25\n\n**NIOSH REL (mg/m\u00b3):** 100\n\n> NIOSH REL TWA 25 ppm (100 mg/m3) [skin]\n\nSource: \n", "cas_number": "108-94-1", "file": "cyclohexanone-3.md", "generated": true, "harvested": "2026-09-08", "id": "cyclohexanone-3", "quote_cas_number": "CAS No. 108-94-1", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Cyclohexanone", "rel_mgm3": "100", "rel_ppm": "TWA 25", "source_quote": "NIOSH REL TWA 25 ppm (100 mg/m3) [skin]", "sources": ["https://www.cdc.gov/niosh/npg/npgd0166.html"], "stale_after": "2027-09-08", "substance": "Cyclohexanone", "title": "Cyclohexanone \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Cyclohexanone\n\n**CAS No.:** 108-94-1\n\n**PEL (ppm):** 50\n\n**PEL (mg/m\u00b3):** 200\n\n> Cyclohexanone | 108-94-1 | 50 | 200 | - |\n\nSource: \n", "cas_number": "108-94-1", "file": "cyclohexanone.md", "generated": true, "harvested": "2026-08-05", "id": "cyclohexanone", "pel_mgm3": "200", "pel_ppm": "50", "source_quote": "Cyclohexanone | 108-94-1 | 50 | 200 | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Cyclohexanone", "title": "Cyclohexanone \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Cyclohexene\n\n**CAS No.:** 110838\n\n**PEL (ppm):** 300\n\n**PEL (mg/m\u00b3):** 1,015\n\n> 110838 | | Cyclohexene | 300 | 1,015\n\nSource: \n", "cas_number": "110838", "file": "cyclohexene-2.md", "generated": true, "harvested": "2026-08-05", "id": "cyclohexene-2", "pel_mgm3": "1,015", "pel_ppm": "300", "source_quote": "110838 | | Cyclohexene | 300 | 1,015", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Cyclohexene", "title": "Cyclohexene \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Cyclohexene\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Cyclohexene\n\n**CAS No.:** 110-83-8\n\n> CAS No. 110-83-8\n\n**NIOSH REL (ppm):** TWA 300\n\n**NIOSH REL (mg/m\u00b3):** 1015\n\n> NIOSH REL TWA 300 ppm (1015 mg/m3)\n\nSource: \n", "cas_number": "110-83-8", "file": "cyclohexene-3.md", "generated": true, "harvested": "2026-09-08", "id": "cyclohexene-3", "quote_cas_number": "CAS No. 110-83-8", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Cyclohexene", "rel_mgm3": "1015", "rel_ppm": "TWA 300", "source_quote": "NIOSH REL TWA 300 ppm (1015 mg/m3)", "sources": ["https://www.cdc.gov/niosh/npg/npgd0167.html"], "stale_after": "2027-09-08", "substance": "Cyclohexene", "title": "Cyclohexene \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Cyclohexene\n\n**CAS No.:** 110-83-8\n\n**PEL (ppm):** 300\n\n**PEL (mg/m\u00b3):** 1015\n\n> Cyclohexene | 110-83-8 | 300 | 1015 | - |\n\nSource: \n", "cas_number": "110-83-8", "file": "cyclohexene.md", "generated": true, "harvested": "2026-08-05", "id": "cyclohexene", "pel_mgm3": "1015", "pel_ppm": "300", "source_quote": "Cyclohexene | 110-83-8 | 300 | 1015 | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Cyclohexene", "title": "Cyclohexene \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Cyclohexylamine\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Cyclohexylamine\n\n**CAS No.:** 108-91-8\n\n> CAS No. 108-91-8\n\n**NIOSH REL (ppm):** TWA 10\n\n**NIOSH REL (mg/m\u00b3):** 40\n\n> NIOSH REL TWA 10 ppm (40 mg/m3)\n\nSource: \n", "cas_number": "108-91-8", "file": "cyclohexylamine-2.md", "generated": true, "harvested": "2026-09-08", "id": "cyclohexylamine-2", "quote_cas_number": "CAS No. 108-91-8", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Cyclohexylamine", "rel_mgm3": "40", "rel_ppm": "TWA 10", "source_quote": "NIOSH REL TWA 10 ppm (40 mg/m3)", "sources": ["https://www.cdc.gov/niosh/npg/npgd0168.html"], "stale_after": "2027-09-08", "substance": "Cyclohexylamine", "title": "Cyclohexylamine \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Cyclohexylamine\n\n**CAS No.:** 108918\n\n**PEL (ppm):** 10\n\n**PEL (mg/m\u00b3):** 40\n\n> 108918 | S | Cyclohexylamine | 10 | 40\n\nSource: \n", "cas_number": "108918", "file": "cyclohexylamine.md", "generated": true, "harvested": "2026-08-05", "id": "cyclohexylamine", "pel_mgm3": "40", "pel_ppm": "10", "source_quote": "108918 | S | Cyclohexylamine | 10 | 40", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Cyclohexylamine", "title": "Cyclohexylamine \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Cyclonite; RDX; cyclotrimethylenetrinitramine\n\n**CAS No.:** 121824\n\n**PEL (mg/m\u00b3):** 0.07\n\n> 121824 | S | Cyclonite; RDX; cyclotrimethylenetrinitramine | -- | 0.07\n\nSource: \n", "cas_number": "121824", "file": "cyclonite-rdx-cyclotrimethylenetrinitramine.md", "generated": true, "harvested": "2026-08-05", "id": "cyclonite-rdx-cyclotrimethylenetrinitramine", "pel_mgm3": "0.07", "source_quote": "121824 | S | Cyclonite; RDX; cyclotrimethylenetrinitramine | -- | 0.07", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Cyclonite; RDX; cyclotrimethylenetrinitramine", "title": "Cyclonite; RDX; cyclotrimethylenetrinitramine \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Cyclonite\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Cyclonite\n\n**CAS No.:** 121-82-4\n\n> CAS No. 121-82-4\n\n**NIOSH REL (mg/m\u00b3):** TWA 1.5\n\n> NIOSH REL TWA 1.5 mg/m3 ST 3 mg/m3 [skin]\n\nSource: \n", "cas_number": "121-82-4", "file": "cyclonite.md", "generated": true, "harvested": "2026-09-08", "id": "cyclonite", "quote_cas_number": "CAS No. 121-82-4", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Cyclonite", "rel_mgm3": "TWA 1.5", "source_quote": "NIOSH REL TWA 1.5 mg/m3 ST 3 mg/m3 [skin]", "sources": ["https://www.cdc.gov/niosh/npg/npgd0169.html"], "stale_after": "2027-09-08", "substance": "Cyclonite", "title": "Cyclonite \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Cyclopentadiene\n\n**CAS No.:** 542927\n\n**PEL (ppm):** 75\n\n**PEL (mg/m\u00b3):** 200\n\n> 542927 | | Cyclopentadiene | 75 | 200\n\nSource: \n", "cas_number": "542927", "file": "cyclopentadiene-2.md", "generated": true, "harvested": "2026-08-05", "id": "cyclopentadiene-2", "pel_mgm3": "200", "pel_ppm": "75", "source_quote": "542927 | | Cyclopentadiene | 75 | 200", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Cyclopentadiene", "title": "Cyclopentadiene \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Cyclopentadiene\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Cyclopentadiene\n\n**CAS No.:** 542-92-7\n\n> CAS No. 542-92-7\n\n**NIOSH REL (ppm):** TWA 75\n\n**NIOSH REL (mg/m\u00b3):** 200\n\n> NIOSH REL TWA 75 ppm (200 mg/m3)\n\nSource: \n", "cas_number": "542-92-7", "file": "cyclopentadiene-3.md", "generated": true, "harvested": "2026-09-08", "id": "cyclopentadiene-3", "quote_cas_number": "CAS No. 542-92-7", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Cyclopentadiene", "rel_mgm3": "200", "rel_ppm": "TWA 75", "source_quote": "NIOSH REL TWA 75 ppm (200 mg/m3)", "sources": ["https://www.cdc.gov/niosh/npg/npgd0170.html"], "stale_after": "2027-09-08", "substance": "Cyclopentadiene", "title": "Cyclopentadiene \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Cyclopentadiene\n\n**CAS No.:** 542-92-7\n\n**PEL (ppm):** 75\n\n**PEL (mg/m\u00b3):** 200\n\n> Cyclopentadiene | 542-92-7 | 75 | 200 | - |\n\nSource: \n", "cas_number": "542-92-7", "file": "cyclopentadiene.md", "generated": true, "harvested": "2026-08-05", "id": "cyclopentadiene", "pel_mgm3": "200", "pel_ppm": "75", "source_quote": "Cyclopentadiene | 542-92-7 | 75 | 200 | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Cyclopentadiene", "title": "Cyclopentadiene \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Cyclopentane\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Cyclopentane\n\n**CAS No.:** 287-92-3\n\n> CAS No. 287-92-3\n\n**NIOSH REL (ppm):** TWA 600\n\n**NIOSH REL (mg/m\u00b3):** 1720\n\n> NIOSH REL TWA 600 ppm (1720 mg/m3)\n\nSource: \n", "cas_number": "287-92-3", "file": "cyclopentane-2.md", "generated": true, "harvested": "2026-09-08", "id": "cyclopentane-2", "quote_cas_number": "CAS No. 287-92-3", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Cyclopentane", "rel_mgm3": "1720", "rel_ppm": "TWA 600", "source_quote": "NIOSH REL TWA 600 ppm (1720 mg/m3)", "sources": ["https://www.cdc.gov/niosh/npg/npgd0171.html"], "stale_after": "2027-09-08", "substance": "Cyclopentane", "title": "Cyclopentane \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Cyclopentane\n\n**CAS No.:** 287923\n\n**PEL (ppm):** 600\n\n**PEL (mg/m\u00b3):** 1,720\n\n> 287923 | | Cyclopentane | 600 | 1,720\n\nSource: \n", "cas_number": "287923", "file": "cyclopentane.md", "generated": true, "harvested": "2026-08-05", "id": "cyclopentane", "pel_mgm3": "1,720", "pel_ppm": "600", "source_quote": "287923 | | Cyclopentane | 600 | 1,720", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Cyclopentane", "title": "Cyclopentane \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Cyhexatin; tricyclohexyltin hydroxide\n\n**CAS No.:** 13121705\n\n**PEL (mg/m\u00b3):** 5\n\n> 13121705 | | Cyhexatin; tricyclohexyltin hydroxide | | 5\n\nSource: \n", "cas_number": "13121705", "file": "cyhexatin-tricyclohexyltin-hydroxide.md", "generated": true, "harvested": "2026-08-05", "id": "cyhexatin-tricyclohexyltin-hydroxide", "pel_mgm3": "5", "source_quote": "13121705 | | Cyhexatin; tricyclohexyltin hydroxide | | 5", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Cyhexatin; tricyclohexyltin hydroxide", "title": "Cyhexatin; tricyclohexyltin hydroxide \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Cyhexatin\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Cyhexatin\n\n**CAS No.:** 13121-70-5\n\n> CAS No. 13121-70-5\n\n**NIOSH REL (mg/m\u00b3):** TWA 5\n\n> NIOSH REL TWA 5 mg/m3\n\nSource: \n", "cas_number": "13121-70-5", "file": "cyhexatin.md", "generated": true, "harvested": "2026-09-08", "id": "cyhexatin", "quote_cas_number": "CAS No. 13121-70-5", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Cyhexatin", "rel_mgm3": "TWA 5", "source_quote": "NIOSH REL TWA 5 mg/m3", "sources": ["https://www.cdc.gov/niosh/npg/npgd0172.html"], "stale_after": "2027-09-08", "substance": "Cyhexatin", "title": "Cyhexatin \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** D-Benzoquinone; see Quinone\n\n**CAS No.:** 106514\n\n> 106514 | | D-Benzoquinone; see Quinone\n\nSource: \n", "cas_number": "106514", "file": "d-benzoquinone-see-quinone.md", "generated": true, "harvested": "2026-08-05", "id": "d-benzoquinone-see-quinone", "source_quote": "106514 | | D-Benzoquinone; see Quinone", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "D-Benzoquinone; see Quinone", "title": "D-Benzoquinone; see Quinone \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** DDT; 1,1,1-trichloro-2,2-bis-(p-chlorophenyl)ethane\n\n**CAS No.:** 50293\n\n**PEL (mg/m\u00b3):** 1\n\n> 50293 | S | DDT; 1,1,1-trichloro-2,2-bis-(p-chlorophenyl)ethane | -- | 1\n\nSource: \n", "cas_number": "50293", "file": "ddt-1-1-1-trichloro-2-2-bis-p-chlorophenyl-ethane.md", "generated": true, "harvested": "2026-08-05", "id": "ddt-1-1-1-trichloro-2-2-bis-p-chlorophenyl-ethane", "pel_mgm3": "1", "source_quote": "50293 | S | DDT; 1,1,1-trichloro-2,2-bis-(p-chlorophenyl)ethane | -- | 1", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "DDT; 1,1,1-trichloro-2,2-bis-(p-chlorophenyl)ethane", "title": "DDT; 1,1,1-trichloro-2,2-bis-(p-chlorophenyl)ethane \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** DDT\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - DDT\n\n**CAS No.:** 50-29-3\n\n> CAS No. 50-29-3\n\n**NIOSH REL (mg/m\u00b3):** TWA 0.5\n\n> NIOSH REL Ca TWA 0.5 mg/m3\n\nSource: \n", "cas_number": "50-29-3", "file": "ddt.md", "generated": true, "harvested": "2026-09-08", "id": "ddt", "quote_cas_number": "CAS No. 50-29-3", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - DDT", "rel_mgm3": "TWA 0.5", "source_quote": "NIOSH REL Ca TWA 0.5 mg/m3", "sources": ["https://www.cdc.gov/niosh/npg/npgd0174.html"], "stale_after": "2027-09-08", "substance": "DDT", "title": "DDT \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** DDVP, see Dichlorvos\n\n**CAS No.:** 62737\n\n> 62737 | | DDVP, see Dichlorvos\n\nSource: \n", "cas_number": "62737", "file": "ddvp-see-dichlorvos.md", "generated": true, "harvested": "2026-08-05", "id": "ddvp-see-dichlorvos", "source_quote": "62737 | | DDVP, see Dichlorvos", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "DDVP, see Dichlorvos", "title": "DDVP, see Dichlorvos \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Decaborane\n\n**CAS No.:** 17702419\n\n**PEL (ppm):** 0.05\n\n**PEL (mg/m\u00b3):** 0.3\n\n**STEL (ppm):** 0.15\n\n**STEL (mg/m\u00b3):** 0.9\n\n> 17702419 | S | Decaborane | 0.05 | 0.3 | | 0.15 | 0.9\n\nSource: \n", "cas_number": "17702419", "file": "decaborane-2.md", "generated": true, "harvested": "2026-08-05", "id": "decaborane-2", "pel_mgm3": "0.3", "pel_ppm": "0.05", "source_quote": "17702419 | S | Decaborane | 0.05 | 0.3 | | 0.15 | 0.9", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "stel_mgm3": "0.9", "stel_ppm": "0.15", "substance": "Decaborane", "title": "Decaborane \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Decaborane\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Decaborane\n\n**CAS No.:** 17702-41-9\n\n> CAS No. 17702-41-9\n\n**NIOSH REL (ppm):** 0.05\n\n**NIOSH REL (mg/m\u00b3):** TWA 0.3\n\n> NIOSH REL TWA 0.3 mg/m3 (0.05 ppm) ST 0.9 mg/m3 (0.15 ppm) [skin]\n\nSource: \n", "cas_number": "17702-41-9", "file": "decaborane-3.md", "generated": true, "harvested": "2026-09-08", "id": "decaborane-3", "quote_cas_number": "CAS No. 17702-41-9", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Decaborane", "rel_mgm3": "TWA 0.3", "rel_ppm": "0.05", "source_quote": "NIOSH REL TWA 0.3 mg/m3 (0.05 ppm) ST 0.9 mg/m3 (0.15 ppm) [skin]", "sources": ["https://www.cdc.gov/niosh/npg/npgd0175.html"], "stale_after": "2027-09-08", "substance": "Decaborane", "title": "Decaborane \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Decaborane\n\n**CAS No.:** 17702-41-9\n\n**PEL (ppm):** 0.05\n\n**PEL (mg/m\u00b3):** 0.3\n\n> Decaborane | 17702-41-9 | 0.05 | 0.3 | X |\n\nSource: \n", "cas_number": "17702-41-9", "file": "decaborane.md", "generated": true, "harvested": "2026-08-05", "id": "decaborane", "pel_mgm3": "0.3", "pel_ppm": "0.05", "source_quote": "Decaborane | 17702-41-9 | 0.05 | 0.3 | X |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Decaborane", "title": "Decaborane \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Demeton; a mixture of o,o-diethyl o-2(ethylthio)ethyl phosphorothloate and o,o'-diethyl S-2(ethylthio)ethyl phosphorothioate\n\n**CAS No.:** 8065483\n\n**PEL (ppm):** 0.01\n\n**PEL (mg/m\u00b3):** 0.1\n\n> 8065483 | S | Demeton; a mixture of o,o-diethyl o-2(ethylthio)ethyl phosphorothloate and o,o'-diethyl S-2(ethylthio)ethyl phosphorothioate | 0.01 | 0.1\n\nSource: \n", "cas_number": "8065483", "file": "demeton-a-mixture-of-o-o-diethyl-o-2-ethylthio-ethyl-phosphorothloate-and-o-o-di.md", "generated": true, "harvested": "2026-08-05", "id": "demeton-a-mixture-of-o-o-diethyl-o-2-ethylthio-ethyl-phosphorothloate-and-o-o-di", "pel_mgm3": "0.1", "pel_ppm": "0.01", "source_quote": "8065483 | S | Demeton; a mixture of o,o-diethyl o-2(ethylthio)ethyl phosphorothloate and o,o'-diethyl S-2(ethylthio)ethyl phosphorothioate | 0.01 | 0.1", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Demeton; a mixture of o,o-diethyl o-2(ethylthio)ethyl phosphorothloate and o,o'-diethyl S-2(ethylthio)ethyl phosphorothioate", "title": "Demeton; a mixture of o,o-diethyl o-2(ethylthio)ethyl phosphorothloate and o,o'-diethyl S-2(ethylthio)ethyl phosphorothioate \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Demeton (Systox)\n\n**CAS No.:** 8065-48-3\n\n**PEL (mg/m\u00b3):** 0.1\n\n> Demeton (Systox) | 8065-48-3 | - | 0.1 | X |\n\nSource: \n", "cas_number": "8065-48-3", "file": "demeton-systox.md", "generated": true, "harvested": "2026-08-05", "id": "demeton-systox", "pel_mgm3": "0.1", "source_quote": "Demeton (Systox) | 8065-48-3 | - | 0.1 | X |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Demeton (Systox)", "title": "Demeton (Systox) \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Demeton\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Demeton\n\n**CAS No.:** 8065-48-3\n\n> CAS No. 8065-48-3\n\n**NIOSH REL (mg/m\u00b3):** TWA 0.1\n\n> NIOSH REL TWA 0.1 mg/m3 [skin]\n\nSource: \n", "cas_number": "8065-48-3", "file": "demeton.md", "generated": true, "harvested": "2026-09-08", "id": "demeton", "quote_cas_number": "CAS No. 8065-48-3", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Demeton", "rel_mgm3": "TWA 0.1", "source_quote": "NIOSH REL TWA 0.1 mg/m3 [skin]", "sources": ["https://www.cdc.gov/niosh/npg/npgd0177.html"], "stale_after": "2027-09-08", "substance": "Demeton", "title": "Demeton \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Di-(2-ethylhexyl) phthalate; see Di-sec-octyl phthalate\n\n**CAS No.:** 117817\n\n> 117817 | | Di-(2-ethylhexyl) phthalate; see Di-sec-octyl phthalate\n\nSource: \n", "cas_number": "117817", "file": "di-2-ethylhexyl-phthalate-see-di-sec-octyl-phthalate.md", "generated": true, "harvested": "2026-08-05", "id": "di-2-ethylhexyl-phthalate-see-di-sec-octyl-phthalate", "source_quote": "117817 | | Di-(2-ethylhexyl) phthalate; see Di-sec-octyl phthalate", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Di-(2-ethylhexyl) phthalate; see Di-sec-octyl phthalate", "title": "Di-(2-ethylhexyl) phthalate; see Di-sec-octyl phthalate \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Di-sec-octyl phthalate; bis(2 ethylhexyl) phthalate\n\n**CAS No.:** 117817\n\n**PEL (mg/m\u00b3):** 5\n\n> 117817 | | Di-sec-octyl phthalate; bis(2 ethylhexyl) phthalate | -- | 5 | | --\n\nSource: \n", "cas_number": "117817", "file": "di-sec-octyl-phthalate-bis-2-ethylhexyl-phthalate.md", "generated": true, "harvested": "2026-08-05", "id": "di-sec-octyl-phthalate-bis-2-ethylhexyl-phthalate", "pel_mgm3": "5", "source_quote": "117817 | | Di-sec-octyl phthalate; bis(2 ethylhexyl) phthalate | -- | 5 | | --", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Di-sec-octyl phthalate; bis(2 ethylhexyl) phthalate", "title": "Di-sec-octyl phthalate; bis(2 ethylhexyl) phthalate \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Di-sec octyl phthalate (Di-(2-ethylhexyl) phthalate)\n\n**CAS No.:** 117-81-7\n\n**PEL (mg/m\u00b3):** 5\n\n> Di-sec octyl phthalate (Di-(2-ethylhexyl) phthalate) | 117-81-7 | - | 5 | - |\n\nSource: \n", "cas_number": "117-81-7", "file": "di-sec-octyl-phthalate-di-2-ethylhexyl-phthalate.md", "generated": true, "harvested": "2026-08-05", "id": "di-sec-octyl-phthalate-di-2-ethylhexyl-phthalate", "pel_mgm3": "5", "source_quote": "Di-sec octyl phthalate (Di-(2-ethylhexyl) phthalate) | 117-81-7 | - | 5 | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Di-sec octyl phthalate (Di-(2-ethylhexyl) phthalate)", "title": "Di-sec octyl phthalate (Di-(2-ethylhexyl) phthalate) \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Di-sec octyl phthalate\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Di-sec octyl phthalate\n\n**CAS No.:** 117-81-7\n\n> CAS No. 117-81-7\n\n**NIOSH REL (mg/m\u00b3):** TWA 5\n\n> NIOSH REL Ca TWA 5 mg/m3 ST 10 mg/m3\n\nSource: \n", "cas_number": "117-81-7", "file": "di-sec-octyl-phthalate.md", "generated": true, "harvested": "2026-09-08", "id": "di-sec-octyl-phthalate", "quote_cas_number": "CAS No. 117-81-7", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Di-sec octyl phthalate", "rel_mgm3": "TWA 5", "source_quote": "NIOSH REL Ca TWA 5 mg/m3 ST 10 mg/m3", "sources": ["https://www.cdc.gov/niosh/npg/npgd0236.html"], "stale_after": "2027-09-08", "substance": "Di-sec octyl phthalate", "title": "Di-sec octyl phthalate \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Diacetone alcohol; 4-hydroxy-4-methyl-2-pentanone\n\n**CAS No.:** 123422\n\n**PEL (ppm):** 50\n\n**PEL (mg/m\u00b3):** 240\n\n> 123422 | | Diacetone alcohol; 4-hydroxy-4-methyl-2-pentanone | 50 | 240\n\nSource: \n", "cas_number": "123422", "file": "diacetone-alcohol-4-hydroxy-4-methyl-2-pentanone-2.md", "generated": true, "harvested": "2026-08-05", "id": "diacetone-alcohol-4-hydroxy-4-methyl-2-pentanone-2", "pel_mgm3": "240", "pel_ppm": "50", "source_quote": "123422 | | Diacetone alcohol; 4-hydroxy-4-methyl-2-pentanone | 50 | 240", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Diacetone alcohol; 4-hydroxy-4-methyl-2-pentanone", "title": "Diacetone alcohol; 4-hydroxy-4-methyl-2-pentanone \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Diacetone alcohol (4-Hydroxy-4-methyl-2-pentanone)\n\n**CAS No.:** 123-42-2\n\n**PEL (ppm):** 50\n\n**PEL (mg/m\u00b3):** 240\n\n> Diacetone alcohol (4-Hydroxy-4-methyl-2-pentanone) | 123-42-2 | 50 | 240 | - |\n\nSource: \n", "cas_number": "123-42-2", "file": "diacetone-alcohol-4-hydroxy-4-methyl-2-pentanone.md", "generated": true, "harvested": "2026-08-05", "id": "diacetone-alcohol-4-hydroxy-4-methyl-2-pentanone", "pel_mgm3": "240", "pel_ppm": "50", "source_quote": "Diacetone alcohol (4-Hydroxy-4-methyl-2-pentanone) | 123-42-2 | 50 | 240 | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Diacetone alcohol (4-Hydroxy-4-methyl-2-pentanone)", "title": "Diacetone alcohol (4-Hydroxy-4-methyl-2-pentanone) \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Diacetone alcohol\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Diacetone alcohol\n\n**CAS No.:** 123-42-2\n\n> CAS No. 123-42-2\n\n**NIOSH REL (ppm):** TWA 50\n\n**NIOSH REL (mg/m\u00b3):** 240\n\n> NIOSH REL TWA 50 ppm (240 mg/m3)\n\nSource: \n", "cas_number": "123-42-2", "file": "diacetone-alcohol.md", "generated": true, "harvested": "2026-09-08", "id": "diacetone-alcohol", "quote_cas_number": "CAS No. 123-42-2", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Diacetone alcohol", "rel_mgm3": "240", "rel_ppm": "TWA 50", "source_quote": "NIOSH REL TWA 50 ppm (240 mg/m3)", "sources": ["https://www.cdc.gov/niosh/npg/npgd0178.html"], "stale_after": "2027-09-08", "substance": "Diacetone alcohol", "title": "Diacetone alcohol \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Diazinon; o,o-diethyl o-(2-isopropyl-6-methyl-4-pyrimidinyl) phosphorothioate\n\n**CAS No.:** 333415\n\n**PEL (mg/m\u00b3):** 0.1\n\n> 333415 | S | Diazinon; o,o-diethyl o-(2-isopropyl-6-methyl-4-pyrimidinyl) phosphorothioate | -- | 0.1\n\nSource: \n", "cas_number": "333415", "file": "diazinon-o-o-diethyl-o-2-isopropyl-6-methyl-4-pyrimidinyl-phosphorothioate.md", "generated": true, "harvested": "2026-08-05", "id": "diazinon-o-o-diethyl-o-2-isopropyl-6-methyl-4-pyrimidinyl-phosphorothioate", "pel_mgm3": "0.1", "source_quote": "333415 | S | Diazinon; o,o-diethyl o-(2-isopropyl-6-methyl-4-pyrimidinyl) phosphorothioate | -- | 0.1", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Diazinon; o,o-diethyl o-(2-isopropyl-6-methyl-4-pyrimidinyl) phosphorothioate", "title": "Diazinon; o,o-diethyl o-(2-isopropyl-6-methyl-4-pyrimidinyl) phosphorothioate \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Diazinon\u00ae\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Diazinon\u00ae\n\n**CAS No.:** 333-41-5\n\n> CAS No. 333-41-5\n\n**NIOSH REL (mg/m\u00b3):** TWA 0.1\n\n> NIOSH REL TWA 0.1 mg/m3 [skin]\n\nSource: \n", "cas_number": "333-41-5", "file": "diazinon.md", "generated": true, "harvested": "2026-09-08", "id": "diazinon", "quote_cas_number": "CAS No. 333-41-5", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Diazinon\u00ae", "rel_mgm3": "TWA 0.1", "source_quote": "NIOSH REL TWA 0.1 mg/m3 [skin]", "sources": ["https://www.cdc.gov/niosh/npg/npgd0181.html"], "stale_after": "2027-09-08", "substance": "Diazinon\u00ae", "title": "Diazinon\u00ae \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Diazomethane\n\n**CAS No.:** 334883\n\n**PEL (ppm):** 0.2\n\n**PEL (mg/m\u00b3):** 0.4\n\n> 334883 | | Diazomethane | 0.2 | 0.4\n\nSource: \n", "cas_number": "334883", "file": "diazomethane-2.md", "generated": true, "harvested": "2026-08-05", "id": "diazomethane-2", "pel_mgm3": "0.4", "pel_ppm": "0.2", "source_quote": "334883 | | Diazomethane | 0.2 | 0.4", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Diazomethane", "title": "Diazomethane \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Diazomethane\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Diazomethane\n\n**CAS No.:** 334-88-3\n\n> CAS No. 334-88-3\n\n**NIOSH REL (ppm):** TWA 0.2\n\n**NIOSH REL (mg/m\u00b3):** 0.4\n\n> NIOSH REL TWA 0.2 ppm (0.4 mg/m3)\n\nSource: \n", "cas_number": "334-88-3", "file": "diazomethane-3.md", "generated": true, "harvested": "2026-09-08", "id": "diazomethane-3", "quote_cas_number": "CAS No. 334-88-3", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Diazomethane", "rel_mgm3": "0.4", "rel_ppm": "TWA 0.2", "source_quote": "NIOSH REL TWA 0.2 ppm (0.4 mg/m3)", "sources": ["https://www.cdc.gov/niosh/npg/npgd0182.html"], "stale_after": "2027-09-08", "substance": "Diazomethane", "title": "Diazomethane \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Diazomethane\n\n**CAS No.:** 334-88-3\n\n**PEL (ppm):** 0.2\n\n**PEL (mg/m\u00b3):** 0.4\n\n> Diazomethane | 334-88-3 | 0.2 | 0.4 | - |\n\nSource: \n", "cas_number": "334-88-3", "file": "diazomethane.md", "generated": true, "harvested": "2026-08-05", "id": "diazomethane", "pel_mgm3": "0.4", "pel_ppm": "0.2", "source_quote": "Diazomethane | 334-88-3 | 0.2 | 0.4 | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Diazomethane", "title": "Diazomethane \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Dibenzoyl peroxide; see Benzoyl peroxide\n\n**CAS No.:** 94360\n\n> 94360 | | Dibenzoyl peroxide; see Benzoyl peroxide\n\nSource: \n", "cas_number": "94360", "file": "dibenzoyl-peroxide-see-benzoyl-peroxide.md", "generated": true, "harvested": "2026-08-05", "id": "dibenzoyl-peroxide-see-benzoyl-peroxide", "source_quote": "94360 | | Dibenzoyl peroxide; see Benzoyl peroxide", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Dibenzoyl peroxide; see Benzoyl peroxide", "title": "Dibenzoyl peroxide; see Benzoyl peroxide \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Diborane\n\n**CAS No.:** 19287457\n\n**PEL (ppm):** 0.1\n\n**PEL (mg/m\u00b3):** 0.1\n\n> 19287457 | | Diborane | 0.1 | 0.1\n\nSource: \n", "cas_number": "19287457", "file": "diborane-2.md", "generated": true, "harvested": "2026-08-05", "id": "diborane-2", "pel_mgm3": "0.1", "pel_ppm": "0.1", "source_quote": "19287457 | | Diborane | 0.1 | 0.1", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Diborane", "title": "Diborane \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Diborane\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Diborane\n\n**CAS No.:** 19287-45-7\n\n> CAS No. 19287-45-7\n\n**NIOSH REL (ppm):** TWA 0.1\n\n**NIOSH REL (mg/m\u00b3):** 0.1\n\n> NIOSH REL TWA 0.1 ppm (0.1 mg/m3)\n\nSource: \n", "cas_number": "19287-45-7", "file": "diborane-3.md", "generated": true, "harvested": "2026-09-08", "id": "diborane-3", "quote_cas_number": "CAS No. 19287-45-7", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Diborane", "rel_mgm3": "0.1", "rel_ppm": "TWA 0.1", "source_quote": "NIOSH REL TWA 0.1 ppm (0.1 mg/m3)", "sources": ["https://www.cdc.gov/niosh/npg/npgd0183.html"], "stale_after": "2027-09-08", "substance": "Diborane", "title": "Diborane \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Diborane\n\n**CAS No.:** 19287-45-7\n\n**PEL (ppm):** 0.1\n\n**PEL (mg/m\u00b3):** 0.1\n\n> Diborane | 19287-45-7 | 0.1 | 0.1 | - |\n\nSource: \n", "cas_number": "19287-45-7", "file": "diborane.md", "generated": true, "harvested": "2026-08-05", "id": "diborane", "pel_mgm3": "0.1", "pel_ppm": "0.1", "source_quote": "Diborane | 19287-45-7 | 0.1 | 0.1 | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Diborane", "title": "Diborane \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Dibromodifluoromethane; see Difluorodibromomethane\n\n**CAS No.:** 75616\n\n> 75616 | | Dibromodifluoromethane; see Difluorodibromomethane\n\nSource: \n", "cas_number": "75616", "file": "dibromodifluoromethane-see-difluorodibromomethane.md", "generated": true, "harvested": "2026-08-05", "id": "dibromodifluoromethane-see-difluorodibromomethane", "source_quote": "75616 | | Dibromodifluoromethane; see Difluorodibromomethane", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Dibromodifluoromethane; see Difluorodibromomethane", "title": "Dibromodifluoromethane; see Difluorodibromomethane \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Dibutyl phenyl phosphate\n\n**CAS No.:** 2528361\n\n**PEL (ppm):** 0.3\n\n**PEL (mg/m\u00b3):** 3.5\n\n> 2528361 | S | Dibutyl phenyl phosphate | 0.3 | 3.5\n\nSource: \n", "cas_number": "2528361", "file": "dibutyl-phenyl-phosphate.md", "generated": true, "harvested": "2026-08-05", "id": "dibutyl-phenyl-phosphate", "pel_mgm3": "3.5", "pel_ppm": "0.3", "source_quote": "2528361 | S | Dibutyl phenyl phosphate | 0.3 | 3.5", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Dibutyl phenyl phosphate", "title": "Dibutyl phenyl phosphate \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Dibutyl phosphate\n\n**CAS No.:** 107664\n\n**PEL (ppm):** 1\n\n**PEL (mg/m\u00b3):** 5\n\n**STEL (ppm):** 2\n\n**STEL (mg/m\u00b3):** 10\n\n> 107664 | | Dibutyl phosphate | 1 | 5 | | 2 | 10\n\nSource: \n", "cas_number": "107664", "file": "dibutyl-phosphate-2.md", "generated": true, "harvested": "2026-08-05", "id": "dibutyl-phosphate-2", "pel_mgm3": "5", "pel_ppm": "1", "source_quote": "107664 | | Dibutyl phosphate | 1 | 5 | | 2 | 10", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "stel_mgm3": "10", "stel_ppm": "2", "substance": "Dibutyl phosphate", "title": "Dibutyl phosphate \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Dibutyl phosphate\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Dibutyl phosphate\n\n**CAS No.:** 107-66-4\n\n> CAS No. 107-66-4\n\n**NIOSH REL (ppm):** TWA 1\n\n**NIOSH REL (mg/m\u00b3):** 5\n\n> NIOSH REL TWA 1 ppm (5 mg/m3) ST 2 ppm (10 mg/m3)\n\nSource: \n", "cas_number": "107-66-4", "file": "dibutyl-phosphate-3.md", "generated": true, "harvested": "2026-09-08", "id": "dibutyl-phosphate-3", "quote_cas_number": "CAS No. 107-66-4", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Dibutyl phosphate", "rel_mgm3": "5", "rel_ppm": "TWA 1", "source_quote": "NIOSH REL TWA 1 ppm (5 mg/m3) ST 2 ppm (10 mg/m3)", "sources": ["https://www.cdc.gov/niosh/npg/npgd0186.html"], "stale_after": "2027-09-08", "substance": "Dibutyl phosphate", "title": "Dibutyl phosphate \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Dibutyl phosphate\n\n**CAS No.:** 107-66-4\n\n**PEL (ppm):** 1\n\n**PEL (mg/m\u00b3):** 5\n\n> Dibutyl phosphate | 107-66-4 | 1 | 5 | - |\n\nSource: \n", "cas_number": "107-66-4", "file": "dibutyl-phosphate.md", "generated": true, "harvested": "2026-08-05", "id": "dibutyl-phosphate", "pel_mgm3": "5", "pel_ppm": "1", "source_quote": "Dibutyl phosphate | 107-66-4 | 1 | 5 | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Dibutyl phosphate", "title": "Dibutyl phosphate \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Dibutyl phthalate\n\n**CAS No.:** 84742\n\n**PEL (mg/m\u00b3):** 5\n\n> 84742 | | Dibutyl phthalate | -- | 5\n\nSource: \n", "cas_number": "84742", "file": "dibutyl-phthalate-2.md", "generated": true, "harvested": "2026-08-05", "id": "dibutyl-phthalate-2", "pel_mgm3": "5", "source_quote": "84742 | | Dibutyl phthalate | -- | 5", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Dibutyl phthalate", "title": "Dibutyl phthalate \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Dibutyl phthalate\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Dibutyl phthalate\n\n**CAS No.:** 84-74-2\n\n> CAS No. 84-74-2\n\n**NIOSH REL (mg/m\u00b3):** TWA 5\n\n> NIOSH REL TWA 5 mg/m3\n\nSource: \n", "cas_number": "84-74-2", "file": "dibutyl-phthalate-3.md", "generated": true, "harvested": "2026-09-08", "id": "dibutyl-phthalate-3", "quote_cas_number": "CAS No. 84-74-2", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Dibutyl phthalate", "rel_mgm3": "TWA 5", "source_quote": "NIOSH REL TWA 5 mg/m3", "sources": ["https://www.cdc.gov/niosh/npg/npgd0187.html"], "stale_after": "2027-09-08", "substance": "Dibutyl phthalate", "title": "Dibutyl phthalate \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Dibutyl phthalate\n\n**CAS No.:** 84-74-2\n\n**PEL (mg/m\u00b3):** 5\n\n> Dibutyl phthalate | 84-74-2 | - | 5 | - |\n\nSource: \n", "cas_number": "84-74-2", "file": "dibutyl-phthalate.md", "generated": true, "harvested": "2026-08-05", "id": "dibutyl-phthalate", "pel_mgm3": "5", "source_quote": "Dibutyl phthalate | 84-74-2 | - | 5 | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Dibutyl phthalate", "title": "Dibutyl phthalate \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Dichloroacetylene\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Dichloroacetylene\n\n**CAS No.:** 7572-29-4\n\n> CAS No. 7572-29-4\n\n**NIOSH REL (ppm):** C 0.1\n\n**NIOSH REL (mg/m\u00b3):** 0.4\n\n> NIOSH REL Ca C 0.1 ppm (0.4 mg/m3)\n\nSource: \n", "cas_number": "7572-29-4", "file": "dichloroacetylene-2.md", "generated": true, "harvested": "2026-09-08", "id": "dichloroacetylene-2", "quote_cas_number": "CAS No. 7572-29-4", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Dichloroacetylene", "rel_mgm3": "0.4", "rel_ppm": "C 0.1", "source_quote": "NIOSH REL Ca C 0.1 ppm (0.4 mg/m3)", "sources": ["https://www.cdc.gov/niosh/npg/npgd0188.html"], "stale_after": "2027-09-08", "substance": "Dichloroacetylene", "title": "Dichloroacetylene \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Dichloroacetylene\n\n**CAS No.:** 7572294\n\n**PEL (ppm):** 0.1\n\n**PEL (mg/m\u00b3):** 0.4\n\n**Ceiling:** C\n\n> 7572294 | | Dichloroacetylene | 0.1 | 0.4 | C\n\nSource: \n", "cas_number": "7572294", "ceiling": "C", "file": "dichloroacetylene.md", "generated": true, "harvested": "2026-08-05", "id": "dichloroacetylene", "pel_mgm3": "0.4", "pel_ppm": "0.1", "source_quote": "7572294 | | Dichloroacetylene | 0.1 | 0.4 | C", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Dichloroacetylene", "title": "Dichloroacetylene \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Dichlorodifluoromethane\n\n**CAS No.:** 75718\n\n**PEL (ppm):** 1000\n\n**PEL (mg/m\u00b3):** 4950\n\n**Ceiling:** 6200 ppm\n\n> 75718 | | Dichlorodifluoromethane | 1000 | 4950 | 6200 ppm\n\nSource: \n", "cas_number": "75718", "ceiling": "6200 ppm", "file": "dichlorodifluoromethane-2.md", "generated": true, "harvested": "2026-08-05", "id": "dichlorodifluoromethane-2", "pel_mgm3": "4950", "pel_ppm": "1000", "source_quote": "75718 | | Dichlorodifluoromethane | 1000 | 4950 | 6200 ppm", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Dichlorodifluoromethane", "title": "Dichlorodifluoromethane \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Dichlorodifluoromethane\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Dichlorodifluoromethane\n\n**CAS No.:** 75-71-8\n\n> CAS No. 75-71-8\n\n**NIOSH REL (ppm):** TWA 1000\n\n**NIOSH REL (mg/m\u00b3):** 4950\n\n> NIOSH REL TWA 1000 ppm (4950 mg/m3)\n\nSource: \n", "cas_number": "75-71-8", "file": "dichlorodifluoromethane-3.md", "generated": true, "harvested": "2026-09-08", "id": "dichlorodifluoromethane-3", "quote_cas_number": "CAS No. 75-71-8", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Dichlorodifluoromethane", "rel_mgm3": "4950", "rel_ppm": "TWA 1000", "source_quote": "NIOSH REL TWA 1000 ppm (4950 mg/m3)", "sources": ["https://www.cdc.gov/niosh/npg/npgd0192.html"], "stale_after": "2027-09-08", "substance": "Dichlorodifluoromethane", "title": "Dichlorodifluoromethane \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Dichlorodifluoromethane\n\n**CAS No.:** 75-71-8\n\n**PEL (ppm):** 1000\n\n**PEL (mg/m\u00b3):** 4950\n\n> Dichlorodifluoromethane | 75-71-8 | 1000 | 4950 | - |\n\nSource: \n", "cas_number": "75-71-8", "file": "dichlorodifluoromethane.md", "generated": true, "harvested": "2026-08-05", "id": "dichlorodifluoromethane", "pel_mgm3": "4950", "pel_ppm": "1000", "source_quote": "Dichlorodifluoromethane | 75-71-8 | 1000 | 4950 | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Dichlorodifluoromethane", "title": "Dichlorodifluoromethane \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Dichlorodiphenyltrichloroethane (DDT)\n\n**CAS No.:** 50-29-3\n\n**PEL (mg/m\u00b3):** 1\n\n> Dichlorodiphenyltrichloroethane (DDT) | 50-29-3 | - | 1 | X |\n\nSource: \n", "cas_number": "50-29-3", "file": "dichlorodiphenyltrichloroethane-ddt.md", "generated": true, "harvested": "2026-08-05", "id": "dichlorodiphenyltrichloroethane-ddt", "pel_mgm3": "1", "source_quote": "Dichlorodiphenyltrichloroethane (DDT) | 50-29-3 | - | 1 | X |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Dichlorodiphenyltrichloroethane (DDT)", "title": "Dichlorodiphenyltrichloroethane (DDT) \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Dichloroethyl ether\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Dichloroethyl ether\n\n**CAS No.:** 111-44-4\n\n> CAS No. 111-44-4\n\n**NIOSH REL (ppm):** TWA 5\n\n**NIOSH REL (mg/m\u00b3):** 30\n\n> NIOSH REL Ca TWA 5 ppm (30 mg/m3) ST 10 ppm (60 mg/m3) [skin]\n\nSource: \n", "cas_number": "111-44-4", "file": "dichloroethyl-ether-2.md", "generated": true, "harvested": "2026-09-08", "id": "dichloroethyl-ether-2", "quote_cas_number": "CAS No. 111-44-4", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Dichloroethyl ether", "rel_mgm3": "30", "rel_ppm": "TWA 5", "source_quote": "NIOSH REL Ca TWA 5 ppm (30 mg/m3) ST 10 ppm (60 mg/m3) [skin]", "sources": ["https://www.cdc.gov/niosh/npg/npgd0196.html"], "stale_after": "2027-09-08", "substance": "Dichloroethyl ether", "title": "Dichloroethyl ether \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Dichloroethyl ether; bis(2-chloroethyl) ether\n\n**CAS No.:** 111444\n\n**PEL (ppm):** 5\n\n**PEL (mg/m\u00b3):** 30\n\n**STEL (ppm):** 10\n\n**STEL (mg/m\u00b3):** 60\n\n> 111444 | S | Dichloroethyl ether; bis(2-chloroethyl) ether | 5 | 30 | | 10 | 60\n\nSource: \n", "cas_number": "111444", "file": "dichloroethyl-ether-bis-2-chloroethyl-ether.md", "generated": true, "harvested": "2026-08-05", "id": "dichloroethyl-ether-bis-2-chloroethyl-ether", "pel_mgm3": "30", "pel_ppm": "5", "source_quote": "111444 | S | Dichloroethyl ether; bis(2-chloroethyl) ether | 5 | 30 | | 10 | 60", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "stel_mgm3": "60", "stel_ppm": "10", "substance": "Dichloroethyl ether; bis(2-chloroethyl) ether", "title": "Dichloroethyl ether; bis(2-chloroethyl) ether \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Dichloroethyl ether\n\n**CAS No.:** 111-44-4\n\n**PEL (ppm):** (C)15\n\n**PEL (mg/m\u00b3):** (C)90\n\n> Dichloroethyl ether | 111-44-4 | (C)15 | (C)90 | X |\n\nSource: \n", "cas_number": "111-44-4", "file": "dichloroethyl-ether.md", "generated": true, "harvested": "2026-08-05", "id": "dichloroethyl-ether", "pel_mgm3": "(C)90", "pel_ppm": "(C)15", "source_quote": "Dichloroethyl ether | 111-44-4 | (C)15 | (C)90 | X |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Dichloroethyl ether", "title": "Dichloroethyl ether \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Dichlorofluoromethane; Fluorocarbon 21\n\n**CAS No.:** 75434\n\n**PEL (ppm):** 10\n\n**PEL (mg/m\u00b3):** 42\n\n> 75434 | | Dichlorofluoromethane; Fluorocarbon 21 | 10 | 42\n\nSource: \n", "cas_number": "75434", "file": "dichlorofluoromethane-fluorocarbon-21.md", "generated": true, "harvested": "2026-08-05", "id": "dichlorofluoromethane-fluorocarbon-21", "pel_mgm3": "42", "pel_ppm": "10", "source_quote": "75434 | | Dichlorofluoromethane; Fluorocarbon 21 | 10 | 42", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Dichlorofluoromethane; Fluorocarbon 21", "title": "Dichlorofluoromethane; Fluorocarbon 21 \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Dichloromethane; see Methylene chloride\n\n**CAS No.:** 75092\n\n> 75092 | | Dichloromethane; see Methylene chloride\n\nSource: \n", "cas_number": "75092", "file": "dichloromethane-see-methylene-chloride.md", "generated": true, "harvested": "2026-08-05", "id": "dichloromethane-see-methylene-chloride", "source_quote": "75092 | | Dichloromethane; see Methylene chloride", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Dichloromethane; see Methylene chloride", "title": "Dichloromethane; see Methylene chloride \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Dichloromonofluoromethane\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Dichloromonofluoromethane\n\n**CAS No.:** 75-43-4\n\n> CAS No. 75-43-4\n\n**NIOSH REL (ppm):** TWA 10\n\n**NIOSH REL (mg/m\u00b3):** 40\n\n> NIOSH REL TWA 10 ppm (40 mg/m3)\n\nSource: \n", "cas_number": "75-43-4", "file": "dichloromonofluoromethane-2.md", "generated": true, "harvested": "2026-09-08", "id": "dichloromonofluoromethane-2", "quote_cas_number": "CAS No. 75-43-4", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Dichloromonofluoromethane", "rel_mgm3": "40", "rel_ppm": "TWA 10", "source_quote": "NIOSH REL TWA 10 ppm (40 mg/m3)", "sources": ["https://www.cdc.gov/niosh/npg/npgd0197.html"], "stale_after": "2027-09-08", "substance": "Dichloromonofluoromethane", "title": "Dichloromonofluoromethane \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Dichloromonofluoromethane\n\n**CAS No.:** 75-43-4\n\n**PEL (ppm):** 1000\n\n**PEL (mg/m\u00b3):** 4200\n\n> Dichloromonofluoromethane | 75-43-4 | 1000 | 4200 | - |\n\nSource: \n", "cas_number": "75-43-4", "file": "dichloromonofluoromethane.md", "generated": true, "harvested": "2026-08-05", "id": "dichloromonofluoromethane", "pel_mgm3": "4200", "pel_ppm": "1000", "source_quote": "Dichloromonofluoromethane | 75-43-4 | 1000 | 4200 | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Dichloromonofluoromethane", "title": "Dichloromonofluoromethane \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Dichloropropene\n\n**CAS No.:** 542756\n\n**PEL (ppm):** 1\n\n**PEL (mg/m\u00b3):** 5\n\n> 542756 | S | Dichloropropene | 1 | 5\n\nSource: \n", "cas_number": "542756", "file": "dichloropropene.md", "generated": true, "harvested": "2026-08-05", "id": "dichloropropene", "pel_mgm3": "5", "pel_ppm": "1", "source_quote": "542756 | S | Dichloropropene | 1 | 5", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Dichloropropene", "title": "Dichloropropene \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Dichlorotetrafluoroethane\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Dichlorotetrafluoroethane\n\n**CAS No.:** 76-14-2\n\n> CAS No. 76-14-2\n\n**NIOSH REL (ppm):** TWA 1000\n\n**NIOSH REL (mg/m\u00b3):** 7000\n\n> NIOSH REL TWA 1000 ppm (7000 mg/m3)\n\nSource: \n", "cas_number": "76-14-2", "file": "dichlorotetrafluoroethane-2.md", "generated": true, "harvested": "2026-09-08", "id": "dichlorotetrafluoroethane-2", "quote_cas_number": "CAS No. 76-14-2", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Dichlorotetrafluoroethane", "rel_mgm3": "7000", "rel_ppm": "TWA 1000", "source_quote": "NIOSH REL TWA 1000 ppm (7000 mg/m3)", "sources": ["https://www.cdc.gov/niosh/npg/npgd0201.html"], "stale_after": "2027-09-08", "substance": "Dichlorotetrafluoroethane", "title": "Dichlorotetrafluoroethane \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Dichlorotetrafluoroethane\n\n**CAS No.:** 76-14-2\n\n**PEL (ppm):** 1000\n\n**PEL (mg/m\u00b3):** 7000\n\n> Dichlorotetrafluoroethane | 76-14-2 | 1000 | 7000 | - |\n\nSource: \n", "cas_number": "76-14-2", "file": "dichlorotetrafluoroethane.md", "generated": true, "harvested": "2026-08-05", "id": "dichlorotetrafluoroethane", "pel_mgm3": "7000", "pel_ppm": "1000", "source_quote": "Dichlorotetrafluoroethane | 76-14-2 | 1000 | 7000 | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Dichlorotetrafluoroethane", "title": "Dichlorotetrafluoroethane \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Dichlorvos (DDVP); 2,2-dichlorovinyl dimethyl phosphate\n\n**CAS No.:** 62737\n\n**PEL (ppm):** 0.1\n\n**PEL (mg/m\u00b3):** 1\n\n> 62737 | S | Dichlorvos (DDVP); 2,2-dichlorovinyl dimethyl phosphate | 0.1 | 1\n\nSource: \n", "cas_number": "62737", "file": "dichlorvos-ddvp-2-2-dichlorovinyl-dimethyl-phosphate.md", "generated": true, "harvested": "2026-08-05", "id": "dichlorvos-ddvp-2-2-dichlorovinyl-dimethyl-phosphate", "pel_mgm3": "1", "pel_ppm": "0.1", "source_quote": "62737 | S | Dichlorvos (DDVP); 2,2-dichlorovinyl dimethyl phosphate | 0.1 | 1", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Dichlorvos (DDVP); 2,2-dichlorovinyl dimethyl phosphate", "title": "Dichlorvos (DDVP); 2,2-dichlorovinyl dimethyl phosphate \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Dichlorvos (DDVP)\n\n**CAS No.:** 62-73-7\n\n**PEL (mg/m\u00b3):** 1\n\n> Dichlorvos (DDVP) | 62-73-7 | - | 1 | X |\n\nSource: \n", "cas_number": "62-73-7", "file": "dichlorvos-ddvp.md", "generated": true, "harvested": "2026-08-05", "id": "dichlorvos-ddvp", "pel_mgm3": "1", "source_quote": "Dichlorvos (DDVP) | 62-73-7 | - | 1 | X |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Dichlorvos (DDVP)", "title": "Dichlorvos (DDVP) \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Dichlorvos\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Dichlorvos\n\n**CAS No.:** 62-73-7\n\n> CAS No. 62-73-7\n\n**NIOSH REL (mg/m\u00b3):** TWA 1\n\n> NIOSH REL TWA 1 mg/m3 [skin]\n\nSource: \n", "cas_number": "62-73-7", "file": "dichlorvos.md", "generated": true, "harvested": "2026-09-08", "id": "dichlorvos", "quote_cas_number": "CAS No. 62-73-7", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Dichlorvos", "rel_mgm3": "TWA 1", "source_quote": "NIOSH REL TWA 1 mg/m3 [skin]", "sources": ["https://www.cdc.gov/niosh/npg/npgd0202.html"], "stale_after": "2027-09-08", "substance": "Dichlorvos", "title": "Dichlorvos \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Dicrotophos\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Dicrotophos\n\n**CAS No.:** 141-66-2\n\n> CAS No. 141-66-2\n\n**NIOSH REL (mg/m\u00b3):** TWA 0.25\n\n> NIOSH REL TWA 0.25 mg/m3 [skin]\n\nSource: \n", "cas_number": "141-66-2", "file": "dicrotophos-2.md", "generated": true, "harvested": "2026-09-08", "id": "dicrotophos-2", "quote_cas_number": "CAS No. 141-66-2", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Dicrotophos", "rel_mgm3": "TWA 0.25", "source_quote": "NIOSH REL TWA 0.25 mg/m3 [skin]", "sources": ["https://www.cdc.gov/niosh/npg/npgd0203.html"], "stale_after": "2027-09-08", "substance": "Dicrotophos", "title": "Dicrotophos \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Dicrotophos\n\n**CAS No.:** 141662\n\n**PEL (mg/m\u00b3):** 0.25\n\n> 141662 | S | Dicrotophos | -- | 0.25\n\nSource: \n", "cas_number": "141662", "file": "dicrotophos.md", "generated": true, "harvested": "2026-08-05", "id": "dicrotophos", "pel_mgm3": "0.25", "source_quote": "141662 | S | Dicrotophos | -- | 0.25", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Dicrotophos", "title": "Dicrotophos \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Dicyclohexylmethane-4,4'-diisocyanate; see Methylene bis-(4-cyclohexylisocyanate)\n\n**CAS No.:** 5124301\n\n> 5124301 | | Dicyclohexylmethane-4,4'-diisocyanate; see Methylene bis-(4-cyclohexylisocyanate)\n\nSource: \n", "cas_number": "5124301", "file": "dicyclohexylmethane-4-4-diisocyanate-see-methylene-bis-4-cyclohexylisocyanate.md", "generated": true, "harvested": "2026-08-05", "id": "dicyclohexylmethane-4-4-diisocyanate-see-methylene-bis-4-cyclohexylisocyanate", "source_quote": "5124301 | | Dicyclohexylmethane-4,4'-diisocyanate; see Methylene bis-(4-cyclohexylisocyanate)", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Dicyclohexylmethane-4,4'-diisocyanate; see Methylene bis-(4-cyclohexylisocyanate)", "title": "Dicyclohexylmethane-4,4'-diisocyanate; see Methylene bis-(4-cyclohexylisocyanate) \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Dicyclopentadiene\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Dicyclopentadiene\n\n**CAS No.:** 77-73-6\n\n> CAS No. 77-73-6\n\n**NIOSH REL (ppm):** TWA 5\n\n**NIOSH REL (mg/m\u00b3):** 30\n\n> NIOSH REL TWA 5 ppm (30 mg/m3)\n\nSource: \n", "cas_number": "77-73-6", "file": "dicyclopentadiene-2.md", "generated": true, "harvested": "2026-09-08", "id": "dicyclopentadiene-2", "quote_cas_number": "CAS No. 77-73-6", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Dicyclopentadiene", "rel_mgm3": "30", "rel_ppm": "TWA 5", "source_quote": "NIOSH REL TWA 5 ppm (30 mg/m3)", "sources": ["https://www.cdc.gov/niosh/npg/npgd0204.html"], "stale_after": "2027-09-08", "substance": "Dicyclopentadiene", "title": "Dicyclopentadiene \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Dicyclopentadiene\n\n**CAS No.:** 77736\n\n**PEL (ppm):** 5\n\n**PEL (mg/m\u00b3):** 30\n\n> 77736 | | Dicyclopentadiene | 5 | 30\n\nSource: \n", "cas_number": "77736", "file": "dicyclopentadiene.md", "generated": true, "harvested": "2026-08-05", "id": "dicyclopentadiene", "pel_mgm3": "30", "pel_ppm": "5", "source_quote": "77736 | | Dicyclopentadiene | 5 | 30", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Dicyclopentadiene", "title": "Dicyclopentadiene \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Dicyclopentadienyl iron\n\n**CAS No.:** 102545\n\n> 102545 | | Dicyclopentadienyl iron | --\n\nSource: \n", "cas_number": "102545", "file": "dicyclopentadienyl-iron-2.md", "generated": true, "harvested": "2026-08-05", "id": "dicyclopentadienyl-iron-2", "source_quote": "102545 | | Dicyclopentadienyl iron | --", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Dicyclopentadienyl iron", "title": "Dicyclopentadienyl iron \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Dicyclopentadienyl iron\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Dicyclopentadienyl iron\n\n**CAS No.:** 102-54-5\n\n> CAS No. 102-54-5\n\n**NIOSH REL, as stated:** TWA 10 mg/m3 (total) TWA 5 mg/m3 (resp)\n\n> NIOSH REL TWA 10 mg/m3 (total) TWA 5 mg/m3 (resp)\n\nSource: \n", "cas_number": "102-54-5", "file": "dicyclopentadienyl-iron-3.md", "generated": true, "harvested": "2026-09-08", "id": "dicyclopentadienyl-iron-3", "quote_cas_number": "CAS No. 102-54-5", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Dicyclopentadienyl iron", "rel_statement": "TWA 10 mg/m3 (total) TWA 5 mg/m3 (resp)", "source_quote": "NIOSH REL TWA 10 mg/m3 (total) TWA 5 mg/m3 (resp)", "sources": ["https://www.cdc.gov/niosh/npg/npgd0205.html"], "stale_after": "2027-09-08", "substance": "Dicyclopentadienyl iron", "title": "Dicyclopentadienyl iron \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Dicyclopentadienyl iron\n\n**CAS No.:** 102-54-5\n\n> Dicyclopentadienyl iron | 102-54-5 | - | - | - |\n\nSource: \n", "cas_number": "102-54-5", "file": "dicyclopentadienyl-iron.md", "generated": true, "harvested": "2026-08-05", "id": "dicyclopentadienyl-iron", "source_quote": "Dicyclopentadienyl iron | 102-54-5 | - | - | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Dicyclopentadienyl iron", "title": "Dicyclopentadienyl iron \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Dieldrin; 1,2,3,4,10,10-hexachloro-6,7-epoxy-1,4,4a,5,6,7,8,8a-octahydro-1,4-endo-exo-5,8-dimethanonaphthalene\n\n**CAS No.:** 60571\n\n**PEL (mg/m\u00b3):** 0.25\n\n> 60571 | S | Dieldrin; 1,2,3,4,10,10-hexachloro-6,7-epoxy-1,4,4a,5,6,7,8,8a-octahydro-1,4-endo-exo-5,8-dimethanonaphthalene | -- | 0.25\n\nSource: \n", "cas_number": "60571", "file": "dieldrin-1-2-3-4-10-10-hexachloro-6-7-epoxy-1-4-4a-5-6-7-8-8a-octahydro-1-4-endo.md", "generated": true, "harvested": "2026-08-05", "id": "dieldrin-1-2-3-4-10-10-hexachloro-6-7-epoxy-1-4-4a-5-6-7-8-8a-octahydro-1-4-endo", "pel_mgm3": "0.25", "source_quote": "60571 | S | Dieldrin; 1,2,3,4,10,10-hexachloro-6,7-epoxy-1,4,4a,5,6,7,8,8a-octahydro-1,4-endo-exo-5,8-dimethanonaphthalene | -- | 0.25", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Dieldrin; 1,2,3,4,10,10-hexachloro-6,7-epoxy-1,4,4a,5,6,7,8,8a-octahydro-1,4-endo-exo-5,8-dimethanonaphthalene", "title": "Dieldrin; 1,2,3,4,10,10-hexachloro-6,7-epoxy-1,4,4a,5,6,7,8,8a-octahydro-1,4-endo-exo-5,8-dimethanonaphthalene \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Dieldrin\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Dieldrin\n\n**CAS No.:** 60-57-1\n\n> CAS No. 60-57-1\n\n**NIOSH REL (mg/m\u00b3):** TWA 0.25\n\n> NIOSH REL Ca TWA 0.25 mg/m3 [skin]\n\nSource: \n", "cas_number": "60-57-1", "file": "dieldrin-2.md", "generated": true, "harvested": "2026-09-08", "id": "dieldrin-2", "quote_cas_number": "CAS No. 60-57-1", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Dieldrin", "rel_mgm3": "TWA 0.25", "source_quote": "NIOSH REL Ca TWA 0.25 mg/m3 [skin]", "sources": ["https://www.cdc.gov/niosh/npg/npgd0206.html"], "stale_after": "2027-09-08", "substance": "Dieldrin", "title": "Dieldrin \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Dieldrin\n\n**CAS No.:** 60-57-1\n\n**PEL (mg/m\u00b3):** 0.25\n\n> Dieldrin | 60-57-1 | - | 0.25 | X |\n\nSource: \n", "cas_number": "60-57-1", "file": "dieldrin.md", "generated": true, "harvested": "2026-08-05", "id": "dieldrin", "pel_mgm3": "0.25", "source_quote": "Dieldrin | 60-57-1 | - | 0.25 | X |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Dieldrin", "title": "Dieldrin \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Diethanolamine\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Diethanolamine\n\n**CAS No.:** 111-42-2\n\n> CAS No. 111-42-2\n\n**NIOSH REL (ppm):** TWA 3\n\n**NIOSH REL (mg/m\u00b3):** 15\n\n> NIOSH REL TWA 3 ppm (15 mg/m3)\n\nSource: \n", "cas_number": "111-42-2", "file": "diethanolamine-2.md", "generated": true, "harvested": "2026-09-08", "id": "diethanolamine-2", "quote_cas_number": "CAS No. 111-42-2", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Diethanolamine", "rel_mgm3": "15", "rel_ppm": "TWA 3", "source_quote": "NIOSH REL TWA 3 ppm (15 mg/m3)", "sources": ["https://www.cdc.gov/niosh/npg/npgd0208.html"], "stale_after": "2027-09-08", "substance": "Diethanolamine", "title": "Diethanolamine \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Diethanolamine\n\n**CAS No.:** 111422\n\n**PEL (ppm):** 0.46\n\n**PEL (mg/m\u00b3):** 2\n\n> 111422 | S | Diethanolamine | 0.46 | 2\n\nSource: \n", "cas_number": "111422", "file": "diethanolamine.md", "generated": true, "harvested": "2026-08-05", "id": "diethanolamine", "pel_mgm3": "2", "pel_ppm": "0.46", "source_quote": "111422 | S | Diethanolamine | 0.46 | 2", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Diethanolamine", "title": "Diethanolamine \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Diethyl ether; see Ethyl ether\n\n**CAS No.:** 60297\n\n> 60297 | | Diethyl ether; see Ethyl ether\n\nSource: \n", "cas_number": "60297", "file": "diethyl-ether-see-ethyl-ether.md", "generated": true, "harvested": "2026-08-05", "id": "diethyl-ether-see-ethyl-ether", "source_quote": "60297 | | Diethyl ether; see Ethyl ether", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Diethyl ether; see Ethyl ether", "title": "Diethyl ether; see Ethyl ether \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Diethyl ketone\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Diethyl ketone\n\n**CAS No.:** 96-22-0\n\n> CAS No. 96-22-0\n\n**NIOSH REL (ppm):** TWA 200\n\n**NIOSH REL (mg/m\u00b3):** 705\n\n> NIOSH REL TWA 200 ppm (705 mg/m3)\n\nSource: \n", "cas_number": "96-22-0", "file": "diethyl-ketone-2.md", "generated": true, "harvested": "2026-09-08", "id": "diethyl-ketone-2", "quote_cas_number": "CAS No. 96-22-0", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Diethyl ketone", "rel_mgm3": "705", "rel_ppm": "TWA 200", "source_quote": "NIOSH REL TWA 200 ppm (705 mg/m3)", "sources": ["https://www.cdc.gov/niosh/npg/npgd0212.html"], "stale_after": "2027-09-08", "substance": "Diethyl ketone", "title": "Diethyl ketone \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Diethyl ketone\n\n**CAS No.:** 96220\n\n**PEL (ppm):** 200\n\n**PEL (mg/m\u00b3):** 705\n\n**STEL (ppm):** 300\n\n**STEL (mg/m\u00b3):** 1057\n\n> 96220 | | Diethyl ketone | 200 | 705 | | 300 | 1057\n\nSource: \n", "cas_number": "96220", "file": "diethyl-ketone.md", "generated": true, "harvested": "2026-08-05", "id": "diethyl-ketone", "pel_mgm3": "705", "pel_ppm": "200", "source_quote": "96220 | | Diethyl ketone | 200 | 705 | | 300 | 1057", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "stel_mgm3": "1057", "stel_ppm": "300", "substance": "Diethyl ketone", "title": "Diethyl ketone \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Diethyl phthalate\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Diethyl phthalate\n\n**CAS No.:** 84-66-2\n\n> CAS No. 84-66-2\n\n**NIOSH REL (mg/m\u00b3):** TWA 5\n\n> NIOSH REL TWA 5 mg/m3\n\nSource: \n", "cas_number": "84-66-2", "file": "diethyl-phthalate-2.md", "generated": true, "harvested": "2026-09-08", "id": "diethyl-phthalate-2", "quote_cas_number": "CAS No. 84-66-2", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Diethyl phthalate", "rel_mgm3": "TWA 5", "source_quote": "NIOSH REL TWA 5 mg/m3", "sources": ["https://www.cdc.gov/niosh/npg/npgd0213.html"], "stale_after": "2027-09-08", "substance": "Diethyl phthalate", "title": "Diethyl phthalate \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Diethyl phthalate\n\n**CAS No.:** 84662\n\n**PEL (mg/m\u00b3):** 5\n\n> 84662 | | Diethyl phthalate | -- | 5\n\nSource: \n", "cas_number": "84662", "file": "diethyl-phthalate.md", "generated": true, "harvested": "2026-08-05", "id": "diethyl-phthalate", "pel_mgm3": "5", "source_quote": "84662 | | Diethyl phthalate | -- | 5", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Diethyl phthalate", "title": "Diethyl phthalate \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Diethylamine\n\n**CAS No.:** 109897\n\n**PEL (ppm):** 5\n\n**PEL (mg/m\u00b3):** 15\n\n**Ceiling:** C\n\n> 109897 | S | Diethylamine | 5 | 15 | C\n\nSource: \n", "cas_number": "109897", "ceiling": "C", "file": "diethylamine-2.md", "generated": true, "harvested": "2026-08-05", "id": "diethylamine-2", "pel_mgm3": "15", "pel_ppm": "5", "source_quote": "109897 | S | Diethylamine | 5 | 15 | C", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Diethylamine", "title": "Diethylamine \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Diethylamine\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Diethylamine\n\n**CAS No.:** 109-89-7\n\n> CAS No. 109-89-7\n\n**NIOSH REL (ppm):** TWA 10\n\n**NIOSH REL (mg/m\u00b3):** 30\n\n> NIOSH REL TWA 10 ppm (30 mg/m3) ST 25 ppm (75 mg/m3)\n\nSource: \n", "cas_number": "109-89-7", "file": "diethylamine-3.md", "generated": true, "harvested": "2026-09-08", "id": "diethylamine-3", "quote_cas_number": "CAS No. 109-89-7", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Diethylamine", "rel_mgm3": "30", "rel_ppm": "TWA 10", "source_quote": "NIOSH REL TWA 10 ppm (30 mg/m3) ST 25 ppm (75 mg/m3)", "sources": ["https://www.cdc.gov/niosh/npg/npgd0209.html"], "stale_after": "2027-09-08", "substance": "Diethylamine", "title": "Diethylamine \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Diethylamine\n\n**CAS No.:** 109-89-7\n\n**PEL (ppm):** 25\n\n**PEL (mg/m\u00b3):** 75\n\n> Diethylamine | 109-89-7 | 25 | 75 | - |\n\nSource: \n", "cas_number": "109-89-7", "file": "diethylamine.md", "generated": true, "harvested": "2026-08-05", "id": "diethylamine", "pel_mgm3": "75", "pel_ppm": "25", "source_quote": "Diethylamine | 109-89-7 | 25 | 75 | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Diethylamine", "title": "Diethylamine \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Diethylene glycol diethyl ether, Ethyl diglyme\n\n**CAS No.:** 112367\n\n**PEL (ppm):** 5\n\n**PEL (mg/m\u00b3):** 33\n\n> 112367 | S | Diethylene glycol diethyl ether, Ethyl diglyme | 5 | 33\n\nSource: \n", "cas_number": "112367", "file": "diethylene-glycol-diethyl-ether-ethyl-diglyme.md", "generated": true, "harvested": "2026-08-05", "id": "diethylene-glycol-diethyl-ether-ethyl-diglyme", "pel_mgm3": "33", "pel_ppm": "5", "source_quote": "112367 | S | Diethylene glycol diethyl ether, Ethyl diglyme | 5 | 33", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Diethylene glycol diethyl ether, Ethyl diglyme", "title": "Diethylene glycol diethyl ether, Ethyl diglyme \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Diethylene glycol dimethyl ether, Diglyme\n\n**CAS No.:** 111966\n\n**PEL (ppm):** 1\n\n**PEL (mg/m\u00b3):** 5.5\n\n**STEL (ppm):** 5\n\n**STEL (mg/m\u00b3):** 27\n\n> 111966 | S | Diethylene glycol dimethyl ether, Diglyme | 1 | 5.5 | | 5 | 27\n\nSource: \n", "cas_number": "111966", "file": "diethylene-glycol-dimethyl-ether-diglyme.md", "generated": true, "harvested": "2026-08-05", "id": "diethylene-glycol-dimethyl-ether-diglyme", "pel_mgm3": "5.5", "pel_ppm": "1", "source_quote": "111966 | S | Diethylene glycol dimethyl ether, Diglyme | 1 | 5.5 | | 5 | 27", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "stel_mgm3": "27", "stel_ppm": "5", "substance": "Diethylene glycol dimethyl ether, Diglyme", "title": "Diethylene glycol dimethyl ether, Diglyme \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Diethylenetriamine\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Diethylenetriamine\n\n**CAS No.:** 111-40-0\n\n> CAS No. 111-40-0\n\n**NIOSH REL (ppm):** TWA 1\n\n**NIOSH REL (mg/m\u00b3):** 4\n\n> NIOSH REL TWA 1 ppm (4 mg/m3) [skin]\n\nSource: \n", "cas_number": "111-40-0", "file": "diethylenetriamine.md", "generated": true, "harvested": "2026-09-08", "id": "diethylenetriamine", "quote_cas_number": "CAS No. 111-40-0", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Diethylenetriamine", "rel_mgm3": "4", "rel_ppm": "TWA 1", "source_quote": "NIOSH REL TWA 1 ppm (4 mg/m3) [skin]", "sources": ["https://www.cdc.gov/niosh/npg/npgd0211.html"], "stale_after": "2027-09-08", "substance": "Diethylenetriamine", "title": "Diethylenetriamine \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Difluorodibromomethane\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Difluorodibromomethane\n\n**CAS No.:** 75-61-6\n\n> CAS No. 75-61-6\n\n**NIOSH REL (ppm):** TWA 100\n\n**NIOSH REL (mg/m\u00b3):** 860\n\n> NIOSH REL TWA 100 ppm (860 mg/m3)\n\nSource: \n", "cas_number": "75-61-6", "file": "difluorodibromomethane-2.md", "generated": true, "harvested": "2026-09-08", "id": "difluorodibromomethane-2", "quote_cas_number": "CAS No. 75-61-6", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Difluorodibromomethane", "rel_mgm3": "860", "rel_ppm": "TWA 100", "source_quote": "NIOSH REL TWA 100 ppm (860 mg/m3)", "sources": ["https://www.cdc.gov/niosh/npg/npgd0214.html"], "stale_after": "2027-09-08", "substance": "Difluorodibromomethane", "title": "Difluorodibromomethane \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Difluorodibromomethane; dibromodifluoromethane\n\n**CAS No.:** 75616\n\n**PEL (ppm):** 100\n\n**PEL (mg/m\u00b3):** 860\n\n> 75616 | | Difluorodibromomethane; dibromodifluoromethane | 100 | 860\n\nSource: \n", "cas_number": "75616", "file": "difluorodibromomethane-dibromodifluoromethane.md", "generated": true, "harvested": "2026-08-05", "id": "difluorodibromomethane-dibromodifluoromethane", "pel_mgm3": "860", "pel_ppm": "100", "source_quote": "75616 | | Difluorodibromomethane; dibromodifluoromethane | 100 | 860", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Difluorodibromomethane; dibromodifluoromethane", "title": "Difluorodibromomethane; dibromodifluoromethane \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Difluorodibromomethane\n\n**CAS No.:** 75-61-6\n\n**PEL (ppm):** 100\n\n**PEL (mg/m\u00b3):** 860\n\n> Difluorodibromomethane | 75-61-6 | 100 | 860 | - |\n\nSource: \n", "cas_number": "75-61-6", "file": "difluorodibromomethane.md", "generated": true, "harvested": "2026-08-05", "id": "difluorodibromomethane", "pel_mgm3": "860", "pel_ppm": "100", "source_quote": "Difluorodibromomethane | 75-61-6 | 100 | 860 | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Difluorodibromomethane", "title": "Difluorodibromomethane \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Diglycidyl ether; DGE; bis(2,3-epoxypropyl) ether\n\n**CAS No.:** 2238075\n\n**PEL (ppm):** 0.1\n\n**PEL (mg/m\u00b3):** 0.5\n\n> 2238075 | | Diglycidyl ether; DGE; bis(2,3-epoxypropyl) ether | 0.1 | 0.5\n\nSource: \n", "cas_number": "2238075", "file": "diglycidyl-ether-dge-bis-2-3-epoxypropyl-ether.md", "generated": true, "harvested": "2026-08-05", "id": "diglycidyl-ether-dge-bis-2-3-epoxypropyl-ether", "pel_mgm3": "0.5", "pel_ppm": "0.1", "source_quote": "2238075 | | Diglycidyl ether; DGE; bis(2,3-epoxypropyl) ether | 0.1 | 0.5", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Diglycidyl ether; DGE; bis(2,3-epoxypropyl) ether", "title": "Diglycidyl ether; DGE; bis(2,3-epoxypropyl) ether \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Diglycidyl ether (DGE)\n\n**CAS No.:** 2238-07-5\n\n**PEL (ppm):** (C)0.5\n\n**PEL (mg/m\u00b3):** (C)2.8\n\n> Diglycidyl ether (DGE) | 2238-07-5 | (C)0.5 | (C)2.8 | - |\n\nSource: \n", "cas_number": "2238-07-5", "file": "diglycidyl-ether-dge.md", "generated": true, "harvested": "2026-08-05", "id": "diglycidyl-ether-dge", "pel_mgm3": "(C)2.8", "pel_ppm": "(C)0.5", "source_quote": "Diglycidyl ether (DGE) | 2238-07-5 | (C)0.5 | (C)2.8 | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Diglycidyl ether (DGE)", "title": "Diglycidyl ether (DGE) \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Diglycidyl ether\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Diglycidyl ether\n\n**CAS No.:** 2238-07-5\n\n> CAS No. 2238-07-5\n\n**NIOSH REL (ppm):** TWA 0.1\n\n**NIOSH REL (mg/m\u00b3):** 0.5\n\n> NIOSH REL Ca TWA 0.1 ppm (0.5 mg/m3)\n\nSource: \n", "cas_number": "2238-07-5", "file": "diglycidyl-ether.md", "generated": true, "harvested": "2026-09-08", "id": "diglycidyl-ether", "quote_cas_number": "CAS No. 2238-07-5", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Diglycidyl ether", "rel_mgm3": "0.5", "rel_ppm": "TWA 0.1", "source_quote": "NIOSH REL Ca TWA 0.1 ppm (0.5 mg/m3)", "sources": ["https://www.cdc.gov/niosh/npg/npgd0215.html"], "stale_after": "2027-09-08", "substance": "Diglycidyl ether", "title": "Diglycidyl ether \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Diisobutyl ketone; 2,6-dimethyl-4-heptanone\n\n**CAS No.:** 108838\n\n**PEL (ppm):** 25\n\n**PEL (mg/m\u00b3):** 150\n\n> 108838 | | Diisobutyl ketone; 2,6-dimethyl-4-heptanone | 25 | 150\n\nSource: \n", "cas_number": "108838", "file": "diisobutyl-ketone-2-6-dimethyl-4-heptanone.md", "generated": true, "harvested": "2026-08-05", "id": "diisobutyl-ketone-2-6-dimethyl-4-heptanone", "pel_mgm3": "150", "pel_ppm": "25", "source_quote": "108838 | | Diisobutyl ketone; 2,6-dimethyl-4-heptanone | 25 | 150", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Diisobutyl ketone; 2,6-dimethyl-4-heptanone", "title": "Diisobutyl ketone; 2,6-dimethyl-4-heptanone \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Diisobutyl ketone\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Diisobutyl ketone\n\n**CAS No.:** 108-83-8\n\n> CAS No. 108-83-8\n\n**NIOSH REL (ppm):** TWA 25\n\n**NIOSH REL (mg/m\u00b3):** 150\n\n> NIOSH REL TWA 25 ppm (150 mg/m3)\n\nSource: \n", "cas_number": "108-83-8", "file": "diisobutyl-ketone-2.md", "generated": true, "harvested": "2026-09-08", "id": "diisobutyl-ketone-2", "quote_cas_number": "CAS No. 108-83-8", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Diisobutyl ketone", "rel_mgm3": "150", "rel_ppm": "TWA 25", "source_quote": "NIOSH REL TWA 25 ppm (150 mg/m3)", "sources": ["https://www.cdc.gov/niosh/npg/npgd0216.html"], "stale_after": "2027-09-08", "substance": "Diisobutyl ketone", "title": "Diisobutyl ketone \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Diisobutyl ketone\n\n**CAS No.:** 108-83-8\n\n**PEL (ppm):** 50\n\n**PEL (mg/m\u00b3):** 290\n\n> Diisobutyl ketone | 108-83-8 | 50 | 290 | - |\n\nSource: \n", "cas_number": "108-83-8", "file": "diisobutyl-ketone.md", "generated": true, "harvested": "2026-08-05", "id": "diisobutyl-ketone", "pel_mgm3": "290", "pel_ppm": "50", "source_quote": "Diisobutyl ketone | 108-83-8 | 50 | 290 | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Diisobutyl ketone", "title": "Diisobutyl ketone \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Diisopropyl ether; see Isopryl ether\n\n**CAS No.:** 108203\n\n> 108203 | | Diisopropyl ether; see Isopryl ether\n\nSource: \n", "cas_number": "108203", "file": "diisopropyl-ether-see-isopryl-ether.md", "generated": true, "harvested": "2026-08-05", "id": "diisopropyl-ether-see-isopryl-ether", "source_quote": "108203 | | Diisopropyl ether; see Isopryl ether", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Diisopropyl ether; see Isopryl ether", "title": "Diisopropyl ether; see Isopryl ether \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Diisopropylamine\n\n**CAS No.:** 108189\n\n**PEL (ppm):** 5\n\n**PEL (mg/m\u00b3):** 20\n\n> 108189 | S | Diisopropylamine | 5 | 20\n\nSource: \n", "cas_number": "108189", "file": "diisopropylamine-2.md", "generated": true, "harvested": "2026-08-05", "id": "diisopropylamine-2", "pel_mgm3": "20", "pel_ppm": "5", "source_quote": "108189 | S | Diisopropylamine | 5 | 20", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Diisopropylamine", "title": "Diisopropylamine \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Diisopropylamine\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Diisopropylamine\n\n**CAS No.:** 108-18-9\n\n> CAS No. 108-18-9\n\n**NIOSH REL (ppm):** TWA 5\n\n**NIOSH REL (mg/m\u00b3):** 20\n\n> NIOSH REL TWA 5 ppm (20 mg/m3) [skin]\n\nSource: \n", "cas_number": "108-18-9", "file": "diisopropylamine-3.md", "generated": true, "harvested": "2026-09-08", "id": "diisopropylamine-3", "quote_cas_number": "CAS No. 108-18-9", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Diisopropylamine", "rel_mgm3": "20", "rel_ppm": "TWA 5", "source_quote": "NIOSH REL TWA 5 ppm (20 mg/m3) [skin]", "sources": ["https://www.cdc.gov/niosh/npg/npgd0217.html"], "stale_after": "2027-09-08", "substance": "Diisopropylamine", "title": "Diisopropylamine \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Diisopropylamine\n\n**CAS No.:** 108-18-9\n\n**PEL (ppm):** 5\n\n**PEL (mg/m\u00b3):** 20\n\n> Diisopropylamine | 108-18-9 | 5 | 20 | X |\n\nSource: \n", "cas_number": "108-18-9", "file": "diisopropylamine.md", "generated": true, "harvested": "2026-08-05", "id": "diisopropylamine", "pel_mgm3": "20", "pel_ppm": "5", "source_quote": "Diisopropylamine | 108-18-9 | 5 | 20 | X |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Diisopropylamine", "title": "Diisopropylamine \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Dimethoxymethane; see Methylal\n\n**CAS No.:** 109875\n\n> 109875 | | Dimethoxymethane; see Methylal\n\nSource: \n", "cas_number": "109875", "file": "dimethoxymethane-see-methylal.md", "generated": true, "harvested": "2026-08-05", "id": "dimethoxymethane-see-methylal", "source_quote": "109875 | | Dimethoxymethane; see Methylal", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Dimethoxymethane; see Methylal", "title": "Dimethoxymethane; see Methylal \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Dimethyl-1,2-dibromo-2,2-dichlorethyl phosphate\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Dimethyl-1,2-dibromo-2,2-dichlorethyl phosphate\n\n**CAS No.:** 300-76-5\n\n> CAS No. 300-76-5\n\n**NIOSH REL (mg/m\u00b3):** TWA 3\n\n> NIOSH REL TWA 3 mg/m3 [skin]\n\nSource: \n", "cas_number": "300-76-5", "file": "dimethyl-1-2-dibromo-2-2-dichlorethyl-phosphate.md", "generated": true, "harvested": "2026-09-08", "id": "dimethyl-1-2-dibromo-2-2-dichlorethyl-phosphate", "quote_cas_number": "CAS No. 300-76-5", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Dimethyl-1,2-dibromo-2,2-dichlorethyl phosphate", "rel_mgm3": "TWA 3", "source_quote": "NIOSH REL TWA 3 mg/m3 [skin]", "sources": ["https://www.cdc.gov/niosh/npg/npgd0225.html"], "stale_after": "2027-09-08", "substance": "Dimethyl-1,2-dibromo-2,2-dichlorethyl phosphate", "title": "Dimethyl-1,2-dibromo-2,2-dichlorethyl phosphate \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Dimethyl-1,2-dibromo-2,2-dichloroethyl phosphate\n\n**CAS No.:** 300-76-5\n\n**PEL (mg/m\u00b3):** 3\n\n> Dimethyl-1,2-dibromo-2,2-dichloroethyl phosphate | 300-76-5 | - | 3 | - |\n\nSource: \n", "cas_number": "300-76-5", "file": "dimethyl-1-2-dibromo-2-2-dichloroethyl-phosphate.md", "generated": true, "harvested": "2026-08-05", "id": "dimethyl-1-2-dibromo-2-2-dichloroethyl-phosphate", "pel_mgm3": "3", "source_quote": "Dimethyl-1,2-dibromo-2,2-dichloroethyl phosphate | 300-76-5 | - | 3 | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Dimethyl-1,2-dibromo-2,2-dichloroethyl phosphate", "title": "Dimethyl-1,2-dibromo-2,2-dichloroethyl phosphate \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Dimethyl acetamide\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Dimethyl acetamide\n\n**CAS No.:** 127-19-5\n\n> CAS No. 127-19-5\n\n**NIOSH REL (ppm):** TWA 10\n\n**NIOSH REL (mg/m\u00b3):** 35\n\n> NIOSH REL TWA 10 ppm (35 mg/m3) [skin]\n\nSource: \n", "cas_number": "127-19-5", "file": "dimethyl-acetamide-2.md", "generated": true, "harvested": "2026-09-08", "id": "dimethyl-acetamide-2", "quote_cas_number": "CAS No. 127-19-5", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Dimethyl acetamide", "rel_mgm3": "35", "rel_ppm": "TWA 10", "source_quote": "NIOSH REL TWA 10 ppm (35 mg/m3) [skin]", "sources": ["https://www.cdc.gov/niosh/npg/npgd0218.html"], "stale_after": "2027-09-08", "substance": "Dimethyl acetamide", "title": "Dimethyl acetamide \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Dimethyl acetamide\n\n**CAS No.:** 127-19-5\n\n**PEL (ppm):** 10\n\n**PEL (mg/m\u00b3):** 35\n\n> Dimethyl acetamide | 127-19-5 | 10 | 35 | X |\n\nSource: \n", "cas_number": "127-19-5", "file": "dimethyl-acetamide.md", "generated": true, "harvested": "2026-08-05", "id": "dimethyl-acetamide", "pel_mgm3": "35", "pel_ppm": "10", "source_quote": "Dimethyl acetamide | 127-19-5 | 10 | 35 | X |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Dimethyl acetamide", "title": "Dimethyl acetamide \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Dimethyl carbamoyl chloride\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Dimethyl carbamoyl chloride\n\n**CAS No.:** 79-44-7\n\n> CAS No. 79-44-7\n\n**NIOSH REL, as stated:** Ca See Appendix A\n\n> NIOSH REL Ca See Appendix A\n\nSource: \n", "cas_number": "79-44-7", "file": "dimethyl-carbamoyl-chloride.md", "generated": true, "harvested": "2026-09-08", "id": "dimethyl-carbamoyl-chloride", "quote_cas_number": "CAS No. 79-44-7", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Dimethyl carbamoyl chloride", "rel_statement": "Ca See Appendix A", "source_quote": "NIOSH REL Ca See Appendix A", "sources": ["https://www.cdc.gov/niosh/npg/npgd0224.html"], "stale_after": "2027-09-08", "substance": "Dimethyl carbamoyl chloride", "title": "Dimethyl carbamoyl chloride \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Dimethyl ketone; see Acetone\n\n**CAS No.:** 67641\n\n> 67641 | | Dimethyl ketone; see Acetone\n\nSource: \n", "cas_number": "67641", "file": "dimethyl-ketone-see-acetone.md", "generated": true, "harvested": "2026-08-05", "id": "dimethyl-ketone-see-acetone", "source_quote": "67641 | | Dimethyl ketone; see Acetone", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Dimethyl ketone; see Acetone", "title": "Dimethyl ketone; see Acetone \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Dimethyl phthalate\n\n**CAS No.:** 131113\n\n**PEL (mg/m\u00b3):** 5\n\n> 131113 | | Dimethyl phthalate | -- | 5\n\nSource: \n", "cas_number": "131113", "file": "dimethyl-phthalate.md", "generated": true, "harvested": "2026-08-05", "id": "dimethyl-phthalate", "pel_mgm3": "5", "source_quote": "131113 | | Dimethyl phthalate | -- | 5", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Dimethyl phthalate", "title": "Dimethyl phthalate \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Dimethyl sulfate\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Dimethyl sulfate\n\n**CAS No.:** 77-78-1\n\n> CAS No. 77-78-1\n\n**NIOSH REL (ppm):** TWA 0.1\n\n**NIOSH REL (mg/m\u00b3):** 0.5\n\n> NIOSH REL Ca TWA 0.1 ppm (0.5 mg/m3) [skin]\n\nSource: \n", "cas_number": "77-78-1", "file": "dimethyl-sulfate-2.md", "generated": true, "harvested": "2026-09-08", "id": "dimethyl-sulfate-2", "quote_cas_number": "CAS No. 77-78-1", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Dimethyl sulfate", "rel_mgm3": "0.5", "rel_ppm": "TWA 0.1", "source_quote": "NIOSH REL Ca TWA 0.1 ppm (0.5 mg/m3) [skin]", "sources": ["https://www.cdc.gov/niosh/npg/npgd0229.html"], "stale_after": "2027-09-08", "substance": "Dimethyl sulfate", "title": "Dimethyl sulfate \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Dimethyl sulfate; methyl sulfate\n\n**CAS No.:** 77781\n\n**PEL (ppm):** 0.1\n\n**PEL (mg/m\u00b3):** 0.5\n\n> 77781 | S | Dimethyl sulfate; methyl sulfate | 0.1 | 0.5\n\nSource: \n", "cas_number": "77781", "file": "dimethyl-sulfate-methyl-sulfate.md", "generated": true, "harvested": "2026-08-05", "id": "dimethyl-sulfate-methyl-sulfate", "pel_mgm3": "0.5", "pel_ppm": "0.1", "source_quote": "77781 | S | Dimethyl sulfate; methyl sulfate | 0.1 | 0.5", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Dimethyl sulfate; methyl sulfate", "title": "Dimethyl sulfate; methyl sulfate \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Dimethyl sulfate\n\n**CAS No.:** 77-78-1\n\n**PEL (ppm):** 1\n\n**PEL (mg/m\u00b3):** 5\n\n> Dimethyl sulfate | 77-78-1 | 1 | 5 | X |\n\nSource: \n", "cas_number": "77-78-1", "file": "dimethyl-sulfate.md", "generated": true, "harvested": "2026-08-05", "id": "dimethyl-sulfate", "pel_mgm3": "5", "pel_ppm": "1", "source_quote": "Dimethyl sulfate | 77-78-1 | 1 | 5 | X |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Dimethyl sulfate", "title": "Dimethyl sulfate \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Dimethylacetamide\n\n**CAS No.:** 127195\n\n**PEL (ppm):** 10\n\n**PEL (mg/m\u00b3):** 35\n\n> 127195 | S | Dimethylacetamide | 10 | 35\n\nSource: \n", "cas_number": "127195", "file": "dimethylacetamide.md", "generated": true, "harvested": "2026-08-05", "id": "dimethylacetamide", "pel_mgm3": "35", "pel_ppm": "10", "source_quote": "127195 | S | Dimethylacetamide | 10 | 35", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Dimethylacetamide", "title": "Dimethylacetamide \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Dimethylamine\n\n**CAS No.:** 124403\n\n**PEL (ppm):** 5\n\n**PEL (mg/m\u00b3):** 9.2\n\n**STEL (ppm):** 15\n\n**STEL (mg/m\u00b3):** 27.6\n\n> 124403 | | Dimethylamine | 5 | 9.2 | | 15 | 27.6\n\nSource: \n", "cas_number": "124403", "file": "dimethylamine-2.md", "generated": true, "harvested": "2026-08-05", "id": "dimethylamine-2", "pel_mgm3": "9.2", "pel_ppm": "5", "source_quote": "124403 | | Dimethylamine | 5 | 9.2 | | 15 | 27.6", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "stel_mgm3": "27.6", "stel_ppm": "15", "substance": "Dimethylamine", "title": "Dimethylamine \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Dimethylamine\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Dimethylamine\n\n**CAS No.:** 124-40-3\n\n> CAS No. 124-40-3\n\n**NIOSH REL (ppm):** TWA 10\n\n**NIOSH REL (mg/m\u00b3):** 18\n\n> NIOSH REL TWA 10 ppm (18 mg/m3)\n\nSource: \n", "cas_number": "124-40-3", "file": "dimethylamine-3.md", "generated": true, "harvested": "2026-09-08", "id": "dimethylamine-3", "quote_cas_number": "CAS No. 124-40-3", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Dimethylamine", "rel_mgm3": "18", "rel_ppm": "TWA 10", "source_quote": "NIOSH REL TWA 10 ppm (18 mg/m3)", "sources": ["https://www.cdc.gov/niosh/npg/npgd0219.html"], "stale_after": "2027-09-08", "substance": "Dimethylamine", "title": "Dimethylamine \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Dimethylamine\n\n**CAS No.:** 124-40-3\n\n**PEL (ppm):** 10\n\n**PEL (mg/m\u00b3):** 18\n\n> Dimethylamine | 124-40-3 | 10 | 18 | - |\n\nSource: \n", "cas_number": "124-40-3", "file": "dimethylamine.md", "generated": true, "harvested": "2026-08-05", "id": "dimethylamine", "pel_mgm3": "18", "pel_ppm": "10", "source_quote": "Dimethylamine | 124-40-3 | 10 | 18 | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Dimethylamine", "title": "Dimethylamine \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Dimethylaminobenzene; see Xylidene\n\n**CAS No.:** 1300738\n\n> 1300738 | | Dimethylaminobenzene; see Xylidene\n\nSource: \n", "cas_number": "1300738", "file": "dimethylaminobenzene-see-xylidene.md", "generated": true, "harvested": "2026-08-05", "id": "dimethylaminobenzene-see-xylidene", "source_quote": "1300738 | | Dimethylaminobenzene; see Xylidene", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Dimethylaminobenzene; see Xylidene", "title": "Dimethylaminobenzene; see Xylidene \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Dimethylaminopropionitrile\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Dimethylaminopropionitrile\n\n**CAS No.:** 1738-25-6\n\n> CAS No. 1738-25-6\n\n**NIOSH REL, as stated:** See Appendix C (NIAX\u00ae Catalyst ESN)\n\n> NIOSH REL See Appendix C (NIAX\u00ae Catalyst ESN)\n\nSource: \n", "cas_number": "1738-25-6", "file": "dimethylaminopropionitrile.md", "generated": true, "harvested": "2026-09-08", "id": "dimethylaminopropionitrile", "quote_cas_number": "CAS No. 1738-25-6", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Dimethylaminopropionitrile", "rel_statement": "See Appendix C (NIAX\u00ae Catalyst ESN)", "source_quote": "NIOSH REL See Appendix C (NIAX\u00ae Catalyst ESN)", "sources": ["https://www.cdc.gov/niosh/npg/npgd0222.html"], "stale_after": "2027-09-08", "substance": "Dimethylaminopropionitrile", "title": "Dimethylaminopropionitrile \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Dimethylaniline (N,N-Dimethylaniline)\n\n**CAS No.:** 121-69-7\n\n**PEL (ppm):** 5\n\n**PEL (mg/m\u00b3):** 25\n\n> Dimethylaniline (N,N-Dimethylaniline) | 121-69-7 | 5 | 25 | X |\n\nSource: \n", "cas_number": "121-69-7", "file": "dimethylaniline-n-n-dimethylaniline.md", "generated": true, "harvested": "2026-08-05", "id": "dimethylaniline-n-n-dimethylaniline", "pel_mgm3": "25", "pel_ppm": "5", "source_quote": "Dimethylaniline (N,N-Dimethylaniline) | 121-69-7 | 5 | 25 | X |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Dimethylaniline (N,N-Dimethylaniline)", "title": "Dimethylaniline (N,N-Dimethylaniline) \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Dimethylbenzene; see Xylene\n\n**CAS No.:** 1330207\n\n> 1330207 | | Dimethylbenzene; see Xylene\n\nSource: \n", "cas_number": "1330207", "file": "dimethylbenzene-see-xylene.md", "generated": true, "harvested": "2026-08-05", "id": "dimethylbenzene-see-xylene", "source_quote": "1330207 | | Dimethylbenzene; see Xylene", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Dimethylbenzene; see Xylene", "title": "Dimethylbenzene; see Xylene \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Dimethylethoxysilane\n\n**CAS No.:** 14857342\n\n**PEL (ppm):** 0.5\n\n**PEL (mg/m\u00b3):** 2.1\n\n**STEL (ppm):** 1.5\n\n**STEL (mg/m\u00b3):** 6.4\n\n> 14857342 | | Dimethylethoxysilane | 0.5 | 2.1 | | 1.5 | 6.4\n\nSource: \n", "cas_number": "14857342", "file": "dimethylethoxysilane.md", "generated": true, "harvested": "2026-08-05", "id": "dimethylethoxysilane", "pel_mgm3": "2.1", "pel_ppm": "0.5", "source_quote": "14857342 | | Dimethylethoxysilane | 0.5 | 2.1 | | 1.5 | 6.4", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "stel_mgm3": "6.4", "stel_ppm": "1.5", "substance": "Dimethylethoxysilane", "title": "Dimethylethoxysilane \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Dimethylformamide\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Dimethylformamide\n\n**CAS No.:** 68-12-2\n\n> CAS No. 68-12-2\n\n**NIOSH REL (ppm):** TWA 10\n\n**NIOSH REL (mg/m\u00b3):** 30\n\n> NIOSH REL TWA 10 ppm (30 mg/m3) [skin]\n\nSource: \n", "cas_number": "68-12-2", "file": "dimethylformamide-2.md", "generated": true, "harvested": "2026-09-08", "id": "dimethylformamide-2", "quote_cas_number": "CAS No. 68-12-2", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Dimethylformamide", "rel_mgm3": "30", "rel_ppm": "TWA 10", "source_quote": "NIOSH REL TWA 10 ppm (30 mg/m3) [skin]", "sources": ["https://www.cdc.gov/niosh/npg/npgd0226.html"], "stale_after": "2027-09-08", "substance": "Dimethylformamide", "title": "Dimethylformamide \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Dimethylformamide; DMF\n\n**CAS No.:** 68122\n\n**PEL (ppm):** 10\n\n**PEL (mg/m\u00b3):** 30\n\n> 68122 | S | Dimethylformamide; DMF | 10 | 30\n\nSource: \n", "cas_number": "68122", "file": "dimethylformamide-dmf.md", "generated": true, "harvested": "2026-08-05", "id": "dimethylformamide-dmf", "pel_mgm3": "30", "pel_ppm": "10", "source_quote": "68122 | S | Dimethylformamide; DMF | 10 | 30", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Dimethylformamide; DMF", "title": "Dimethylformamide; DMF \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Dimethylformamide\n\n**CAS No.:** 68-12-2\n\n**PEL (ppm):** 10\n\n**PEL (mg/m\u00b3):** 30\n\n> Dimethylformamide | 68-12-2 | 10 | 30 | X |\n\nSource: \n", "cas_number": "68-12-2", "file": "dimethylformamide.md", "generated": true, "harvested": "2026-08-05", "id": "dimethylformamide", "pel_mgm3": "30", "pel_ppm": "10", "source_quote": "Dimethylformamide | 68-12-2 | 10 | 30 | X |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Dimethylformamide", "title": "Dimethylformamide \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Dimethylphthalate\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Dimethylphthalate\n\n**CAS No.:** 131-11-3\n\n> CAS No. 131-11-3\n\n**NIOSH REL (mg/m\u00b3):** TWA 5\n\n> NIOSH REL TWA 5 mg/m3\n\nSource: \n", "cas_number": "131-11-3", "file": "dimethylphthalate-2.md", "generated": true, "harvested": "2026-09-08", "id": "dimethylphthalate-2", "quote_cas_number": "CAS No. 131-11-3", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Dimethylphthalate", "rel_mgm3": "TWA 5", "source_quote": "NIOSH REL TWA 5 mg/m3", "sources": ["https://www.cdc.gov/niosh/npg/npgd0228.html"], "stale_after": "2027-09-08", "substance": "Dimethylphthalate", "title": "Dimethylphthalate \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Dimethylphthalate\n\n**CAS No.:** 131-11-3\n\n**PEL (mg/m\u00b3):** 5\n\n> Dimethylphthalate | 131-11-3 | - | 5 | - |\n\nSource: \n", "cas_number": "131-11-3", "file": "dimethylphthalate.md", "generated": true, "harvested": "2026-08-05", "id": "dimethylphthalate", "pel_mgm3": "5", "source_quote": "Dimethylphthalate | 131-11-3 | - | 5 | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Dimethylphthalate", "title": "Dimethylphthalate \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Dinitolmide; 3,5-Dinitro-o-toluamide\n\n**CAS No.:** 148016\n\n**PEL (mg/m\u00b3):** 5\n\n> 148016 | | Dinitolmide; 3,5-Dinitro-o-toluamide | -- | 5\n\nSource: \n", "cas_number": "148016", "file": "dinitolmide-3-5-dinitro-o-toluamide.md", "generated": true, "harvested": "2026-08-05", "id": "dinitolmide-3-5-dinitro-o-toluamide", "pel_mgm3": "5", "source_quote": "148016 | | Dinitolmide; 3,5-Dinitro-o-toluamide | -- | 5", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Dinitolmide; 3,5-Dinitro-o-toluamide", "title": "Dinitolmide; 3,5-Dinitro-o-toluamide \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Dinitolmide\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Dinitolmide\n\n**CAS No.:** 148-01-6\n\n> CAS No. 148-01-6\n\n**NIOSH REL (mg/m\u00b3):** TWA 5\n\n> NIOSH REL TWA 5 mg/m3\n\nSource: \n", "cas_number": "148-01-6", "file": "dinitolmide.md", "generated": true, "harvested": "2026-09-08", "id": "dinitolmide", "quote_cas_number": "CAS No. 148-01-6", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Dinitolmide", "rel_mgm3": "TWA 5", "source_quote": "NIOSH REL TWA 5 mg/m3", "sources": ["https://www.cdc.gov/niosh/npg/npgd0230.html"], "stale_after": "2027-09-08", "substance": "Dinitolmide", "title": "Dinitolmide \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Dinitro-o-cresol\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Dinitro-o-cresol\n\n**CAS No.:** 534-52-1\n\n> CAS No. 534-52-1\n\n**NIOSH REL (mg/m\u00b3):** TWA 0.2\n\n> NIOSH REL TWA 0.2 mg/m3 [skin]\n\nSource: \n", "cas_number": "534-52-1", "file": "dinitro-o-cresol-2.md", "generated": true, "harvested": "2026-09-08", "id": "dinitro-o-cresol-2", "quote_cas_number": "CAS No. 534-52-1", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Dinitro-o-cresol", "rel_mgm3": "TWA 0.2", "source_quote": "NIOSH REL TWA 0.2 mg/m3 [skin]", "sources": ["https://www.cdc.gov/niosh/npg/npgd0234.html"], "stale_after": "2027-09-08", "substance": "Dinitro-o-cresol", "title": "Dinitro-o-cresol \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Dinitro-o-cresol\n\n**CAS No.:** 534-52-1\n\n**PEL (mg/m\u00b3):** 0.2\n\n> Dinitro-o-cresol | 534-52-1 | - | 0.2 | X |\n\nSource: \n", "cas_number": "534-52-1", "file": "dinitro-o-cresol.md", "generated": true, "harvested": "2026-08-05", "id": "dinitro-o-cresol", "pel_mgm3": "0.2", "source_quote": "Dinitro-o-cresol | 534-52-1 | - | 0.2 | X |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Dinitro-o-cresol", "title": "Dinitro-o-cresol \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Dinitrotoluene\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Dinitrotoluene\n\n**CAS No.:** 25321-14-6\n\n> CAS No. 25321-14-6\n\n**NIOSH REL (mg/m\u00b3):** TWA 1.5\n\n> NIOSH REL Ca TWA 1.5 mg/m3 [skin]\n\nSource: \n", "cas_number": "25321-14-6", "file": "dinitrotoluene-2.md", "generated": true, "harvested": "2026-09-08", "id": "dinitrotoluene-2", "quote_cas_number": "CAS No. 25321-14-6", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Dinitrotoluene", "rel_mgm3": "TWA 1.5", "source_quote": "NIOSH REL Ca TWA 1.5 mg/m3 [skin]", "sources": ["https://www.cdc.gov/niosh/npg/npgd0235.html"], "stale_after": "2027-09-08", "substance": "Dinitrotoluene", "title": "Dinitrotoluene \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Dinitrotoluene\n\n**CAS No.:** 25321-14-6\n\n**PEL (mg/m\u00b3):** 1.5\n\n> Dinitrotoluene | 25321-14-6 | - | 1.5 | X |\n\nSource: \n", "cas_number": "25321-14-6", "file": "dinitrotoluene.md", "generated": true, "harvested": "2026-08-05", "id": "dinitrotoluene", "pel_mgm3": "1.5", "source_quote": "Dinitrotoluene | 25321-14-6 | - | 1.5 | X |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Dinitrotoluene", "title": "Dinitrotoluene \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Dioxane (Diethylene dioxide)\n\n**CAS No.:** 123-91-1\n\n**PEL (ppm):** 100\n\n**PEL (mg/m\u00b3):** 360\n\n> Dioxane (Diethylene dioxide) | 123-91-1 | 100 | 360 | X |\n\nSource: \n", "cas_number": "123-91-1", "file": "dioxane-diethylene-dioxide.md", "generated": true, "harvested": "2026-08-05", "id": "dioxane-diethylene-dioxide", "pel_mgm3": "360", "pel_ppm": "100", "source_quote": "Dioxane (Diethylene dioxide) | 123-91-1 | 100 | 360 | X |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Dioxane (Diethylene dioxide)", "title": "Dioxane (Diethylene dioxide) \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Dioxane\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Dioxane\n\n**CAS No.:** 123-91-1\n\n> CAS No. 123-91-1\n\n**NIOSH REL (ppm):** C 1\n\n**NIOSH REL (mg/m\u00b3):** 3.6\n\n> NIOSH REL Ca C 1 ppm (3.6 mg/m3) [30-minute]\n\nSource: \n", "cas_number": "123-91-1", "file": "dioxane.md", "generated": true, "harvested": "2026-09-08", "id": "dioxane", "quote_cas_number": "CAS No. 123-91-1", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Dioxane", "rel_mgm3": "3.6", "rel_ppm": "C 1", "source_quote": "NIOSH REL Ca C 1 ppm (3.6 mg/m3) [30-minute]", "sources": ["https://www.cdc.gov/niosh/npg/npgd0237.html"], "stale_after": "2027-09-08", "substance": "Dioxane", "title": "Dioxane \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Dioxathion\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Dioxathion\n\n**CAS No.:** 78-34-2\n\n> CAS No. 78-34-2\n\n**NIOSH REL (mg/m\u00b3):** TWA 0.2\n\n> NIOSH REL TWA 0.2 mg/m3 [skin]\n\nSource: \n", "cas_number": "78-34-2", "file": "dioxathion-2.md", "generated": true, "harvested": "2026-09-08", "id": "dioxathion-2", "quote_cas_number": "CAS No. 78-34-2", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Dioxathion", "rel_mgm3": "TWA 0.2", "source_quote": "NIOSH REL TWA 0.2 mg/m3 [skin]", "sources": ["https://www.cdc.gov/niosh/npg/npgd0238.html"], "stale_after": "2027-09-08", "substance": "Dioxathion", "title": "Dioxathion \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Dioxathion\n\n**CAS No.:** 78342\n\n**PEL (mg/m\u00b3):** 0.2\n\n> 78342 | S | Dioxathion | -- | 0.2\n\nSource: \n", "cas_number": "78342", "file": "dioxathion.md", "generated": true, "harvested": "2026-08-05", "id": "dioxathion", "pel_mgm3": "0.2", "source_quote": "78342 | S | Dioxathion | -- | 0.2", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Dioxathion", "title": "Dioxathion \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Diphenyl (Biphenyl)\n\n**CAS No.:** 92-52-4\n\n**PEL (ppm):** 0.2\n\n**PEL (mg/m\u00b3):** 1\n\n> Diphenyl (Biphenyl) | 92-52-4 | 0.2 | 1 | - |\n\nSource: \n", "cas_number": "92-52-4", "file": "diphenyl-biphenyl.md", "generated": true, "harvested": "2026-08-05", "id": "diphenyl-biphenyl", "pel_mgm3": "1", "pel_ppm": "0.2", "source_quote": "Diphenyl (Biphenyl) | 92-52-4 | 0.2 | 1 | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Diphenyl (Biphenyl)", "title": "Diphenyl (Biphenyl) \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Diphenyl; see Biphenyl\n\n**CAS No.:** 92524\n\n> 92524 | | Diphenyl; see Biphenyl\n\nSource: \n", "cas_number": "92524", "file": "diphenyl-see-biphenyl.md", "generated": true, "harvested": "2026-08-05", "id": "diphenyl-see-biphenyl", "source_quote": "92524 | | Diphenyl; see Biphenyl", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Diphenyl; see Biphenyl", "title": "Diphenyl; see Biphenyl \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Diphenyl\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Diphenyl\n\n**CAS No.:** 92-52-4\n\n> CAS No. 92-52-4\n\n**NIOSH REL (ppm):** 0.2\n\n**NIOSH REL (mg/m\u00b3):** TWA 1\n\n> NIOSH REL TWA 1 mg/m3 (0.2 ppm)\n\nSource: \n", "cas_number": "92-52-4", "file": "diphenyl.md", "generated": true, "harvested": "2026-09-08", "id": "diphenyl", "quote_cas_number": "CAS No. 92-52-4", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Diphenyl", "rel_mgm3": "TWA 1", "rel_ppm": "0.2", "source_quote": "NIOSH REL TWA 1 mg/m3 (0.2 ppm)", "sources": ["https://www.cdc.gov/niosh/npg/npgd0239.html"], "stale_after": "2027-09-08", "substance": "Diphenyl", "title": "Diphenyl \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Diphenylamine; N-phenylaniline\n\n**CAS No.:** 122394\n\n**PEL (mg/m\u00b3):** 10\n\n> 122394 | | Diphenylamine; N-phenylaniline | -- | 10\n\nSource: \n", "cas_number": "122394", "file": "diphenylamine-n-phenylaniline.md", "generated": true, "harvested": "2026-08-05", "id": "diphenylamine-n-phenylaniline", "pel_mgm3": "10", "source_quote": "122394 | | Diphenylamine; N-phenylaniline | -- | 10", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Diphenylamine; N-phenylaniline", "title": "Diphenylamine; N-phenylaniline \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Diphenylamine\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Diphenylamine\n\n**CAS No.:** 122-39-4\n\n> CAS No. 122-39-4\n\n**NIOSH REL (mg/m\u00b3):** TWA 10\n\n> NIOSH REL TWA 10 mg/m3\n\nSource: \n", "cas_number": "122-39-4", "file": "diphenylamine.md", "generated": true, "harvested": "2026-09-08", "id": "diphenylamine", "quote_cas_number": "CAS No. 122-39-4", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Diphenylamine", "rel_mgm3": "TWA 10", "source_quote": "NIOSH REL TWA 10 mg/m3", "sources": ["https://www.cdc.gov/niosh/npg/npgd0240.html"], "stale_after": "2027-09-08", "substance": "Diphenylamine", "title": "Diphenylamine \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Diphenylmethane diisocyanate; see Methylene bis(phenylisocyanate)\n\n**CAS No.:** 101688\n\n> 101688 | | Diphenylmethane diisocyanate; see Methylene bis(phenylisocyanate)\n\nSource: \n", "cas_number": "101688", "file": "diphenylmethane-diisocyanate-see-methylene-bis-phenylisocyanate.md", "generated": true, "harvested": "2026-08-05", "id": "diphenylmethane-diisocyanate-see-methylene-bis-phenylisocyanate", "source_quote": "101688 | | Diphenylmethane diisocyanate; see Methylene bis(phenylisocyanate)", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Diphenylmethane diisocyanate; see Methylene bis(phenylisocyanate)", "title": "Diphenylmethane diisocyanate; see Methylene bis(phenylisocyanate) \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Dipropyl ketone\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Dipropyl ketone\n\n**CAS No.:** 123-19-3\n\n> CAS No. 123-19-3\n\n**NIOSH REL (ppm):** TWA 50\n\n**NIOSH REL (mg/m\u00b3):** 235\n\n> NIOSH REL TWA 50 ppm (235 mg/m3)\n\nSource: \n", "cas_number": "123-19-3", "file": "dipropyl-ketone-2.md", "generated": true, "harvested": "2026-09-08", "id": "dipropyl-ketone-2", "quote_cas_number": "CAS No. 123-19-3", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Dipropyl ketone", "rel_mgm3": "235", "rel_ppm": "TWA 50", "source_quote": "NIOSH REL TWA 50 ppm (235 mg/m3)", "sources": ["https://www.cdc.gov/niosh/npg/npgd0242.html"], "stale_after": "2027-09-08", "substance": "Dipropyl ketone", "title": "Dipropyl ketone \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Dipropyl ketone\n\n**CAS No.:** 123193\n\n**PEL (ppm):** 50\n\n**PEL (mg/m\u00b3):** 235\n\n> 123193 | | Dipropyl ketone | 50 | 235\n\nSource: \n", "cas_number": "123193", "file": "dipropyl-ketone.md", "generated": true, "harvested": "2026-08-05", "id": "dipropyl-ketone", "pel_mgm3": "235", "pel_ppm": "50", "source_quote": "123193 | | Dipropyl ketone | 50 | 235", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Dipropyl ketone", "title": "Dipropyl ketone \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Dipropylene glycol methyl ether\n\n**CAS No.:** 34590948\n\n**PEL (ppm):** 100\n\n**PEL (mg/m\u00b3):** 600\n\n**STEL (ppm):** 150\n\n**STEL (mg/m\u00b3):** 900\n\n> 34590948 | S | Dipropylene glycol methyl ether | 100 | 600 | | 150 | 900\n\nSource: \n", "cas_number": "34590948", "file": "dipropylene-glycol-methyl-ether-2.md", "generated": true, "harvested": "2026-08-05", "id": "dipropylene-glycol-methyl-ether-2", "pel_mgm3": "600", "pel_ppm": "100", "source_quote": "34590948 | S | Dipropylene glycol methyl ether | 100 | 600 | | 150 | 900", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "stel_mgm3": "900", "stel_ppm": "150", "substance": "Dipropylene glycol methyl ether", "title": "Dipropylene glycol methyl ether \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Dipropylene glycol methyl ether\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Dipropylene glycol methyl ether\n\n**CAS No.:** 34590-94-8\n\n> CAS No. 34590-94-8\n\n**NIOSH REL (ppm):** TWA 100\n\n**NIOSH REL (mg/m\u00b3):** 600\n\n> NIOSH REL TWA 100 ppm (600 mg/m3) ST 150 ppm (900 mg/m3) [skin]\n\nSource: \n", "cas_number": "34590-94-8", "file": "dipropylene-glycol-methyl-ether-3.md", "generated": true, "harvested": "2026-09-08", "id": "dipropylene-glycol-methyl-ether-3", "quote_cas_number": "CAS No. 34590-94-8", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Dipropylene glycol methyl ether", "rel_mgm3": "600", "rel_ppm": "TWA 100", "source_quote": "NIOSH REL TWA 100 ppm (600 mg/m3) ST 150 ppm (900 mg/m3) [skin]", "sources": ["https://www.cdc.gov/niosh/npg/npgd0241.html"], "stale_after": "2027-09-08", "substance": "Dipropylene glycol methyl ether", "title": "Dipropylene glycol methyl ether \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Dipropylene glycol methyl ether\n\n**CAS No.:** 34590-94-8\n\n**PEL (ppm):** 100\n\n**PEL (mg/m\u00b3):** 600\n\n> Dipropylene glycol methyl ether | 34590-94-8 | 100 | 600 | X |\n\nSource: \n", "cas_number": "34590-94-8", "file": "dipropylene-glycol-methyl-ether.md", "generated": true, "harvested": "2026-08-05", "id": "dipropylene-glycol-methyl-ether", "pel_mgm3": "600", "pel_ppm": "100", "source_quote": "Dipropylene glycol methyl ether | 34590-94-8 | 100 | 600 | X |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Dipropylene glycol methyl ether", "title": "Dipropylene glycol methyl ether \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Diquat; 1,1'-ethylene-2,2'-dipyridinium dibromide\n\n**CAS No.:** 85007\n\n> 85007 | | Diquat; 1,1'-ethylene-2,2'-dipyridinium dibromide | --\n\nSource: \n", "cas_number": "85007", "file": "diquat-1-1-ethylene-2-2-dipyridinium-dibromide.md", "generated": true, "harvested": "2026-08-05", "id": "diquat-1-1-ethylene-2-2-dipyridinium-dibromide", "source_quote": "85007 | | Diquat; 1,1'-ethylene-2,2'-dipyridinium dibromide | --", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Diquat; 1,1'-ethylene-2,2'-dipyridinium dibromide", "title": "Diquat; 1,1'-ethylene-2,2'-dipyridinium dibromide \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Diquat (Diquat dibromide)\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Diquat (Diquat dibromide)\n\n**CAS No.:** 85-00-7\n\n> CAS No. 85-00-7\n\n**NIOSH REL (mg/m\u00b3):** TWA 0.5\n\n> NIOSH REL TWA 0.5 mg/m3\n\nSource: \n", "cas_number": "85-00-7", "file": "diquat-diquat-dibromide.md", "generated": true, "harvested": "2026-09-08", "id": "diquat-diquat-dibromide", "quote_cas_number": "CAS No. 85-00-7", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Diquat (Diquat dibromide)", "rel_mgm3": "TWA 0.5", "source_quote": "NIOSH REL TWA 0.5 mg/m3", "sources": ["https://www.cdc.gov/niosh/npg/npgd0243.html"], "stale_after": "2027-09-08", "substance": "Diquat (Diquat dibromide)", "title": "Diquat (Diquat dibromide) \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Disulfiram\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Disulfiram\n\n**CAS No.:** 97-77-8\n\n> CAS No. 97-77-8\n\n**NIOSH REL (mg/m\u00b3):** TWA 2\n\n> NIOSH REL TWA 2 mg/m3 [Precautions should be taken to avoid concurrent exposure to ethylene dibromide.]\n\nSource: \n", "cas_number": "97-77-8", "file": "disulfiram-2.md", "generated": true, "harvested": "2026-09-08", "id": "disulfiram-2", "quote_cas_number": "CAS No. 97-77-8", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Disulfiram", "rel_mgm3": "TWA 2", "source_quote": "NIOSH REL TWA 2 mg/m3 [Precautions should be taken to avoid concurrent exposure to ethylene dibromide.]", "sources": ["https://www.cdc.gov/niosh/npg/npgd0244.html"], "stale_after": "2027-09-08", "substance": "Disulfiram", "title": "Disulfiram \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Disulfiram\n\n**CAS No.:** 97778\n\n**PEL (mg/m\u00b3):** 2\n\n> 97778 | | Disulfiram | -- | 2\n\nSource: \n", "cas_number": "97778", "file": "disulfiram.md", "generated": true, "harvested": "2026-08-05", "id": "disulfiram", "pel_mgm3": "2", "source_quote": "97778 | | Disulfiram | -- | 2", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Disulfiram", "title": "Disulfiram \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Disulfoton; o,o-diethyl S-2-(ethylthio)ethyl phosphorodithioate\n\n**CAS No.:** 298044\n\n**PEL (mg/m\u00b3):** 0.1\n\n> 298044 | S | Disulfoton; o,o-diethyl S-2-(ethylthio)ethyl phosphorodithioate | -- | 0.1\n\nSource: \n", "cas_number": "298044", "file": "disulfoton-o-o-diethyl-s-2-ethylthio-ethyl-phosphorodithioate.md", "generated": true, "harvested": "2026-08-05", "id": "disulfoton-o-o-diethyl-s-2-ethylthio-ethyl-phosphorodithioate", "pel_mgm3": "0.1", "source_quote": "298044 | S | Disulfoton; o,o-diethyl S-2-(ethylthio)ethyl phosphorodithioate | -- | 0.1", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Disulfoton; o,o-diethyl S-2-(ethylthio)ethyl phosphorodithioate", "title": "Disulfoton; o,o-diethyl S-2-(ethylthio)ethyl phosphorodithioate \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Disulfoton\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Disulfoton\n\n**CAS No.:** 298-04-4\n\n> CAS No. 298-04-4\n\n**NIOSH REL (mg/m\u00b3):** TWA 0.1\n\n> NIOSH REL TWA 0.1 mg/m3 [skin]\n\nSource: \n", "cas_number": "298-04-4", "file": "disulfoton.md", "generated": true, "harvested": "2026-09-08", "id": "disulfoton", "quote_cas_number": "CAS No. 298-04-4", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Disulfoton", "rel_mgm3": "TWA 0.1", "source_quote": "NIOSH REL TWA 0.1 mg/m3 [skin]", "sources": ["https://www.cdc.gov/niosh/npg/npgd0245.html"], "stale_after": "2027-09-08", "substance": "Disulfoton", "title": "Disulfoton \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Diuron\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Diuron\n\n**CAS No.:** 330-54-1\n\n> CAS No. 330-54-1\n\n**NIOSH REL (mg/m\u00b3):** TWA 10\n\n> NIOSH REL TWA 10 mg/m3\n\nSource: \n", "cas_number": "330-54-1", "file": "diuron-2.md", "generated": true, "harvested": "2026-09-08", "id": "diuron-2", "quote_cas_number": "CAS No. 330-54-1", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Diuron", "rel_mgm3": "TWA 10", "source_quote": "NIOSH REL TWA 10 mg/m3", "sources": ["https://www.cdc.gov/niosh/npg/npgd0247.html"], "stale_after": "2027-09-08", "substance": "Diuron", "title": "Diuron \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Diuron\n\n**CAS No.:** 330541\n\n**PEL (mg/m\u00b3):** 10\n\n> 330541 | | Diuron | -- | 10\n\nSource: \n", "cas_number": "330541", "file": "diuron.md", "generated": true, "harvested": "2026-08-05", "id": "diuron", "pel_mgm3": "10", "source_quote": "330541 | | Diuron | -- | 10", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Diuron", "title": "Diuron \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Divinyl benzene\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Divinyl benzene\n\n**CAS No.:** 1321-74-0 (mixed isomers)\n\n> CAS No. 1321-74-0 (mixed isomers)\n\n**NIOSH REL (ppm):** TWA 10\n\n**NIOSH REL (mg/m\u00b3):** 50\n\n> NIOSH REL TWA 10 ppm (50 mg/m3)\n\nSource: \n", "cas_number": "1321-74-0 (mixed isomers)", "file": "divinyl-benzene-2.md", "generated": true, "harvested": "2026-09-08", "id": "divinyl-benzene-2", "quote_cas_number": "CAS No. 1321-74-0 (mixed isomers)", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Divinyl benzene", "rel_mgm3": "50", "rel_ppm": "TWA 10", "source_quote": "NIOSH REL TWA 10 ppm (50 mg/m3)", "sources": ["https://www.cdc.gov/niosh/npg/npgd0248.html"], "stale_after": "2027-09-08", "substance": "Divinyl benzene", "title": "Divinyl benzene \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Divinyl benzene\n\n**CAS No.:** 1321740\n\n**PEL (ppm):** 10\n\n**PEL (mg/m\u00b3):** 50\n\n> 1321740 | | Divinyl benzene | 10 | 50\n\nSource: \n", "cas_number": "1321740", "file": "divinyl-benzene.md", "generated": true, "harvested": "2026-08-05", "id": "divinyl-benzene", "pel_mgm3": "50", "pel_ppm": "10", "source_quote": "1321740 | | Divinyl benzene | 10 | 50", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Divinyl benzene", "title": "Divinyl benzene \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** DMF; see Dimethylformamide\n\n**CAS No.:** 68122\n\n> 68122 | | DMF; see Dimethylformamide\n\nSource: \n", "cas_number": "68122", "file": "dmf-see-dimethylformamide.md", "generated": true, "harvested": "2026-08-05", "id": "dmf-see-dimethylformamide", "source_quote": "68122 | | DMF; see Dimethylformamide", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "DMF; see Dimethylformamide", "title": "DMF; see Dimethylformamide \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** DMH; see 1,1-Dimethylhydrazine\n\n**CAS No.:** 57147\n\n> 57147 | | DMH; see 1,1-Dimethylhydrazine\n\nSource: \n", "cas_number": "57147", "file": "dmh-see-1-1-dimethylhydrazine.md", "generated": true, "harvested": "2026-08-05", "id": "dmh-see-1-1-dimethylhydrazine", "source_quote": "57147 | | DMH; see 1,1-Dimethylhydrazine", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "DMH; see 1,1-Dimethylhydrazine", "title": "DMH; see 1,1-Dimethylhydrazine \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Emery\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Emery\n\n**CAS No.:** 1302-74-5 (corundum)\n\n> CAS No. 1302-74-5 (corundum)\n\n**NIOSH REL, as stated:** See Appendix D\n\n> NIOSH REL See Appendix D\n\nSource: \n", "cas_number": "1302-74-5 (corundum)", "file": "emery-2.md", "generated": true, "harvested": "2026-09-08", "id": "emery-2", "quote_cas_number": "CAS No. 1302-74-5 (corundum)", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Emery", "rel_statement": "See Appendix D", "source_quote": "NIOSH REL See Appendix D", "sources": ["https://www.cdc.gov/niosh/npg/npgd0250.html"], "stale_after": "2027-09-08", "substance": "Emery", "title": "Emery \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Emery; see Particulates not otherwise regulated\n\n**CAS No.:** 12415348\n\n> 12415348 | | Emery; see Particulates not otherwise regulated\n\nSource: \n", "cas_number": "12415348", "file": "emery-see-particulates-not-otherwise-regulated.md", "generated": true, "harvested": "2026-08-05", "id": "emery-see-particulates-not-otherwise-regulated", "source_quote": "12415348 | | Emery; see Particulates not otherwise regulated", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Emery; see Particulates not otherwise regulated", "title": "Emery; see Particulates not otherwise regulated \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Emery\n\n**CAS No.:** 12415-34-8\n\n> Emery | 12415-34-8 | - | - | - |\n\nSource: \n", "cas_number": "12415-34-8", "file": "emery.md", "generated": true, "harvested": "2026-08-05", "id": "emery", "source_quote": "Emery | 12415-34-8 | - | - | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Emery", "title": "Emery \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Endosulfan; 6,7,8,9,10,10-hexachloro-1,5,5a,6,9,9a-hexahydro-6,9-methano-2,4, 3-benzodioxathiepin-3-oxide\n\n**CAS No.:** 115297\n\n**PEL (mg/m\u00b3):** 0.1\n\n> 115297 | S | Endosulfan; 6,7,8,9,10,10-hexachloro-1,5,5a,6,9,9a-hexahydro-6,9-methano-2,4, 3-benzodioxathiepin-3-oxide | -- | 0.1\n\nSource: \n", "cas_number": "115297", "file": "endosulfan-6-7-8-9-10-10-hexachloro-1-5-5a-6-9-9a-hexahydro-6-9-methano-2-4-3-be.md", "generated": true, "harvested": "2026-08-05", "id": "endosulfan-6-7-8-9-10-10-hexachloro-1-5-5a-6-9-9a-hexahydro-6-9-methano-2-4-3-be", "pel_mgm3": "0.1", "source_quote": "115297 | S | Endosulfan; 6,7,8,9,10,10-hexachloro-1,5,5a,6,9,9a-hexahydro-6,9-methano-2,4, 3-benzodioxathiepin-3-oxide | -- | 0.1", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Endosulfan; 6,7,8,9,10,10-hexachloro-1,5,5a,6,9,9a-hexahydro-6,9-methano-2,4, 3-benzodioxathiepin-3-oxide", "title": "Endosulfan; 6,7,8,9,10,10-hexachloro-1,5,5a,6,9,9a-hexahydro-6,9-methano-2,4, 3-benzodioxathiepin-3-oxide \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Endosulfan\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Endosulfan\n\n**CAS No.:** 115-29-7\n\n> CAS No. 115-29-7\n\n**NIOSH REL (mg/m\u00b3):** TWA 0.1\n\n> NIOSH REL TWA 0.1 mg/m3 [skin]\n\nSource: \n", "cas_number": "115-29-7", "file": "endosulfan.md", "generated": true, "harvested": "2026-09-08", "id": "endosulfan", "quote_cas_number": "CAS No. 115-29-7", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Endosulfan", "rel_mgm3": "TWA 0.1", "source_quote": "NIOSH REL TWA 0.1 mg/m3 [skin]", "sources": ["https://www.cdc.gov/niosh/npg/npgd0251.html"], "stale_after": "2027-09-08", "substance": "Endosulfan", "title": "Endosulfan \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Endrin; 1,2,3,4,10,10-hexachloro-6,7-epoxy-1,4,4a,5,6,7,8,8a-octahydro-1,4-endo-endo-5, 8-dimethanonaphthalene\n\n**CAS No.:** 72208\n\n**PEL (mg/m\u00b3):** 0.1\n\n> 72208 | S | Endrin; 1,2,3,4,10,10-hexachloro-6,7-epoxy-1,4,4a,5,6,7,8,8a-octahydro-1,4-endo-endo-5, 8-dimethanonaphthalene | -- | 0.1\n\nSource: \n", "cas_number": "72208", "file": "endrin-1-2-3-4-10-10-hexachloro-6-7-epoxy-1-4-4a-5-6-7-8-8a-octahydro-1-4-endo-e.md", "generated": true, "harvested": "2026-08-05", "id": "endrin-1-2-3-4-10-10-hexachloro-6-7-epoxy-1-4-4a-5-6-7-8-8a-octahydro-1-4-endo-e", "pel_mgm3": "0.1", "source_quote": "72208 | S | Endrin; 1,2,3,4,10,10-hexachloro-6,7-epoxy-1,4,4a,5,6,7,8,8a-octahydro-1,4-endo-endo-5, 8-dimethanonaphthalene | -- | 0.1", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Endrin; 1,2,3,4,10,10-hexachloro-6,7-epoxy-1,4,4a,5,6,7,8,8a-octahydro-1,4-endo-endo-5, 8-dimethanonaphthalene", "title": "Endrin; 1,2,3,4,10,10-hexachloro-6,7-epoxy-1,4,4a,5,6,7,8,8a-octahydro-1,4-endo-endo-5, 8-dimethanonaphthalene \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Endrin\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Endrin\n\n**CAS No.:** 72-20-8\n\n> CAS No. 72-20-8\n\n**NIOSH REL (mg/m\u00b3):** TWA 0.1\n\n> NIOSH REL TWA 0.1 mg/m3 [skin]\n\nSource: \n", "cas_number": "72-20-8", "file": "endrin-2.md", "generated": true, "harvested": "2026-09-08", "id": "endrin-2", "quote_cas_number": "CAS No. 72-20-8", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Endrin", "rel_mgm3": "TWA 0.1", "source_quote": "NIOSH REL TWA 0.1 mg/m3 [skin]", "sources": ["https://www.cdc.gov/niosh/npg/npgd0252.html"], "stale_after": "2027-09-08", "substance": "Endrin", "title": "Endrin \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Endrin\n\n**CAS No.:** 72-20-8\n\n**PEL (mg/m\u00b3):** 0.1\n\n> Endrin | 72-20-8 | - | 0.1 | X |\n\nSource: \n", "cas_number": "72-20-8", "file": "endrin.md", "generated": true, "harvested": "2026-08-05", "id": "endrin", "pel_mgm3": "0.1", "source_quote": "Endrin | 72-20-8 | - | 0.1 | X |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Endrin", "title": "Endrin \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Enflurane\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Enflurane\n\n**CAS No.:** 13838-16-9\n\n> CAS No. 13838-16-9\n\n**NIOSH REL (ppm):** C 2\n\n**NIOSH REL (mg/m\u00b3):** 15.1\n\n> NIOSH REL C 2 ppm (15.1 mg/m3) [60-minute]\n\nSource: \n", "cas_number": "13838-16-9", "file": "enflurane-2.md", "generated": true, "harvested": "2026-09-08", "id": "enflurane-2", "quote_cas_number": "CAS No. 13838-16-9", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Enflurane", "rel_mgm3": "15.1", "rel_ppm": "C 2", "source_quote": "NIOSH REL C 2 ppm (15.1 mg/m3) [60-minute]", "sources": ["https://www.cdc.gov/niosh/npg/npgd0253.html"], "stale_after": "2027-09-08", "substance": "Enflurane", "title": "Enflurane \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Enflurane\n\n**CAS No.:** 13838169\n\n**PEL (ppm):** 2\n\n**PEL (mg/m\u00b3):** 15\n\n> 13838169 | | Enflurane | 2 | 15\n\nSource: \n", "cas_number": "13838169", "file": "enflurane.md", "generated": true, "harvested": "2026-08-05", "id": "enflurane", "pel_mgm3": "15", "pel_ppm": "2", "source_quote": "13838169 | | Enflurane | 2 | 15", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Enflurane", "title": "Enflurane \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Epichlorohydrin; 1-chloro-2, 3-epoxypropane\n\n**CAS No.:** 106898\n\n**PEL (ppm):** 0.05\n\n**PEL (mg/m\u00b3):** 0.19\n\n> 106898 | S | Epichlorohydrin; 1-chloro-2, 3-epoxypropane | 0.05 | 0.19\n\nSource: \n", "cas_number": "106898", "file": "epichlorohydrin-1-chloro-2-3-epoxypropane.md", "generated": true, "harvested": "2026-08-05", "id": "epichlorohydrin-1-chloro-2-3-epoxypropane", "pel_mgm3": "0.19", "pel_ppm": "0.05", "source_quote": "106898 | S | Epichlorohydrin; 1-chloro-2, 3-epoxypropane | 0.05 | 0.19", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Epichlorohydrin; 1-chloro-2, 3-epoxypropane", "title": "Epichlorohydrin; 1-chloro-2, 3-epoxypropane \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Epichlorohydrin\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Epichlorohydrin\n\n**CAS No.:** 106-89-8\n\n> CAS No. 106-89-8\n\n**NIOSH REL, as stated:** Ca See Appendix A\n\n> NIOSH REL Ca See Appendix A\n\nSource: \n", "cas_number": "106-89-8", "file": "epichlorohydrin-2.md", "generated": true, "harvested": "2026-09-08", "id": "epichlorohydrin-2", "quote_cas_number": "CAS No. 106-89-8", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Epichlorohydrin", "rel_statement": "Ca See Appendix A", "source_quote": "NIOSH REL Ca See Appendix A", "sources": ["https://www.cdc.gov/niosh/npg/npgd0254.html"], "stale_after": "2027-09-08", "substance": "Epichlorohydrin", "title": "Epichlorohydrin \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Epichlorohydrin\n\n**CAS No.:** 106-89-8\n\n**PEL (ppm):** 5\n\n**PEL (mg/m\u00b3):** 19\n\n> Epichlorohydrin | 106-89-8 | 5 | 19 | X |\n\nSource: \n", "cas_number": "106-89-8", "file": "epichlorohydrin.md", "generated": true, "harvested": "2026-08-05", "id": "epichlorohydrin", "pel_mgm3": "19", "pel_ppm": "5", "source_quote": "Epichlorohydrin | 106-89-8 | 5 | 19 | X |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Epichlorohydrin", "title": "Epichlorohydrin \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** EPN\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - EPN\n\n**CAS No.:** 2104-64-5\n\n> CAS No. 2104-64-5\n\n**NIOSH REL (mg/m\u00b3):** TWA 0.5\n\n> NIOSH REL TWA 0.5 mg/m3 [skin]\n\nSource: \n", "cas_number": "2104-64-5", "file": "epn-2.md", "generated": true, "harvested": "2026-09-08", "id": "epn-2", "quote_cas_number": "CAS No. 2104-64-5", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - EPN", "rel_mgm3": "TWA 0.5", "source_quote": "NIOSH REL TWA 0.5 mg/m3 [skin]", "sources": ["https://www.cdc.gov/niosh/npg/npgd0255.html"], "stale_after": "2027-09-08", "substance": "EPN", "title": "EPN \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** EPN; o-ethyl o-(p-nitrophenyl) phenylphosphonothioate\n\n**CAS No.:** 2104645\n\n**PEL (mg/m\u00b3):** 0.1\n\n> 2104645 | S | EPN; o-ethyl o-(p-nitrophenyl) phenylphosphonothioate | -- | 0.1\n\nSource: \n", "cas_number": "2104645", "file": "epn-o-ethyl-o-p-nitrophenyl-phenylphosphonothioate.md", "generated": true, "harvested": "2026-08-05", "id": "epn-o-ethyl-o-p-nitrophenyl-phenylphosphonothioate", "pel_mgm3": "0.1", "source_quote": "2104645 | S | EPN; o-ethyl o-(p-nitrophenyl) phenylphosphonothioate | -- | 0.1", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "EPN; o-ethyl o-(p-nitrophenyl) phenylphosphonothioate", "title": "EPN; o-ethyl o-(p-nitrophenyl) phenylphosphonothioate \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** EPN\n\n**CAS No.:** 2104-64-5\n\n**PEL (mg/m\u00b3):** 0.5\n\n> EPN | 2104-64-5 | - | 0.5 | X |\n\nSource: \n", "cas_number": "2104-64-5", "file": "epn.md", "generated": true, "harvested": "2026-08-05", "id": "epn", "pel_mgm3": "0.5", "source_quote": "EPN | 2104-64-5 | - | 0.5 | X |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "EPN", "title": "EPN \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Ethane\n\n**CAS No.:** 74840\n\n> 74840 | | Ethane | (h) | --\n\nSource: \n", "cas_number": "74840", "file": "ethane.md", "generated": true, "harvested": "2026-08-05", "id": "ethane", "source_quote": "74840 | | Ethane | (h) | --", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Ethane", "title": "Ethane \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Ethanethiol; see Ethyl mercaptan\n\n**CAS No.:** 75081\n\n> 75081 | | Ethanethiol; see Ethyl mercaptan\n\nSource: \n", "cas_number": "75081", "file": "ethanethiol-see-ethyl-mercaptan.md", "generated": true, "harvested": "2026-08-05", "id": "ethanethiol-see-ethyl-mercaptan", "source_quote": "75081 | | Ethanethiol; see Ethyl mercaptan", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Ethanethiol; see Ethyl mercaptan", "title": "Ethanethiol; see Ethyl mercaptan \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Ethanol; see Ethyl alcohol\n\n**CAS No.:** 64175\n\n> 64175 | | Ethanol; see Ethyl alcohol\n\nSource: \n", "cas_number": "64175", "file": "ethanol-see-ethyl-alcohol.md", "generated": true, "harvested": "2026-08-05", "id": "ethanol-see-ethyl-alcohol", "source_quote": "64175 | | Ethanol; see Ethyl alcohol", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Ethanol; see Ethyl alcohol", "title": "Ethanol; see Ethyl alcohol \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Ethanolamine; 2-aminoethanol\n\n**CAS No.:** 141435\n\n**PEL (ppm):** 3\n\n**PEL (mg/m\u00b3):** 8\n\n**STEL (ppm):** 6\n\n**STEL (mg/m\u00b3):** 15\n\n> 141435 | | Ethanolamine; 2-aminoethanol | 3 | 8 | | 6 | 15\n\nSource: \n", "cas_number": "141435", "file": "ethanolamine-2-aminoethanol.md", "generated": true, "harvested": "2026-08-05", "id": "ethanolamine-2-aminoethanol", "pel_mgm3": "8", "pel_ppm": "3", "source_quote": "141435 | | Ethanolamine; 2-aminoethanol | 3 | 8 | | 6 | 15", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "stel_mgm3": "15", "stel_ppm": "6", "substance": "Ethanolamine; 2-aminoethanol", "title": "Ethanolamine; 2-aminoethanol \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Ethanolamine\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Ethanolamine\n\n**CAS No.:** 141-43-5\n\n> CAS No. 141-43-5\n\n**NIOSH REL (ppm):** TWA 3\n\n**NIOSH REL (mg/m\u00b3):** 8\n\n> NIOSH REL TWA 3 ppm (8 mg/m3) ST 6 ppm (15 mg/m3)\n\nSource: \n", "cas_number": "141-43-5", "file": "ethanolamine-2.md", "generated": true, "harvested": "2026-09-08", "id": "ethanolamine-2", "quote_cas_number": "CAS No. 141-43-5", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Ethanolamine", "rel_mgm3": "8", "rel_ppm": "TWA 3", "source_quote": "NIOSH REL TWA 3 ppm (8 mg/m3) ST 6 ppm (15 mg/m3)", "sources": ["https://www.cdc.gov/niosh/npg/npgd0256.html"], "stale_after": "2027-09-08", "substance": "Ethanolamine", "title": "Ethanolamine \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Ethanolamine\n\n**CAS No.:** 141-43-5\n\n**PEL (ppm):** 3\n\n**PEL (mg/m\u00b3):** 6\n\n> Ethanolamine | 141-43-5 | 3 | 6 | - |\n\nSource: \n", "cas_number": "141-43-5", "file": "ethanolamine.md", "generated": true, "harvested": "2026-08-05", "id": "ethanolamine", "pel_mgm3": "6", "pel_ppm": "3", "source_quote": "Ethanolamine | 141-43-5 | 3 | 6 | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Ethanolamine", "title": "Ethanolamine \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Ethion\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Ethion\n\n**CAS No.:** 563-12-2\n\n> CAS No. 563-12-2\n\n**NIOSH REL (mg/m\u00b3):** TWA 0.4\n\n> NIOSH REL TWA 0.4 mg/m3 [skin]\n\nSource: \n", "cas_number": "563-12-2", "file": "ethion-2.md", "generated": true, "harvested": "2026-09-08", "id": "ethion-2", "quote_cas_number": "CAS No. 563-12-2", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Ethion", "rel_mgm3": "TWA 0.4", "source_quote": "NIOSH REL TWA 0.4 mg/m3 [skin]", "sources": ["https://www.cdc.gov/niosh/npg/npgd0257.html"], "stale_after": "2027-09-08", "substance": "Ethion", "title": "Ethion \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Ethion\n\n**CAS No.:** 563122\n\n**PEL (mg/m\u00b3):** 0.4\n\n> 563122 | S | Ethion | -- | 0.4\n\nSource: \n", "cas_number": "563122", "file": "ethion.md", "generated": true, "harvested": "2026-08-05", "id": "ethion", "pel_mgm3": "0.4", "source_quote": "563122 | S | Ethion | -- | 0.4", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Ethion", "title": "Ethion \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Ethyl acetate\n\n**CAS No.:** 141786\n\n**PEL (ppm):** 400\n\n**PEL (mg/m\u00b3):** 1,400\n\n> 141786 | | Ethyl acetate | 400 | 1,400\n\nSource: \n", "cas_number": "141786", "file": "ethyl-acetate-2.md", "generated": true, "harvested": "2026-08-05", "id": "ethyl-acetate-2", "pel_mgm3": "1,400", "pel_ppm": "400", "source_quote": "141786 | | Ethyl acetate | 400 | 1,400", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Ethyl acetate", "title": "Ethyl acetate \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Ethyl acetate\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Ethyl acetate\n\n**CAS No.:** 141-78-6\n\n> CAS No. 141-78-6\n\n**NIOSH REL (ppm):** TWA 400\n\n**NIOSH REL (mg/m\u00b3):** 1400\n\n> NIOSH REL TWA 400 ppm (1400 mg/m3)\n\nSource: \n", "cas_number": "141-78-6", "file": "ethyl-acetate-3.md", "generated": true, "harvested": "2026-09-08", "id": "ethyl-acetate-3", "quote_cas_number": "CAS No. 141-78-6", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Ethyl acetate", "rel_mgm3": "1400", "rel_ppm": "TWA 400", "source_quote": "NIOSH REL TWA 400 ppm (1400 mg/m3)", "sources": ["https://www.cdc.gov/niosh/npg/npgd0260.html"], "stale_after": "2027-09-08", "substance": "Ethyl acetate", "title": "Ethyl acetate \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Ethyl acetate\n\n**CAS No.:** 141-78-6\n\n**PEL (ppm):** 400\n\n**PEL (mg/m\u00b3):** 1400\n\n> Ethyl acetate | 141-78-6 | 400 | 1400 | - |\n\nSource: \n", "cas_number": "141-78-6", "file": "ethyl-acetate.md", "generated": true, "harvested": "2026-08-05", "id": "ethyl-acetate", "pel_mgm3": "1400", "pel_ppm": "400", "source_quote": "Ethyl acetate | 141-78-6 | 400 | 1400 | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Ethyl acetate", "title": "Ethyl acetate \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Ethyl acrylate\n\n**CAS No.:** 140885\n\n**PEL (ppm):** 5\n\n**PEL (mg/m\u00b3):** 20\n\n**STEL (ppm):** 25\n\n**STEL (mg/m\u00b3):** 100\n\n> 140885 | S | Ethyl acrylate | 5 | 20 | | 25 | 100\n\nSource: \n", "cas_number": "140885", "file": "ethyl-acrylate-2.md", "generated": true, "harvested": "2026-08-05", "id": "ethyl-acrylate-2", "pel_mgm3": "20", "pel_ppm": "5", "source_quote": "140885 | S | Ethyl acrylate | 5 | 20 | | 25 | 100", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "stel_mgm3": "100", "stel_ppm": "25", "substance": "Ethyl acrylate", "title": "Ethyl acrylate \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Ethyl acrylate\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Ethyl acrylate\n\n**CAS No.:** 140-88-5\n\n> CAS No. 140-88-5\n\n**NIOSH REL, as stated:** Ca See Appendix A\n\n> NIOSH REL Ca See Appendix A\n\nSource: \n", "cas_number": "140-88-5", "file": "ethyl-acrylate-3.md", "generated": true, "harvested": "2026-09-08", "id": "ethyl-acrylate-3", "quote_cas_number": "CAS No. 140-88-5", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Ethyl acrylate", "rel_statement": "Ca See Appendix A", "source_quote": "NIOSH REL Ca See Appendix A", "sources": ["https://www.cdc.gov/niosh/npg/npgd0261.html"], "stale_after": "2027-09-08", "substance": "Ethyl acrylate", "title": "Ethyl acrylate \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Ethyl acrylate\n\n**CAS No.:** 140-88-5\n\n**PEL (ppm):** 25\n\n**PEL (mg/m\u00b3):** 100\n\n> Ethyl acrylate | 140-88-5 | 25 | 100 | X |\n\nSource: \n", "cas_number": "140-88-5", "file": "ethyl-acrylate.md", "generated": true, "harvested": "2026-08-05", "id": "ethyl-acrylate", "pel_mgm3": "100", "pel_ppm": "25", "source_quote": "Ethyl acrylate | 140-88-5 | 25 | 100 | X |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Ethyl acrylate", "title": "Ethyl acrylate \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Ethyl alcohol; ethanol\n\n**CAS No.:** 64175\n\n**PEL (ppm):** 1,000\n\n**PEL (mg/m\u00b3):** 1,900\n\n> 64175 | | Ethyl alcohol; ethanol | 1,000 | 1,900\n\nSource: \n", "cas_number": "64175", "file": "ethyl-alcohol-ethanol-2.md", "generated": true, "harvested": "2026-08-05", "id": "ethyl-alcohol-ethanol-2", "pel_mgm3": "1,900", "pel_ppm": "1,000", "source_quote": "64175 | | Ethyl alcohol; ethanol | 1,000 | 1,900", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Ethyl alcohol; ethanol", "title": "Ethyl alcohol; ethanol \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Ethyl alcohol (Ethanol)\n\n**CAS No.:** 64-17-5\n\n**PEL (ppm):** 1000\n\n**PEL (mg/m\u00b3):** 1900\n\n> Ethyl alcohol (Ethanol) | 64-17-5 | 1000 | 1900 | - |\n\nSource: \n", "cas_number": "64-17-5", "file": "ethyl-alcohol-ethanol.md", "generated": true, "harvested": "2026-08-05", "id": "ethyl-alcohol-ethanol", "pel_mgm3": "1900", "pel_ppm": "1000", "source_quote": "Ethyl alcohol (Ethanol) | 64-17-5 | 1000 | 1900 | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Ethyl alcohol (Ethanol)", "title": "Ethyl alcohol (Ethanol) \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Ethyl alcohol\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Ethyl alcohol\n\n**CAS No.:** 64-17-5\n\n> CAS No. 64-17-5\n\n**NIOSH REL (ppm):** TWA 1000\n\n**NIOSH REL (mg/m\u00b3):** 1900\n\n> NIOSH REL TWA 1000 ppm (1900 mg/m3)\n\nSource: \n", "cas_number": "64-17-5", "file": "ethyl-alcohol.md", "generated": true, "harvested": "2026-09-08", "id": "ethyl-alcohol", "quote_cas_number": "CAS No. 64-17-5", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Ethyl alcohol", "rel_mgm3": "1900", "rel_ppm": "TWA 1000", "source_quote": "NIOSH REL TWA 1000 ppm (1900 mg/m3)", "sources": ["https://www.cdc.gov/niosh/npg/npgd0262.html"], "stale_after": "2027-09-08", "substance": "Ethyl alcohol", "title": "Ethyl alcohol \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Ethyl amyl ketone (5-Methyl-3-heptanone)\n\n**CAS No.:** 541-85-5\n\n**PEL (ppm):** 25\n\n**PEL (mg/m\u00b3):** 130\n\n> Ethyl amyl ketone (5-Methyl-3-heptanone) | 541-85-5 | 25 | 130 | - |\n\nSource: \n", "cas_number": "541-85-5", "file": "ethyl-amyl-ketone-5-methyl-3-heptanone.md", "generated": true, "harvested": "2026-08-05", "id": "ethyl-amyl-ketone-5-methyl-3-heptanone", "pel_mgm3": "130", "pel_ppm": "25", "source_quote": "Ethyl amyl ketone (5-Methyl-3-heptanone) | 541-85-5 | 25 | 130 | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Ethyl amyl ketone (5-Methyl-3-heptanone)", "title": "Ethyl amyl ketone (5-Methyl-3-heptanone) \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Ethyl benzene\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Ethyl benzene\n\n**CAS No.:** 100-41-4\n\n> CAS No. 100-41-4\n\n**NIOSH REL (ppm):** TWA 100\n\n**NIOSH REL (mg/m\u00b3):** 435\n\n> NIOSH REL TWA 100 ppm (435 mg/m3) ST 125 ppm (545 mg/m3)\n\nSource: \n", "cas_number": "100-41-4", "file": "ethyl-benzene-2.md", "generated": true, "harvested": "2026-09-08", "id": "ethyl-benzene-2", "quote_cas_number": "CAS No. 100-41-4", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Ethyl benzene", "rel_mgm3": "435", "rel_ppm": "TWA 100", "source_quote": "NIOSH REL TWA 100 ppm (435 mg/m3) ST 125 ppm (545 mg/m3)", "sources": ["https://www.cdc.gov/niosh/npg/npgd0264.html"], "stale_after": "2027-09-08", "substance": "Ethyl benzene", "title": "Ethyl benzene \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Ethyl benzene\n\n**CAS No.:** 100-41-4\n\n**PEL (ppm):** 100\n\n**PEL (mg/m\u00b3):** 435\n\n> Ethyl benzene | 100-41-4 | 100 | 435 | - |\n\nSource: \n", "cas_number": "100-41-4", "file": "ethyl-benzene.md", "generated": true, "harvested": "2026-08-05", "id": "ethyl-benzene", "pel_mgm3": "435", "pel_ppm": "100", "source_quote": "Ethyl benzene | 100-41-4 | 100 | 435 | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Ethyl benzene", "title": "Ethyl benzene \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Ethyl bromide\n\n**CAS No.:** 74964\n\n**PEL (ppm):** 5\n\n**PEL (mg/m\u00b3):** 22\n\n> 74964 | S | Ethyl bromide | 5 | 22\n\nSource: \n", "cas_number": "74964", "file": "ethyl-bromide-2.md", "generated": true, "harvested": "2026-08-05", "id": "ethyl-bromide-2", "pel_mgm3": "22", "pel_ppm": "5", "source_quote": "74964 | S | Ethyl bromide | 5 | 22", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Ethyl bromide", "title": "Ethyl bromide \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Ethyl bromide\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Ethyl bromide\n\n**CAS No.:** 74-96-4\n\n> CAS No. 74-96-4\n\n**NIOSH REL, as stated:** See Appendix D\n\n> NIOSH REL See Appendix D\n\nSource: \n", "cas_number": "74-96-4", "file": "ethyl-bromide-3.md", "generated": true, "harvested": "2026-09-08", "id": "ethyl-bromide-3", "quote_cas_number": "CAS No. 74-96-4", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Ethyl bromide", "rel_statement": "See Appendix D", "source_quote": "NIOSH REL See Appendix D", "sources": ["https://www.cdc.gov/niosh/npg/npgd0265.html"], "stale_after": "2027-09-08", "substance": "Ethyl bromide", "title": "Ethyl bromide \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Ethyl bromide\n\n**CAS No.:** 74-96-4\n\n**PEL (ppm):** 200\n\n**PEL (mg/m\u00b3):** 890\n\n> Ethyl bromide | 74-96-4 | 200 | 890 | - |\n\nSource: \n", "cas_number": "74-96-4", "file": "ethyl-bromide.md", "generated": true, "harvested": "2026-08-05", "id": "ethyl-bromide", "pel_mgm3": "890", "pel_ppm": "200", "source_quote": "Ethyl bromide | 74-96-4 | 200 | 890 | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Ethyl bromide", "title": "Ethyl bromide \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Ethyl butyl ketone; 3-heptanone\n\n**CAS No.:** 106354\n\n**PEL (ppm):** 50\n\n**PEL (mg/m\u00b3):** 230\n\n**STEL (ppm):** 75\n\n**STEL (mg/m\u00b3):** 345\n\n> 106354 | | Ethyl butyl ketone; 3-heptanone | 50 | 230 | | 75 | 345\n\nSource: \n", "cas_number": "106354", "file": "ethyl-butyl-ketone-3-heptanone-2.md", "generated": true, "harvested": "2026-08-05", "id": "ethyl-butyl-ketone-3-heptanone-2", "pel_mgm3": "230", "pel_ppm": "50", "source_quote": "106354 | | Ethyl butyl ketone; 3-heptanone | 50 | 230 | | 75 | 345", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "stel_mgm3": "345", "stel_ppm": "75", "substance": "Ethyl butyl ketone; 3-heptanone", "title": "Ethyl butyl ketone; 3-heptanone \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Ethyl butyl ketone (3-Heptanone)\n\n**CAS No.:** 106-35-4\n\n**PEL (ppm):** 50\n\n**PEL (mg/m\u00b3):** 230\n\n> Ethyl butyl ketone (3-Heptanone) | 106-35-4 | 50 | 230 | - |\n\nSource: \n", "cas_number": "106-35-4", "file": "ethyl-butyl-ketone-3-heptanone.md", "generated": true, "harvested": "2026-08-05", "id": "ethyl-butyl-ketone-3-heptanone", "pel_mgm3": "230", "pel_ppm": "50", "source_quote": "Ethyl butyl ketone (3-Heptanone) | 106-35-4 | 50 | 230 | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Ethyl butyl ketone (3-Heptanone)", "title": "Ethyl butyl ketone (3-Heptanone) \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Ethyl butyl ketone\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Ethyl butyl ketone\n\n**CAS No.:** 106-35-4\n\n> CAS No. 106-35-4\n\n**NIOSH REL (ppm):** TWA 50\n\n**NIOSH REL (mg/m\u00b3):** 230\n\n> NIOSH REL TWA 50 ppm (230 mg/m3)\n\nSource: \n", "cas_number": "106-35-4", "file": "ethyl-butyl-ketone.md", "generated": true, "harvested": "2026-09-08", "id": "ethyl-butyl-ketone", "quote_cas_number": "CAS No. 106-35-4", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Ethyl butyl ketone", "rel_mgm3": "230", "rel_ppm": "TWA 50", "source_quote": "NIOSH REL TWA 50 ppm (230 mg/m3)", "sources": ["https://www.cdc.gov/niosh/npg/npgd0266.html"], "stale_after": "2027-09-08", "substance": "Ethyl butyl ketone", "title": "Ethyl butyl ketone \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Ethyl chloride\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Ethyl chloride\n\n**CAS No.:** 75-00-3\n\n> CAS No. 75-00-3\n\n**NIOSH REL, as stated:** Handle with caution in the workplace. See Appendix C (Chloroethanes)\n\n> NIOSH REL Handle with caution in the workplace. See Appendix C (Chloroethanes)\n\nSource: \n", "cas_number": "75-00-3", "file": "ethyl-chloride-2.md", "generated": true, "harvested": "2026-09-08", "id": "ethyl-chloride-2", "quote_cas_number": "CAS No. 75-00-3", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Ethyl chloride", "rel_statement": "Handle with caution in the workplace. See Appendix C (Chloroethanes)", "source_quote": "NIOSH REL Handle with caution in the workplace. See Appendix C (Chloroethanes)", "sources": ["https://www.cdc.gov/niosh/npg/npgd0267.html"], "stale_after": "2027-09-08", "substance": "Ethyl chloride", "title": "Ethyl chloride \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Ethyl chloride; chloroethane\n\n**CAS No.:** 75003\n\n**PEL (ppm):** 100\n\n**PEL (mg/m\u00b3):** 264\n\n> 75003 | S | Ethyl chloride; chloroethane | 100 | 264\n\nSource: \n", "cas_number": "75003", "file": "ethyl-chloride-chloroethane.md", "generated": true, "harvested": "2026-08-05", "id": "ethyl-chloride-chloroethane", "pel_mgm3": "264", "pel_ppm": "100", "source_quote": "75003 | S | Ethyl chloride; chloroethane | 100 | 264", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Ethyl chloride; chloroethane", "title": "Ethyl chloride; chloroethane \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Ethyl chloride\n\n**CAS No.:** 75-00-3\n\n**PEL (ppm):** 1000\n\n**PEL (mg/m\u00b3):** 2600\n\n> Ethyl chloride | 75-00-3 | 1000 | 2600 | - |\n\nSource: \n", "cas_number": "75-00-3", "file": "ethyl-chloride.md", "generated": true, "harvested": "2026-08-05", "id": "ethyl-chloride", "pel_mgm3": "2600", "pel_ppm": "1000", "source_quote": "Ethyl chloride | 75-00-3 | 1000 | 2600 | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Ethyl chloride", "title": "Ethyl chloride \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Ethyl cyanoacrylate\n\n**CAS No.:** 7085850\n\n**PEL (ppm):** 0.2\n\n**PEL (mg/m\u00b3):** 1.02\n\n> 7085850 | | Ethyl cyanoacrylate | 0.2 | 1.02\n\nSource: \n", "cas_number": "7085850", "file": "ethyl-cyanoacrylate.md", "generated": true, "harvested": "2026-08-05", "id": "ethyl-cyanoacrylate", "pel_mgm3": "1.02", "pel_ppm": "0.2", "source_quote": "7085850 | | Ethyl cyanoacrylate | 0.2 | 1.02", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Ethyl cyanoacrylate", "title": "Ethyl cyanoacrylate \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Ethyl ether\n\n**CAS No.:** 60297\n\n**PEL (ppm):** 400\n\n**PEL (mg/m\u00b3):** 1,200\n\n**STEL (ppm):** 500\n\n**STEL (mg/m\u00b3):** 1500\n\n> 60297 | | Ethyl ether | 400 | 1,200 | | 500 | 1500\n\nSource: \n", "cas_number": "60297", "file": "ethyl-ether-2.md", "generated": true, "harvested": "2026-08-05", "id": "ethyl-ether-2", "pel_mgm3": "1,200", "pel_ppm": "400", "source_quote": "60297 | | Ethyl ether | 400 | 1,200 | | 500 | 1500", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "stel_mgm3": "1500", "stel_ppm": "500", "substance": "Ethyl ether", "title": "Ethyl ether \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Ethyl ether\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Ethyl ether\n\n**CAS No.:** 60-29-7\n\n> CAS No. 60-29-7\n\n**NIOSH REL, as stated:** See Appendix D\n\n> NIOSH REL See Appendix D\n\nSource: \n", "cas_number": "60-29-7", "file": "ethyl-ether-3.md", "generated": true, "harvested": "2026-09-08", "id": "ethyl-ether-3", "quote_cas_number": "CAS No. 60-29-7", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Ethyl ether", "rel_statement": "See Appendix D", "source_quote": "NIOSH REL See Appendix D", "sources": ["https://www.cdc.gov/niosh/npg/npgd0277.html"], "stale_after": "2027-09-08", "substance": "Ethyl ether", "title": "Ethyl ether \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Ethyl ether\n\n**CAS No.:** 60-29-7\n\n**PEL (ppm):** 400\n\n**PEL (mg/m\u00b3):** 1200\n\n> Ethyl ether | 60-29-7 | 400 | 1200 | - |\n\nSource: \n", "cas_number": "60-29-7", "file": "ethyl-ether.md", "generated": true, "harvested": "2026-08-05", "id": "ethyl-ether", "pel_mgm3": "1200", "pel_ppm": "400", "source_quote": "Ethyl ether | 60-29-7 | 400 | 1200 | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Ethyl ether", "title": "Ethyl ether \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Ethyl formate\n\n**CAS No.:** 109944\n\n**PEL (ppm):** 100\n\n**PEL (mg/m\u00b3):** 300\n\n> 109944 | | Ethyl formate | 100 | 300\n\nSource: \n", "cas_number": "109944", "file": "ethyl-formate-2.md", "generated": true, "harvested": "2026-08-05", "id": "ethyl-formate-2", "pel_mgm3": "300", "pel_ppm": "100", "source_quote": "109944 | | Ethyl formate | 100 | 300", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Ethyl formate", "title": "Ethyl formate \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Ethyl formate\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Ethyl formate\n\n**CAS No.:** 109-94-4\n\n> CAS No. 109-94-4\n\n**NIOSH REL (ppm):** TWA 100\n\n**NIOSH REL (mg/m\u00b3):** 300\n\n> NIOSH REL TWA 100 ppm (300 mg/m3)\n\nSource: \n", "cas_number": "109-94-4", "file": "ethyl-formate-3.md", "generated": true, "harvested": "2026-09-08", "id": "ethyl-formate-3", "quote_cas_number": "CAS No. 109-94-4", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Ethyl formate", "rel_mgm3": "300", "rel_ppm": "TWA 100", "source_quote": "NIOSH REL TWA 100 ppm (300 mg/m3)", "sources": ["https://www.cdc.gov/niosh/npg/npgd0278.html"], "stale_after": "2027-09-08", "substance": "Ethyl formate", "title": "Ethyl formate \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Ethyl formate\n\n**CAS No.:** 109-94-4\n\n**PEL (ppm):** 100\n\n**PEL (mg/m\u00b3):** 300\n\n> Ethyl formate | 109-94-4 | 100 | 300 | - |\n\nSource: \n", "cas_number": "109-94-4", "file": "ethyl-formate.md", "generated": true, "harvested": "2026-08-05", "id": "ethyl-formate", "pel_mgm3": "300", "pel_ppm": "100", "source_quote": "Ethyl formate | 109-94-4 | 100 | 300 | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Ethyl formate", "title": "Ethyl formate \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Ethyl mercaptan\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Ethyl mercaptan\n\n**CAS No.:** 75-08-1\n\n> CAS No. 75-08-1\n\n**NIOSH REL (ppm):** C 0.5\n\n**NIOSH REL (mg/m\u00b3):** 1.3\n\n> NIOSH REL C 0.5 ppm (1.3 mg/m3) [15-minute]\n\nSource: \n", "cas_number": "75-08-1", "file": "ethyl-mercaptan-2.md", "generated": true, "harvested": "2026-09-08", "id": "ethyl-mercaptan-2", "quote_cas_number": "CAS No. 75-08-1", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Ethyl mercaptan", "rel_mgm3": "1.3", "rel_ppm": "C 0.5", "source_quote": "NIOSH REL C 0.5 ppm (1.3 mg/m3) [15-minute]", "sources": ["https://www.cdc.gov/niosh/npg/npgd0280.html"], "stale_after": "2027-09-08", "substance": "Ethyl mercaptan", "title": "Ethyl mercaptan \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Ethyl mercaptan; ethanethiol\n\n**CAS No.:** 75081\n\n**PEL (ppm):** 0.5\n\n**PEL (mg/m\u00b3):** 1\n\n> 75081 | | Ethyl mercaptan; ethanethiol | 0.5 | 1\n\nSource: \n", "cas_number": "75081", "file": "ethyl-mercaptan-ethanethiol.md", "generated": true, "harvested": "2026-08-05", "id": "ethyl-mercaptan-ethanethiol", "pel_mgm3": "1", "pel_ppm": "0.5", "source_quote": "75081 | | Ethyl mercaptan; ethanethiol | 0.5 | 1", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Ethyl mercaptan; ethanethiol", "title": "Ethyl mercaptan; ethanethiol \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Ethyl mercaptan\n\n**CAS No.:** 75-08-1\n\n**PEL (ppm):** (C)10\n\n**PEL (mg/m\u00b3):** (C)25\n\n> Ethyl mercaptan | 75-08-1 | (C)10 | (C)25 | - |\n\nSource: \n", "cas_number": "75-08-1", "file": "ethyl-mercaptan.md", "generated": true, "harvested": "2026-08-05", "id": "ethyl-mercaptan", "pel_mgm3": "(C)25", "pel_ppm": "(C)10", "source_quote": "Ethyl mercaptan | 75-08-1 | (C)10 | (C)25 | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Ethyl mercaptan", "title": "Ethyl mercaptan \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Ethyl methyl ketone; see Methyl ethyl ketone\n\n**CAS No.:** 78933\n\n> 78933 | | Ethyl methyl ketone; see Methyl ethyl ketone\n\nSource: \n", "cas_number": "78933", "file": "ethyl-methyl-ketone-see-methyl-ethyl-ketone.md", "generated": true, "harvested": "2026-08-05", "id": "ethyl-methyl-ketone-see-methyl-ethyl-ketone", "source_quote": "78933 | | Ethyl methyl ketone; see Methyl ethyl ketone", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Ethyl methyl ketone; see Methyl ethyl ketone", "title": "Ethyl methyl ketone; see Methyl ethyl ketone \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Ethyl sec-amyl ketone; 5-methyl-3-heptanone\n\n**CAS No.:** 541855\n\n**PEL (ppm):** 25\n\n**PEL (mg/m\u00b3):** 130\n\n> 541855 | | Ethyl sec-amyl ketone; 5-methyl-3-heptanone | 25 | 130\n\nSource: \n", "cas_number": "541855", "file": "ethyl-sec-amyl-ketone-5-methyl-3-heptanone.md", "generated": true, "harvested": "2026-08-05", "id": "ethyl-sec-amyl-ketone-5-methyl-3-heptanone", "pel_mgm3": "130", "pel_ppm": "25", "source_quote": "541855 | | Ethyl sec-amyl ketone; 5-methyl-3-heptanone | 25 | 130", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Ethyl sec-amyl ketone; 5-methyl-3-heptanone", "title": "Ethyl sec-amyl ketone; 5-methyl-3-heptanone \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Ethyl silicate\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Ethyl silicate\n\n**CAS No.:** 78-10-4\n\n> CAS No. 78-10-4\n\n**NIOSH REL (ppm):** TWA 10\n\n**NIOSH REL (mg/m\u00b3):** 85\n\n> NIOSH REL TWA 10 ppm (85 mg/m3)\n\nSource: \n", "cas_number": "78-10-4", "file": "ethyl-silicate-2.md", "generated": true, "harvested": "2026-09-08", "id": "ethyl-silicate-2", "quote_cas_number": "CAS No. 78-10-4", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Ethyl silicate", "rel_mgm3": "85", "rel_ppm": "TWA 10", "source_quote": "NIOSH REL TWA 10 ppm (85 mg/m3)", "sources": ["https://www.cdc.gov/niosh/npg/npgd0282.html"], "stale_after": "2027-09-08", "substance": "Ethyl silicate", "title": "Ethyl silicate \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Ethyl silicate; tetraethyl silicate\n\n**CAS No.:** 78104\n\n**PEL (ppm):** 10\n\n**PEL (mg/m\u00b3):** 85\n\n> 78104 | | Ethyl silicate; tetraethyl silicate | 10 | 85\n\nSource: \n", "cas_number": "78104", "file": "ethyl-silicate-tetraethyl-silicate.md", "generated": true, "harvested": "2026-08-05", "id": "ethyl-silicate-tetraethyl-silicate", "pel_mgm3": "85", "pel_ppm": "10", "source_quote": "78104 | | Ethyl silicate; tetraethyl silicate | 10 | 85", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Ethyl silicate; tetraethyl silicate", "title": "Ethyl silicate; tetraethyl silicate \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Ethyl silicate\n\n**CAS No.:** 78-10-4\n\n**PEL (ppm):** 100\n\n**PEL (mg/m\u00b3):** 850\n\n> Ethyl silicate | 78-10-4 | 100 | 850 | - |\n\nSource: \n", "cas_number": "78-10-4", "file": "ethyl-silicate.md", "generated": true, "harvested": "2026-08-05", "id": "ethyl-silicate", "pel_mgm3": "850", "pel_ppm": "100", "source_quote": "Ethyl silicate | 78-10-4 | 100 | 850 | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Ethyl silicate", "title": "Ethyl silicate \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Ethyl tert-butyl ether\n\n**CAS No.:** 637923\n\n**PEL (ppm):** 5\n\n**PEL (mg/m\u00b3):** 21\n\n> 637923 | | Ethyl tert-butyl ether | 5 | 21\n\nSource: \n", "cas_number": "637923", "file": "ethyl-tert-butyl-ether.md", "generated": true, "harvested": "2026-08-05", "id": "ethyl-tert-butyl-ether", "pel_mgm3": "21", "pel_ppm": "5", "source_quote": "637923 | | Ethyl tert-butyl ether | 5 | 21", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Ethyl tert-butyl ether", "title": "Ethyl tert-butyl ether \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Ethylamine\n\n**CAS No.:** 75047\n\n**PEL (ppm):** 5\n\n**PEL (mg/m\u00b3):** 9.2\n\n**Ceiling:** C\n\n> 75047 | S | Ethylamine | 5 | 9.2 | C\n\nSource: \n", "cas_number": "75047", "ceiling": "C", "file": "ethylamine-2.md", "generated": true, "harvested": "2026-08-05", "id": "ethylamine-2", "pel_mgm3": "9.2", "pel_ppm": "5", "source_quote": "75047 | S | Ethylamine | 5 | 9.2 | C", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Ethylamine", "title": "Ethylamine \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Ethylamine\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Ethylamine\n\n**CAS No.:** 75-04-7\n\n> CAS No. 75-04-7\n\n**NIOSH REL (ppm):** TWA 10\n\n**NIOSH REL (mg/m\u00b3):** 18\n\n> NIOSH REL TWA 10 ppm (18 mg/m3)\n\nSource: \n", "cas_number": "75-04-7", "file": "ethylamine-3.md", "generated": true, "harvested": "2026-09-08", "id": "ethylamine-3", "quote_cas_number": "CAS No. 75-04-7", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Ethylamine", "rel_mgm3": "18", "rel_ppm": "TWA 10", "source_quote": "NIOSH REL TWA 10 ppm (18 mg/m3)", "sources": ["https://www.cdc.gov/niosh/npg/npgd0263.html"], "stale_after": "2027-09-08", "substance": "Ethylamine", "title": "Ethylamine \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Ethylamine\n\n**CAS No.:** 75-04-7\n\n**PEL (ppm):** 10\n\n**PEL (mg/m\u00b3):** 18\n\n> Ethylamine | 75-04-7 | 10 | 18 | - |\n\nSource: \n", "cas_number": "75-04-7", "file": "ethylamine.md", "generated": true, "harvested": "2026-08-05", "id": "ethylamine", "pel_mgm3": "18", "pel_ppm": "10", "source_quote": "Ethylamine | 75-04-7 | 10 | 18 | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Ethylamine", "title": "Ethylamine \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Ethylbenzene\n\n**CAS No.:** 100414\n\n**PEL (ppm):** 5\n\n**PEL (mg/m\u00b3):** 22\n\n**STEL (ppm):** 30\n\n**STEL (mg/m\u00b3):** 130\n\n> 100414 | | Ethylbenzene | 5 | 22 | | 30 | 130\n\nSource: \n", "cas_number": "100414", "file": "ethylbenzene.md", "generated": true, "harvested": "2026-08-05", "id": "ethylbenzene", "pel_mgm3": "22", "pel_ppm": "5", "source_quote": "100414 | | Ethylbenzene | 5 | 22 | | 30 | 130", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "stel_mgm3": "130", "stel_ppm": "30", "substance": "Ethylbenzene", "title": "Ethylbenzene \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Ethylene chlorohydrin; 2-chloroethanol\n\n**CAS No.:** 107073\n\n**PEL (ppm):** 1\n\n**PEL (mg/m\u00b3):** 3\n\n**Ceiling:** C\n\n> 107073 | S | Ethylene chlorohydrin; 2-chloroethanol | 1 | 3 | C\n\nSource: \n", "cas_number": "107073", "ceiling": "C", "file": "ethylene-chlorohydrin-2-chloroethanol.md", "generated": true, "harvested": "2026-08-05", "id": "ethylene-chlorohydrin-2-chloroethanol", "pel_mgm3": "3", "pel_ppm": "1", "source_quote": "107073 | S | Ethylene chlorohydrin; 2-chloroethanol | 1 | 3 | C", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Ethylene chlorohydrin; 2-chloroethanol", "title": "Ethylene chlorohydrin; 2-chloroethanol \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Ethylene chlorohydrin\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Ethylene chlorohydrin\n\n**CAS No.:** 107-07-3\n\n> CAS No. 107-07-3\n\n**NIOSH REL (ppm):** C 1\n\n**NIOSH REL (mg/m\u00b3):** 3\n\n> NIOSH REL C 1 ppm (3 mg/m3) [skin]\n\nSource: \n", "cas_number": "107-07-3", "file": "ethylene-chlorohydrin-2.md", "generated": true, "harvested": "2026-09-08", "id": "ethylene-chlorohydrin-2", "quote_cas_number": "CAS No. 107-07-3", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Ethylene chlorohydrin", "rel_mgm3": "3", "rel_ppm": "C 1", "source_quote": "NIOSH REL C 1 ppm (3 mg/m3) [skin]", "sources": ["https://www.cdc.gov/niosh/npg/npgd0268.html"], "stale_after": "2027-09-08", "substance": "Ethylene chlorohydrin", "title": "Ethylene chlorohydrin \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Ethylene chlorohydrin\n\n**CAS No.:** 107-07-3\n\n**PEL (ppm):** 5\n\n**PEL (mg/m\u00b3):** 16\n\n> Ethylene chlorohydrin | 107-07-3 | 5 | 16 | X |\n\nSource: \n", "cas_number": "107-07-3", "file": "ethylene-chlorohydrin.md", "generated": true, "harvested": "2026-08-05", "id": "ethylene-chlorohydrin", "pel_mgm3": "16", "pel_ppm": "5", "source_quote": "Ethylene chlorohydrin | 107-07-3 | 5 | 16 | X |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Ethylene chlorohydrin", "title": "Ethylene chlorohydrin \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Ethylene dibromide; 1,2-dibromoethane, see Section 5219\n\n**CAS No.:** 106934\n\n**PEL (ppm):** 0.13\n\n**PEL (mg/m\u00b3):** 1\n\n**Ceiling:** C\n\n> 106934 | S | Ethylene dibromide; 1,2-dibromoethane, see Section 5219 | 0.13 | 1 | C\n\nSource: \n", "cas_number": "106934", "ceiling": "C", "file": "ethylene-dibromide-1-2-dibromoethane-see-section-5219.md", "generated": true, "harvested": "2026-08-05", "id": "ethylene-dibromide-1-2-dibromoethane-see-section-5219", "pel_mgm3": "1", "pel_ppm": "0.13", "source_quote": "106934 | S | Ethylene dibromide; 1,2-dibromoethane, see Section 5219 | 0.13 | 1 | C", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Ethylene dibromide; 1,2-dibromoethane, see Section 5219", "title": "Ethylene dibromide; 1,2-dibromoethane, see Section 5219 \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Ethylene dibromide\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Ethylene dibromide\n\n**CAS No.:** 106-93-4\n\n> CAS No. 106-93-4\n\n**NIOSH REL (ppm):** TWA 0.045\n\n> NIOSH REL Ca TWA 0.045 ppm C 0.13 ppm [15-minute]\n\nSource: \n", "cas_number": "106-93-4", "file": "ethylene-dibromide-2.md", "generated": true, "harvested": "2026-09-08", "id": "ethylene-dibromide-2", "quote_cas_number": "CAS No. 106-93-4", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Ethylene dibromide", "rel_ppm": "TWA 0.045", "source_quote": "NIOSH REL Ca TWA 0.045 ppm C 0.13 ppm [15-minute]", "sources": ["https://www.cdc.gov/niosh/npg/npgd0270.html"], "stale_after": "2027-09-08", "substance": "Ethylene dibromide", "title": "Ethylene dibromide \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Ethylene dibromide\n\n**CAS No.:** 106-93-4\n\n> Ethylene dibromide | 106-93-4 | - | (2) | - |\n\nSource: \n", "cas_number": "106-93-4", "file": "ethylene-dibromide.md", "generated": true, "harvested": "2026-08-05", "id": "ethylene-dibromide", "source_quote": "Ethylene dibromide | 106-93-4 | - | (2) | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Ethylene dibromide", "title": "Ethylene dibromide \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Ethylene dichloride; 1,2-dichloroethane\n\n**CAS No.:** 107062\n\n**PEL (ppm):** 1\n\n**PEL (mg/m\u00b3):** 4\n\n**Ceiling:** 200 ppm\n\n**STEL (ppm):** 2\n\n**STEL (mg/m\u00b3):** 8\n\n> 107062 | | Ethylene dichloride; 1,2-dichloroethane | 1 | 4 | 200 ppm | 2 | 8\n\nSource: \n", "cas_number": "107062", "ceiling": "200 ppm", "file": "ethylene-dichloride-1-2-dichloroethane-2.md", "generated": true, "harvested": "2026-08-05", "id": "ethylene-dichloride-1-2-dichloroethane-2", "pel_mgm3": "4", "pel_ppm": "1", "source_quote": "107062 | | Ethylene dichloride; 1,2-dichloroethane | 1 | 4 | 200 ppm | 2 | 8", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "stel_mgm3": "8", "stel_ppm": "2", "substance": "Ethylene dichloride; 1,2-dichloroethane", "title": "Ethylene dichloride; 1,2-dichloroethane \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Ethylene dichloride (1,2-Dichloroethane)\n\n**CAS No.:** 107-06-2\n\n> Ethylene dichloride (1,2-Dichloroethane) | 107-06-2 | - | (2) | - |\n\nSource: \n", "cas_number": "107-06-2", "file": "ethylene-dichloride-1-2-dichloroethane.md", "generated": true, "harvested": "2026-08-05", "id": "ethylene-dichloride-1-2-dichloroethane", "source_quote": "Ethylene dichloride (1,2-Dichloroethane) | 107-06-2 | - | (2) | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Ethylene dichloride (1,2-Dichloroethane)", "title": "Ethylene dichloride (1,2-Dichloroethane) \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Ethylene dichloride\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Ethylene dichloride\n\n**CAS No.:** 107-06-2\n\n> CAS No. 107-06-2\n\n**NIOSH REL (ppm):** TWA 1\n\n**NIOSH REL (mg/m\u00b3):** 4\n\n> NIOSH REL Ca TWA 1 ppm (4 mg/m3) ST 2 ppm (8 mg/m3)\n\nSource: \n", "cas_number": "107-06-2", "file": "ethylene-dichloride.md", "generated": true, "harvested": "2026-09-08", "id": "ethylene-dichloride", "quote_cas_number": "CAS No. 107-06-2", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Ethylene dichloride", "rel_mgm3": "4", "rel_ppm": "TWA 1", "source_quote": "NIOSH REL Ca TWA 1 ppm (4 mg/m3) ST 2 ppm (8 mg/m3)", "sources": ["https://www.cdc.gov/niosh/npg/npgd0271.html"], "stale_after": "2027-09-08", "substance": "Ethylene dichloride", "title": "Ethylene dichloride \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Ethylene glycol diethyl ether, 1,2-diethoxyethane\n\n**CAS No.:** 629141\n\n**PEL (ppm):** 5\n\n**PEL (mg/m\u00b3):** 24\n\n> 629141 | S | Ethylene glycol diethyl ether, 1,2-diethoxyethane | 5 | 24\n\nSource: \n", "cas_number": "629141", "file": "ethylene-glycol-diethyl-ether-1-2-diethoxyethane.md", "generated": true, "harvested": "2026-08-05", "id": "ethylene-glycol-diethyl-ether-1-2-diethoxyethane", "pel_mgm3": "24", "pel_ppm": "5", "source_quote": "629141 | S | Ethylene glycol diethyl ether, 1,2-diethoxyethane | 5 | 24", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Ethylene glycol diethyl ether, 1,2-diethoxyethane", "title": "Ethylene glycol diethyl ether, 1,2-diethoxyethane \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Ethylene glycol dimethyl ether, 1,2-dimethoxyethane, Glyme\n\n**CAS No.:** 110714\n\n**PEL (ppm):** 1\n\n**PEL (mg/m\u00b3):** 3.7\n\n**STEL (ppm):** 5\n\n**STEL (mg/m\u00b3):** 18\n\n> 110714 | S | Ethylene glycol dimethyl ether, 1,2-dimethoxyethane, Glyme | 1 | 3.7 | | 5 | 18\n\nSource: \n", "cas_number": "110714", "file": "ethylene-glycol-dimethyl-ether-1-2-dimethoxyethane-glyme.md", "generated": true, "harvested": "2026-08-05", "id": "ethylene-glycol-dimethyl-ether-1-2-dimethoxyethane-glyme", "pel_mgm3": "3.7", "pel_ppm": "1", "source_quote": "110714 | S | Ethylene glycol dimethyl ether, 1,2-dimethoxyethane, Glyme | 1 | 3.7 | | 5 | 18", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "stel_mgm3": "18", "stel_ppm": "5", "substance": "Ethylene glycol dimethyl ether, 1,2-dimethoxyethane, Glyme", "title": "Ethylene glycol dimethyl ether, 1,2-dimethoxyethane, Glyme \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Ethylene glycol dinitrate\n\n**CAS No.:** 628966\n\n**STEL (mg/m\u00b3):** 0.1\n\n> 628966 | S | Ethylene glycol dinitrate | | (k) | | -- | 0.1\n\nSource: \n", "cas_number": "628966", "file": "ethylene-glycol-dinitrate-2.md", "generated": true, "harvested": "2026-08-05", "id": "ethylene-glycol-dinitrate-2", "source_quote": "628966 | S | Ethylene glycol dinitrate | | (k) | | -- | 0.1", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "stel_mgm3": "0.1", "substance": "Ethylene glycol dinitrate", "title": "Ethylene glycol dinitrate \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Ethylene glycol dinitrate\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Ethylene glycol dinitrate\n\n**CAS No.:** 628-96-6\n\n> CAS No. 628-96-6\n\n**NIOSH REL (mg/m\u00b3):** ST 0.1\n\n> NIOSH REL ST 0.1 mg/m3 [skin]\n\nSource: \n", "cas_number": "628-96-6", "file": "ethylene-glycol-dinitrate-3.md", "generated": true, "harvested": "2026-09-08", "id": "ethylene-glycol-dinitrate-3", "quote_cas_number": "CAS No. 628-96-6", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Ethylene glycol dinitrate", "rel_mgm3": "ST 0.1", "source_quote": "NIOSH REL ST 0.1 mg/m3 [skin]", "sources": ["https://www.cdc.gov/niosh/npg/npgd0273.html"], "stale_after": "2027-09-08", "substance": "Ethylene glycol dinitrate", "title": "Ethylene glycol dinitrate \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Ethylene glycol dinitrate\n\n**CAS No.:** 628-96-6\n\n**PEL (ppm):** (C)0.2\n\n**PEL (mg/m\u00b3):** (C)1\n\n> Ethylene glycol dinitrate | 628-96-6 | (C)0.2 | (C)1 | X |\n\nSource: \n", "cas_number": "628-96-6", "file": "ethylene-glycol-dinitrate.md", "generated": true, "harvested": "2026-08-05", "id": "ethylene-glycol-dinitrate", "pel_mgm3": "(C)1", "pel_ppm": "(C)0.2", "source_quote": "Ethylene glycol dinitrate | 628-96-6 | (C)0.2 | (C)1 | X |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Ethylene glycol dinitrate", "title": "Ethylene glycol dinitrate \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Ethylene glycol monoethyl ether, see 2-Ethoxyethanol\n\n**CAS No.:** 110805\n\n> 110805 | S | Ethylene glycol monoethyl ether, see 2-Ethoxyethanol\n\nSource: \n", "cas_number": "110805", "file": "ethylene-glycol-monoethyl-ether-see-2-ethoxyethanol.md", "generated": true, "harvested": "2026-08-05", "id": "ethylene-glycol-monoethyl-ether-see-2-ethoxyethanol", "source_quote": "110805 | S | Ethylene glycol monoethyl ether, see 2-Ethoxyethanol", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Ethylene glycol monoethyl ether, see 2-Ethoxyethanol", "title": "Ethylene glycol monoethyl ether, see 2-Ethoxyethanol \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Ethylene glycol monomethyl ether acetate; see 2-Methoxyethyl acetate\n\n**CAS No.:** 110496\n\n> 110496 | S | Ethylene glycol monomethyl ether acetate; see 2-Methoxyethyl acetate\n\nSource: \n", "cas_number": "110496", "file": "ethylene-glycol-monomethyl-ether-acetate-see-2-methoxyethyl-acetate.md", "generated": true, "harvested": "2026-08-05", "id": "ethylene-glycol-monomethyl-ether-acetate-see-2-methoxyethyl-acetate", "source_quote": "110496 | S | Ethylene glycol monomethyl ether acetate; see 2-Methoxyethyl acetate", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Ethylene glycol monomethyl ether acetate; see 2-Methoxyethyl acetate", "title": "Ethylene glycol monomethyl ether acetate; see 2-Methoxyethyl acetate \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Ethylene glycol monomethyl ether, see 2-Methoxyethanol\n\n**CAS No.:** 109864\n\n> 109864 | S | Ethylene glycol monomethyl ether, see 2-Methoxyethanol\n\nSource: \n", "cas_number": "109864", "file": "ethylene-glycol-monomethyl-ether-see-2-methoxyethanol.md", "generated": true, "harvested": "2026-08-05", "id": "ethylene-glycol-monomethyl-ether-see-2-methoxyethanol", "source_quote": "109864 | S | Ethylene glycol monomethyl ether, see 2-Methoxyethanol", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Ethylene glycol monomethyl ether, see 2-Methoxyethanol", "title": "Ethylene glycol monomethyl ether, see 2-Methoxyethanol \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Ethylene glycol (vapor)\n\n**CAS No.:** 107211\n\n**PEL (ppm):** 40\n\n**PEL (mg/m\u00b3):** 100\n\n**Ceiling:** C\n\n> 107211 | | Ethylene glycol (vapor) | 40 | 100 | C\n\nSource: \n", "cas_number": "107211", "ceiling": "C", "file": "ethylene-glycol-vapor.md", "generated": true, "harvested": "2026-08-05", "id": "ethylene-glycol-vapor", "pel_mgm3": "100", "pel_ppm": "40", "source_quote": "107211 | | Ethylene glycol (vapor) | 40 | 100 | C", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Ethylene glycol (vapor)", "title": "Ethylene glycol (vapor) \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Ethylene glycol\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Ethylene glycol\n\n**CAS No.:** 107-21-1\n\n> CAS No. 107-21-1\n\n**NIOSH REL, as stated:** See Appendix D\n\n> NIOSH REL See Appendix D\n\nSource: \n", "cas_number": "107-21-1", "file": "ethylene-glycol.md", "generated": true, "harvested": "2026-09-08", "id": "ethylene-glycol", "quote_cas_number": "CAS No. 107-21-1", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Ethylene glycol", "rel_statement": "See Appendix D", "source_quote": "NIOSH REL See Appendix D", "sources": ["https://www.cdc.gov/niosh/npg/npgd0272.html"], "stale_after": "2027-09-08", "substance": "Ethylene glycol", "title": "Ethylene glycol \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Ethylene oxide; see 1910.1047\n\n**CAS No.:** 75-21-8\n\n> Ethylene oxide; see 1910.1047 | 75-21-8 | - | - | - |\n\nSource: \n", "cas_number": "75-21-8", "file": "ethylene-oxide-see-1910-1047.md", "generated": true, "harvested": "2026-08-05", "id": "ethylene-oxide-see-1910-1047", "source_quote": "Ethylene oxide; see 1910.1047 | 75-21-8 | - | - | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Ethylene oxide; see 1910.1047", "title": "Ethylene oxide; see 1910.1047 \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Ethylene oxide; see Section 5220\n\n**CAS No.:** 75218\n\n**PEL (ppm):** 1\n\n**PEL (mg/m\u00b3):** 2\n\n**STEL (ppm):** 5\n\n> 75218 | | Ethylene oxide; see Section 5220 | 1 | 2 | | 5\n\nSource: \n", "cas_number": "75218", "file": "ethylene-oxide-see-section-5220.md", "generated": true, "harvested": "2026-08-05", "id": "ethylene-oxide-see-section-5220", "pel_mgm3": "2", "pel_ppm": "1", "source_quote": "75218 | | Ethylene oxide; see Section 5220 | 1 | 2 | | 5", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "stel_ppm": "5", "substance": "Ethylene oxide; see Section 5220", "title": "Ethylene oxide; see Section 5220 \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Ethylene oxide\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Ethylene oxide\n\n**CAS No.:** 75-21-8\n\n> CAS No. 75-21-8\n\n**NIOSH REL (ppm):** C 5\n\n**NIOSH REL (mg/m\u00b3):** 9\n\n> NIOSH REL Ca TWA <0.1 ppm (0.18 mg/m3) C 5 ppm (9 mg/m3) [10-min/day]\n\nSource: \n", "cas_number": "75-21-8", "file": "ethylene-oxide.md", "generated": true, "harvested": "2026-09-08", "id": "ethylene-oxide", "quote_cas_number": "CAS No. 75-21-8", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Ethylene oxide", "rel_mgm3": "9", "rel_ppm": "C 5", "source_quote": "NIOSH REL Ca TWA <0.1 ppm (0.18 mg/m3) C 5 ppm (9 mg/m3) [10-min/day]", "sources": ["https://www.cdc.gov/niosh/npg/npgd0275.html"], "stale_after": "2027-09-08", "substance": "Ethylene oxide", "title": "Ethylene oxide \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Ethylene thiourea\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Ethylene thiourea\n\n**CAS No.:** 96-45-7\n\n> CAS No. 96-45-7\n\n**NIOSH REL, as stated:** Ca Use encapsulated form. See Appendix A\n\n> NIOSH REL Ca Use encapsulated form. See Appendix A\n\nSource: \n", "cas_number": "96-45-7", "file": "ethylene-thiourea.md", "generated": true, "harvested": "2026-09-08", "id": "ethylene-thiourea", "quote_cas_number": "CAS No. 96-45-7", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Ethylene thiourea", "rel_statement": "Ca Use encapsulated form. See Appendix A", "source_quote": "NIOSH REL Ca Use encapsulated form. See Appendix A", "sources": ["https://www.cdc.gov/niosh/npg/npgd0276.html"], "stale_after": "2027-09-08", "substance": "Ethylene thiourea", "title": "Ethylene thiourea \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Ethylene\n\n**CAS No.:** 74851\n\n> 74851 | | Ethylene | (h) | --\n\nSource: \n", "cas_number": "74851", "file": "ethylene.md", "generated": true, "harvested": "2026-08-05", "id": "ethylene", "source_quote": "74851 | | Ethylene | (h) | --", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Ethylene", "title": "Ethylene \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Ethylenediamine; 1,2-diaminoethane\n\n**CAS No.:** 107153\n\n**PEL (ppm):** 10\n\n**PEL (mg/m\u00b3):** 25\n\n> 107153 | | Ethylenediamine; 1,2-diaminoethane | 10 | 25\n\nSource: \n", "cas_number": "107153", "file": "ethylenediamine-1-2-diaminoethane.md", "generated": true, "harvested": "2026-08-05", "id": "ethylenediamine-1-2-diaminoethane", "pel_mgm3": "25", "pel_ppm": "10", "source_quote": "107153 | | Ethylenediamine; 1,2-diaminoethane | 10 | 25", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Ethylenediamine; 1,2-diaminoethane", "title": "Ethylenediamine; 1,2-diaminoethane \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Ethylenediamine\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Ethylenediamine\n\n**CAS No.:** 107-15-3\n\n> CAS No. 107-15-3\n\n**NIOSH REL (ppm):** TWA 10\n\n**NIOSH REL (mg/m\u00b3):** 25\n\n> NIOSH REL TWA 10 ppm (25 mg/m3)\n\nSource: \n", "cas_number": "107-15-3", "file": "ethylenediamine-2.md", "generated": true, "harvested": "2026-09-08", "id": "ethylenediamine-2", "quote_cas_number": "CAS No. 107-15-3", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Ethylenediamine", "rel_mgm3": "25", "rel_ppm": "TWA 10", "source_quote": "NIOSH REL TWA 10 ppm (25 mg/m3)", "sources": ["https://www.cdc.gov/niosh/npg/npgd0269.html"], "stale_after": "2027-09-08", "substance": "Ethylenediamine", "title": "Ethylenediamine \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Ethylenediamine\n\n**CAS No.:** 107-15-3\n\n**PEL (ppm):** 10\n\n**PEL (mg/m\u00b3):** 25\n\n> Ethylenediamine | 107-15-3 | 10 | 25 | - |\n\nSource: \n", "cas_number": "107-15-3", "file": "ethylenediamine.md", "generated": true, "harvested": "2026-08-05", "id": "ethylenediamine", "pel_mgm3": "25", "pel_ppm": "10", "source_quote": "Ethylenediamine | 107-15-3 | 10 | 25 | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Ethylenediamine", "title": "Ethylenediamine \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Ethyleneimine; see 1910.1012\n\n**CAS No.:** 151-56-4\n\n> Ethyleneimine; see 1910.1012 | 151-56-4 | - | - | - |\n\nSource: \n", "cas_number": "151-56-4", "file": "ethyleneimine-see-1910-1012.md", "generated": true, "harvested": "2026-08-05", "id": "ethyleneimine-see-1910-1012", "source_quote": "Ethyleneimine; see 1910.1012 | 151-56-4 | - | - | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Ethyleneimine; see 1910.1012", "title": "Ethyleneimine; see 1910.1012 \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Ethyleneimine; see also Section 5209\n\n**CAS No.:** 151564\n\n**PEL (ppm):** 0.5\n\n**PEL (mg/m\u00b3):** 1\n\n> 151564 | S | Ethyleneimine; see also Section 5209 | 0.5 | 1\n\nSource: \n", "cas_number": "151564", "file": "ethyleneimine-see-also-section-5209.md", "generated": true, "harvested": "2026-08-05", "id": "ethyleneimine-see-also-section-5209", "pel_mgm3": "1", "pel_ppm": "0.5", "source_quote": "151564 | S | Ethyleneimine; see also Section 5209 | 0.5 | 1", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Ethyleneimine; see also Section 5209", "title": "Ethyleneimine; see also Section 5209 \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Ethyleneimine\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Ethyleneimine\n\n**CAS No.:** 151-56-4\n\n> CAS No. 151-56-4\n\n**NIOSH REL, as stated:** Ca See Appendix A\n\n> NIOSH REL Ca See Appendix A\n\nSource: \n", "cas_number": "151-56-4", "file": "ethyleneimine.md", "generated": true, "harvested": "2026-09-08", "id": "ethyleneimine", "quote_cas_number": "CAS No. 151-56-4", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Ethyleneimine", "rel_statement": "Ca See Appendix A", "source_quote": "NIOSH REL Ca See Appendix A", "sources": ["https://www.cdc.gov/niosh/npg/npgd0274.html"], "stale_after": "2027-09-08", "substance": "Ethyleneimine", "title": "Ethyleneimine \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Ethylidene chloride; see 1,1-Dichloroethane\n\n**CAS No.:** 75343\n\n> 75343 | | Ethylidene chloride; see 1,1-Dichloroethane\n\nSource: \n", "cas_number": "75343", "file": "ethylidene-chloride-see-1-1-dichloroethane.md", "generated": true, "harvested": "2026-08-05", "id": "ethylidene-chloride-see-1-1-dichloroethane", "source_quote": "75343 | | Ethylidene chloride; see 1,1-Dichloroethane", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Ethylidene chloride; see 1,1-Dichloroethane", "title": "Ethylidene chloride; see 1,1-Dichloroethane \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Ethylidene norbornene\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Ethylidene norbornene\n\n**CAS No.:** 16219-75-3\n\n> CAS No. 16219-75-3\n\n**NIOSH REL (ppm):** C 5\n\n**NIOSH REL (mg/m\u00b3):** 25\n\n> NIOSH REL C 5 ppm (25 mg/m3)\n\nSource: \n", "cas_number": "16219-75-3", "file": "ethylidene-norbornene-2.md", "generated": true, "harvested": "2026-09-08", "id": "ethylidene-norbornene-2", "quote_cas_number": "CAS No. 16219-75-3", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Ethylidene norbornene", "rel_mgm3": "25", "rel_ppm": "C 5", "source_quote": "NIOSH REL C 5 ppm (25 mg/m3)", "sources": ["https://www.cdc.gov/niosh/npg/npgd0279.html"], "stale_after": "2027-09-08", "substance": "Ethylidene norbornene", "title": "Ethylidene norbornene \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Ethylidene norbornene\n\n**CAS No.:** 16219753\n\n**PEL (ppm):** 5\n\n**PEL (mg/m\u00b3):** 25\n\n**Ceiling:** C\n\n> 16219753 | | Ethylidene norbornene | 5 | 25 | C\n\nSource: \n", "cas_number": "16219753", "ceiling": "C", "file": "ethylidene-norbornene.md", "generated": true, "harvested": "2026-08-05", "id": "ethylidene-norbornene", "pel_mgm3": "25", "pel_ppm": "5", "source_quote": "16219753 | | Ethylidene norbornene | 5 | 25 | C", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Ethylidene norbornene", "title": "Ethylidene norbornene \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Fenamiphos\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Fenamiphos\n\n**CAS No.:** 22224-92-6\n\n> CAS No. 22224-92-6\n\n**NIOSH REL (mg/m\u00b3):** TWA 0.1\n\n> NIOSH REL TWA 0.1 mg/m3 [skin]\n\nSource: \n", "cas_number": "22224-92-6", "file": "fenamiphos-2.md", "generated": true, "harvested": "2026-09-08", "id": "fenamiphos-2", "quote_cas_number": "CAS No. 22224-92-6", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Fenamiphos", "rel_mgm3": "TWA 0.1", "source_quote": "NIOSH REL TWA 0.1 mg/m3 [skin]", "sources": ["https://www.cdc.gov/niosh/npg/npgd0283.html"], "stale_after": "2027-09-08", "substance": "Fenamiphos", "title": "Fenamiphos \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Fenamiphos\n\n**CAS No.:** 22224926\n\n**PEL (mg/m\u00b3):** 0.1\n\n> 22224926 | S | Fenamiphos | | 0.1\n\nSource: \n", "cas_number": "22224926", "file": "fenamiphos.md", "generated": true, "harvested": "2026-08-05", "id": "fenamiphos", "pel_mgm3": "0.1", "source_quote": "22224926 | S | Fenamiphos | | 0.1", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Fenamiphos", "title": "Fenamiphos \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Fensulfothion\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Fensulfothion\n\n**CAS No.:** 115-90-2\n\n> CAS No. 115-90-2\n\n**NIOSH REL (mg/m\u00b3):** TWA 0.1\n\n> NIOSH REL TWA 0.1 mg/m3\n\nSource: \n", "cas_number": "115-90-2", "file": "fensulfothion-2.md", "generated": true, "harvested": "2026-09-08", "id": "fensulfothion-2", "quote_cas_number": "CAS No. 115-90-2", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Fensulfothion", "rel_mgm3": "TWA 0.1", "source_quote": "NIOSH REL TWA 0.1 mg/m3", "sources": ["https://www.cdc.gov/niosh/npg/npgd0284.html"], "stale_after": "2027-09-08", "substance": "Fensulfothion", "title": "Fensulfothion \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Fensulfothion\n\n**CAS No.:** 115902\n\n**PEL (mg/m\u00b3):** 0.1\n\n> 115902 | | Fensulfothion | -- | 0.1\n\nSource: \n", "cas_number": "115902", "file": "fensulfothion.md", "generated": true, "harvested": "2026-08-05", "id": "fensulfothion", "pel_mgm3": "0.1", "source_quote": "115902 | | Fensulfothion | -- | 0.1", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Fensulfothion", "title": "Fensulfothion \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Fenthion\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Fenthion\n\n**CAS No.:** 55-38-9\n\n> CAS No. 55-38-9\n\n**NIOSH REL, as stated:** See Appendix D\n\n> NIOSH REL See Appendix D\n\nSource: \n", "cas_number": "55-38-9", "file": "fenthion-2.md", "generated": true, "harvested": "2026-09-08", "id": "fenthion-2", "quote_cas_number": "CAS No. 55-38-9", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Fenthion", "rel_statement": "See Appendix D", "source_quote": "NIOSH REL See Appendix D", "sources": ["https://www.cdc.gov/niosh/npg/npgd0285.html"], "stale_after": "2027-09-08", "substance": "Fenthion", "title": "Fenthion \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Fenthion\n\n**CAS No.:** 55389\n\n**PEL (mg/m\u00b3):** 0.2\n\n> 55389 | S | Fenthion | -- | 0.2\n\nSource: \n", "cas_number": "55389", "file": "fenthion.md", "generated": true, "harvested": "2026-08-05", "id": "fenthion", "pel_mgm3": "0.2", "source_quote": "55389 | S | Fenthion | -- | 0.2", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Fenthion", "title": "Fenthion \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Ferbam\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Ferbam\n\n**CAS No.:** 14484-64-1\n\n> CAS No. 14484-64-1\n\n**NIOSH REL (mg/m\u00b3):** TWA 10\n\n> NIOSH REL TWA 10 mg/m3\n\nSource: \n", "cas_number": "14484-64-1", "file": "ferbam-2.md", "generated": true, "harvested": "2026-09-08", "id": "ferbam-2", "quote_cas_number": "CAS No. 14484-64-1", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Ferbam", "rel_mgm3": "TWA 10", "source_quote": "NIOSH REL TWA 10 mg/m3", "sources": ["https://www.cdc.gov/niosh/npg/npgd0286.html"], "stale_after": "2027-09-08", "substance": "Ferbam", "title": "Ferbam \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Ferbam; ferric N,N-dimethylthiocarbamate\n\n**CAS No.:** 14484641\n\n**PEL (mg/m\u00b3):** 10\n\n> 14484641 | | Ferbam; ferric N,N-dimethylthiocarbamate | -- | 10\n\nSource: \n", "cas_number": "14484641", "file": "ferbam-ferric-n-n-dimethylthiocarbamate.md", "generated": true, "harvested": "2026-08-05", "id": "ferbam-ferric-n-n-dimethylthiocarbamate", "pel_mgm3": "10", "source_quote": "14484641 | | Ferbam; ferric N,N-dimethylthiocarbamate | -- | 10", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Ferbam; ferric N,N-dimethylthiocarbamate", "title": "Ferbam; ferric N,N-dimethylthiocarbamate \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Ferbam\n\n**CAS No.:** 14484-64-1\n\n> Ferbam | 14484-64-1 | - | - | - |\n\nSource: \n", "cas_number": "14484-64-1", "file": "ferbam.md", "generated": true, "harvested": "2026-08-05", "id": "ferbam", "source_quote": "Ferbam | 14484-64-1 | - | - | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Ferbam", "title": "Ferbam \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Ferrovanadium dust\n\n**CAS No.:** 12604589\n\n**PEL (mg/m\u00b3):** 1\n\n**STEL (mg/m\u00b3):** 3\n\n> 12604589 | | Ferrovanadium dust | -- | 1 | | -- | 3\n\nSource: \n", "cas_number": "12604589", "file": "ferrovanadium-dust-2.md", "generated": true, "harvested": "2026-08-05", "id": "ferrovanadium-dust-2", "pel_mgm3": "1", "source_quote": "12604589 | | Ferrovanadium dust | -- | 1 | | -- | 3", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "stel_mgm3": "3", "substance": "Ferrovanadium dust", "title": "Ferrovanadium dust \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Ferrovanadium dust\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Ferrovanadium dust\n\n**CAS No.:** 12604-58-9\n\n> CAS No. 12604-58-9\n\n**NIOSH REL (mg/m\u00b3):** TWA 1\n\n> NIOSH REL TWA 1 mg/m3 ST 3 mg/m3\n\nSource: \n", "cas_number": "12604-58-9", "file": "ferrovanadium-dust-3.md", "generated": true, "harvested": "2026-09-08", "id": "ferrovanadium-dust-3", "quote_cas_number": "CAS No. 12604-58-9", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Ferrovanadium dust", "rel_mgm3": "TWA 1", "source_quote": "NIOSH REL TWA 1 mg/m3 ST 3 mg/m3", "sources": ["https://www.cdc.gov/niosh/npg/npgd0287.html"], "stale_after": "2027-09-08", "substance": "Ferrovanadium dust", "title": "Ferrovanadium dust \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Ferrovanadium dust\n\n**CAS No.:** 12604-58-9\n\n**PEL (mg/m\u00b3):** 1\n\n> Ferrovanadium dust | 12604-58-9 | - | 1 | - |\n\nSource: \n", "cas_number": "12604-58-9", "file": "ferrovanadium-dust.md", "generated": true, "harvested": "2026-08-05", "id": "ferrovanadium-dust", "pel_mgm3": "1", "source_quote": "Ferrovanadium dust | 12604-58-9 | - | 1 | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Ferrovanadium dust", "title": "Ferrovanadium dust \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Fibrous glass, see Glass\n\n**CAS No.:** 14808607\n\n> 14808607 | | Fibrous glass, see Glass\n\nSource: \n", "cas_number": "14808607", "file": "fibrous-glass-see-glass.md", "generated": true, "harvested": "2026-08-05", "id": "fibrous-glass-see-glass", "source_quote": "14808607 | | Fibrous glass, see Glass", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Fibrous glass, see Glass", "title": "Fibrous glass, see Glass \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Fluorine\n\n**CAS No.:** 7782414\n\n**PEL (ppm):** 0.1\n\n**PEL (mg/m\u00b3):** 0.2\n\n> 7782414 | | Fluorine | 0.1 | 0.2\n\nSource: \n", "cas_number": "7782414", "file": "fluorine-2.md", "generated": true, "harvested": "2026-08-05", "id": "fluorine-2", "pel_mgm3": "0.2", "pel_ppm": "0.1", "source_quote": "7782414 | | Fluorine | 0.1 | 0.2", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Fluorine", "title": "Fluorine \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Fluorine\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Fluorine\n\n**CAS No.:** 7782-41-4\n\n> CAS No. 7782-41-4\n\n**NIOSH REL (ppm):** TWA 0.1\n\n**NIOSH REL (mg/m\u00b3):** 0.2\n\n> NIOSH REL TWA 0.1 ppm (0.2 mg/m3)\n\nSource: \n", "cas_number": "7782-41-4", "file": "fluorine-3.md", "generated": true, "harvested": "2026-09-08", "id": "fluorine-3", "quote_cas_number": "CAS No. 7782-41-4", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Fluorine", "rel_mgm3": "0.2", "rel_ppm": "TWA 0.1", "source_quote": "NIOSH REL TWA 0.1 ppm (0.2 mg/m3)", "sources": ["https://www.cdc.gov/niosh/npg/npgd0289.html"], "stale_after": "2027-09-08", "substance": "Fluorine", "title": "Fluorine \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Fluorine\n\n**CAS No.:** 7782-41-4\n\n**PEL (ppm):** 0.1\n\n**PEL (mg/m\u00b3):** 0.2\n\n> Fluorine | 7782-41-4 | 0.1 | 0.2 | - |\n\nSource: \n", "cas_number": "7782-41-4", "file": "fluorine.md", "generated": true, "harvested": "2026-08-05", "id": "fluorine", "pel_mgm3": "0.2", "pel_ppm": "0.1", "source_quote": "Fluorine | 7782-41-4 | 0.1 | 0.2 | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Fluorine", "title": "Fluorine \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Fluorocarbon 11; see Trichlorofluoromethane\n\n**CAS No.:** 75694\n\n> 75694 | | Fluorocarbon 11; see Trichlorofluoromethane\n\nSource: \n", "cas_number": "75694", "file": "fluorocarbon-11-see-trichlorofluoromethane.md", "generated": true, "harvested": "2026-08-05", "id": "fluorocarbon-11-see-trichlorofluoromethane", "source_quote": "75694 | | Fluorocarbon 11; see Trichlorofluoromethane", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Fluorocarbon 11; see Trichlorofluoromethane", "title": "Fluorocarbon 11; see Trichlorofluoromethane \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Fluorocarbon 112; see 1,1,2,2-Tetrachloro-1,2-difluoroethane\n\n**CAS No.:** 76120\n\n> 76120 | | Fluorocarbon 112; see 1,1,2,2-Tetrachloro-1,2-difluoroethane\n\nSource: \n", "cas_number": "76120", "file": "fluorocarbon-112-see-1-1-2-2-tetrachloro-1-2-difluoroethane.md", "generated": true, "harvested": "2026-08-05", "id": "fluorocarbon-112-see-1-1-2-2-tetrachloro-1-2-difluoroethane", "source_quote": "76120 | | Fluorocarbon 112; see 1,1,2,2-Tetrachloro-1,2-difluoroethane", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Fluorocarbon 112; see 1,1,2,2-Tetrachloro-1,2-difluoroethane", "title": "Fluorocarbon 112; see 1,1,2,2-Tetrachloro-1,2-difluoroethane \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Fluorocarbon 113; see 1,1,2-Trichloro-1,2,2-trifluoroethane\n\n**CAS No.:** 76131\n\n> 76131 | | Fluorocarbon 113; see 1,1,2-Trichloro-1,2,2-trifluoroethane\n\nSource: \n", "cas_number": "76131", "file": "fluorocarbon-113-see-1-1-2-trichloro-1-2-2-trifluoroethane.md", "generated": true, "harvested": "2026-08-05", "id": "fluorocarbon-113-see-1-1-2-trichloro-1-2-2-trifluoroethane", "source_quote": "76131 | | Fluorocarbon 113; see 1,1,2-Trichloro-1,2,2-trifluoroethane", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Fluorocarbon 113; see 1,1,2-Trichloro-1,2,2-trifluoroethane", "title": "Fluorocarbon 113; see 1,1,2-Trichloro-1,2,2-trifluoroethane \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Fluorocarbon 12; see Dichlorodifluoromethane\n\n**CAS No.:** 75718\n\n> 75718 | | Fluorocarbon 12; see Dichlorodifluoromethane\n\nSource: \n", "cas_number": "75718", "file": "fluorocarbon-12-see-dichlorodifluoromethane.md", "generated": true, "harvested": "2026-08-05", "id": "fluorocarbon-12-see-dichlorodifluoromethane", "source_quote": "75718 | | Fluorocarbon 12; see Dichlorodifluoromethane", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Fluorocarbon 12; see Dichlorodifluoromethane", "title": "Fluorocarbon 12; see Dichlorodifluoromethane \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Fluorocarbon 21; see Dichlorofluoromethane\n\n**CAS No.:** 75434\n\n> 75434 | | Fluorocarbon 21; see Dichlorofluoromethane\n\nSource: \n", "cas_number": "75434", "file": "fluorocarbon-21-see-dichlorofluoromethane.md", "generated": true, "harvested": "2026-08-05", "id": "fluorocarbon-21-see-dichlorofluoromethane", "source_quote": "75434 | | Fluorocarbon 21; see Dichlorofluoromethane", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Fluorocarbon 21; see Dichlorofluoromethane", "title": "Fluorocarbon 21; see Dichlorofluoromethane \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Fluorocarbon 22; see Chlorodifluoromethane\n\n**CAS No.:** 75456\n\n> 75456 | | Fluorocarbon 22; see Chlorodifluoromethane\n\nSource: \n", "cas_number": "75456", "file": "fluorocarbon-22-see-chlorodifluoromethane.md", "generated": true, "harvested": "2026-08-05", "id": "fluorocarbon-22-see-chlorodifluoromethane", "source_quote": "75456 | | Fluorocarbon 22; see Chlorodifluoromethane", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Fluorocarbon 22; see Chlorodifluoromethane", "title": "Fluorocarbon 22; see Chlorodifluoromethane \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Fluorotrichloromethane; see Trichlorofluoromethane\n\n**CAS No.:** 75694\n\n> 75694 | | Fluorotrichloromethane; see Trichlorofluoromethane\n\nSource: \n", "cas_number": "75694", "file": "fluorotrichloromethane-see-trichlorofluoromethane.md", "generated": true, "harvested": "2026-08-05", "id": "fluorotrichloromethane-see-trichlorofluoromethane", "source_quote": "75694 | | Fluorotrichloromethane; see Trichlorofluoromethane", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Fluorotrichloromethane; see Trichlorofluoromethane", "title": "Fluorotrichloromethane; see Trichlorofluoromethane \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Fluorotrichloromethane (Trichlorofluoromethane)\n\n**CAS No.:** 75-69-4\n\n**PEL (ppm):** 1000\n\n**PEL (mg/m\u00b3):** 5600\n\n> Fluorotrichloromethane (Trichlorofluoromethane) | 75-69-4 | 1000 | 5600 | - |\n\nSource: \n", "cas_number": "75-69-4", "file": "fluorotrichloromethane-trichlorofluoromethane.md", "generated": true, "harvested": "2026-08-05", "id": "fluorotrichloromethane-trichlorofluoromethane", "pel_mgm3": "5600", "pel_ppm": "1000", "source_quote": "Fluorotrichloromethane (Trichlorofluoromethane) | 75-69-4 | 1000 | 5600 | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Fluorotrichloromethane (Trichlorofluoromethane)", "title": "Fluorotrichloromethane (Trichlorofluoromethane) \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Fluorotrichloromethane\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Fluorotrichloromethane\n\n**CAS No.:** 75-69-4\n\n> CAS No. 75-69-4\n\n**NIOSH REL (ppm):** C 1000\n\n**NIOSH REL (mg/m\u00b3):** 5600\n\n> NIOSH REL C 1000 ppm (5600 mg/m3)\n\nSource: \n", "cas_number": "75-69-4", "file": "fluorotrichloromethane.md", "generated": true, "harvested": "2026-09-08", "id": "fluorotrichloromethane", "quote_cas_number": "CAS No. 75-69-4", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Fluorotrichloromethane", "rel_mgm3": "5600", "rel_ppm": "C 1000", "source_quote": "NIOSH REL C 1000 ppm (5600 mg/m3)", "sources": ["https://www.cdc.gov/niosh/npg/npgd0290.html"], "stale_after": "2027-09-08", "substance": "Fluorotrichloromethane", "title": "Fluorotrichloromethane \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Fluoroxene\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Fluoroxene\n\n**CAS No.:** 406-90-6\n\n> CAS No. 406-90-6\n\n**NIOSH REL (ppm):** C 2\n\n**NIOSH REL (mg/m\u00b3):** 10.3\n\n> NIOSH REL C 2 ppm (10.3 mg/m3) [60-minute]\n\nSource: \n", "cas_number": "406-90-6", "file": "fluoroxene.md", "generated": true, "harvested": "2026-09-08", "id": "fluoroxene", "quote_cas_number": "CAS No. 406-90-6", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Fluoroxene", "rel_mgm3": "10.3", "rel_ppm": "C 2", "source_quote": "NIOSH REL C 2 ppm (10.3 mg/m3) [60-minute]", "sources": ["https://www.cdc.gov/niosh/npg/npgd0291.html"], "stale_after": "2027-09-08", "substance": "Fluoroxene", "title": "Fluoroxene \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Fonofos\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Fonofos\n\n**CAS No.:** 944-22-9\n\n> CAS No. 944-22-9\n\n**NIOSH REL (mg/m\u00b3):** TWA 0.1\n\n> NIOSH REL TWA 0.1 mg/m3 [skin]\n\nSource: \n", "cas_number": "944-22-9", "file": "fonofos-2.md", "generated": true, "harvested": "2026-09-08", "id": "fonofos-2", "quote_cas_number": "CAS No. 944-22-9", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Fonofos", "rel_mgm3": "TWA 0.1", "source_quote": "NIOSH REL TWA 0.1 mg/m3 [skin]", "sources": ["https://www.cdc.gov/niosh/npg/npgd0292.html"], "stale_after": "2027-09-08", "substance": "Fonofos", "title": "Fonofos \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Fonofos\n\n**CAS No.:** 944229\n\n**PEL (mg/m\u00b3):** 0.1\n\n> 944229 | S | Fonofos | -- | 0.1\n\nSource: \n", "cas_number": "944229", "file": "fonofos.md", "generated": true, "harvested": "2026-08-05", "id": "fonofos", "pel_mgm3": "0.1", "source_quote": "944229 | S | Fonofos | -- | 0.1", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Fonofos", "title": "Fonofos \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Formaldehyde; see 1910.1048\n\n**CAS No.:** 50-00-0\n\n> Formaldehyde; see 1910.1048 | 50-00-0 | - | - | - |\n\nSource: \n", "cas_number": "50-00-0", "file": "formaldehyde-see-1910-1048.md", "generated": true, "harvested": "2026-08-05", "id": "formaldehyde-see-1910-1048", "source_quote": "Formaldehyde; see 1910.1048 | 50-00-0 | - | - | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Formaldehyde; see 1910.1048", "title": "Formaldehyde; see 1910.1048 \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Formaldehyde, see Section 5217\n\n**CAS No.:** 50000\n\n**PEL (ppm):** 0.75\n\n**STEL (ppm):** 2\n\n> 50000 | | Formaldehyde, see Section 5217 | 0.75 | -- | | 2 | --\n\nSource: \n", "cas_number": "50000", "file": "formaldehyde-see-section-5217.md", "generated": true, "harvested": "2026-08-05", "id": "formaldehyde-see-section-5217", "pel_ppm": "0.75", "source_quote": "50000 | | Formaldehyde, see Section 5217 | 0.75 | -- | | 2 | --", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "stel_ppm": "2", "substance": "Formaldehyde, see Section 5217", "title": "Formaldehyde, see Section 5217 \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Formaldehyde\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Formaldehyde\n\n**CAS No.:** 50-00-0\n\n> CAS No. 50-00-0\n\n**NIOSH REL (ppm):** TWA 0.016\n\n> NIOSH REL Ca TWA 0.016 ppm C 0.1 ppm [15-minute]\n\nSource: \n", "cas_number": "50-00-0", "file": "formaldehyde.md", "generated": true, "harvested": "2026-09-08", "id": "formaldehyde", "quote_cas_number": "CAS No. 50-00-0", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Formaldehyde", "rel_ppm": "TWA 0.016", "source_quote": "NIOSH REL Ca TWA 0.016 ppm C 0.1 ppm [15-minute]", "sources": ["https://www.cdc.gov/niosh/npg/npgd0293.html"], "stale_after": "2027-09-08", "substance": "Formaldehyde", "title": "Formaldehyde \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Formamide\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Formamide\n\n**CAS No.:** 75-12-7\n\n> CAS No. 75-12-7\n\n**NIOSH REL (ppm):** TWA 10\n\n**NIOSH REL (mg/m\u00b3):** 15\n\n> NIOSH REL TWA 10 ppm (15 mg/m3) [skin]\n\nSource: \n", "cas_number": "75-12-7", "file": "formamide-2.md", "generated": true, "harvested": "2026-09-08", "id": "formamide-2", "quote_cas_number": "CAS No. 75-12-7", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Formamide", "rel_mgm3": "15", "rel_ppm": "TWA 10", "source_quote": "NIOSH REL TWA 10 ppm (15 mg/m3) [skin]", "sources": ["https://www.cdc.gov/niosh/npg/npgd0295.html"], "stale_after": "2027-09-08", "substance": "Formamide", "title": "Formamide \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Formamide\n\n**CAS No.:** 75127\n\n**PEL (ppm):** 10\n\n**PEL (mg/m\u00b3):** 18\n\n> 75127 | S | Formamide | 10 | 18\n\nSource: \n", "cas_number": "75127", "file": "formamide.md", "generated": true, "harvested": "2026-08-05", "id": "formamide", "pel_mgm3": "18", "pel_ppm": "10", "source_quote": "75127 | S | Formamide | 10 | 18", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Formamide", "title": "Formamide \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Formic acid\n\n**CAS No.:** 64186\n\n**PEL (ppm):** 5\n\n**PEL (mg/m\u00b3):** 9\n\n**STEL (ppm):** 10\n\n**STEL (mg/m\u00b3):** 19\n\n> 64186 | | Formic acid | 5 | 9 | | 10 | 19\n\nSource: \n", "cas_number": "64186", "file": "formic-acid-2.md", "generated": true, "harvested": "2026-08-05", "id": "formic-acid-2", "pel_mgm3": "9", "pel_ppm": "5", "source_quote": "64186 | | Formic acid | 5 | 9 | | 10 | 19", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "stel_mgm3": "19", "stel_ppm": "10", "substance": "Formic acid", "title": "Formic acid \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Formic acid\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Formic acid\n\n**CAS No.:** 64-18-6\n\n> CAS No. 64-18-6\n\n**NIOSH REL (ppm):** TWA 5\n\n**NIOSH REL (mg/m\u00b3):** 9\n\n> NIOSH REL TWA 5 ppm (9 mg/m3)\n\nSource: \n", "cas_number": "64-18-6", "file": "formic-acid-3.md", "generated": true, "harvested": "2026-09-08", "id": "formic-acid-3", "quote_cas_number": "CAS No. 64-18-6", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Formic acid", "rel_mgm3": "9", "rel_ppm": "TWA 5", "source_quote": "NIOSH REL TWA 5 ppm (9 mg/m3)", "sources": ["https://www.cdc.gov/niosh/npg/npgd0296.html"], "stale_after": "2027-09-08", "substance": "Formic acid", "title": "Formic acid \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Formic acid\n\n**CAS No.:** 64-18-6\n\n**PEL (ppm):** 5\n\n**PEL (mg/m\u00b3):** 9\n\n> Formic acid | 64-18-6 | 5 | 9 | - |\n\nSource: \n", "cas_number": "64-18-6", "file": "formic-acid.md", "generated": true, "harvested": "2026-08-05", "id": "formic-acid", "pel_mgm3": "9", "pel_ppm": "5", "source_quote": "Formic acid | 64-18-6 | 5 | 9 | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Formic acid", "title": "Formic acid \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Furfural\n\n**CAS No.:** 98011\n\n**PEL (ppm):** 2\n\n**PEL (mg/m\u00b3):** 8\n\n> 98011 | S | Furfural | 2 | 8\n\nSource: \n", "cas_number": "98011", "file": "furfural-2.md", "generated": true, "harvested": "2026-08-05", "id": "furfural-2", "pel_mgm3": "8", "pel_ppm": "2", "source_quote": "98011 | S | Furfural | 2 | 8", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Furfural", "title": "Furfural \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Furfural\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Furfural\n\n**CAS No.:** 98-01-1\n\n> CAS No. 98-01-1\n\n**NIOSH REL, as stated:** See Appendix D\n\n> NIOSH REL See Appendix D\n\nSource: \n", "cas_number": "98-01-1", "file": "furfural-3.md", "generated": true, "harvested": "2026-09-08", "id": "furfural-3", "quote_cas_number": "CAS No. 98-01-1", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Furfural", "rel_statement": "See Appendix D", "source_quote": "NIOSH REL See Appendix D", "sources": ["https://www.cdc.gov/niosh/npg/npgd0297.html"], "stale_after": "2027-09-08", "substance": "Furfural", "title": "Furfural \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Furfural\n\n**CAS No.:** 98-01-1\n\n**PEL (ppm):** 5\n\n**PEL (mg/m\u00b3):** 20\n\n> Furfural | 98-01-1 | 5 | 20 | X |\n\nSource: \n", "cas_number": "98-01-1", "file": "furfural.md", "generated": true, "harvested": "2026-08-05", "id": "furfural", "pel_mgm3": "20", "pel_ppm": "5", "source_quote": "Furfural | 98-01-1 | 5 | 20 | X |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Furfural", "title": "Furfural \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Furfuryl alcohol\n\n**CAS No.:** 98000\n\n**PEL (ppm):** 10\n\n**PEL (mg/m\u00b3):** 40\n\n**STEL (ppm):** 15\n\n**STEL (mg/m\u00b3):** 60\n\n> 98000 | S | Furfuryl alcohol | 10 | 40 | | 15 | 60\n\nSource: \n", "cas_number": "98000", "file": "furfuryl-alcohol-2.md", "generated": true, "harvested": "2026-08-05", "id": "furfuryl-alcohol-2", "pel_mgm3": "40", "pel_ppm": "10", "source_quote": "98000 | S | Furfuryl alcohol | 10 | 40 | | 15 | 60", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "stel_mgm3": "60", "stel_ppm": "15", "substance": "Furfuryl alcohol", "title": "Furfuryl alcohol \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Furfuryl alcohol\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Furfuryl alcohol\n\n**CAS No.:** 98-00-0\n\n> CAS No. 98-00-0\n\n**NIOSH REL (ppm):** TWA 10\n\n**NIOSH REL (mg/m\u00b3):** 40\n\n> NIOSH REL TWA 10 ppm (40 mg/m3) ST 15 ppm (60 mg/m3) [skin]\n\nSource: \n", "cas_number": "98-00-0", "file": "furfuryl-alcohol-3.md", "generated": true, "harvested": "2026-09-08", "id": "furfuryl-alcohol-3", "quote_cas_number": "CAS No. 98-00-0", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Furfuryl alcohol", "rel_mgm3": "40", "rel_ppm": "TWA 10", "source_quote": "NIOSH REL TWA 10 ppm (40 mg/m3) ST 15 ppm (60 mg/m3) [skin]", "sources": ["https://www.cdc.gov/niosh/npg/npgd0298.html"], "stale_after": "2027-09-08", "substance": "Furfuryl alcohol", "title": "Furfuryl alcohol \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Furfuryl alcohol\n\n**CAS No.:** 98-00-0\n\n**PEL (ppm):** 50\n\n**PEL (mg/m\u00b3):** 200\n\n> Furfuryl alcohol | 98-00-0 | 50 | 200 | - |\n\nSource: \n", "cas_number": "98-00-0", "file": "furfuryl-alcohol.md", "generated": true, "harvested": "2026-08-05", "id": "furfuryl-alcohol", "pel_mgm3": "200", "pel_ppm": "50", "source_quote": "Furfuryl alcohol | 98-00-0 | 50 | 200 | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Furfuryl alcohol", "title": "Furfuryl alcohol \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Gasoline\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Gasoline\n\n**CAS No.:** 8006-61-9\n\n> CAS No. 8006-61-9\n\n**NIOSH REL, as stated:** Ca See Appendix A\n\n> NIOSH REL Ca See Appendix A\n\nSource: \n", "cas_number": "8006-61-9", "file": "gasoline-2.md", "generated": true, "harvested": "2026-09-08", "id": "gasoline-2", "quote_cas_number": "CAS No. 8006-61-9", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Gasoline", "rel_statement": "Ca See Appendix A", "source_quote": "NIOSH REL Ca See Appendix A", "sources": ["https://www.cdc.gov/niosh/npg/npgd0299.html"], "stale_after": "2027-09-08", "substance": "Gasoline", "title": "Gasoline \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Gasoline\n\n**CAS No.:** 8006619\n\n**PEL (ppm):** 300\n\n**PEL (mg/m\u00b3):** 900\n\n**STEL (ppm):** 500\n\n**STEL (mg/m\u00b3):** 1500\n\n> 8006619 | | Gasoline | 300 | 900 | | 500 | 1500\n\nSource: \n", "cas_number": "8006619", "file": "gasoline.md", "generated": true, "harvested": "2026-08-05", "id": "gasoline", "pel_mgm3": "900", "pel_ppm": "300", "source_quote": "8006619 | | Gasoline | 300 | 900 | | 500 | 1500", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "stel_mgm3": "1500", "stel_ppm": "500", "substance": "Gasoline", "title": "Gasoline \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Germanium tetrahydride\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Germanium tetrahydride\n\n**CAS No.:** 7782-65-2\n\n> CAS No. 7782-65-2\n\n**NIOSH REL (ppm):** TWA 0.2\n\n**NIOSH REL (mg/m\u00b3):** 0.6\n\n> NIOSH REL TWA 0.2 ppm (0.6 mg/m3)\n\nSource: \n", "cas_number": "7782-65-2", "file": "germanium-tetrahydride-2.md", "generated": true, "harvested": "2026-09-08", "id": "germanium-tetrahydride-2", "quote_cas_number": "CAS No. 7782-65-2", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Germanium tetrahydride", "rel_mgm3": "0.6", "rel_ppm": "TWA 0.2", "source_quote": "NIOSH REL TWA 0.2 ppm (0.6 mg/m3)", "sources": ["https://www.cdc.gov/niosh/npg/npgd0300.html"], "stale_after": "2027-09-08", "substance": "Germanium tetrahydride", "title": "Germanium tetrahydride \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Germanium tetrahydride\n\n**CAS No.:** 7782652\n\n**PEL (ppm):** 0.2\n\n**PEL (mg/m\u00b3):** 0.6\n\n> 7782652 | | Germanium tetrahydride | 0.2 | 0.6\n\nSource: \n", "cas_number": "7782652", "file": "germanium-tetrahydride.md", "generated": true, "harvested": "2026-08-05", "id": "germanium-tetrahydride", "pel_mgm3": "0.6", "pel_ppm": "0.2", "source_quote": "7782652 | | Germanium tetrahydride | 0.2 | 0.6", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Germanium tetrahydride", "title": "Germanium tetrahydride \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Glutaraldehyde(t)\n\n**CAS No.:** 111308\n\n**PEL (ppm):** 0.05\n\n**PEL (mg/m\u00b3):** 0.2\n\n**Ceiling:** C\n\n> 111308 | | Glutaraldehyde(t) | 0.05 | 0.2 | C\n\nSource: \n", "cas_number": "111308", "ceiling": "C", "file": "glutaraldehyde-t.md", "generated": true, "harvested": "2026-08-05", "id": "glutaraldehyde-t", "pel_mgm3": "0.2", "pel_ppm": "0.05", "source_quote": "111308 | | Glutaraldehyde(t) | 0.05 | 0.2 | C", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Glutaraldehyde(t)", "title": "Glutaraldehyde (t) \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Glutaraldehyde\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Glutaraldehyde\n\n**CAS No.:** 111-30-8\n\n> CAS No. 111-30-8\n\n**NIOSH REL (ppm):** C 0.2\n\n**NIOSH REL (mg/m\u00b3):** 0.8\n\n> NIOSH REL C 0.2 ppm (0.8 mg/m3)\n\nSource: \n", "cas_number": "111-30-8", "file": "glutaraldehyde.md", "generated": true, "harvested": "2026-09-08", "id": "glutaraldehyde", "quote_cas_number": "CAS No. 111-30-8", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Glutaraldehyde", "rel_mgm3": "0.8", "rel_ppm": "C 0.2", "source_quote": "NIOSH REL C 0.2 ppm (0.8 mg/m3)", "sources": ["https://www.cdc.gov/niosh/npg/npgd0301.html"], "stale_after": "2027-09-08", "substance": "Glutaraldehyde", "title": "Glutaraldehyde \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Glycerin (mist)\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Glycerin (mist)\n\n**CAS No.:** 56-81-5\n\n> CAS No. 56-81-5\n\n**NIOSH REL, as stated:** See Appendix D\n\n> NIOSH REL See Appendix D\n\nSource: \n", "cas_number": "56-81-5", "file": "glycerin-mist-2.md", "generated": true, "harvested": "2026-09-08", "id": "glycerin-mist-2", "quote_cas_number": "CAS No. 56-81-5", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Glycerin (mist)", "rel_statement": "See Appendix D", "source_quote": "NIOSH REL See Appendix D", "sources": ["https://www.cdc.gov/niosh/npg/npgd0302.html"], "stale_after": "2027-09-08", "substance": "Glycerin (mist)", "title": "Glycerin (mist) \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Glycerin mist; see Particulates not otherwise regulated\n\n**CAS No.:** 56815\n\n> 56815 | | Glycerin mist; see Particulates not otherwise regulated\n\nSource: \n", "cas_number": "56815", "file": "glycerin-mist-see-particulates-not-otherwise-regulated.md", "generated": true, "harvested": "2026-08-05", "id": "glycerin-mist-see-particulates-not-otherwise-regulated", "source_quote": "56815 | | Glycerin mist; see Particulates not otherwise regulated", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Glycerin mist; see Particulates not otherwise regulated", "title": "Glycerin mist; see Particulates not otherwise regulated \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Glycerin (mist)\n\n**CAS No.:** 56-81-5\n\n> Glycerin (mist) | 56-81-5 | - | - | - |\n\nSource: \n", "cas_number": "56-81-5", "file": "glycerin-mist.md", "generated": true, "harvested": "2026-08-05", "id": "glycerin-mist", "source_quote": "Glycerin (mist) | 56-81-5 | - | - | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Glycerin (mist)", "title": "Glycerin (mist) \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Glyceryl stearate\n\n**CAS No.:** 123944\n\n**PEL (mg/m\u00b3):** 10\n\n> 123944 | | Glyceryl stearate | -- | 10\n\nSource: \n", "cas_number": "123944", "file": "glyceryl-stearate.md", "generated": true, "harvested": "2026-08-05", "id": "glyceryl-stearate", "pel_mgm3": "10", "source_quote": "123944 | | Glyceryl stearate | -- | 10", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Glyceryl stearate", "title": "Glyceryl stearate \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Glycidol; 2,3-epoxy-1-propanol\n\n**CAS No.:** 556525\n\n**PEL (ppm):** 2\n\n**PEL (mg/m\u00b3):** 6.1\n\n> 556525 | | Glycidol; 2,3-epoxy-1-propanol | 2 | 6.1\n\nSource: \n", "cas_number": "556525", "file": "glycidol-2-3-epoxy-1-propanol.md", "generated": true, "harvested": "2026-08-05", "id": "glycidol-2-3-epoxy-1-propanol", "pel_mgm3": "6.1", "pel_ppm": "2", "source_quote": "556525 | | Glycidol; 2,3-epoxy-1-propanol | 2 | 6.1", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Glycidol; 2,3-epoxy-1-propanol", "title": "Glycidol; 2,3-epoxy-1-propanol \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Glycidol\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Glycidol\n\n**CAS No.:** 556-52-5\n\n> CAS No. 556-52-5\n\n**NIOSH REL (ppm):** TWA 25\n\n**NIOSH REL (mg/m\u00b3):** 75\n\n> NIOSH REL TWA 25 ppm (75 mg/m3)\n\nSource: \n", "cas_number": "556-52-5", "file": "glycidol-2.md", "generated": true, "harvested": "2026-09-08", "id": "glycidol-2", "quote_cas_number": "CAS No. 556-52-5", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Glycidol", "rel_mgm3": "75", "rel_ppm": "TWA 25", "source_quote": "NIOSH REL TWA 25 ppm (75 mg/m3)", "sources": ["https://www.cdc.gov/niosh/npg/npgd0303.html"], "stale_after": "2027-09-08", "substance": "Glycidol", "title": "Glycidol \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Glycidol\n\n**CAS No.:** 556-52-5\n\n**PEL (ppm):** 50\n\n**PEL (mg/m\u00b3):** 150\n\n> Glycidol | 556-52-5 | 50 | 150 | - |\n\nSource: \n", "cas_number": "556-52-5", "file": "glycidol.md", "generated": true, "harvested": "2026-08-05", "id": "glycidol", "pel_mgm3": "150", "pel_ppm": "50", "source_quote": "Glycidol | 556-52-5 | 50 | 150 | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Glycidol", "title": "Glycidol \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Glycol monobutyl ether; see 2-Butoxyethanol\n\n**CAS No.:** 111762\n\n> 111762 | | Glycol monobutyl ether; see 2-Butoxyethanol\n\nSource: \n", "cas_number": "111762", "file": "glycol-monobutyl-ether-see-2-butoxyethanol.md", "generated": true, "harvested": "2026-08-05", "id": "glycol-monobutyl-ether-see-2-butoxyethanol", "source_quote": "111762 | | Glycol monobutyl ether; see 2-Butoxyethanol", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Glycol monobutyl ether; see 2-Butoxyethanol", "title": "Glycol monobutyl ether; see 2-Butoxyethanol \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Glycol monoethyl ether; see 2-Ethoxyethanol\n\n**CAS No.:** 110805\n\n> 110805 | | Glycol monoethyl ether; see 2-Ethoxyethanol\n\nSource: \n", "cas_number": "110805", "file": "glycol-monoethyl-ether-see-2-ethoxyethanol.md", "generated": true, "harvested": "2026-08-05", "id": "glycol-monoethyl-ether-see-2-ethoxyethanol", "source_quote": "110805 | | Glycol monoethyl ether; see 2-Ethoxyethanol", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Glycol monoethyl ether; see 2-Ethoxyethanol", "title": "Glycol monoethyl ether; see 2-Ethoxyethanol \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Glycol monomethyl ether; see 2-Methoxyethanol\n\n**CAS No.:** 109864\n\n> 109864 | | Glycol monomethyl ether; see 2-Methoxyethanol\n\nSource: \n", "cas_number": "109864", "file": "glycol-monomethyl-ether-see-2-methoxyethanol.md", "generated": true, "harvested": "2026-08-05", "id": "glycol-monomethyl-ether-see-2-methoxyethanol", "source_quote": "109864 | | Glycol monomethyl ether; see 2-Methoxyethanol", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Glycol monomethyl ether; see 2-Methoxyethanol", "title": "Glycol monomethyl ether; see 2-Methoxyethanol \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Glycolonitrile\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Glycolonitrile\n\n**CAS No.:** 107-16-4\n\n> CAS No. 107-16-4\n\n**NIOSH REL (ppm):** C 2\n\n**NIOSH REL (mg/m\u00b3):** 5\n\n> NIOSH REL C 2 ppm (5 mg/m3) [15-minute]\n\nSource: \n", "cas_number": "107-16-4", "file": "glycolonitrile.md", "generated": true, "harvested": "2026-09-08", "id": "glycolonitrile", "quote_cas_number": "CAS No. 107-16-4", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Glycolonitrile", "rel_mgm3": "5", "rel_ppm": "C 2", "source_quote": "NIOSH REL C 2 ppm (5 mg/m3) [15-minute]", "sources": ["https://www.cdc.gov/niosh/npg/npgd0304.html"], "stale_after": "2027-09-08", "substance": "Glycolonitrile", "title": "Glycolonitrile \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Glyoxal, 1,2-ethanedione\n\n**CAS No.:** 107222\n\n**PEL (mg/m\u00b3):** 0.1(s), (u)\n\n> 107222 | | Glyoxal, 1,2-ethanedione | -- | 0.1(s), (u)\n\nSource: \n", "cas_number": "107222", "file": "glyoxal-1-2-ethanedione.md", "generated": true, "harvested": "2026-08-05", "id": "glyoxal-1-2-ethanedione", "pel_mgm3": "0.1(s), (u)", "source_quote": "107222 | | Glyoxal, 1,2-ethanedione | -- | 0.1(s), (u)", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Glyoxal, 1,2-ethanedione", "title": "Glyoxal, 1,2-ethanedione \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Graphite, natural respirable dust\n\n**CAS No.:** 7782425\n\n**PEL (mg/m\u00b3):** 2.5\n\n> 7782425 | | Graphite, natural respirable dust | | 2.5\n\nSource: \n", "cas_number": "7782425", "file": "graphite-natural-respirable-dust-2.md", "generated": true, "harvested": "2026-08-05", "id": "graphite-natural-respirable-dust-2", "pel_mgm3": "2.5", "source_quote": "7782425 | | Graphite, natural respirable dust | | 2.5", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Graphite, natural respirable dust", "title": "Graphite, natural respirable dust \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Graphite, natural, respirable dust\n\n**CAS No.:** 7782-42-5\n\n> Graphite, natural, respirable dust | 7782-42-5 | - | (3) | - |\n\nSource: \n", "cas_number": "7782-42-5", "file": "graphite-natural-respirable-dust.md", "generated": true, "harvested": "2026-08-05", "id": "graphite-natural-respirable-dust", "source_quote": "Graphite, natural, respirable dust | 7782-42-5 | - | (3) | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Graphite, natural, respirable dust", "title": "Graphite, natural, respirable dust \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Graphite (natural)\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Graphite (natural)\n\n**CAS No.:** 7782-42-5\n\n> CAS No. 7782-42-5\n\n**NIOSH REL, as stated:** TWA 2.5 mg/m3 (resp)\n\n> NIOSH REL TWA 2.5 mg/m3 (resp)\n\nSource: \n", "cas_number": "7782-42-5", "file": "graphite-natural.md", "generated": true, "harvested": "2026-09-08", "id": "graphite-natural", "quote_cas_number": "CAS No. 7782-42-5", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Graphite (natural)", "rel_statement": "TWA 2.5 mg/m3 (resp)", "source_quote": "NIOSH REL TWA 2.5 mg/m3 (resp)", "sources": ["https://www.cdc.gov/niosh/npg/npgd0306.html"], "stale_after": "2027-09-08", "substance": "Graphite (natural)", "title": "Graphite (natural) \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Graphite (synthetic)\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Graphite (synthetic)\n\n**CAS No.:** 7440-44-0 (synthetic)\n\n> CAS No. 7440-44-0 (synthetic)\n\n**NIOSH REL, as stated:** See Appendix D\n\n> NIOSH REL See Appendix D\n\nSource: \n", "cas_number": "7440-44-0 (synthetic)", "file": "graphite-synthetic.md", "generated": true, "harvested": "2026-09-08", "id": "graphite-synthetic", "quote_cas_number": "CAS No. 7440-44-0 (synthetic)", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Graphite (synthetic)", "rel_statement": "See Appendix D", "source_quote": "NIOSH REL See Appendix D", "sources": ["https://www.cdc.gov/niosh/npg/npgd0307.html"], "stale_after": "2027-09-08", "substance": "Graphite (synthetic)", "title": "Graphite (synthetic) \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Gypsum\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Gypsum\n\n**CAS No.:** 13397-24-5\n\n> CAS No. 13397-24-5\n\n**NIOSH REL, as stated:** TWA 10 mg/m3 (total) TWA 5 mg/m3 (resp)\n\n> NIOSH REL TWA 10 mg/m3 (total) TWA 5 mg/m3 (resp)\n\nSource: \n", "cas_number": "13397-24-5", "file": "gypsum-2.md", "generated": true, "harvested": "2026-09-08", "id": "gypsum-2", "quote_cas_number": "CAS No. 13397-24-5", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Gypsum", "rel_statement": "TWA 10 mg/m3 (total) TWA 5 mg/m3 (resp)", "source_quote": "NIOSH REL TWA 10 mg/m3 (total) TWA 5 mg/m3 (resp)", "sources": ["https://www.cdc.gov/niosh/npg/npgd0308.html"], "stale_after": "2027-09-08", "substance": "Gypsum", "title": "Gypsum \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Gypsum; Calcium sulfate dihydrate; see Particulates not otherwise regulated\n\n**CAS No.:** 13397245\n\n> 13397245 | | Gypsum; Calcium sulfate dihydrate; see Particulates not otherwise regulated\n\nSource: \n", "cas_number": "13397245", "file": "gypsum-calcium-sulfate-dihydrate-see-particulates-not-otherwise-regulated.md", "generated": true, "harvested": "2026-08-05", "id": "gypsum-calcium-sulfate-dihydrate-see-particulates-not-otherwise-regulated", "source_quote": "13397245 | | Gypsum; Calcium sulfate dihydrate; see Particulates not otherwise regulated", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Gypsum; Calcium sulfate dihydrate; see Particulates not otherwise regulated", "title": "Gypsum; Calcium sulfate dihydrate; see Particulates not otherwise regulated \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Gypsum\n\n**CAS No.:** 13397-24-5\n\n> Gypsum | 13397-24-5 | - | - | - |\n\nSource: \n", "cas_number": "13397-24-5", "file": "gypsum.md", "generated": true, "harvested": "2026-08-05", "id": "gypsum", "source_quote": "Gypsum | 13397-24-5 | - | - | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Gypsum", "title": "Gypsum \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Hafnium\n\n**CAS No.:** 7440586\n\n**PEL (mg/m\u00b3):** 0.5\n\n> 7440586 | | Hafnium | -- | 0.5\n\nSource: \n", "cas_number": "7440586", "file": "hafnium-2.md", "generated": true, "harvested": "2026-08-05", "id": "hafnium-2", "pel_mgm3": "0.5", "source_quote": "7440586 | | Hafnium | -- | 0.5", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Hafnium", "title": "Hafnium \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Hafnium\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Hafnium\n\n**CAS No.:** 7440-58-6\n\n> CAS No. 7440-58-6\n\n**NIOSH REL (mg/m\u00b3):** TWA 0.5\n\n> NIOSH REL TWA 0.5 mg/m3\n\nSource: \n", "cas_number": "7440-58-6", "file": "hafnium-3.md", "generated": true, "harvested": "2026-09-08", "id": "hafnium-3", "quote_cas_number": "CAS No. 7440-58-6", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Hafnium", "rel_mgm3": "TWA 0.5", "source_quote": "NIOSH REL TWA 0.5 mg/m3", "sources": ["https://www.cdc.gov/niosh/npg/npgd0309.html"], "stale_after": "2027-09-08", "substance": "Hafnium", "title": "Hafnium \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Hafnium\n\n**CAS No.:** 7440-58-6\n\n**PEL (mg/m\u00b3):** 0.5\n\n> Hafnium | 7440-58-6 | - | 0.5 | - |\n\nSource: \n", "cas_number": "7440-58-6", "file": "hafnium.md", "generated": true, "harvested": "2026-08-05", "id": "hafnium", "pel_mgm3": "0.5", "source_quote": "Hafnium | 7440-58-6 | - | 0.5 | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Hafnium", "title": "Hafnium \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Halothane\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Halothane\n\n**CAS No.:** 151-67-7\n\n> CAS No. 151-67-7\n\n**NIOSH REL (ppm):** C 2\n\n**NIOSH REL (mg/m\u00b3):** 16.2\n\n> NIOSH REL C 2 ppm (16.2 mg/m3) [60-minute]\n\nSource: \n", "cas_number": "151-67-7", "file": "halothane-2.md", "generated": true, "harvested": "2026-09-08", "id": "halothane-2", "quote_cas_number": "CAS No. 151-67-7", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Halothane", "rel_mgm3": "16.2", "rel_ppm": "C 2", "source_quote": "NIOSH REL C 2 ppm (16.2 mg/m3) [60-minute]", "sources": ["https://www.cdc.gov/niosh/npg/npgd0310.html"], "stale_after": "2027-09-08", "substance": "Halothane", "title": "Halothane \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Halothane\n\n**CAS No.:** 151677\n\n**PEL (ppm):** 2\n\n**PEL (mg/m\u00b3):** 16\n\n> 151677 | | Halothane | 2 | 16\n\nSource: \n", "cas_number": "151677", "file": "halothane.md", "generated": true, "harvested": "2026-08-05", "id": "halothane", "pel_mgm3": "16", "pel_ppm": "2", "source_quote": "151677 | | Halothane | 2 | 16", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Halothane", "title": "Halothane \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** HDI; see Hexamethylene diisocyanate\n\n**CAS No.:** 822060\n\n> 822060 | | HDI; see Hexamethylene diisocyanate\n\nSource: \n", "cas_number": "822060", "file": "hdi-see-hexamethylene-diisocyanate.md", "generated": true, "harvested": "2026-08-05", "id": "hdi-see-hexamethylene-diisocyanate", "source_quote": "822060 | | HDI; see Hexamethylene diisocyanate", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "HDI; see Hexamethylene diisocyanate", "title": "HDI; see Hexamethylene diisocyanate \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Helium\n\n**CAS No.:** 7440597\n\n> 7440597 | | Helium | (h) | --\n\nSource: \n", "cas_number": "7440597", "file": "helium.md", "generated": true, "harvested": "2026-08-05", "id": "helium", "source_quote": "7440597 | | Helium | (h) | --", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Helium", "title": "Helium \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Heptachlor; 1,4,5,6,7,8,8-hepta-chloro-3a,4,7,7a-tetrahydro-4,7-methanoindene\n\n**CAS No.:** 76448\n\n**PEL (mg/m\u00b3):** 0.05\n\n> 76448 | S | Heptachlor; 1,4,5,6,7,8,8-hepta-chloro-3a,4,7,7a-tetrahydro-4,7-methanoindene | -- | 0.05\n\nSource: \n", "cas_number": "76448", "file": "heptachlor-1-4-5-6-7-8-8-hepta-chloro-3a-4-7-7a-tetrahydro-4-7-methanoindene.md", "generated": true, "harvested": "2026-08-05", "id": "heptachlor-1-4-5-6-7-8-8-hepta-chloro-3a-4-7-7a-tetrahydro-4-7-methanoindene", "pel_mgm3": "0.05", "source_quote": "76448 | S | Heptachlor; 1,4,5,6,7,8,8-hepta-chloro-3a,4,7,7a-tetrahydro-4,7-methanoindene | -- | 0.05", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Heptachlor; 1,4,5,6,7,8,8-hepta-chloro-3a,4,7,7a-tetrahydro-4,7-methanoindene", "title": "Heptachlor; 1,4,5,6,7,8,8-hepta-chloro-3a,4,7,7a-tetrahydro-4,7-methanoindene \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Heptachlor\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Heptachlor\n\n**CAS No.:** 76-44-8\n\n> CAS No. 76-44-8\n\n**NIOSH REL (mg/m\u00b3):** TWA 0.5\n\n> NIOSH REL Ca TWA 0.5 mg/m3 [skin]\n\nSource: \n", "cas_number": "76-44-8", "file": "heptachlor-2.md", "generated": true, "harvested": "2026-09-08", "id": "heptachlor-2", "quote_cas_number": "CAS No. 76-44-8", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Heptachlor", "rel_mgm3": "TWA 0.5", "source_quote": "NIOSH REL Ca TWA 0.5 mg/m3 [skin]", "sources": ["https://www.cdc.gov/niosh/npg/npgd0311.html"], "stale_after": "2027-09-08", "substance": "Heptachlor", "title": "Heptachlor \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Heptachlor\n\n**CAS No.:** 76-44-8\n\n**PEL (mg/m\u00b3):** 0.5\n\n> Heptachlor | 76-44-8 | - | 0.5 | X |\n\nSource: \n", "cas_number": "76-44-8", "file": "heptachlor.md", "generated": true, "harvested": "2026-08-05", "id": "heptachlor", "pel_mgm3": "0.5", "source_quote": "Heptachlor | 76-44-8 | - | 0.5 | X |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Heptachlor", "title": "Heptachlor \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Heptane (n-Heptane)\n\n**CAS No.:** 142-82-5\n\n**PEL (ppm):** 500\n\n**PEL (mg/m\u00b3):** 2000\n\n> Heptane (n-Heptane) | 142-82-5 | 500 | 2000 | - |\n\nSource: \n", "cas_number": "142-82-5", "file": "heptane-n-heptane.md", "generated": true, "harvested": "2026-08-05", "id": "heptane-n-heptane", "pel_mgm3": "2000", "pel_ppm": "500", "source_quote": "Heptane (n-Heptane) | 142-82-5 | 500 | 2000 | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Heptane (n-Heptane)", "title": "Heptane (n-Heptane) \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Hexachlorobenzene\n\n**CAS No.:** 118741\n\n**PEL (mg/m\u00b3):** 0.002\n\n> 118741 | S | Hexachlorobenzene | -- | 0.002\n\nSource: \n", "cas_number": "118741", "file": "hexachlorobenzene.md", "generated": true, "harvested": "2026-08-05", "id": "hexachlorobenzene", "pel_mgm3": "0.002", "source_quote": "118741 | S | Hexachlorobenzene | -- | 0.002", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Hexachlorobenzene", "title": "Hexachlorobenzene \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Hexachlorobutadiene\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Hexachlorobutadiene\n\n**CAS No.:** 87-68-3\n\n> CAS No. 87-68-3\n\n**NIOSH REL (ppm):** TWA 0.02\n\n**NIOSH REL (mg/m\u00b3):** 0.24\n\n> NIOSH REL Ca TWA 0.02 ppm (0.24 mg/m3) [skin]\n\nSource: \n", "cas_number": "87-68-3", "file": "hexachlorobutadiene-2.md", "generated": true, "harvested": "2026-09-08", "id": "hexachlorobutadiene-2", "quote_cas_number": "CAS No. 87-68-3", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Hexachlorobutadiene", "rel_mgm3": "0.24", "rel_ppm": "TWA 0.02", "source_quote": "NIOSH REL Ca TWA 0.02 ppm (0.24 mg/m3) [skin]", "sources": ["https://www.cdc.gov/niosh/npg/npgd0314.html"], "stale_after": "2027-09-08", "substance": "Hexachlorobutadiene", "title": "Hexachlorobutadiene \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Hexachlorobutadiene\n\n**CAS No.:** 87683\n\n**PEL (ppm):** 0.02\n\n**PEL (mg/m\u00b3):** 0.24\n\n> 87683 | S | Hexachlorobutadiene | 0.02 | 0.24\n\nSource: \n", "cas_number": "87683", "file": "hexachlorobutadiene.md", "generated": true, "harvested": "2026-08-05", "id": "hexachlorobutadiene", "pel_mgm3": "0.24", "pel_ppm": "0.02", "source_quote": "87683 | S | Hexachlorobutadiene | 0.02 | 0.24", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Hexachlorobutadiene", "title": "Hexachlorobutadiene \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Hexachlorocyclopentadiene\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Hexachlorocyclopentadiene\n\n**CAS No.:** 77-47-4\n\n> CAS No. 77-47-4\n\n**NIOSH REL (ppm):** TWA 0.01\n\n**NIOSH REL (mg/m\u00b3):** 0.1\n\n> NIOSH REL TWA 0.01 ppm (0.1 mg/m3)\n\nSource: \n", "cas_number": "77-47-4", "file": "hexachlorocyclopentadiene-2.md", "generated": true, "harvested": "2026-09-08", "id": "hexachlorocyclopentadiene-2", "quote_cas_number": "CAS No. 77-47-4", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Hexachlorocyclopentadiene", "rel_mgm3": "0.1", "rel_ppm": "TWA 0.01", "source_quote": "NIOSH REL TWA 0.01 ppm (0.1 mg/m3)", "sources": ["https://www.cdc.gov/niosh/npg/npgd0315.html"], "stale_after": "2027-09-08", "substance": "Hexachlorocyclopentadiene", "title": "Hexachlorocyclopentadiene \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Hexachlorocyclopentadiene\n\n**CAS No.:** 77474\n\n**PEL (ppm):** 0.01\n\n**PEL (mg/m\u00b3):** 0.11\n\n> 77474 | | Hexachlorocyclopentadiene | 0.01 | 0.11\n\nSource: \n", "cas_number": "77474", "file": "hexachlorocyclopentadiene.md", "generated": true, "harvested": "2026-08-05", "id": "hexachlorocyclopentadiene", "pel_mgm3": "0.11", "pel_ppm": "0.01", "source_quote": "77474 | | Hexachlorocyclopentadiene | 0.01 | 0.11", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Hexachlorocyclopentadiene", "title": "Hexachlorocyclopentadiene \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Hexachloroethane\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Hexachloroethane\n\n**CAS No.:** 67-72-1\n\n> CAS No. 67-72-1\n\n**NIOSH REL (ppm):** TWA 1\n\n**NIOSH REL (mg/m\u00b3):** 10\n\n> NIOSH REL Ca TWA 1 ppm (10 mg/m3) [skin]\n\nSource: \n", "cas_number": "67-72-1", "file": "hexachloroethane-2.md", "generated": true, "harvested": "2026-09-08", "id": "hexachloroethane-2", "quote_cas_number": "CAS No. 67-72-1", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Hexachloroethane", "rel_mgm3": "10", "rel_ppm": "TWA 1", "source_quote": "NIOSH REL Ca TWA 1 ppm (10 mg/m3) [skin]", "sources": ["https://www.cdc.gov/niosh/npg/npgd0316.html"], "stale_after": "2027-09-08", "substance": "Hexachloroethane", "title": "Hexachloroethane \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Hexachloroethane; perchloroethane\n\n**CAS No.:** 67721\n\n**PEL (ppm):** 1\n\n**PEL (mg/m\u00b3):** 10\n\n> 67721 | S | Hexachloroethane; perchloroethane | 1 | 10\n\nSource: \n", "cas_number": "67721", "file": "hexachloroethane-perchloroethane.md", "generated": true, "harvested": "2026-08-05", "id": "hexachloroethane-perchloroethane", "pel_mgm3": "10", "pel_ppm": "1", "source_quote": "67721 | S | Hexachloroethane; perchloroethane | 1 | 10", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Hexachloroethane; perchloroethane", "title": "Hexachloroethane; perchloroethane \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Hexachloroethane\n\n**CAS No.:** 67-72-1\n\n**PEL (ppm):** 1\n\n**PEL (mg/m\u00b3):** 10\n\n> Hexachloroethane | 67-72-1 | 1 | 10 | X |\n\nSource: \n", "cas_number": "67-72-1", "file": "hexachloroethane.md", "generated": true, "harvested": "2026-08-05", "id": "hexachloroethane", "pel_mgm3": "10", "pel_ppm": "1", "source_quote": "Hexachloroethane | 67-72-1 | 1 | 10 | X |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Hexachloroethane", "title": "Hexachloroethane \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Hexachloronaphthalene\n\n**CAS No.:** 1335871\n\n**PEL (mg/m\u00b3):** 0.2\n\n> 1335871 | S | Hexachloronaphthalene | -- | 0.2\n\nSource: \n", "cas_number": "1335871", "file": "hexachloronaphthalene-2.md", "generated": true, "harvested": "2026-08-05", "id": "hexachloronaphthalene-2", "pel_mgm3": "0.2", "source_quote": "1335871 | S | Hexachloronaphthalene | -- | 0.2", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Hexachloronaphthalene", "title": "Hexachloronaphthalene \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Hexachloronaphthalene\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Hexachloronaphthalene\n\n**CAS No.:** 1335-87-1\n\n> CAS No. 1335-87-1\n\n**NIOSH REL (mg/m\u00b3):** TWA 0.2\n\n> NIOSH REL TWA 0.2 mg/m3 [skin]\n\nSource: \n", "cas_number": "1335-87-1", "file": "hexachloronaphthalene-3.md", "generated": true, "harvested": "2026-09-08", "id": "hexachloronaphthalene-3", "quote_cas_number": "CAS No. 1335-87-1", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Hexachloronaphthalene", "rel_mgm3": "TWA 0.2", "source_quote": "NIOSH REL TWA 0.2 mg/m3 [skin]", "sources": ["https://www.cdc.gov/niosh/npg/npgd0317.html"], "stale_after": "2027-09-08", "substance": "Hexachloronaphthalene", "title": "Hexachloronaphthalene \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Hexachloronaphthalene\n\n**CAS No.:** 1335-87-1\n\n**PEL (mg/m\u00b3):** 0.2\n\n> Hexachloronaphthalene | 1335-87-1 | - | 0.2 | X |\n\nSource: \n", "cas_number": "1335-87-1", "file": "hexachloronaphthalene.md", "generated": true, "harvested": "2026-08-05", "id": "hexachloronaphthalene", "pel_mgm3": "0.2", "source_quote": "Hexachloronaphthalene | 1335-87-1 | - | 0.2 | X |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Hexachloronaphthalene", "title": "Hexachloronaphthalene \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Hexafluoroacetone; 1,1,1,3,3,3-hexafluoro-2-propanone\n\n**CAS No.:** 684162\n\n**PEL (ppm):** 0.1\n\n**PEL (mg/m\u00b3):** 0.7\n\n> 684162 | S | Hexafluoroacetone; 1,1,1,3,3,3-hexafluoro-2-propanone | 0.1 | 0.7\n\nSource: \n", "cas_number": "684162", "file": "hexafluoroacetone-1-1-1-3-3-3-hexafluoro-2-propanone.md", "generated": true, "harvested": "2026-08-05", "id": "hexafluoroacetone-1-1-1-3-3-3-hexafluoro-2-propanone", "pel_mgm3": "0.7", "pel_ppm": "0.1", "source_quote": "684162 | S | Hexafluoroacetone; 1,1,1,3,3,3-hexafluoro-2-propanone | 0.1 | 0.7", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Hexafluoroacetone; 1,1,1,3,3,3-hexafluoro-2-propanone", "title": "Hexafluoroacetone; 1,1,1,3,3,3-hexafluoro-2-propanone \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Hexafluoroacetone\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Hexafluoroacetone\n\n**CAS No.:** 684-16-2\n\n> CAS No. 684-16-2\n\n**NIOSH REL (ppm):** TWA 0.1\n\n**NIOSH REL (mg/m\u00b3):** 0.7\n\n> NIOSH REL TWA 0.1 ppm (0.7 mg/m\u00b3) [skin]\n\nSource: \n", "cas_number": "684-16-2", "file": "hexafluoroacetone.md", "generated": true, "harvested": "2026-09-08", "id": "hexafluoroacetone", "quote_cas_number": "CAS No. 684-16-2", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Hexafluoroacetone", "rel_mgm3": "0.7", "rel_ppm": "TWA 0.1", "source_quote": "NIOSH REL TWA 0.1 ppm (0.7 mg/m\u00b3) [skin]", "sources": ["https://www.cdc.gov/niosh/npg/npgd0319.html"], "stale_after": "2027-09-08", "substance": "Hexafluoroacetone", "title": "Hexafluoroacetone \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Hexamethyl phosphoramide\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Hexamethyl phosphoramide\n\n**CAS No.:** 680-31-9\n\n> CAS No. 680-31-9\n\n**NIOSH REL, as stated:** Ca See Appendix A\n\n> NIOSH REL Ca See Appendix A\n\nSource: \n", "cas_number": "680-31-9", "file": "hexamethyl-phosphoramide.md", "generated": true, "harvested": "2026-09-08", "id": "hexamethyl-phosphoramide", "quote_cas_number": "CAS No. 680-31-9", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Hexamethyl phosphoramide", "rel_statement": "Ca See Appendix A", "source_quote": "NIOSH REL Ca See Appendix A", "sources": ["https://www.cdc.gov/niosh/npg/npgd0321.html"], "stale_after": "2027-09-08", "substance": "Hexamethyl phosphoramide", "title": "Hexamethyl phosphoramide \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Hexamethylene diisocyanate; HDI\n\n**CAS No.:** 822060\n\n**PEL (ppm):** 0.005\n\n**PEL (mg/m\u00b3):** 0.034\n\n> 822060 | | Hexamethylene diisocyanate; HDI | 0.005 | 0.034\n\nSource: \n", "cas_number": "822060", "file": "hexamethylene-diisocyanate-hdi.md", "generated": true, "harvested": "2026-08-05", "id": "hexamethylene-diisocyanate-hdi", "pel_mgm3": "0.034", "pel_ppm": "0.005", "source_quote": "822060 | | Hexamethylene diisocyanate; HDI | 0.005 | 0.034", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Hexamethylene diisocyanate; HDI", "title": "Hexamethylene diisocyanate; HDI \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Hexamethylene diisocyanate\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Hexamethylene diisocyanate\n\n**CAS No.:** 822-06-0\n\n> CAS No. 822-06-0\n\n**NIOSH REL (ppm):** TWA 0.005\n\n**NIOSH REL (mg/m\u00b3):** 0.035\n\n> NIOSH REL TWA 0.005 ppm (0.035 mg/m3) C 0.020 ppm (0.140 mg/m3) [10-minute]\n\nSource: \n", "cas_number": "822-06-0", "file": "hexamethylene-diisocyanate.md", "generated": true, "harvested": "2026-09-08", "id": "hexamethylene-diisocyanate", "quote_cas_number": "CAS No. 822-06-0", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Hexamethylene diisocyanate", "rel_mgm3": "0.035", "rel_ppm": "TWA 0.005", "source_quote": "NIOSH REL TWA 0.005 ppm (0.035 mg/m3) C 0.020 ppm (0.140 mg/m3) [10-minute]", "sources": ["https://www.cdc.gov/niosh/npg/npgd0320.html"], "stale_after": "2027-09-08", "substance": "Hexamethylene diisocyanate", "title": "Hexamethylene diisocyanate \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Hexone (Methyl isobutyl ketone)\n\n**CAS No.:** 108-10-1\n\n**PEL (ppm):** 100\n\n**PEL (mg/m\u00b3):** 410\n\n> Hexone (Methyl isobutyl ketone) | 108-10-1 | 100 | 410 | - |\n\nSource: \n", "cas_number": "108-10-1", "file": "hexone-methyl-isobutyl-ketone.md", "generated": true, "harvested": "2026-08-05", "id": "hexone-methyl-isobutyl-ketone", "pel_mgm3": "410", "pel_ppm": "100", "source_quote": "Hexone (Methyl isobutyl ketone) | 108-10-1 | 100 | 410 | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Hexone (Methyl isobutyl ketone)", "title": "Hexone (Methyl isobutyl ketone) \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Hexone; see Methyl isobutyl ketone\n\n**CAS No.:** 108101\n\n> 108101 | | Hexone; see Methyl isobutyl ketone\n\nSource: \n", "cas_number": "108101", "file": "hexone-see-methyl-isobutyl-ketone.md", "generated": true, "harvested": "2026-08-05", "id": "hexone-see-methyl-isobutyl-ketone", "source_quote": "108101 | | Hexone; see Methyl isobutyl ketone", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Hexone; see Methyl isobutyl ketone", "title": "Hexone; see Methyl isobutyl ketone \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Hexone\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Hexone\n\n**CAS No.:** 108-10-1\n\n> CAS No. 108-10-1\n\n**NIOSH REL (ppm):** TWA 50\n\n**NIOSH REL (mg/m\u00b3):** 205\n\n> NIOSH REL TWA 50 ppm (205 mg/m3) ST 75 ppm (300 mg/m3)\n\nSource: \n", "cas_number": "108-10-1", "file": "hexone.md", "generated": true, "harvested": "2026-09-08", "id": "hexone", "quote_cas_number": "CAS No. 108-10-1", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Hexone", "rel_mgm3": "205", "rel_ppm": "TWA 50", "source_quote": "NIOSH REL TWA 50 ppm (205 mg/m3) ST 75 ppm (300 mg/m3)", "sources": ["https://www.cdc.gov/niosh/npg/npgd0326.html"], "stale_after": "2027-09-08", "substance": "Hexone", "title": "Hexone \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Hexylene glycol\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Hexylene glycol\n\n**CAS No.:** 107-41-5\n\n> CAS No. 107-41-5\n\n**NIOSH REL (ppm):** C 25\n\n**NIOSH REL (mg/m\u00b3):** 125\n\n> NIOSH REL C 25 ppm (125 mg/m3)\n\nSource: \n", "cas_number": "107-41-5", "file": "hexylene-glycol-2.md", "generated": true, "harvested": "2026-09-08", "id": "hexylene-glycol-2", "quote_cas_number": "CAS No. 107-41-5", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Hexylene glycol", "rel_mgm3": "125", "rel_ppm": "C 25", "source_quote": "NIOSH REL C 25 ppm (125 mg/m3)", "sources": ["https://www.cdc.gov/niosh/npg/npgd0328.html"], "stale_after": "2027-09-08", "substance": "Hexylene glycol", "title": "Hexylene glycol \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Hexylene glycol\n\n**CAS No.:** 107415\n\n**PEL (ppm):** 25\n\n**PEL (mg/m\u00b3):** 125\n\n**Ceiling:** C\n\n> 107415 | | Hexylene glycol | 25 | 125 | C\n\nSource: \n", "cas_number": "107415", "ceiling": "C", "file": "hexylene-glycol.md", "generated": true, "harvested": "2026-08-05", "id": "hexylene-glycol", "pel_mgm3": "125", "pel_ppm": "25", "source_quote": "107415 | | Hexylene glycol | 25 | 125 | C", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Hexylene glycol", "title": "Hexylene glycol \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Hydrazine\n\n**CAS No.:** 302012\n\n**PEL (ppm):** 0.01\n\n**PEL (mg/m\u00b3):** 0.013\n\n> 302012 | S | Hydrazine | 0.01 | 0.013\n\nSource: \n", "cas_number": "302012", "file": "hydrazine-2.md", "generated": true, "harvested": "2026-08-05", "id": "hydrazine-2", "pel_mgm3": "0.013", "pel_ppm": "0.01", "source_quote": "302012 | S | Hydrazine | 0.01 | 0.013", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Hydrazine", "title": "Hydrazine \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Hydrazine\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Hydrazine\n\n**CAS No.:** 302-01-2\n\n> CAS No. 302-01-2\n\n**NIOSH REL (ppm):** C 0.03\n\n**NIOSH REL (mg/m\u00b3):** 0.04\n\n> NIOSH REL Ca C 0.03 ppm (0.04 mg/m3) [2-hour]\n\nSource: \n", "cas_number": "302-01-2", "file": "hydrazine-3.md", "generated": true, "harvested": "2026-09-08", "id": "hydrazine-3", "quote_cas_number": "CAS No. 302-01-2", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Hydrazine", "rel_mgm3": "0.04", "rel_ppm": "C 0.03", "source_quote": "NIOSH REL Ca C 0.03 ppm (0.04 mg/m3) [2-hour]", "sources": ["https://www.cdc.gov/niosh/npg/npgd0329.html"], "stale_after": "2027-09-08", "substance": "Hydrazine", "title": "Hydrazine \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Hydrazine\n\n**CAS No.:** 302-01-2\n\n**PEL (ppm):** 1\n\n**PEL (mg/m\u00b3):** 1.3\n\n> Hydrazine | 302-01-2 | 1 | 1.3 | X |\n\nSource: \n", "cas_number": "302-01-2", "file": "hydrazine.md", "generated": true, "harvested": "2026-08-05", "id": "hydrazine", "pel_mgm3": "1.3", "pel_ppm": "1", "source_quote": "Hydrazine | 302-01-2 | 1 | 1.3 | X |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Hydrazine", "title": "Hydrazine \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Hydrobromic acid; see Hydrogen bromide\n\n**CAS No.:** 10035106\n\n> 10035106 | | Hydrobromic acid; see Hydrogen bromide\n\nSource: \n", "cas_number": "10035106", "file": "hydrobromic-acid-see-hydrogen-bromide.md", "generated": true, "harvested": "2026-08-05", "id": "hydrobromic-acid-see-hydrogen-bromide", "source_quote": "10035106 | | Hydrobromic acid; see Hydrogen bromide", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Hydrobromic acid; see Hydrogen bromide", "title": "Hydrobromic acid; see Hydrogen bromide \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Hydrochloric acid; see Hydrogen chloride\n\n**CAS No.:** 7647010\n\n> 7647010 | | Hydrochloric acid; see Hydrogen chloride\n\nSource: \n", "cas_number": "7647010", "file": "hydrochloric-acid-see-hydrogen-chloride.md", "generated": true, "harvested": "2026-08-05", "id": "hydrochloric-acid-see-hydrogen-chloride", "source_quote": "7647010 | | Hydrochloric acid; see Hydrogen chloride", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Hydrochloric acid; see Hydrogen chloride", "title": "Hydrochloric acid; see Hydrogen chloride \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Hydrocyanic acid; see Hydrogen cyanide\n\n**CAS No.:** 74908\n\n> 74908 | | Hydrocyanic acid; see Hydrogen cyanide\n\nSource: \n", "cas_number": "74908", "file": "hydrocyanic-acid-see-hydrogen-cyanide.md", "generated": true, "harvested": "2026-08-05", "id": "hydrocyanic-acid-see-hydrogen-cyanide", "source_quote": "74908 | | Hydrocyanic acid; see Hydrogen cyanide", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Hydrocyanic acid; see Hydrogen cyanide", "title": "Hydrocyanic acid; see Hydrogen cyanide \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Hydrofluoric acid; see Hydrogen fluoride\n\n**CAS No.:** 7664393\n\n> 7664393 | | Hydrofluoric acid; see Hydrogen fluoride\n\nSource: \n", "cas_number": "7664393", "file": "hydrofluoric-acid-see-hydrogen-fluoride.md", "generated": true, "harvested": "2026-08-05", "id": "hydrofluoric-acid-see-hydrogen-fluoride", "source_quote": "7664393 | | Hydrofluoric acid; see Hydrogen fluoride", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Hydrofluoric acid; see Hydrogen fluoride", "title": "Hydrofluoric acid; see Hydrogen fluoride \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Hydrogen bromide\n\n**CAS No.:** 10035106\n\n**PEL (ppm):** 3\n\n**PEL (mg/m\u00b3):** 10\n\n**Ceiling:** C\n\n> 10035106 | | Hydrogen bromide | 3 | 10 | C\n\nSource: \n", "cas_number": "10035106", "ceiling": "C", "file": "hydrogen-bromide-2.md", "generated": true, "harvested": "2026-08-05", "id": "hydrogen-bromide-2", "pel_mgm3": "10", "pel_ppm": "3", "source_quote": "10035106 | | Hydrogen bromide | 3 | 10 | C", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Hydrogen bromide", "title": "Hydrogen bromide \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Hydrogen bromide\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Hydrogen bromide\n\n**CAS No.:** 10035-10-6\n\n> CAS No. 10035-10-6\n\n**NIOSH REL (ppm):** C 3\n\n**NIOSH REL (mg/m\u00b3):** 10\n\n> NIOSH REL C 3 ppm (10 mg/m3)\n\nSource: \n", "cas_number": "10035-10-6", "file": "hydrogen-bromide-3.md", "generated": true, "harvested": "2026-09-08", "id": "hydrogen-bromide-3", "quote_cas_number": "CAS No. 10035-10-6", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Hydrogen bromide", "rel_mgm3": "10", "rel_ppm": "C 3", "source_quote": "NIOSH REL C 3 ppm (10 mg/m3)", "sources": ["https://www.cdc.gov/niosh/npg/npgd0331.html"], "stale_after": "2027-09-08", "substance": "Hydrogen bromide", "title": "Hydrogen bromide \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Hydrogen bromide\n\n**CAS No.:** 10035-10-6\n\n**PEL (ppm):** 3\n\n**PEL (mg/m\u00b3):** 10\n\n> Hydrogen bromide | 10035-10-6 | 3 | 10 | - |\n\nSource: \n", "cas_number": "10035-10-6", "file": "hydrogen-bromide.md", "generated": true, "harvested": "2026-08-05", "id": "hydrogen-bromide", "pel_mgm3": "10", "pel_ppm": "3", "source_quote": "Hydrogen bromide | 10035-10-6 | 3 | 10 | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Hydrogen bromide", "title": "Hydrogen bromide \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Hydrogen chloride\n\n**CAS No.:** 7647010\n\n**PEL (ppm):** 0.3\n\n**PEL (mg/m\u00b3):** 0.45\n\n**Ceiling:** 2 ppm\n\n> 7647010 | | Hydrogen chloride | 0.3 | 0.45 | 2 ppm\n\nSource: \n", "cas_number": "7647010", "ceiling": "2 ppm", "file": "hydrogen-chloride-2.md", "generated": true, "harvested": "2026-08-05", "id": "hydrogen-chloride-2", "pel_mgm3": "0.45", "pel_ppm": "0.3", "source_quote": "7647010 | | Hydrogen chloride | 0.3 | 0.45 | 2 ppm", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Hydrogen chloride", "title": "Hydrogen chloride \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Hydrogen chloride\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Hydrogen chloride\n\n**CAS No.:** 7647-01-0\n\n> CAS No. 7647-01-0\n\n**NIOSH REL (ppm):** C 5\n\n**NIOSH REL (mg/m\u00b3):** 7\n\n> NIOSH REL C 5 ppm (7 mg/m3)\n\nSource: \n", "cas_number": "7647-01-0", "file": "hydrogen-chloride-3.md", "generated": true, "harvested": "2026-09-08", "id": "hydrogen-chloride-3", "quote_cas_number": "CAS No. 7647-01-0", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Hydrogen chloride", "rel_mgm3": "7", "rel_ppm": "C 5", "source_quote": "NIOSH REL C 5 ppm (7 mg/m3)", "sources": ["https://www.cdc.gov/niosh/npg/npgd0332.html"], "stale_after": "2027-09-08", "substance": "Hydrogen chloride", "title": "Hydrogen chloride \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Hydrogen chloride\n\n**CAS No.:** 7647-01-0\n\n**PEL (ppm):** (C)5\n\n**PEL (mg/m\u00b3):** (C)7\n\n> Hydrogen chloride | 7647-01-0 | (C)5 | (C)7 | - |\n\nSource: \n", "cas_number": "7647-01-0", "file": "hydrogen-chloride.md", "generated": true, "harvested": "2026-08-05", "id": "hydrogen-chloride", "pel_mgm3": "(C)7", "pel_ppm": "(C)5", "source_quote": "Hydrogen chloride | 7647-01-0 | (C)5 | (C)7 | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Hydrogen chloride", "title": "Hydrogen chloride \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Hydrogen cyanide\n\n**CAS No.:** 74908\n\n**PEL (ppm):** 4.7\n\n**PEL (mg/m\u00b3):** 5\n\n**Ceiling:** C\n\n> 74908 | S | Hydrogen cyanide | 4.7 | 5 | C\n\nSource: \n", "cas_number": "74908", "ceiling": "C", "file": "hydrogen-cyanide-2.md", "generated": true, "harvested": "2026-08-05", "id": "hydrogen-cyanide-2", "pel_mgm3": "5", "pel_ppm": "4.7", "source_quote": "74908 | S | Hydrogen cyanide | 4.7 | 5 | C", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Hydrogen cyanide", "title": "Hydrogen cyanide \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Hydrogen cyanide\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Hydrogen cyanide\n\n**CAS No.:** 74-90-8\n\n> CAS No. 74-90-8\n\n**NIOSH REL (ppm):** ST 4.7\n\n**NIOSH REL (mg/m\u00b3):** 5\n\n> NIOSH REL ST 4.7 ppm (5 mg/m3) [skin]\n\nSource: \n", "cas_number": "74-90-8", "file": "hydrogen-cyanide-3.md", "generated": true, "harvested": "2026-09-08", "id": "hydrogen-cyanide-3", "quote_cas_number": "CAS No. 74-90-8", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Hydrogen cyanide", "rel_mgm3": "5", "rel_ppm": "ST 4.7", "source_quote": "NIOSH REL ST 4.7 ppm (5 mg/m3) [skin]", "sources": ["https://www.cdc.gov/niosh/npg/npgd0333.html"], "stale_after": "2027-09-08", "substance": "Hydrogen cyanide", "title": "Hydrogen cyanide \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Hydrogen cyanide\n\n**CAS No.:** 74-90-8\n\n**PEL (ppm):** 10\n\n**PEL (mg/m\u00b3):** 11\n\n> Hydrogen cyanide | 74-90-8 | 10 | 11 | X |\n\nSource: \n", "cas_number": "74-90-8", "file": "hydrogen-cyanide.md", "generated": true, "harvested": "2026-08-05", "id": "hydrogen-cyanide", "pel_mgm3": "11", "pel_ppm": "10", "source_quote": "Hydrogen cyanide | 74-90-8 | 10 | 11 | X |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Hydrogen cyanide", "title": "Hydrogen cyanide \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Hydrogen fluoride, as F\n\n**CAS No.:** 7664393\n\n**PEL (ppm):** 0.4\n\n**PEL (mg/m\u00b3):** 0.33\n\n**STEL (ppm):** 1\n\n**STEL (mg/m\u00b3):** 0.83\n\n> 7664393 | S | Hydrogen fluoride, as F | 0.4 | 0.33 | | 1 | 0.83\n\nSource: \n", "cas_number": "7664393", "file": "hydrogen-fluoride-as-f-2.md", "generated": true, "harvested": "2026-08-05", "id": "hydrogen-fluoride-as-f-2", "pel_mgm3": "0.33", "pel_ppm": "0.4", "source_quote": "7664393 | S | Hydrogen fluoride, as F | 0.4 | 0.33 | | 1 | 0.83", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "stel_mgm3": "0.83", "stel_ppm": "1", "substance": "Hydrogen fluoride, as F", "title": "Hydrogen fluoride, as F \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Hydrogen fluoride (as F)\n\n**CAS No.:** 7664-39-3\n\n> Hydrogen fluoride (as F) | 7664-39-3 | - | (2) | - |\n\nSource: \n", "cas_number": "7664-39-3", "file": "hydrogen-fluoride-as-f.md", "generated": true, "harvested": "2026-08-05", "id": "hydrogen-fluoride-as-f", "source_quote": "Hydrogen fluoride (as F) | 7664-39-3 | - | (2) | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Hydrogen fluoride (as F)", "title": "Hydrogen fluoride (as F) \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Hydrogen fluoride\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Hydrogen fluoride\n\n**CAS No.:** 7664-39-3\n\n> CAS No. 7664-39-3\n\n**NIOSH REL (ppm):** TWA 3\n\n**NIOSH REL (mg/m\u00b3):** 2.5\n\n> NIOSH REL TWA 3 ppm (2.5 mg/m3) C 6 ppm (5 mg/m3) [15-minute]\n\nSource: \n", "cas_number": "7664-39-3", "file": "hydrogen-fluoride.md", "generated": true, "harvested": "2026-09-08", "id": "hydrogen-fluoride", "quote_cas_number": "CAS No. 7664-39-3", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Hydrogen fluoride", "rel_mgm3": "2.5", "rel_ppm": "TWA 3", "source_quote": "NIOSH REL TWA 3 ppm (2.5 mg/m3) C 6 ppm (5 mg/m3) [15-minute]", "sources": ["https://www.cdc.gov/niosh/npg/npgd0334.html"], "stale_after": "2027-09-08", "substance": "Hydrogen fluoride", "title": "Hydrogen fluoride \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Hydrogen peroxide\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Hydrogen peroxide\n\n**CAS No.:** 7722-84-1\n\n> CAS No. 7722-84-1\n\n**NIOSH REL (ppm):** TWA 1\n\n**NIOSH REL (mg/m\u00b3):** 1.4\n\n> NIOSH REL TWA 1 ppm (1.4 mg/m3)\n\nSource: \n", "cas_number": "7722-84-1", "file": "hydrogen-peroxide-2.md", "generated": true, "harvested": "2026-09-08", "id": "hydrogen-peroxide-2", "quote_cas_number": "CAS No. 7722-84-1", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Hydrogen peroxide", "rel_mgm3": "1.4", "rel_ppm": "TWA 1", "source_quote": "NIOSH REL TWA 1 ppm (1.4 mg/m3)", "sources": ["https://www.cdc.gov/niosh/npg/npgd0335.html"], "stale_after": "2027-09-08", "substance": "Hydrogen peroxide", "title": "Hydrogen peroxide \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Hydrogen peroxide, as H$2O$2\n\n**CAS No.:** 7722841\n\n**PEL (ppm):** 1\n\n**PEL (mg/m\u00b3):** 1.4\n\n> 7722841 | | Hydrogen peroxide, as H$2O$2 | 1 | 1.4\n\nSource: \n", "cas_number": "7722841", "file": "hydrogen-peroxide-as-h-2-o-2.md", "generated": true, "harvested": "2026-08-05", "id": "hydrogen-peroxide-as-h-2-o-2", "pel_mgm3": "1.4", "pel_ppm": "1", "source_quote": "7722841 | | Hydrogen peroxide, as H$2O$2 | 1 | 1.4", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Hydrogen peroxide, as H$2O$2", "title": "Hydrogen peroxide, as H $2 O $2 \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Hydrogen peroxide\n\n**CAS No.:** 7722-84-1\n\n**PEL (ppm):** 1\n\n**PEL (mg/m\u00b3):** 1.4\n\n> Hydrogen peroxide | 7722-84-1 | 1 | 1.4 | - |\n\nSource: \n", "cas_number": "7722-84-1", "file": "hydrogen-peroxide.md", "generated": true, "harvested": "2026-08-05", "id": "hydrogen-peroxide", "pel_mgm3": "1.4", "pel_ppm": "1", "source_quote": "Hydrogen peroxide | 7722-84-1 | 1 | 1.4 | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Hydrogen peroxide", "title": "Hydrogen peroxide \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Hydrogen selenide, as Se\n\n**CAS No.:** 7783075\n\n**PEL (ppm):** 0.05\n\n**PEL (mg/m\u00b3):** 0.2\n\n> 7783075 | | Hydrogen selenide, as Se | 0.05 | 0.2\n\nSource: \n", "cas_number": "7783075", "file": "hydrogen-selenide-as-se-2.md", "generated": true, "harvested": "2026-08-05", "id": "hydrogen-selenide-as-se-2", "pel_mgm3": "0.2", "pel_ppm": "0.05", "source_quote": "7783075 | | Hydrogen selenide, as Se | 0.05 | 0.2", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Hydrogen selenide, as Se", "title": "Hydrogen selenide, as Se \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Hydrogen selenide (as Se)\n\n**CAS No.:** 7783-07-5\n\n**PEL (ppm):** 0.05\n\n**PEL (mg/m\u00b3):** 0.2\n\n> Hydrogen selenide (as Se) | 7783-07-5 | 0.05 | 0.2 | - |\n\nSource: \n", "cas_number": "7783-07-5", "file": "hydrogen-selenide-as-se.md", "generated": true, "harvested": "2026-08-05", "id": "hydrogen-selenide-as-se", "pel_mgm3": "0.2", "pel_ppm": "0.05", "source_quote": "Hydrogen selenide (as Se) | 7783-07-5 | 0.05 | 0.2 | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Hydrogen selenide (as Se)", "title": "Hydrogen selenide (as Se) \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Hydrogen selenide\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Hydrogen selenide\n\n**CAS No.:** 7783-07-5\n\n> CAS No. 7783-07-5\n\n**NIOSH REL (ppm):** TWA 0.05\n\n**NIOSH REL (mg/m\u00b3):** 0.2\n\n> NIOSH REL TWA 0.05 ppm (0.2 mg/m3)\n\nSource: \n", "cas_number": "7783-07-5", "file": "hydrogen-selenide.md", "generated": true, "harvested": "2026-09-08", "id": "hydrogen-selenide", "quote_cas_number": "CAS No. 7783-07-5", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Hydrogen selenide", "rel_mgm3": "0.2", "rel_ppm": "TWA 0.05", "source_quote": "NIOSH REL TWA 0.05 ppm (0.2 mg/m3)", "sources": ["https://www.cdc.gov/niosh/npg/npgd0336.html"], "stale_after": "2027-09-08", "substance": "Hydrogen selenide", "title": "Hydrogen selenide \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Hydrogen sulfide\n\n**CAS No.:** 7783064\n\n**PEL (ppm):** 10\n\n**PEL (mg/m\u00b3):** 14\n\n**Ceiling:** 50 ppm\n\n**STEL (ppm):** 15\n\n**STEL (mg/m\u00b3):** 21\n\n> 7783064 | | Hydrogen sulfide | 10 | 14 | 50 ppm | 15 | 21\n\nSource: \n", "cas_number": "7783064", "ceiling": "50 ppm", "file": "hydrogen-sulfide-2.md", "generated": true, "harvested": "2026-08-05", "id": "hydrogen-sulfide-2", "pel_mgm3": "14", "pel_ppm": "10", "source_quote": "7783064 | | Hydrogen sulfide | 10 | 14 | 50 ppm | 15 | 21", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "stel_mgm3": "21", "stel_ppm": "15", "substance": "Hydrogen sulfide", "title": "Hydrogen sulfide \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Hydrogen sulfide\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Hydrogen sulfide\n\n**CAS No.:** 7783-06-4\n\n> CAS No. 7783-06-4\n\n**NIOSH REL (ppm):** C 10\n\n**NIOSH REL (mg/m\u00b3):** 15\n\n> NIOSH REL C 10 ppm (15 mg/m3) [10-minute]\n\nSource: \n", "cas_number": "7783-06-4", "file": "hydrogen-sulfide-3.md", "generated": true, "harvested": "2026-09-08", "id": "hydrogen-sulfide-3", "quote_cas_number": "CAS No. 7783-06-4", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Hydrogen sulfide", "rel_mgm3": "15", "rel_ppm": "C 10", "source_quote": "NIOSH REL C 10 ppm (15 mg/m3) [10-minute]", "sources": ["https://www.cdc.gov/niosh/npg/npgd0337.html"], "stale_after": "2027-09-08", "substance": "Hydrogen sulfide", "title": "Hydrogen sulfide \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Hydrogen sulfide\n\n**CAS No.:** 7783-06-4\n\n> Hydrogen sulfide | 7783-06-4 | - | (2) | - |\n\nSource: \n", "cas_number": "7783-06-4", "file": "hydrogen-sulfide.md", "generated": true, "harvested": "2026-08-05", "id": "hydrogen-sulfide", "source_quote": "Hydrogen sulfide | 7783-06-4 | - | (2) | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Hydrogen sulfide", "title": "Hydrogen sulfide \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Hydrogen\n\n**CAS No.:** 1333740\n\n> 1333740 | | Hydrogen | (h) | --\n\nSource: \n", "cas_number": "1333740", "file": "hydrogen.md", "generated": true, "harvested": "2026-08-05", "id": "hydrogen", "source_quote": "1333740 | | Hydrogen | (h) | --", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Hydrogen", "title": "Hydrogen \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Hydrogenated terphenyls\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Hydrogenated terphenyls\n\n**CAS No.:** 61788-32-7\n\n> CAS No. 61788-32-7\n\n**NIOSH REL (ppm):** TWA 0.5\n\n**NIOSH REL (mg/m\u00b3):** 5\n\n> NIOSH REL TWA 0.5 ppm (5 mg/m3)\n\nSource: \n", "cas_number": "61788-32-7", "file": "hydrogenated-terphenyls-2.md", "generated": true, "harvested": "2026-09-08", "id": "hydrogenated-terphenyls-2", "quote_cas_number": "CAS No. 61788-32-7", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Hydrogenated terphenyls", "rel_mgm3": "5", "rel_ppm": "TWA 0.5", "source_quote": "NIOSH REL TWA 0.5 ppm (5 mg/m3)", "sources": ["https://www.cdc.gov/niosh/npg/npgd0330.html"], "stale_after": "2027-09-08", "substance": "Hydrogenated terphenyls", "title": "Hydrogenated terphenyls \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Hydrogenated terphenyls\n\n**CAS No.:** 61788327\n\n**PEL (ppm):** 0.5\n\n**PEL (mg/m\u00b3):** 5\n\n> 61788327 | | Hydrogenated terphenyls | 0.5 | 5\n\nSource: \n", "cas_number": "61788327", "file": "hydrogenated-terphenyls.md", "generated": true, "harvested": "2026-08-05", "id": "hydrogenated-terphenyls", "pel_mgm3": "5", "pel_ppm": "0.5", "source_quote": "61788327 | | Hydrogenated terphenyls | 0.5 | 5", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Hydrogenated terphenyls", "title": "Hydrogenated terphenyls \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Hydroquinone; 1,4-benezendiol\n\n**CAS No.:** 123319\n\n**PEL (mg/m\u00b3):** 2\n\n> 123319 | | Hydroquinone; 1,4-benezendiol | -- | 2\n\nSource: \n", "cas_number": "123319", "file": "hydroquinone-1-4-benezendiol.md", "generated": true, "harvested": "2026-08-05", "id": "hydroquinone-1-4-benezendiol", "pel_mgm3": "2", "source_quote": "123319 | | Hydroquinone; 1,4-benezendiol | -- | 2", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Hydroquinone; 1,4-benezendiol", "title": "Hydroquinone; 1,4-benezendiol \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Hydroquinone\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Hydroquinone\n\n**CAS No.:** 123-31-9\n\n> CAS No. 123-31-9\n\n**NIOSH REL (mg/m\u00b3):** C 2\n\n> NIOSH REL C 2 mg/m3 [15-minute]\n\nSource: \n", "cas_number": "123-31-9", "file": "hydroquinone-2.md", "generated": true, "harvested": "2026-09-08", "id": "hydroquinone-2", "quote_cas_number": "CAS No. 123-31-9", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Hydroquinone", "rel_mgm3": "C 2", "source_quote": "NIOSH REL C 2 mg/m3 [15-minute]", "sources": ["https://www.cdc.gov/niosh/npg/npgd0338.html"], "stale_after": "2027-09-08", "substance": "Hydroquinone", "title": "Hydroquinone \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Hydroquinone\n\n**CAS No.:** 123-31-9\n\n**PEL (mg/m\u00b3):** 2\n\n> Hydroquinone | 123-31-9 | - | 2 | - |\n\nSource: \n", "cas_number": "123-31-9", "file": "hydroquinone.md", "generated": true, "harvested": "2026-08-05", "id": "hydroquinone", "pel_mgm3": "2", "source_quote": "Hydroquinone | 123-31-9 | - | 2 | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Hydroquinone", "title": "Hydroquinone \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Indene\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Indene\n\n**CAS No.:** 95-13-6\n\n> CAS No. 95-13-6\n\n**NIOSH REL (ppm):** TWA 10\n\n**NIOSH REL (mg/m\u00b3):** 45\n\n> NIOSH REL TWA 10 ppm (45 mg/m3)\n\nSource: \n", "cas_number": "95-13-6", "file": "indene-2.md", "generated": true, "harvested": "2026-09-08", "id": "indene-2", "quote_cas_number": "CAS No. 95-13-6", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Indene", "rel_mgm3": "45", "rel_ppm": "TWA 10", "source_quote": "NIOSH REL TWA 10 ppm (45 mg/m3)", "sources": ["https://www.cdc.gov/niosh/npg/npgd0340.html"], "stale_after": "2027-09-08", "substance": "Indene", "title": "Indene \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Indene\n\n**CAS No.:** 95136\n\n**PEL (ppm):** 10\n\n**PEL (mg/m\u00b3):** 48\n\n> 95136 | | Indene | 10 | 48\n\nSource: \n", "cas_number": "95136", "file": "indene.md", "generated": true, "harvested": "2026-08-05", "id": "indene", "pel_mgm3": "48", "pel_ppm": "10", "source_quote": "95136 | | Indene | 10 | 48", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Indene", "title": "Indene \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Indium\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Indium\n\n**CAS No.:** 7440-74-6\n\n> CAS No. 7440-74-6\n\n**NIOSH REL (mg/m\u00b3):** TWA 0.1\n\n> NIOSH REL TWA 0.1 mg/m3\n\nSource: \n", "cas_number": "7440-74-6", "file": "indium-2.md", "generated": true, "harvested": "2026-09-08", "id": "indium-2", "quote_cas_number": "CAS No. 7440-74-6", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Indium", "rel_mgm3": "TWA 0.1", "source_quote": "NIOSH REL TWA 0.1 mg/m3", "sources": ["https://www.cdc.gov/niosh/npg/npgd0341.html"], "stale_after": "2027-09-08", "substance": "Indium", "title": "Indium \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Indium\n\n**CAS No.:** 7440746\n\n**PEL (mg/m\u00b3):** 0.1\n\n> 7440746 | | Indium | -- | 0.1\n\nSource: \n", "cas_number": "7440746", "file": "indium.md", "generated": true, "harvested": "2026-08-05", "id": "indium", "pel_mgm3": "0.1", "source_quote": "7440746 | | Indium | -- | 0.1", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Indium", "title": "Indium \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Iodine\n\n**CAS No.:** 7553562\n\n**PEL (ppm):** 0.1\n\n**PEL (mg/m\u00b3):** 1\n\n**Ceiling:** C\n\n> 7553562 | | Iodine | 0.1 | 1 | C\n\nSource: \n", "cas_number": "7553562", "ceiling": "C", "file": "iodine-2.md", "generated": true, "harvested": "2026-08-05", "id": "iodine-2", "pel_mgm3": "1", "pel_ppm": "0.1", "source_quote": "7553562 | | Iodine | 0.1 | 1 | C", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Iodine", "title": "Iodine \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Iodine\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Iodine\n\n**CAS No.:** 7553-56-2\n\n> CAS No. 7553-56-2\n\n**NIOSH REL (ppm):** C 0.1\n\n**NIOSH REL (mg/m\u00b3):** 1\n\n> NIOSH REL C 0.1 ppm (1 mg/m3)\n\nSource: \n", "cas_number": "7553-56-2", "file": "iodine-3.md", "generated": true, "harvested": "2026-09-08", "id": "iodine-3", "quote_cas_number": "CAS No. 7553-56-2", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Iodine", "rel_mgm3": "1", "rel_ppm": "C 0.1", "source_quote": "NIOSH REL C 0.1 ppm (1 mg/m3)", "sources": ["https://www.cdc.gov/niosh/npg/npgd0342.html"], "stale_after": "2027-09-08", "substance": "Iodine", "title": "Iodine \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Iodine\n\n**CAS No.:** 7553-56-2\n\n**PEL (ppm):** (C)0.1\n\n**PEL (mg/m\u00b3):** (C)1\n\n> Iodine | 7553-56-2 | (C)0.1 | (C)1 | - |\n\nSource: \n", "cas_number": "7553-56-2", "file": "iodine.md", "generated": true, "harvested": "2026-08-05", "id": "iodine", "pel_mgm3": "(C)1", "pel_ppm": "(C)0.1", "source_quote": "Iodine | 7553-56-2 | (C)0.1 | (C)1 | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Iodine", "title": "Iodine \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Iodoform\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Iodoform\n\n**CAS No.:** 75-47-8\n\n> CAS No. 75-47-8\n\n**NIOSH REL (ppm):** TWA 0.6\n\n**NIOSH REL (mg/m\u00b3):** 10\n\n> NIOSH REL TWA 0.6 ppm (10 mg/m3)\n\nSource: \n", "cas_number": "75-47-8", "file": "iodoform-2.md", "generated": true, "harvested": "2026-09-08", "id": "iodoform-2", "quote_cas_number": "CAS No. 75-47-8", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Iodoform", "rel_mgm3": "10", "rel_ppm": "TWA 0.6", "source_quote": "NIOSH REL TWA 0.6 ppm (10 mg/m3)", "sources": ["https://www.cdc.gov/niosh/npg/npgd0343.html"], "stale_after": "2027-09-08", "substance": "Iodoform", "title": "Iodoform \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Iodoform\n\n**CAS No.:** 75478\n\n**PEL (ppm):** 0.6\n\n**PEL (mg/m\u00b3):** 10\n\n> 75478 | | Iodoform | 0.6 | 10\n\nSource: \n", "cas_number": "75478", "file": "iodoform.md", "generated": true, "harvested": "2026-08-05", "id": "iodoform", "pel_mgm3": "10", "pel_ppm": "0.6", "source_quote": "75478 | | Iodoform | 0.6 | 10", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Iodoform", "title": "Iodoform \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** IPDI; see Isophorone diisocyanate\n\n**CAS No.:** 4098719\n\n> 4098719 | | IPDI; see Isophorone diisocyanate\n\nSource: \n", "cas_number": "4098719", "file": "ipdi-see-isophorone-diisocyanate.md", "generated": true, "harvested": "2026-08-05", "id": "ipdi-see-isophorone-diisocyanate", "source_quote": "4098719 | | IPDI; see Isophorone diisocyanate", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "IPDI; see Isophorone diisocyanate", "title": "IPDI; see Isophorone diisocyanate \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Iron oxide dust and fume (as Fe)\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Iron oxide dust and fume (as Fe)\n\n**CAS No.:** 1309-37-1\n\n> CAS No. 1309-37-1\n\n**NIOSH REL (mg/m\u00b3):** TWA 5\n\n> NIOSH REL TWA 5 mg/m3\n\nSource: \n", "cas_number": "1309-37-1", "file": "iron-oxide-dust-and-fume-as-fe.md", "generated": true, "harvested": "2026-09-08", "id": "iron-oxide-dust-and-fume-as-fe", "quote_cas_number": "CAS No. 1309-37-1", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Iron oxide dust and fume (as Fe)", "rel_mgm3": "TWA 5", "source_quote": "NIOSH REL TWA 5 mg/m3", "sources": ["https://www.cdc.gov/niosh/npg/npgd0344.html"], "stale_after": "2027-09-08", "substance": "Iron oxide dust and fume (as Fe)", "title": "Iron oxide dust and fume (as Fe) \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Iron oxide fume\n\n**CAS No.:** 1309371\n\n**PEL (mg/m\u00b3):** 5\n\n> 1309371 | | Iron oxide fume | -- | 5\n\nSource: \n", "cas_number": "1309371", "file": "iron-oxide-fume-2.md", "generated": true, "harvested": "2026-08-05", "id": "iron-oxide-fume-2", "pel_mgm3": "5", "source_quote": "1309371 | | Iron oxide fume | -- | 5", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Iron oxide fume", "title": "Iron oxide fume \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Iron oxide fume\n\n**CAS No.:** 1309-37-1\n\n**PEL (mg/m\u00b3):** 10\n\n> Iron oxide fume | 1309-37-1 | - | 10 | - |\n\nSource: \n", "cas_number": "1309-37-1", "file": "iron-oxide-fume.md", "generated": true, "harvested": "2026-08-05", "id": "iron-oxide-fume", "pel_mgm3": "10", "source_quote": "Iron oxide fume | 1309-37-1 | - | 10 | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Iron oxide fume", "title": "Iron oxide fume \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Iron pentacarbonyl (as Fe)\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Iron pentacarbonyl (as Fe)\n\n**CAS No.:** 13463-40-6\n\n> CAS No. 13463-40-6\n\n**NIOSH REL (ppm):** TWA 0.1\n\n**NIOSH REL (mg/m\u00b3):** 0.23\n\n> NIOSH REL TWA 0.1 ppm (0.23 mg/m\u00b3) ST 0.2 ppm (0.45 mg/m\u00b3)\n\nSource: \n", "cas_number": "13463-40-6", "file": "iron-pentacarbonyl-as-fe-2.md", "generated": true, "harvested": "2026-09-08", "id": "iron-pentacarbonyl-as-fe-2", "quote_cas_number": "CAS No. 13463-40-6", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Iron pentacarbonyl (as Fe)", "rel_mgm3": "0.23", "rel_ppm": "TWA 0.1", "source_quote": "NIOSH REL TWA 0.1 ppm (0.23 mg/m\u00b3) ST 0.2 ppm (0.45 mg/m\u00b3)", "sources": ["https://www.cdc.gov/niosh/npg/npgd0345.html"], "stale_after": "2027-09-08", "substance": "Iron pentacarbonyl (as Fe)", "title": "Iron pentacarbonyl (as Fe) \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Iron pentacarbonyl, as Fe\n\n**CAS No.:** 13463406\n\n**PEL (ppm):** 0.1\n\n**PEL (mg/m\u00b3):** 0.8\n\n**STEL (ppm):** 0.2\n\n**STEL (mg/m\u00b3):** 1.6\n\n> 13463406 | | Iron pentacarbonyl, as Fe | 0.1 | 0.8 | | 0.2 | 1.6\n\nSource: \n", "cas_number": "13463406", "file": "iron-pentacarbonyl-as-fe.md", "generated": true, "harvested": "2026-08-05", "id": "iron-pentacarbonyl-as-fe", "pel_mgm3": "0.8", "pel_ppm": "0.1", "source_quote": "13463406 | | Iron pentacarbonyl, as Fe | 0.1 | 0.8 | | 0.2 | 1.6", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "stel_mgm3": "1.6", "stel_ppm": "0.2", "substance": "Iron pentacarbonyl, as Fe", "title": "Iron pentacarbonyl, as Fe \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Isoamyl acetate\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Isoamyl acetate\n\n**CAS No.:** 123-92-2\n\n> CAS No. 123-92-2\n\n**NIOSH REL (ppm):** TWA 100\n\n**NIOSH REL (mg/m\u00b3):** 525\n\n> NIOSH REL TWA 100 ppm (525 mg/m3)\n\nSource: \n", "cas_number": "123-92-2", "file": "isoamyl-acetate-2.md", "generated": true, "harvested": "2026-09-08", "id": "isoamyl-acetate-2", "quote_cas_number": "CAS No. 123-92-2", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Isoamyl acetate", "rel_mgm3": "525", "rel_ppm": "TWA 100", "source_quote": "NIOSH REL TWA 100 ppm (525 mg/m3)", "sources": ["https://www.cdc.gov/niosh/npg/npgd0347.html"], "stale_after": "2027-09-08", "substance": "Isoamyl acetate", "title": "Isoamyl acetate \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Isoamyl acetate; 3-methylbutyl acetate; see Pentyl acetate\n\n**CAS No.:** 123922\n\n> 123922 | | Isoamyl acetate; 3-methylbutyl acetate; see Pentyl acetate\n\nSource: \n", "cas_number": "123922", "file": "isoamyl-acetate-3-methylbutyl-acetate-see-pentyl-acetate.md", "generated": true, "harvested": "2026-08-05", "id": "isoamyl-acetate-3-methylbutyl-acetate-see-pentyl-acetate", "source_quote": "123922 | | Isoamyl acetate; 3-methylbutyl acetate; see Pentyl acetate", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Isoamyl acetate; 3-methylbutyl acetate; see Pentyl acetate", "title": "Isoamyl acetate; 3-methylbutyl acetate; see Pentyl acetate \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Isoamyl acetate\n\n**CAS No.:** 123-92-2\n\n**PEL (ppm):** 100\n\n**PEL (mg/m\u00b3):** 525\n\n> Isoamyl acetate | 123-92-2 | 100 | 525 | - |\n\nSource: \n", "cas_number": "123-92-2", "file": "isoamyl-acetate.md", "generated": true, "harvested": "2026-08-05", "id": "isoamyl-acetate", "pel_mgm3": "525", "pel_ppm": "100", "source_quote": "Isoamyl acetate | 123-92-2 | 100 | 525 | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Isoamyl acetate", "title": "Isoamyl acetate \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Isoamyl alcohol; 3-methylbutanol\n\n**CAS No.:** 123513\n\n**PEL (ppm):** 100\n\n**PEL (mg/m\u00b3):** 360\n\n**STEL (ppm):** 125\n\n**STEL (mg/m\u00b3):** 450\n\n> 123513 | | Isoamyl alcohol; 3-methylbutanol | 100 | 360 | | 125 | 450\n\nSource: \n", "cas_number": "123513", "file": "isoamyl-alcohol-3-methylbutanol.md", "generated": true, "harvested": "2026-08-05", "id": "isoamyl-alcohol-3-methylbutanol", "pel_mgm3": "360", "pel_ppm": "100", "source_quote": "123513 | | Isoamyl alcohol; 3-methylbutanol | 100 | 360 | | 125 | 450", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "stel_mgm3": "450", "stel_ppm": "125", "substance": "Isoamyl alcohol; 3-methylbutanol", "title": "Isoamyl alcohol; 3-methylbutanol \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Isoamyl alcohol (primary and secondary)\n\n**CAS No.:** 123-51-3\n\n**PEL (ppm):** 100\n\n**PEL (mg/m\u00b3):** 360\n\n> Isoamyl alcohol (primary and secondary) | 123-51-3 | 100 | 360 | - |\n\nSource: \n", "cas_number": "123-51-3", "file": "isoamyl-alcohol-primary-and-secondary.md", "generated": true, "harvested": "2026-08-05", "id": "isoamyl-alcohol-primary-and-secondary", "pel_mgm3": "360", "pel_ppm": "100", "source_quote": "Isoamyl alcohol (primary and secondary) | 123-51-3 | 100 | 360 | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Isoamyl alcohol (primary and secondary)", "title": "Isoamyl alcohol (primary and secondary) \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Isoamyl alcohol (primary)\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Isoamyl alcohol (primary)\n\n**CAS No.:** 123-51-3\n\n> CAS No. 123-51-3\n\n**NIOSH REL (ppm):** TWA 100\n\n**NIOSH REL (mg/m\u00b3):** 360\n\n> NIOSH REL TWA 100 ppm (360 mg/m3) ST 125 ppm (450 mg/m3)\n\nSource: \n", "cas_number": "123-51-3", "file": "isoamyl-alcohol-primary.md", "generated": true, "harvested": "2026-09-08", "id": "isoamyl-alcohol-primary", "quote_cas_number": "CAS No. 123-51-3", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Isoamyl alcohol (primary)", "rel_mgm3": "360", "rel_ppm": "TWA 100", "source_quote": "NIOSH REL TWA 100 ppm (360 mg/m3) ST 125 ppm (450 mg/m3)", "sources": ["https://www.cdc.gov/niosh/npg/npgd0348.html"], "stale_after": "2027-09-08", "substance": "Isoamyl alcohol (primary)", "title": "Isoamyl alcohol (primary) \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Isoamyl alcohol (secondary)\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Isoamyl alcohol (secondary)\n\n**CAS No.:** 6032-29-7\n\n> CAS No. 6032-29-7\n\n**NIOSH REL (ppm):** TWA 100\n\n**NIOSH REL (mg/m\u00b3):** 360\n\n> NIOSH REL TWA 100 ppm (360 mg/m3) ST 125 ppm (450 mg/m3)\n\nSource: \n", "cas_number": "6032-29-7", "file": "isoamyl-alcohol-secondary.md", "generated": true, "harvested": "2026-09-08", "id": "isoamyl-alcohol-secondary", "quote_cas_number": "CAS No. 6032-29-7", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Isoamyl alcohol (secondary)", "rel_mgm3": "360", "rel_ppm": "TWA 100", "source_quote": "NIOSH REL TWA 100 ppm (360 mg/m3) ST 125 ppm (450 mg/m3)", "sources": ["https://www.cdc.gov/niosh/npg/npgd0349.html"], "stale_after": "2027-09-08", "substance": "Isoamyl alcohol (secondary)", "title": "Isoamyl alcohol (secondary) \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Isobutane\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Isobutane\n\n**CAS No.:** 75-28-5\n\n> CAS No. 75-28-5\n\n**NIOSH REL (ppm):** TWA 800\n\n**NIOSH REL (mg/m\u00b3):** 1900\n\n> NIOSH REL TWA 800 ppm (1900 mg/m3)\n\nSource: \n", "cas_number": "75-28-5", "file": "isobutane.md", "generated": true, "harvested": "2026-09-08", "id": "isobutane", "quote_cas_number": "CAS No. 75-28-5", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Isobutane", "rel_mgm3": "1900", "rel_ppm": "TWA 800", "source_quote": "NIOSH REL TWA 800 ppm (1900 mg/m3)", "sources": ["https://www.cdc.gov/niosh/npg/npgd0350.html"], "stale_after": "2027-09-08", "substance": "Isobutane", "title": "Isobutane \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Isobutyl acetate; 2-methylpropyl acetate\n\n**CAS No.:** 110190\n\n**PEL (ppm):** 150\n\n**PEL (mg/m\u00b3):** 700\n\n> 110190 | | Isobutyl acetate; 2-methylpropyl acetate | 150 | 700\n\nSource: \n", "cas_number": "110190", "file": "isobutyl-acetate-2-methylpropyl-acetate.md", "generated": true, "harvested": "2026-08-05", "id": "isobutyl-acetate-2-methylpropyl-acetate", "pel_mgm3": "700", "pel_ppm": "150", "source_quote": "110190 | | Isobutyl acetate; 2-methylpropyl acetate | 150 | 700", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Isobutyl acetate; 2-methylpropyl acetate", "title": "Isobutyl acetate; 2-methylpropyl acetate \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Isobutyl acetate\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Isobutyl acetate\n\n**CAS No.:** 110-19-0\n\n> CAS No. 110-19-0\n\n**NIOSH REL (ppm):** TWA 150\n\n**NIOSH REL (mg/m\u00b3):** 700\n\n> NIOSH REL TWA 150 ppm (700 mg/m3)\n\nSource: \n", "cas_number": "110-19-0", "file": "isobutyl-acetate-2.md", "generated": true, "harvested": "2026-09-08", "id": "isobutyl-acetate-2", "quote_cas_number": "CAS No. 110-19-0", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Isobutyl acetate", "rel_mgm3": "700", "rel_ppm": "TWA 150", "source_quote": "NIOSH REL TWA 150 ppm (700 mg/m3)", "sources": ["https://www.cdc.gov/niosh/npg/npgd0351.html"], "stale_after": "2027-09-08", "substance": "Isobutyl acetate", "title": "Isobutyl acetate \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Isobutyl acetate\n\n**CAS No.:** 110-19-0\n\n**PEL (ppm):** 150\n\n**PEL (mg/m\u00b3):** 700\n\n> Isobutyl acetate | 110-19-0 | 150 | 700 | - |\n\nSource: \n", "cas_number": "110-19-0", "file": "isobutyl-acetate.md", "generated": true, "harvested": "2026-08-05", "id": "isobutyl-acetate", "pel_mgm3": "700", "pel_ppm": "150", "source_quote": "Isobutyl acetate | 110-19-0 | 150 | 700 | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Isobutyl acetate", "title": "Isobutyl acetate \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Isobutyl alcohol; 2-methylpropanol\n\n**CAS No.:** 78831\n\n**PEL (ppm):** 50\n\n**PEL (mg/m\u00b3):** 150\n\n> 78831 | | Isobutyl alcohol; 2-methylpropanol | 50 | 150\n\nSource: \n", "cas_number": "78831", "file": "isobutyl-alcohol-2-methylpropanol.md", "generated": true, "harvested": "2026-08-05", "id": "isobutyl-alcohol-2-methylpropanol", "pel_mgm3": "150", "pel_ppm": "50", "source_quote": "78831 | | Isobutyl alcohol; 2-methylpropanol | 50 | 150", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Isobutyl alcohol; 2-methylpropanol", "title": "Isobutyl alcohol; 2-methylpropanol \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Isobutyl alcohol\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Isobutyl alcohol\n\n**CAS No.:** 78-83-1\n\n> CAS No. 78-83-1\n\n**NIOSH REL (ppm):** TWA 50\n\n**NIOSH REL (mg/m\u00b3):** 150\n\n> NIOSH REL TWA 50 ppm (150 mg/m3)\n\nSource: \n", "cas_number": "78-83-1", "file": "isobutyl-alcohol-2.md", "generated": true, "harvested": "2026-09-08", "id": "isobutyl-alcohol-2", "quote_cas_number": "CAS No. 78-83-1", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Isobutyl alcohol", "rel_mgm3": "150", "rel_ppm": "TWA 50", "source_quote": "NIOSH REL TWA 50 ppm (150 mg/m3)", "sources": ["https://www.cdc.gov/niosh/npg/npgd0352.html"], "stale_after": "2027-09-08", "substance": "Isobutyl alcohol", "title": "Isobutyl alcohol \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Isobutyl alcohol\n\n**CAS No.:** 78-83-1\n\n**PEL (ppm):** 100\n\n**PEL (mg/m\u00b3):** 300\n\n> Isobutyl alcohol | 78-83-1 | 100 | 300 | - |\n\nSource: \n", "cas_number": "78-83-1", "file": "isobutyl-alcohol.md", "generated": true, "harvested": "2026-08-05", "id": "isobutyl-alcohol", "pel_mgm3": "300", "pel_ppm": "100", "source_quote": "Isobutyl alcohol | 78-83-1 | 100 | 300 | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Isobutyl alcohol", "title": "Isobutyl alcohol \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Isobutyronitrile\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Isobutyronitrile\n\n**CAS No.:** 78-82-0\n\n> CAS No. 78-82-0\n\n**NIOSH REL (ppm):** TWA 8\n\n**NIOSH REL (mg/m\u00b3):** 22\n\n> NIOSH REL TWA 8 ppm (22 mg/m3)\n\nSource: \n", "cas_number": "78-82-0", "file": "isobutyronitrile.md", "generated": true, "harvested": "2026-09-08", "id": "isobutyronitrile", "quote_cas_number": "CAS No. 78-82-0", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Isobutyronitrile", "rel_mgm3": "22", "rel_ppm": "TWA 8", "source_quote": "NIOSH REL TWA 8 ppm (22 mg/m3)", "sources": ["https://www.cdc.gov/niosh/npg/npgd0353.html"], "stale_after": "2027-09-08", "substance": "Isobutyronitrile", "title": "Isobutyronitrile \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Isoflurane\n\n**CAS No.:** 26675467\n\n**PEL (ppm):** 2\n\n**PEL (mg/m\u00b3):** 15\n\n> 26675467 | | Isoflurane | 2 | 15\n\nSource: \n", "cas_number": "26675467", "file": "isoflurane.md", "generated": true, "harvested": "2026-08-05", "id": "isoflurane", "pel_mgm3": "15", "pel_ppm": "2", "source_quote": "26675467 | | Isoflurane | 2 | 15", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Isoflurane", "title": "Isoflurane \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Isooctyl alcohol\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Isooctyl alcohol\n\n**CAS No.:** 26952-21-6\n\n> CAS No. 26952-21-6\n\n**NIOSH REL (ppm):** TWA 50\n\n**NIOSH REL (mg/m\u00b3):** 270\n\n> NIOSH REL TWA 50 ppm (270 mg/m3) [skin]\n\nSource: \n", "cas_number": "26952-21-6", "file": "isooctyl-alcohol-2.md", "generated": true, "harvested": "2026-09-08", "id": "isooctyl-alcohol-2", "quote_cas_number": "CAS No. 26952-21-6", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Isooctyl alcohol", "rel_mgm3": "270", "rel_ppm": "TWA 50", "source_quote": "NIOSH REL TWA 50 ppm (270 mg/m3) [skin]", "sources": ["https://www.cdc.gov/niosh/npg/npgd0354.html"], "stale_after": "2027-09-08", "substance": "Isooctyl alcohol", "title": "Isooctyl alcohol \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Isooctyl alcohol\n\n**CAS No.:** 26952216\n\n**PEL (ppm):** 50\n\n**PEL (mg/m\u00b3):** 270\n\n> 26952216 | S | Isooctyl alcohol | 50 | 270\n\nSource: \n", "cas_number": "26952216", "file": "isooctyl-alcohol.md", "generated": true, "harvested": "2026-08-05", "id": "isooctyl-alcohol", "pel_mgm3": "270", "pel_ppm": "50", "source_quote": "26952216 | S | Isooctyl alcohol | 50 | 270", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Isooctyl alcohol", "title": "Isooctyl alcohol \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Isophorone\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Isophorone\n\n**CAS No.:** 78-59-1\n\n> CAS No. 78-59-1\n\n**NIOSH REL (ppm):** TWA 4\n\n**NIOSH REL (mg/m\u00b3):** 23\n\n> NIOSH REL TWA 4 ppm (23 mg/m3)\n\nSource: \n", "cas_number": "78-59-1", "file": "isophorone-2.md", "generated": true, "harvested": "2026-09-08", "id": "isophorone-2", "quote_cas_number": "CAS No. 78-59-1", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Isophorone", "rel_mgm3": "23", "rel_ppm": "TWA 4", "source_quote": "NIOSH REL TWA 4 ppm (23 mg/m3)", "sources": ["https://www.cdc.gov/niosh/npg/npgd0355.html"], "stale_after": "2027-09-08", "substance": "Isophorone", "title": "Isophorone \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Isophorone; 3,5,5-trimethyl-2-cyclohexene-1-one\n\n**CAS No.:** 78591\n\n**PEL (ppm):** 4\n\n**PEL (mg/m\u00b3):** 23\n\n> 78591 | | Isophorone; 3,5,5-trimethyl-2-cyclohexene-1-one | 4 | 23\n\nSource: \n", "cas_number": "78591", "file": "isophorone-3-5-5-trimethyl-2-cyclohexene-1-one.md", "generated": true, "harvested": "2026-08-05", "id": "isophorone-3-5-5-trimethyl-2-cyclohexene-1-one", "pel_mgm3": "23", "pel_ppm": "4", "source_quote": "78591 | | Isophorone; 3,5,5-trimethyl-2-cyclohexene-1-one | 4 | 23", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Isophorone; 3,5,5-trimethyl-2-cyclohexene-1-one", "title": "Isophorone; 3,5,5-trimethyl-2-cyclohexene-1-one \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Isophorone diisocyanate; IPDI\n\n**CAS No.:** 4098719\n\n**PEL (ppm):** 0.005\n\n**PEL (mg/m\u00b3):** 0.045\n\n**STEL (ppm):** 0.02\n\n> 4098719 | S | Isophorone diisocyanate; IPDI | 0.005 | 0.045 | | 0.02 | --\n\nSource: \n", "cas_number": "4098719", "file": "isophorone-diisocyanate-ipdi.md", "generated": true, "harvested": "2026-08-05", "id": "isophorone-diisocyanate-ipdi", "pel_mgm3": "0.045", "pel_ppm": "0.005", "source_quote": "4098719 | S | Isophorone diisocyanate; IPDI | 0.005 | 0.045 | | 0.02 | --", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "stel_ppm": "0.02", "substance": "Isophorone diisocyanate; IPDI", "title": "Isophorone diisocyanate; IPDI \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Isophorone diisocyanate\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Isophorone diisocyanate\n\n**CAS No.:** 4098-71-9\n\n> CAS No. 4098-71-9\n\n**NIOSH REL (ppm):** TWA 0.005\n\n**NIOSH REL (mg/m\u00b3):** 0.045\n\n> NIOSH REL TWA 0.005 ppm (0.045 mg/m3) ST 0.02 ppm (0.180 mg/m3) [skin]\n\nSource: \n", "cas_number": "4098-71-9", "file": "isophorone-diisocyanate.md", "generated": true, "harvested": "2026-09-08", "id": "isophorone-diisocyanate", "quote_cas_number": "CAS No. 4098-71-9", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Isophorone diisocyanate", "rel_mgm3": "0.045", "rel_ppm": "TWA 0.005", "source_quote": "NIOSH REL TWA 0.005 ppm (0.045 mg/m3) ST 0.02 ppm (0.180 mg/m3) [skin]", "sources": ["https://www.cdc.gov/niosh/npg/npgd0356.html"], "stale_after": "2027-09-08", "substance": "Isophorone diisocyanate", "title": "Isophorone diisocyanate \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Isophorone\n\n**CAS No.:** 78-59-1\n\n**PEL (ppm):** 25\n\n**PEL (mg/m\u00b3):** 140\n\n> Isophorone | 78-59-1 | 25 | 140 | - |\n\nSource: \n", "cas_number": "78-59-1", "file": "isophorone.md", "generated": true, "harvested": "2026-08-05", "id": "isophorone", "pel_mgm3": "140", "pel_ppm": "25", "source_quote": "Isophorone | 78-59-1 | 25 | 140 | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Isophorone", "title": "Isophorone \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Isopropoxyethanol\n\n**CAS No.:** 109591\n\n**PEL (ppm):** 25\n\n**PEL (mg/m\u00b3):** 105\n\n> 109591 | | Isopropoxyethanol | 25 | 105\n\nSource: \n", "cas_number": "109591", "file": "isopropoxyethanol.md", "generated": true, "harvested": "2026-08-05", "id": "isopropoxyethanol", "pel_mgm3": "105", "pel_ppm": "25", "source_quote": "109591 | | Isopropoxyethanol | 25 | 105", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Isopropoxyethanol", "title": "Isopropoxyethanol \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Isopropyl acetate\n\n**CAS No.:** 108214\n\n**PEL (ppm):** 250\n\n**PEL (mg/m\u00b3):** 950\n\n**STEL (ppm):** 310\n\n**STEL (mg/m\u00b3):** 1185\n\n> 108214 | | Isopropyl acetate | 250 | 950 | | 310 | 1185\n\nSource: \n", "cas_number": "108214", "file": "isopropyl-acetate-2.md", "generated": true, "harvested": "2026-08-05", "id": "isopropyl-acetate-2", "pel_mgm3": "950", "pel_ppm": "250", "source_quote": "108214 | | Isopropyl acetate | 250 | 950 | | 310 | 1185", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "stel_mgm3": "1185", "stel_ppm": "310", "substance": "Isopropyl acetate", "title": "Isopropyl acetate \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Isopropyl acetate\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Isopropyl acetate\n\n**CAS No.:** 108-21-4\n\n> CAS No. 108-21-4\n\n**NIOSH REL, as stated:** See Appendix D\n\n> NIOSH REL See Appendix D\n\nSource: \n", "cas_number": "108-21-4", "file": "isopropyl-acetate-3.md", "generated": true, "harvested": "2026-09-08", "id": "isopropyl-acetate-3", "quote_cas_number": "CAS No. 108-21-4", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Isopropyl acetate", "rel_statement": "See Appendix D", "source_quote": "NIOSH REL See Appendix D", "sources": ["https://www.cdc.gov/niosh/npg/npgd0358.html"], "stale_after": "2027-09-08", "substance": "Isopropyl acetate", "title": "Isopropyl acetate \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Isopropyl acetate\n\n**CAS No.:** 108-21-4\n\n**PEL (ppm):** 250\n\n**PEL (mg/m\u00b3):** 950\n\n> Isopropyl acetate | 108-21-4 | 250 | 950 | - |\n\nSource: \n", "cas_number": "108-21-4", "file": "isopropyl-acetate.md", "generated": true, "harvested": "2026-08-05", "id": "isopropyl-acetate", "pel_mgm3": "950", "pel_ppm": "250", "source_quote": "Isopropyl acetate | 108-21-4 | 250 | 950 | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Isopropyl acetate", "title": "Isopropyl acetate \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Isopropyl alcohol\n\n**CAS No.:** 67630\n\n**PEL (ppm):** 400\n\n**PEL (mg/m\u00b3):** 980\n\n**STEL (ppm):** 500\n\n**STEL (mg/m\u00b3):** 1225\n\n> 67630 | | Isopropyl alcohol | 400 | 980 | | 500 | 1225\n\nSource: \n", "cas_number": "67630", "file": "isopropyl-alcohol-2.md", "generated": true, "harvested": "2026-08-05", "id": "isopropyl-alcohol-2", "pel_mgm3": "980", "pel_ppm": "400", "source_quote": "67630 | | Isopropyl alcohol | 400 | 980 | | 500 | 1225", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "stel_mgm3": "1225", "stel_ppm": "500", "substance": "Isopropyl alcohol", "title": "Isopropyl alcohol \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Isopropyl alcohol\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Isopropyl alcohol\n\n**CAS No.:** 67-63-0\n\n> CAS No. 67-63-0\n\n**NIOSH REL (ppm):** TWA 400\n\n**NIOSH REL (mg/m\u00b3):** 980\n\n> NIOSH REL TWA 400 ppm (980 mg/m3) ST 500 ppm (1225 mg/m3)\n\nSource: \n", "cas_number": "67-63-0", "file": "isopropyl-alcohol-3.md", "generated": true, "harvested": "2026-09-08", "id": "isopropyl-alcohol-3", "quote_cas_number": "CAS No. 67-63-0", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Isopropyl alcohol", "rel_mgm3": "980", "rel_ppm": "TWA 400", "source_quote": "NIOSH REL TWA 400 ppm (980 mg/m3) ST 500 ppm (1225 mg/m3)", "sources": ["https://www.cdc.gov/niosh/npg/npgd0359.html"], "stale_after": "2027-09-08", "substance": "Isopropyl alcohol", "title": "Isopropyl alcohol \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Isopropyl alcohol\n\n**CAS No.:** 67-63-0\n\n**PEL (ppm):** 400\n\n**PEL (mg/m\u00b3):** 980\n\n> Isopropyl alcohol | 67-63-0 | 400 | 980 | - |\n\nSource: \n", "cas_number": "67-63-0", "file": "isopropyl-alcohol.md", "generated": true, "harvested": "2026-08-05", "id": "isopropyl-alcohol", "pel_mgm3": "980", "pel_ppm": "400", "source_quote": "Isopropyl alcohol | 67-63-0 | 400 | 980 | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Isopropyl alcohol", "title": "Isopropyl alcohol \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Isopropyl ether\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Isopropyl ether\n\n**CAS No.:** 108-20-3\n\n> CAS No. 108-20-3\n\n**NIOSH REL (ppm):** TWA 500\n\n**NIOSH REL (mg/m\u00b3):** 2100\n\n> NIOSH REL TWA 500 ppm (2100 mg/m3)\n\nSource: \n", "cas_number": "108-20-3", "file": "isopropyl-ether-2.md", "generated": true, "harvested": "2026-09-08", "id": "isopropyl-ether-2", "quote_cas_number": "CAS No. 108-20-3", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Isopropyl ether", "rel_mgm3": "2100", "rel_ppm": "TWA 500", "source_quote": "NIOSH REL TWA 500 ppm (2100 mg/m3)", "sources": ["https://www.cdc.gov/niosh/npg/npgd0362.html"], "stale_after": "2027-09-08", "substance": "Isopropyl ether", "title": "Isopropyl ether \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Isopropyl ether; diisopropyl ether\n\n**CAS No.:** 108203\n\n**PEL (ppm):** 250\n\n**PEL (mg/m\u00b3):** 1,050\n\n> 108203 | | Isopropyl ether; diisopropyl ether | 250 | 1,050\n\nSource: \n", "cas_number": "108203", "file": "isopropyl-ether-diisopropyl-ether.md", "generated": true, "harvested": "2026-08-05", "id": "isopropyl-ether-diisopropyl-ether", "pel_mgm3": "1,050", "pel_ppm": "250", "source_quote": "108203 | | Isopropyl ether; diisopropyl ether | 250 | 1,050", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Isopropyl ether; diisopropyl ether", "title": "Isopropyl ether; diisopropyl ether \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Isopropyl ether\n\n**CAS No.:** 108-20-3\n\n**PEL (ppm):** 500\n\n**PEL (mg/m\u00b3):** 2100\n\n> Isopropyl ether | 108-20-3 | 500 | 2100 | - |\n\nSource: \n", "cas_number": "108-20-3", "file": "isopropyl-ether.md", "generated": true, "harvested": "2026-08-05", "id": "isopropyl-ether", "pel_mgm3": "2100", "pel_ppm": "500", "source_quote": "Isopropyl ether | 108-20-3 | 500 | 2100 | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Isopropyl ether", "title": "Isopropyl ether \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Isopropyl glycidyl ether; IGE; 1,2-epoxy-3-isopropoxypropane\n\n**CAS No.:** 4016142\n\n**PEL (ppm):** 50\n\n**PEL (mg/m\u00b3):** 240\n\n**STEL (ppm):** 75\n\n**STEL (mg/m\u00b3):** 360\n\n> 4016142 | | Isopropyl glycidyl ether; IGE; 1,2-epoxy-3-isopropoxypropane | 50 | 240 | | 75 | 360\n\nSource: \n", "cas_number": "4016142", "file": "isopropyl-glycidyl-ether-ige-1-2-epoxy-3-isopropoxypropane.md", "generated": true, "harvested": "2026-08-05", "id": "isopropyl-glycidyl-ether-ige-1-2-epoxy-3-isopropoxypropane", "pel_mgm3": "240", "pel_ppm": "50", "source_quote": "4016142 | | Isopropyl glycidyl ether; IGE; 1,2-epoxy-3-isopropoxypropane | 50 | 240 | | 75 | 360", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "stel_mgm3": "360", "stel_ppm": "75", "substance": "Isopropyl glycidyl ether; IGE; 1,2-epoxy-3-isopropoxypropane", "title": "Isopropyl glycidyl ether; IGE; 1,2-epoxy-3-isopropoxypropane \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Isopropyl glycidyl ether (IGE)\n\n**CAS No.:** 4016-14-2\n\n**PEL (ppm):** 50\n\n**PEL (mg/m\u00b3):** 240\n\n> Isopropyl glycidyl ether (IGE) | 4016-14-2 | 50 | 240 | - |\n\nSource: \n", "cas_number": "4016-14-2", "file": "isopropyl-glycidyl-ether-ige.md", "generated": true, "harvested": "2026-08-05", "id": "isopropyl-glycidyl-ether-ige", "pel_mgm3": "240", "pel_ppm": "50", "source_quote": "Isopropyl glycidyl ether (IGE) | 4016-14-2 | 50 | 240 | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Isopropyl glycidyl ether (IGE)", "title": "Isopropyl glycidyl ether (IGE) \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Isopropyl glycidyl ether\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Isopropyl glycidyl ether\n\n**CAS No.:** 4016-14-2\n\n> CAS No. 4016-14-2\n\n**NIOSH REL (ppm):** C 50\n\n**NIOSH REL (mg/m\u00b3):** 240\n\n> NIOSH REL C 50 ppm (240 mg/m3) [15-minute]\n\nSource: \n", "cas_number": "4016-14-2", "file": "isopropyl-glycidyl-ether.md", "generated": true, "harvested": "2026-09-08", "id": "isopropyl-glycidyl-ether", "quote_cas_number": "CAS No. 4016-14-2", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Isopropyl glycidyl ether", "rel_mgm3": "240", "rel_ppm": "C 50", "source_quote": "NIOSH REL C 50 ppm (240 mg/m3) [15-minute]", "sources": ["https://www.cdc.gov/niosh/npg/npgd0363.html"], "stale_after": "2027-09-08", "substance": "Isopropyl glycidyl ether", "title": "Isopropyl glycidyl ether \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Isopropylamine\n\n**CAS No.:** 75310\n\n**PEL (ppm):** 5\n\n**PEL (mg/m\u00b3):** 12\n\n**STEL (ppm):** 10\n\n**STEL (mg/m\u00b3):** 24\n\n> 75310 | | Isopropylamine | 5 | 12 | | 10 | 24\n\nSource: \n", "cas_number": "75310", "file": "isopropylamine-2.md", "generated": true, "harvested": "2026-08-05", "id": "isopropylamine-2", "pel_mgm3": "12", "pel_ppm": "5", "source_quote": "75310 | | Isopropylamine | 5 | 12 | | 10 | 24", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "stel_mgm3": "24", "stel_ppm": "10", "substance": "Isopropylamine", "title": "Isopropylamine \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Isopropylamine\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Isopropylamine\n\n**CAS No.:** 75-31-0\n\n> CAS No. 75-31-0\n\n**NIOSH REL, as stated:** See Appendix D\n\n> NIOSH REL See Appendix D\n\nSource: \n", "cas_number": "75-31-0", "file": "isopropylamine-3.md", "generated": true, "harvested": "2026-09-08", "id": "isopropylamine-3", "quote_cas_number": "CAS No. 75-31-0", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Isopropylamine", "rel_statement": "See Appendix D", "source_quote": "NIOSH REL See Appendix D", "sources": ["https://www.cdc.gov/niosh/npg/npgd0360.html"], "stale_after": "2027-09-08", "substance": "Isopropylamine", "title": "Isopropylamine \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Isopropylamine\n\n**CAS No.:** 75-31-0\n\n**PEL (ppm):** 5\n\n**PEL (mg/m\u00b3):** 12\n\n> Isopropylamine | 75-31-0 | 5 | 12 | - |\n\nSource: \n", "cas_number": "75-31-0", "file": "isopropylamine.md", "generated": true, "harvested": "2026-08-05", "id": "isopropylamine", "pel_mgm3": "12", "pel_ppm": "5", "source_quote": "Isopropylamine | 75-31-0 | 5 | 12 | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Isopropylamine", "title": "Isopropylamine \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Kaolin\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Kaolin\n\n**CAS No.:** 1332-58-7\n\n> CAS No. 1332-58-7\n\n**NIOSH REL, as stated:** TWA 10 mg/m3 (total) TWA 5 mg/m3 (resp)\n\n> NIOSH REL TWA 10 mg/m3 (total) TWA 5 mg/m3 (resp)\n\nSource: \n", "cas_number": "1332-58-7", "file": "kaolin-2.md", "generated": true, "harvested": "2026-09-08", "id": "kaolin-2", "quote_cas_number": "CAS No. 1332-58-7", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Kaolin", "rel_statement": "TWA 10 mg/m3 (total) TWA 5 mg/m3 (resp)", "source_quote": "NIOSH REL TWA 10 mg/m3 (total) TWA 5 mg/m3 (resp)", "sources": ["https://www.cdc.gov/niosh/npg/npgd0364.html"], "stale_after": "2027-09-08", "substance": "Kaolin", "title": "Kaolin \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Kaolin; (respirable dust containing no asbestos and <1% crystaline silica)\n\n**CAS No.:** 1332587\n\n**PEL (mg/m\u00b3):** 2\n\n> 1332587 | | Kaolin; (respirable dust containing no asbestos and <1% crystaline silica) | -- | 2\n\nSource: \n", "cas_number": "1332587", "file": "kaolin-respirable-dust-containing-no-asbestos-and-1-crystaline-silica.md", "generated": true, "harvested": "2026-08-05", "id": "kaolin-respirable-dust-containing-no-asbestos-and-1-crystaline-silica", "pel_mgm3": "2", "source_quote": "1332587 | | Kaolin; (respirable dust containing no asbestos and <1% crystaline silica) | -- | 2", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Kaolin; (respirable dust containing no asbestos and <1% crystaline silica)", "title": "Kaolin; (respirable dust containing no asbestos and <1% crystaline silica) \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Kaolin\n\n**CAS No.:** 1332-58-7\n\n> Kaolin | 1332-58-7 | - | - | - |\n\nSource: \n", "cas_number": "1332-58-7", "file": "kaolin.md", "generated": true, "harvested": "2026-08-05", "id": "kaolin", "source_quote": "Kaolin | 1332-58-7 | - | - | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Kaolin", "title": "Kaolin \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Kepone\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Kepone\n\n**CAS No.:** 143-50-0\n\n> CAS No. 143-50-0\n\n**NIOSH REL (mg/m\u00b3):** TWA 0.001\n\n> NIOSH REL Ca TWA 0.001 mg/m3\n\nSource: \n", "cas_number": "143-50-0", "file": "kepone.md", "generated": true, "harvested": "2026-09-08", "id": "kepone", "quote_cas_number": "CAS No. 143-50-0", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Kepone", "rel_mgm3": "TWA 0.001", "source_quote": "NIOSH REL Ca TWA 0.001 mg/m3", "sources": ["https://www.cdc.gov/niosh/npg/npgd0365.html"], "stale_after": "2027-09-08", "substance": "Kepone", "title": "Kepone \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Kerosene\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Kerosene\n\n**CAS No.:** 8008-20-6\n\n> CAS No. 8008-20-6\n\n**NIOSH REL (mg/m\u00b3):** TWA 100\n\n> NIOSH REL TWA 100 mg/m3\n\nSource: \n", "cas_number": "8008-20-6", "file": "kerosene.md", "generated": true, "harvested": "2026-09-08", "id": "kerosene", "quote_cas_number": "CAS No. 8008-20-6", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Kerosene", "rel_mgm3": "TWA 100", "source_quote": "NIOSH REL TWA 100 mg/m3", "sources": ["https://www.cdc.gov/niosh/npg/npgd0366.html"], "stale_after": "2027-09-08", "substance": "Kerosene", "title": "Kerosene \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Ketene\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Ketene\n\n**CAS No.:** 463-51-4\n\n> CAS No. 463-51-4\n\n**NIOSH REL (ppm):** TWA 0.5\n\n**NIOSH REL (mg/m\u00b3):** 0.9\n\n> NIOSH REL TWA 0.5 ppm (0.9 mg/m3) ST 1.5 ppm (3 mg/m3)\n\nSource: \n", "cas_number": "463-51-4", "file": "ketene-2.md", "generated": true, "harvested": "2026-09-08", "id": "ketene-2", "quote_cas_number": "CAS No. 463-51-4", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Ketene", "rel_mgm3": "0.9", "rel_ppm": "TWA 0.5", "source_quote": "NIOSH REL TWA 0.5 ppm (0.9 mg/m3) ST 1.5 ppm (3 mg/m3)", "sources": ["https://www.cdc.gov/niosh/npg/npgd0367.html"], "stale_after": "2027-09-08", "substance": "Ketene", "title": "Ketene \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Ketene; ethenone\n\n**CAS No.:** 463514\n\n**PEL (ppm):** 0.5\n\n**PEL (mg/m\u00b3):** 0.9\n\n**STEL (ppm):** 1.5\n\n**STEL (mg/m\u00b3):** 3\n\n> 463514 | | Ketene; ethenone | 0.5 | 0.9 | | 1.5 | 3\n\nSource: \n", "cas_number": "463514", "file": "ketene-ethenone.md", "generated": true, "harvested": "2026-08-05", "id": "ketene-ethenone", "pel_mgm3": "0.9", "pel_ppm": "0.5", "source_quote": "463514 | | Ketene; ethenone | 0.5 | 0.9 | | 1.5 | 3", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "stel_mgm3": "3", "stel_ppm": "1.5", "substance": "Ketene; ethenone", "title": "Ketene; ethenone \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Ketene\n\n**CAS No.:** 463-51-4\n\n**PEL (ppm):** 0.5\n\n**PEL (mg/m\u00b3):** 0.9\n\n> Ketene | 463-51-4 | 0.5 | 0.9 | - |\n\nSource: \n", "cas_number": "463-51-4", "file": "ketene.md", "generated": true, "harvested": "2026-08-05", "id": "ketene", "pel_mgm3": "0.9", "pel_ppm": "0.5", "source_quote": "Ketene | 463-51-4 | 0.5 | 0.9 | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Ketene", "title": "Ketene \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** L.P.G. (Liquefied petroleum gas)\n\n**CAS No.:** 68476-85-7\n\n**PEL (ppm):** 1000\n\n**PEL (mg/m\u00b3):** 1800\n\n> L.P.G. (Liquefied petroleum gas) | 68476-85-7 | 1000 | 1800 | - |\n\nSource: \n", "cas_number": "68476-85-7", "file": "l-p-g-liquefied-petroleum-gas.md", "generated": true, "harvested": "2026-08-05", "id": "l-p-g-liquefied-petroleum-gas", "pel_mgm3": "1800", "pel_ppm": "1000", "source_quote": "L.P.G. (Liquefied petroleum gas) | 68476-85-7 | 1000 | 1800 | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "L.P.G. (Liquefied petroleum gas)", "title": "L.P.G. (Liquefied petroleum gas) \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** L.P.G.\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - L.P.G.\n\n**CAS No.:** 68476-85-7\n\n> CAS No. 68476-85-7\n\n**NIOSH REL (ppm):** TWA 1000\n\n**NIOSH REL (mg/m\u00b3):** 1800\n\n> NIOSH REL TWA 1000 ppm (1800 mg/m3)\n\nSource: \n", "cas_number": "68476-85-7", "file": "l-p-g.md", "generated": true, "harvested": "2026-09-08", "id": "l-p-g", "quote_cas_number": "CAS No. 68476-85-7", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - L.P.G.", "rel_mgm3": "1800", "rel_ppm": "TWA 1000", "source_quote": "NIOSH REL TWA 1000 ppm (1800 mg/m3)", "sources": ["https://www.cdc.gov/niosh/npg/npgd0679.html"], "stale_after": "2027-09-08", "substance": "L.P.G.", "title": "L.P.G. \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Lead chromate, as Pb\n\n**CAS No.:** 7758976\n\n**PEL (mg/m\u00b3):** 0.01\n\n> 7758976 | | Lead chromate, as Pb | -- | 0.01\n\nSource: \n", "cas_number": "7758976", "file": "lead-chromate-as-pb.md", "generated": true, "harvested": "2026-08-05", "id": "lead-chromate-as-pb", "pel_mgm3": "0.01", "source_quote": "7758976 | | Lead chromate, as Pb | -- | 0.01", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Lead chromate, as Pb", "title": "Lead chromate, as Pb \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Lead, inorganic (as Pb); see 1910.1025\n\n**CAS No.:** 7439-92-1\n\n> Lead, inorganic (as Pb); see 1910.1025 | 7439-92-1 | - | - | - |\n\nSource: \n", "cas_number": "7439-92-1", "file": "lead-inorganic-as-pb-see-1910-1025.md", "generated": true, "harvested": "2026-08-05", "id": "lead-inorganic-as-pb-see-1910-1025", "source_quote": "Lead, inorganic (as Pb); see 1910.1025 | 7439-92-1 | - | - | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Lead, inorganic (as Pb); see 1910.1025", "title": "Lead, inorganic (as Pb); see 1910.1025 \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Lead (metallic) and inorganic compounds, dust and fume, as Pb\n\n**CAS No.:** 7439921\n\n**PEL (mg/m\u00b3):** 0.01\n\n> 7439921 | | Lead (metallic) and inorganic compounds, dust and fume, as Pb | -- | 0.01\n\nSource: \n", "cas_number": "7439921", "file": "lead-metallic-and-inorganic-compounds-dust-and-fume-as-pb.md", "generated": true, "harvested": "2026-08-05", "id": "lead-metallic-and-inorganic-compounds-dust-and-fume-as-pb", "pel_mgm3": "0.01", "source_quote": "7439921 | | Lead (metallic) and inorganic compounds, dust and fume, as Pb | -- | 0.01", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Lead (metallic) and inorganic compounds, dust and fume, as Pb", "title": "Lead (metallic) and inorganic compounds, dust and fume, as Pb \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Lead tetraethyl, see Tetraethyl lead\n\n**CAS No.:** 78002\n\n> 78002 | | Lead tetraethyl, see Tetraethyl lead\n\nSource: \n", "cas_number": "78002", "file": "lead-tetraethyl-see-tetraethyl-lead.md", "generated": true, "harvested": "2026-08-05", "id": "lead-tetraethyl-see-tetraethyl-lead", "source_quote": "78002 | | Lead tetraethyl, see Tetraethyl lead", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Lead tetraethyl, see Tetraethyl lead", "title": "Lead tetraethyl, see Tetraethyl lead \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Lead tetramethyl, see Tetramethyl lead\n\n**CAS No.:** 75741\n\n> 75741 | | Lead tetramethyl, see Tetramethyl lead\n\nSource: \n", "cas_number": "75741", "file": "lead-tetramethyl-see-tetramethyl-lead.md", "generated": true, "harvested": "2026-08-05", "id": "lead-tetramethyl-see-tetramethyl-lead", "source_quote": "75741 | | Lead tetramethyl, see Tetramethyl lead", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Lead tetramethyl, see Tetramethyl lead", "title": "Lead tetramethyl, see Tetramethyl lead \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Lead\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Lead\n\n**CAS No.:** 7439-92-1\n\n> CAS No. 7439-92-1\n\n**NIOSH REL, as stated:** TWA (8-hour) 0.050 mg/m3 See Appendix C\n\n> NIOSH REL TWA (8-hour) 0.050 mg/m3 See Appendix C\n\nSource: \n", "cas_number": "7439-92-1", "file": "lead.md", "generated": true, "harvested": "2026-09-08", "id": "lead", "quote_cas_number": "CAS No. 7439-92-1", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Lead", "rel_statement": "TWA (8-hour) 0.050 mg/m3 See Appendix C", "source_quote": "NIOSH REL TWA (8-hour) 0.050 mg/m3 See Appendix C", "sources": ["https://www.cdc.gov/niosh/npg/npgd0368.html"], "stale_after": "2027-09-08", "substance": "Lead", "title": "Lead \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Limestone\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Limestone\n\n**CAS No.:** 1317-65-3\n\n> CAS No. 1317-65-3\n\n**NIOSH REL, as stated:** TWA 10 mg/m3 (total) TWA 5 mg/m3 (resp)\n\n> NIOSH REL TWA 10 mg/m3 (total) TWA 5 mg/m3 (resp)\n\nSource: \n", "cas_number": "1317-65-3", "file": "limestone-2.md", "generated": true, "harvested": "2026-09-08", "id": "limestone-2", "quote_cas_number": "CAS No. 1317-65-3", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Limestone", "rel_statement": "TWA 10 mg/m3 (total) TWA 5 mg/m3 (resp)", "source_quote": "NIOSH REL TWA 10 mg/m3 (total) TWA 5 mg/m3 (resp)", "sources": ["https://www.cdc.gov/niosh/npg/npgd0369.html"], "stale_after": "2027-09-08", "substance": "Limestone", "title": "Limestone \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Limestone; calcium carbonate; see Particulates not otherwise regulated\n\n**CAS No.:** 1317653\n\n> 1317653 | | Limestone; calcium carbonate; see Particulates not otherwise regulated\n\nSource: \n", "cas_number": "1317653", "file": "limestone-calcium-carbonate-see-particulates-not-otherwise-regulated.md", "generated": true, "harvested": "2026-08-05", "id": "limestone-calcium-carbonate-see-particulates-not-otherwise-regulated", "source_quote": "1317653 | | Limestone; calcium carbonate; see Particulates not otherwise regulated", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Limestone; calcium carbonate; see Particulates not otherwise regulated", "title": "Limestone; calcium carbonate; see Particulates not otherwise regulated \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Limestone\n\n**CAS No.:** 1317-65-3\n\n> Limestone | 1317-65-3 | - | - | - |\n\nSource: \n", "cas_number": "1317-65-3", "file": "limestone.md", "generated": true, "harvested": "2026-08-05", "id": "limestone", "source_quote": "Limestone | 1317-65-3 | - | - | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Limestone", "title": "Limestone \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Lindane; 1,2,3,4,5,6-hexachlorocyclohexane, gamma isomer\n\n**CAS No.:** 58899\n\n**PEL (mg/m\u00b3):** 0.5\n\n> 58899 | S | Lindane; 1,2,3,4,5,6-hexachlorocyclohexane, gamma isomer | -- | 0.5\n\nSource: \n", "cas_number": "58899", "file": "lindane-1-2-3-4-5-6-hexachlorocyclohexane-gamma-isomer.md", "generated": true, "harvested": "2026-08-05", "id": "lindane-1-2-3-4-5-6-hexachlorocyclohexane-gamma-isomer", "pel_mgm3": "0.5", "source_quote": "58899 | S | Lindane; 1,2,3,4,5,6-hexachlorocyclohexane, gamma isomer | -- | 0.5", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Lindane; 1,2,3,4,5,6-hexachlorocyclohexane, gamma isomer", "title": "Lindane; 1,2,3,4,5,6-hexachlorocyclohexane, gamma isomer \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Lindane\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Lindane\n\n**CAS No.:** 58-89-9\n\n> CAS No. 58-89-9\n\n**NIOSH REL (mg/m\u00b3):** TWA 0.5\n\n> NIOSH REL TWA 0.5 mg/m3 [skin]\n\nSource: \n", "cas_number": "58-89-9", "file": "lindane-2.md", "generated": true, "harvested": "2026-09-08", "id": "lindane-2", "quote_cas_number": "CAS No. 58-89-9", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Lindane", "rel_mgm3": "TWA 0.5", "source_quote": "NIOSH REL TWA 0.5 mg/m3 [skin]", "sources": ["https://www.cdc.gov/niosh/npg/npgd0370.html"], "stale_after": "2027-09-08", "substance": "Lindane", "title": "Lindane \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Lindane\n\n**CAS No.:** 58-89-9\n\n**PEL (mg/m\u00b3):** 0.5\n\n> Lindane | 58-89-9 | - | 0.5 | X |\n\nSource: \n", "cas_number": "58-89-9", "file": "lindane.md", "generated": true, "harvested": "2026-08-05", "id": "lindane", "pel_mgm3": "0.5", "source_quote": "Lindane | 58-89-9 | - | 0.5 | X |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Lindane", "title": "Lindane \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Lithium hydride\n\n**CAS No.:** 7580678\n\n**PEL (mg/m\u00b3):** 0.025\n\n> 7580678 | | Lithium hydride | -- | 0.025\n\nSource: \n", "cas_number": "7580678", "file": "lithium-hydride-2.md", "generated": true, "harvested": "2026-08-05", "id": "lithium-hydride-2", "pel_mgm3": "0.025", "source_quote": "7580678 | | Lithium hydride | -- | 0.025", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Lithium hydride", "title": "Lithium hydride \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Lithium hydride\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Lithium hydride\n\n**CAS No.:** 7580-67-8\n\n> CAS No. 7580-67-8\n\n**NIOSH REL (mg/m\u00b3):** TWA 0.025\n\n> NIOSH REL TWA 0.025 mg/m3\n\nSource: \n", "cas_number": "7580-67-8", "file": "lithium-hydride-3.md", "generated": true, "harvested": "2026-09-08", "id": "lithium-hydride-3", "quote_cas_number": "CAS No. 7580-67-8", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Lithium hydride", "rel_mgm3": "TWA 0.025", "source_quote": "NIOSH REL TWA 0.025 mg/m3", "sources": ["https://www.cdc.gov/niosh/npg/npgd0371.html"], "stale_after": "2027-09-08", "substance": "Lithium hydride", "title": "Lithium hydride \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Lithium hydride\n\n**CAS No.:** 7580-67-8\n\n**PEL (mg/m\u00b3):** 0.025\n\n> Lithium hydride | 7580-67-8 | - | 0.025 | - |\n\nSource: \n", "cas_number": "7580-67-8", "file": "lithium-hydride.md", "generated": true, "harvested": "2026-08-05", "id": "lithium-hydride", "pel_mgm3": "0.025", "source_quote": "Lithium hydride | 7580-67-8 | - | 0.025 | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Lithium hydride", "title": "Lithium hydride \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Lithium stearate\n\n**CAS No.:** 4485125\n\n**PEL (mg/m\u00b3):** 10\n\n> 4485125 | | Lithium stearate | -- | 10\n\nSource: \n", "cas_number": "4485125", "file": "lithium-stearate.md", "generated": true, "harvested": "2026-08-05", "id": "lithium-stearate", "pel_mgm3": "10", "source_quote": "4485125 | | Lithium stearate | -- | 10", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Lithium stearate", "title": "Lithium stearate \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** m-Cresol\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - m-Cresol\n\n**CAS No.:** 108-39-4\n\n> CAS No. 108-39-4\n\n**NIOSH REL (ppm):** TWA 2.3\n\n**NIOSH REL (mg/m\u00b3):** 10\n\n> NIOSH REL TWA 2.3 ppm (10 mg/m3)\n\nSource: \n", "cas_number": "108-39-4", "file": "m-cresol.md", "generated": true, "harvested": "2026-09-08", "id": "m-cresol", "quote_cas_number": "CAS No. 108-39-4", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - m-Cresol", "rel_mgm3": "10", "rel_ppm": "TWA 2.3", "source_quote": "NIOSH REL TWA 2.3 ppm (10 mg/m3)", "sources": ["https://www.cdc.gov/niosh/npg/npgd0155.html"], "stale_after": "2027-09-08", "substance": "m-Cresol", "title": "m-Cresol \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** m-Dinitrobenzene\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - m-Dinitrobenzene\n\n**CAS No.:** 99-65-0\n\n> CAS No. 99-65-0\n\n**NIOSH REL (mg/m\u00b3):** TWA 1\n\n> NIOSH REL TWA 1 mg/m3 [skin]\n\nSource: \n", "cas_number": "99-65-0", "file": "m-dinitrobenzene.md", "generated": true, "harvested": "2026-09-08", "id": "m-dinitrobenzene", "quote_cas_number": "CAS No. 99-65-0", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - m-Dinitrobenzene", "rel_mgm3": "TWA 1", "source_quote": "NIOSH REL TWA 1 mg/m3 [skin]", "sources": ["https://www.cdc.gov/niosh/npg/npgd0232.html"], "stale_after": "2027-09-08", "substance": "m-Dinitrobenzene", "title": "m-Dinitrobenzene \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** m-isomer\n\n**CAS No.:** 99-08-1\n\n> m-isomer | 99-08-1 | - | - | - |\n\nSource: \n", "cas_number": "99-08-1", "file": "m-isomer.md", "generated": true, "harvested": "2026-08-05", "id": "m-isomer", "source_quote": "m-isomer | 99-08-1 | - | - | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "m-isomer", "title": "m-isomer \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** m-Nitrotoluene\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - m-Nitrotoluene\n\n**CAS No.:** 99-08-1\n\n> CAS No. 99-08-1\n\n**NIOSH REL (ppm):** TWA 2\n\n**NIOSH REL (mg/m\u00b3):** 11\n\n> NIOSH REL TWA 2 ppm (11 mg/m3) [skin]\n\nSource: \n", "cas_number": "99-08-1", "file": "m-nitrotoluene.md", "generated": true, "harvested": "2026-09-08", "id": "m-nitrotoluene", "quote_cas_number": "CAS No. 99-08-1", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - m-Nitrotoluene", "rel_mgm3": "11", "rel_ppm": "TWA 2", "source_quote": "NIOSH REL TWA 2 ppm (11 mg/m3) [skin]", "sources": ["https://www.cdc.gov/niosh/npg/npgd0463.html"], "stale_after": "2027-09-08", "substance": "m-Nitrotoluene", "title": "m-Nitrotoluene \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** m-Phthalodinitrile\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - m-Phthalodinitrile\n\n**CAS No.:** 626-17-5\n\n> CAS No. 626-17-5\n\n**NIOSH REL (mg/m\u00b3):** TWA 5\n\n> NIOSH REL TWA 5 mg/m3\n\nSource: \n", "cas_number": "626-17-5", "file": "m-phthalodinitrile-2.md", "generated": true, "harvested": "2026-09-08", "id": "m-phthalodinitrile-2", "quote_cas_number": "CAS No. 626-17-5", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - m-Phthalodinitrile", "rel_mgm3": "TWA 5", "source_quote": "NIOSH REL TWA 5 mg/m3", "sources": ["https://www.cdc.gov/niosh/npg/npgd0513.html"], "stale_after": "2027-09-08", "substance": "m-Phthalodinitrile", "title": "m-Phthalodinitrile \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** m-Phthalodinitrile\n\n**CAS No.:** 626175\n\n**PEL (mg/m\u00b3):** 5\n\n> 626175 | | m-Phthalodinitrile | -- | 5\n\nSource: \n", "cas_number": "626175", "file": "m-phthalodinitrile.md", "generated": true, "harvested": "2026-08-05", "id": "m-phthalodinitrile", "pel_mgm3": "5", "source_quote": "626175 | | m-Phthalodinitrile | -- | 5", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "m-Phthalodinitrile", "title": "m-Phthalodinitrile \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** m-Terphenyl\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - m-Terphenyl\n\n**CAS No.:** 92-06-8\n\n> CAS No. 92-06-8\n\n**NIOSH REL (ppm):** 0.5\n\n**NIOSH REL (mg/m\u00b3):** C 5\n\n> NIOSH REL C 5 mg/m3 (0.5 ppm)\n\nSource: \n", "cas_number": "92-06-8", "file": "m-terphenyl.md", "generated": true, "harvested": "2026-09-08", "id": "m-terphenyl", "quote_cas_number": "CAS No. 92-06-8", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - m-Terphenyl", "rel_mgm3": "C 5", "rel_ppm": "0.5", "source_quote": "NIOSH REL C 5 mg/m3 (0.5 ppm)", "sources": ["https://www.cdc.gov/niosh/npg/npgd0592.html"], "stale_after": "2027-09-08", "substance": "m-Terphenyl", "title": "m-Terphenyl \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** m-Toluidine\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - m-Toluidine\n\n**CAS No.:** 108-44-1\n\n> CAS No. 108-44-1\n\n**NIOSH REL, as stated:** See Appendix D\n\n> NIOSH REL See Appendix D\n\nSource: \n", "cas_number": "108-44-1", "file": "m-toluidine-2.md", "generated": true, "harvested": "2026-09-08", "id": "m-toluidine-2", "quote_cas_number": "CAS No. 108-44-1", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - m-Toluidine", "rel_statement": "See Appendix D", "source_quote": "NIOSH REL See Appendix D", "sources": ["https://www.cdc.gov/niosh/npg/npgd0623.html"], "stale_after": "2027-09-08", "substance": "m-Toluidine", "title": "m-Toluidine \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** m-Toluidine\n\n**CAS No.:** 108441\n\n**PEL (ppm):** 2\n\n**PEL (mg/m\u00b3):** 9\n\n> 108441 | S | m-Toluidine | 2 | 9\n\nSource: \n", "cas_number": "108441", "file": "m-toluidine.md", "generated": true, "harvested": "2026-08-05", "id": "m-toluidine", "pel_mgm3": "9", "pel_ppm": "2", "source_quote": "108441 | S | m-Toluidine | 2 | 9", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "m-Toluidine", "title": "m-Toluidine \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** m-Xylene-a,a\u2032-diamine\n\n**CAS No.:** 1477550\n\n**PEL (mg/m\u00b3):** 0.1\n\n**Ceiling:** C\n\n> 1477550 | S | m-Xylene-a,a\u2032-diamine | -- | 0.1 | C\n\nSource: \n", "cas_number": "1477550", "ceiling": "C", "file": "m-xylene-a-a-diamine.md", "generated": true, "harvested": "2026-08-05", "id": "m-xylene-a-a-diamine", "pel_mgm3": "0.1", "source_quote": "1477550 | S | m-Xylene-a,a\u2032-diamine | -- | 0.1 | C", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "m-Xylene-a,a\u2032-diamine", "title": "m-Xylene-a,a\u2032-diamine \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** m-Xylene-alpha,alpha'-diamine\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - m-Xylene-alpha,alpha'-diamine\n\n**CAS No.:** 1477-55-0\n\n> CAS No. 1477-55-0\n\n**NIOSH REL (mg/m\u00b3):** C 0.1\n\n> NIOSH REL C 0.1 mg/m3 [skin]\n\nSource: \n", "cas_number": "1477-55-0", "file": "m-xylene-alpha-alpha-diamine.md", "generated": true, "harvested": "2026-09-08", "id": "m-xylene-alpha-alpha-diamine", "quote_cas_number": "CAS No. 1477-55-0", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - m-Xylene-alpha,alpha'-diamine", "rel_mgm3": "C 0.1", "source_quote": "NIOSH REL C 0.1 mg/m3 [skin]", "sources": ["https://www.cdc.gov/niosh/npg/npgd0671.html"], "stale_after": "2027-09-08", "substance": "m-Xylene-alpha,alpha'-diamine", "title": "m-Xylene-alpha,alpha'-diamine \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** m-Xylene\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - m-Xylene\n\n**CAS No.:** 108-38-3\n\n> CAS No. 108-38-3\n\n**NIOSH REL (ppm):** TWA 100\n\n**NIOSH REL (mg/m\u00b3):** 435\n\n> NIOSH REL TWA 100 ppm (435 mg/m3) ST 150 ppm (655 mg/m3)\n\nSource: \n", "cas_number": "108-38-3", "file": "m-xylene.md", "generated": true, "harvested": "2026-09-08", "id": "m-xylene", "quote_cas_number": "CAS No. 108-38-3", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - m-Xylene", "rel_mgm3": "435", "rel_ppm": "TWA 100", "source_quote": "NIOSH REL TWA 100 ppm (435 mg/m3) ST 150 ppm (655 mg/m3)", "sources": ["https://www.cdc.gov/niosh/npg/npgd0669.html"], "stale_after": "2027-09-08", "substance": "m-Xylene", "title": "m-Xylene \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Magnesite\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Magnesite\n\n**CAS No.:** 546-93-0\n\n> CAS No. 546-93-0\n\n**NIOSH REL, as stated:** TWA 10 mg/m3 (total) TWA 5 mg/m3 (resp)\n\n> NIOSH REL TWA 10 mg/m3 (total) TWA 5 mg/m3 (resp)\n\nSource: \n", "cas_number": "546-93-0", "file": "magnesite-2.md", "generated": true, "harvested": "2026-09-08", "id": "magnesite-2", "quote_cas_number": "CAS No. 546-93-0", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Magnesite", "rel_statement": "TWA 10 mg/m3 (total) TWA 5 mg/m3 (resp)", "source_quote": "NIOSH REL TWA 10 mg/m3 (total) TWA 5 mg/m3 (resp)", "sources": ["https://www.cdc.gov/niosh/npg/npgd0373.html"], "stale_after": "2027-09-08", "substance": "Magnesite", "title": "Magnesite \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Magnesite; magnesium carbonate; see Particulates not otherwise regulated\n\n**CAS No.:** 13717005\n\n> 13717005 | | Magnesite; magnesium carbonate; see Particulates not otherwise regulated\n\nSource: \n", "cas_number": "13717005", "file": "magnesite-magnesium-carbonate-see-particulates-not-otherwise-regulated.md", "generated": true, "harvested": "2026-08-05", "id": "magnesite-magnesium-carbonate-see-particulates-not-otherwise-regulated", "source_quote": "13717005 | | Magnesite; magnesium carbonate; see Particulates not otherwise regulated", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Magnesite; magnesium carbonate; see Particulates not otherwise regulated", "title": "Magnesite; magnesium carbonate; see Particulates not otherwise regulated \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Magnesite\n\n**CAS No.:** 546-93-0\n\n> Magnesite | 546-93-0 | - | - | - |\n\nSource: \n", "cas_number": "546-93-0", "file": "magnesite.md", "generated": true, "harvested": "2026-08-05", "id": "magnesite", "source_quote": "Magnesite | 546-93-0 | - | - | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Magnesite", "title": "Magnesite \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Magnesium oxide fume\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Magnesium oxide fume\n\n**CAS No.:** 1309-48-4\n\n> CAS No. 1309-48-4\n\n**NIOSH REL, as stated:** See Appendix D\n\n> NIOSH REL See Appendix D\n\nSource: \n", "cas_number": "1309-48-4", "file": "magnesium-oxide-fume-2.md", "generated": true, "harvested": "2026-09-08", "id": "magnesium-oxide-fume-2", "quote_cas_number": "CAS No. 1309-48-4", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Magnesium oxide fume", "rel_statement": "See Appendix D", "source_quote": "NIOSH REL See Appendix D", "sources": ["https://www.cdc.gov/niosh/npg/npgd0374.html"], "stale_after": "2027-09-08", "substance": "Magnesium oxide fume", "title": "Magnesium oxide fume \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Magnesium oxide fume, as Mg\n\n**CAS No.:** 1309484\n\n**PEL (mg/m\u00b3):** 10\n\n> 1309484 | | Magnesium oxide fume, as Mg | -- | 10\n\nSource: \n", "cas_number": "1309484", "file": "magnesium-oxide-fume-as-mg.md", "generated": true, "harvested": "2026-08-05", "id": "magnesium-oxide-fume-as-mg", "pel_mgm3": "10", "source_quote": "1309484 | | Magnesium oxide fume, as Mg | -- | 10", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Magnesium oxide fume, as Mg", "title": "Magnesium oxide fume, as Mg \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Magnesium oxide fume\n\n**CAS No.:** 1309-48-4\n\n> Magnesium oxide fume | 1309-48-4 | - | - | - |\n\nSource: \n", "cas_number": "1309-48-4", "file": "magnesium-oxide-fume.md", "generated": true, "harvested": "2026-08-05", "id": "magnesium-oxide-fume", "source_quote": "Magnesium oxide fume | 1309-48-4 | - | - | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Magnesium oxide fume", "title": "Magnesium oxide fume \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Magnesium stearate\n\n**CAS No.:** 557040\n\n**PEL (mg/m\u00b3):** 10\n\n> 557040 | | Magnesium stearate | -- | 10\n\nSource: \n", "cas_number": "557040", "file": "magnesium-stearate.md", "generated": true, "harvested": "2026-08-05", "id": "magnesium-stearate", "pel_mgm3": "10", "source_quote": "557040 | | Magnesium stearate | -- | 10", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Magnesium stearate", "title": "Magnesium stearate \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Malathion\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Malathion\n\n**CAS No.:** 121-75-5\n\n> CAS No. 121-75-5\n\n**NIOSH REL (mg/m\u00b3):** TWA 10\n\n> NIOSH REL TWA 10 mg/m3 [skin]\n\nSource: \n", "cas_number": "121-75-5", "file": "malathion-2.md", "generated": true, "harvested": "2026-09-08", "id": "malathion-2", "quote_cas_number": "CAS No. 121-75-5", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Malathion", "rel_mgm3": "TWA 10", "source_quote": "NIOSH REL TWA 10 mg/m3 [skin]", "sources": ["https://www.cdc.gov/niosh/npg/npgd0375.html"], "stale_after": "2027-09-08", "substance": "Malathion", "title": "Malathion \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Malathion; o,o-dimethyl S-1(1,2-dicarboethyoxyethyl) phosphorodithioate\n\n**CAS No.:** 121755\n\n**PEL (mg/m\u00b3):** 10\n\n> 121755 | S | Malathion; o,o-dimethyl S-1(1,2-dicarboethyoxyethyl) phosphorodithioate | -- | 10\n\nSource: \n", "cas_number": "121755", "file": "malathion-o-o-dimethyl-s-1-1-2-dicarboethyoxyethyl-phosphorodithioate.md", "generated": true, "harvested": "2026-08-05", "id": "malathion-o-o-dimethyl-s-1-1-2-dicarboethyoxyethyl-phosphorodithioate", "pel_mgm3": "10", "source_quote": "121755 | S | Malathion; o,o-dimethyl S-1(1,2-dicarboethyoxyethyl) phosphorodithioate | -- | 10", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Malathion; o,o-dimethyl S-1(1,2-dicarboethyoxyethyl) phosphorodithioate", "title": "Malathion; o,o-dimethyl S-1(1,2-dicarboethyoxyethyl) phosphorodithioate \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Malathion\n\n**CAS No.:** 121-75-5\n\n> Malathion | 121-75-5 | - | - | - |\n\nSource: \n", "cas_number": "121-75-5", "file": "malathion.md", "generated": true, "harvested": "2026-08-05", "id": "malathion", "source_quote": "Malathion | 121-75-5 | - | - | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Malathion", "title": "Malathion \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Maleic anhydride\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Maleic anhydride\n\n**CAS No.:** 108-31-6\n\n> CAS No. 108-31-6\n\n**NIOSH REL (ppm):** 0.25\n\n**NIOSH REL (mg/m\u00b3):** TWA 1\n\n> NIOSH REL TWA 1 mg/m3 (0.25 ppm)\n\nSource: \n", "cas_number": "108-31-6", "file": "maleic-anhydride-2.md", "generated": true, "harvested": "2026-09-08", "id": "maleic-anhydride-2", "quote_cas_number": "CAS No. 108-31-6", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Maleic anhydride", "rel_mgm3": "TWA 1", "rel_ppm": "0.25", "source_quote": "NIOSH REL TWA 1 mg/m3 (0.25 ppm)", "sources": ["https://www.cdc.gov/niosh/npg/npgd0376.html"], "stale_after": "2027-09-08", "substance": "Maleic anhydride", "title": "Maleic anhydride \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Maleic anhydride; cis-butenedioic anhydride\n\n**CAS No.:** 108316\n\n**PEL (ppm):** 0.1\n\n**PEL (mg/m\u00b3):** 0.4\n\n> 108316 | | Maleic anhydride; cis-butenedioic anhydride | 0.1 | 0.4\n\nSource: \n", "cas_number": "108316", "file": "maleic-anhydride-cis-butenedioic-anhydride.md", "generated": true, "harvested": "2026-08-05", "id": "maleic-anhydride-cis-butenedioic-anhydride", "pel_mgm3": "0.4", "pel_ppm": "0.1", "source_quote": "108316 | | Maleic anhydride; cis-butenedioic anhydride | 0.1 | 0.4", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Maleic anhydride; cis-butenedioic anhydride", "title": "Maleic anhydride; cis-butenedioic anhydride \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Maleic anhydride\n\n**CAS No.:** 108-31-6\n\n**PEL (ppm):** 0.25\n\n**PEL (mg/m\u00b3):** 1\n\n> Maleic anhydride | 108-31-6 | 0.25 | 1 | - |\n\nSource: \n", "cas_number": "108-31-6", "file": "maleic-anhydride.md", "generated": true, "harvested": "2026-08-05", "id": "maleic-anhydride", "pel_mgm3": "1", "pel_ppm": "0.25", "source_quote": "Maleic anhydride | 108-31-6 | 0.25 | 1 | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Maleic anhydride", "title": "Maleic anhydride \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Malonaldehyde\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Malonaldehyde\n\n**CAS No.:** 542-78-9\n\n> CAS No. 542-78-9\n\n**NIOSH REL, as stated:** Ca See Appendix A See Appendix C (Aldehydes)\n\n> NIOSH REL Ca See Appendix A See Appendix C (Aldehydes)\n\nSource: \n", "cas_number": "542-78-9", "file": "malonaldehyde.md", "generated": true, "harvested": "2026-09-08", "id": "malonaldehyde", "quote_cas_number": "CAS No. 542-78-9", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Malonaldehyde", "rel_statement": "Ca See Appendix A See Appendix C (Aldehydes)", "source_quote": "NIOSH REL Ca See Appendix A See Appendix C (Aldehydes)", "sources": ["https://www.cdc.gov/niosh/npg/npgd0377.html"], "stale_after": "2027-09-08", "substance": "Malonaldehyde", "title": "Malonaldehyde \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Malononitrile\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Malononitrile\n\n**CAS No.:** 109-77-3\n\n> CAS No. 109-77-3\n\n**NIOSH REL (ppm):** TWA 3\n\n**NIOSH REL (mg/m\u00b3):** 8\n\n> NIOSH REL TWA 3 ppm (8 mg/m3)\n\nSource: \n", "cas_number": "109-77-3", "file": "malononitrile.md", "generated": true, "harvested": "2026-09-08", "id": "malononitrile", "quote_cas_number": "CAS No. 109-77-3", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Malononitrile", "rel_mgm3": "8", "rel_ppm": "TWA 3", "source_quote": "NIOSH REL TWA 3 ppm (8 mg/m3)", "sources": ["https://www.cdc.gov/niosh/npg/npgd0378.html"], "stale_after": "2027-09-08", "substance": "Malononitrile", "title": "Malononitrile \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Manganese compounds and fume (as Mn)\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Manganese compounds and fume (as Mn)\n\n**CAS No.:** 7439-96-5 (metal)\n\n> CAS No. 7439-96-5 (metal)\n\n**NIOSH REL (mg/m\u00b3):** TWA 1\n\n> NIOSH REL TWA 1 mg/m3 ST 3 mg/m3\n\nSource: \n", "cas_number": "7439-96-5 (metal)", "file": "manganese-compounds-and-fume-as-mn.md", "generated": true, "harvested": "2026-09-08", "id": "manganese-compounds-and-fume-as-mn", "quote_cas_number": "CAS No. 7439-96-5 (metal)", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Manganese compounds and fume (as Mn)", "rel_mgm3": "TWA 1", "source_quote": "NIOSH REL TWA 1 mg/m3 ST 3 mg/m3", "sources": ["https://www.cdc.gov/niosh/npg/npgd0379.html"], "stale_after": "2027-09-08", "substance": "Manganese compounds and fume (as Mn)", "title": "Manganese compounds and fume (as Mn) \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Manganese compounds (as Mn)\n\n**CAS No.:** 7439-96-5\n\n**PEL (mg/m\u00b3):** (C)5\n\n> Manganese compounds (as Mn) | 7439-96-5 | - | (C)5 | - |\n\nSource: \n", "cas_number": "7439-96-5", "file": "manganese-compounds-as-mn.md", "generated": true, "harvested": "2026-08-05", "id": "manganese-compounds-as-mn", "pel_mgm3": "(C)5", "source_quote": "Manganese compounds (as Mn) | 7439-96-5 | - | (C)5 | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Manganese compounds (as Mn)", "title": "Manganese compounds (as Mn) \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Manganese cyclopentadienyl tricarbonyl (as Mn)\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Manganese cyclopentadienyl tricarbonyl (as Mn)\n\n**CAS No.:** 12079-65-1\n\n> CAS No. 12079-65-1\n\n**NIOSH REL (mg/m\u00b3):** TWA 0.1\n\n> NIOSH REL TWA 0.1 mg/m3 [skin]\n\nSource: \n", "cas_number": "12079-65-1", "file": "manganese-cyclopentadienyl-tricarbonyl-as-mn-2.md", "generated": true, "harvested": "2026-09-08", "id": "manganese-cyclopentadienyl-tricarbonyl-as-mn-2", "quote_cas_number": "CAS No. 12079-65-1", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Manganese cyclopentadienyl tricarbonyl (as Mn)", "rel_mgm3": "TWA 0.1", "source_quote": "NIOSH REL TWA 0.1 mg/m3 [skin]", "sources": ["https://www.cdc.gov/niosh/npg/npgd0380.html"], "stale_after": "2027-09-08", "substance": "Manganese cyclopentadienyl tricarbonyl (as Mn)", "title": "Manganese cyclopentadienyl tricarbonyl (as Mn) \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Manganese, cyclopentadienyl-tricarbonyl, as Mn\n\n**CAS No.:** 12079651\n\n**PEL (mg/m\u00b3):** 0.1\n\n> 12079651 | S | Manganese, cyclopentadienyl-tricarbonyl, as Mn | -- | 0.1\n\nSource: \n", "cas_number": "12079651", "file": "manganese-cyclopentadienyl-tricarbonyl-as-mn.md", "generated": true, "harvested": "2026-08-05", "id": "manganese-cyclopentadienyl-tricarbonyl-as-mn", "pel_mgm3": "0.1", "source_quote": "12079651 | S | Manganese, cyclopentadienyl-tricarbonyl, as Mn | -- | 0.1", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Manganese, cyclopentadienyl-tricarbonyl, as Mn", "title": "Manganese, cyclopentadienyl-tricarbonyl, as Mn \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Manganese fume, as Mn\n\n**CAS No.:** 7439965\n\n**PEL (mg/m\u00b3):** 0.2\n\n**STEL (mg/m\u00b3):** 3\n\n> 7439965 | | Manganese fume, as Mn | -- | 0.2 | | -- | 3\n\nSource: \n", "cas_number": "7439965", "file": "manganese-fume-as-mn-2.md", "generated": true, "harvested": "2026-08-05", "id": "manganese-fume-as-mn-2", "pel_mgm3": "0.2", "source_quote": "7439965 | | Manganese fume, as Mn | -- | 0.2 | | -- | 3", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "stel_mgm3": "3", "substance": "Manganese fume, as Mn", "title": "Manganese fume, as Mn \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Manganese fume (as Mn)\n\n**CAS No.:** 7439-96-5\n\n**PEL (mg/m\u00b3):** (C)5\n\n> Manganese fume (as Mn) | 7439-96-5 | - | (C)5 | - |\n\nSource: \n", "cas_number": "7439-96-5", "file": "manganese-fume-as-mn.md", "generated": true, "harvested": "2026-08-05", "id": "manganese-fume-as-mn", "pel_mgm3": "(C)5", "source_quote": "Manganese fume (as Mn) | 7439-96-5 | - | (C)5 | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Manganese fume (as Mn)", "title": "Manganese fume (as Mn) \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Manganese tetroxide (as Mn)\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Manganese tetroxide (as Mn)\n\n**CAS No.:** 1317-35-7\n\n> CAS No. 1317-35-7\n\n**NIOSH REL, as stated:** See Appendix D\n\n> NIOSH REL See Appendix D\n\nSource: \n", "cas_number": "1317-35-7", "file": "manganese-tetroxide-as-mn.md", "generated": true, "harvested": "2026-09-08", "id": "manganese-tetroxide-as-mn", "quote_cas_number": "CAS No. 1317-35-7", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Manganese tetroxide (as Mn)", "rel_statement": "See Appendix D", "source_quote": "NIOSH REL See Appendix D", "sources": ["https://www.cdc.gov/niosh/npg/npgd0381.html"], "stale_after": "2027-09-08", "substance": "Manganese tetroxide (as Mn)", "title": "Manganese tetroxide (as Mn) \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Marble\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Marble\n\n**CAS No.:** 1317-65-3\n\n> CAS No. 1317-65-3\n\n**NIOSH REL, as stated:** TWA 10 mg/m3 (total) TWA 5 mg/m3 (resp)\n\n> NIOSH REL TWA 10 mg/m3 (total) TWA 5 mg/m3 (resp)\n\nSource: \n", "cas_number": "1317-65-3", "file": "marble-2.md", "generated": true, "harvested": "2026-09-08", "id": "marble-2", "quote_cas_number": "CAS No. 1317-65-3", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Marble", "rel_statement": "TWA 10 mg/m3 (total) TWA 5 mg/m3 (resp)", "source_quote": "NIOSH REL TWA 10 mg/m3 (total) TWA 5 mg/m3 (resp)", "sources": ["https://www.cdc.gov/niosh/npg/npgd0382.html"], "stale_after": "2027-09-08", "substance": "Marble", "title": "Marble \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Marble\n\n**CAS No.:** 1317-65-3\n\n> Marble | 1317-65-3 | - | - | - |\n\nSource: \n", "cas_number": "1317-65-3", "file": "marble.md", "generated": true, "harvested": "2026-08-05", "id": "marble", "source_quote": "Marble | 1317-65-3 | - | - | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Marble", "title": "Marble \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** MDA; see 4,4\u2032-Methylene dianiline\n\n**CAS No.:** 101779\n\n> 101779 | S | MDA; see 4,4\u2032-Methylene dianiline\n\nSource: \n", "cas_number": "101779", "file": "mda-see-4-4-methylene-dianiline.md", "generated": true, "harvested": "2026-08-05", "id": "mda-see-4-4-methylene-dianiline", "source_quote": "101779 | S | MDA; see 4,4\u2032-Methylene dianiline", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "MDA; see 4,4\u2032-Methylene dianiline", "title": "MDA; see 4,4\u2032-Methylene dianiline \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** MDI; see Methylene bis(phenylisocyanate)\n\n**CAS No.:** 101688\n\n> 101688 | | MDI; see Methylene bis(phenylisocyanate)\n\nSource: \n", "cas_number": "101688", "file": "mdi-see-methylene-bis-phenylisocyanate.md", "generated": true, "harvested": "2026-08-05", "id": "mdi-see-methylene-bis-phenylisocyanate", "source_quote": "101688 | | MDI; see Methylene bis(phenylisocyanate)", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "MDI; see Methylene bis(phenylisocyanate)", "title": "MDI; see Methylene bis(phenylisocyanate) \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Mercury alkyls, as Hg\n\n**CAS No.:** 7439976\n\n**PEL (mg/m\u00b3):** 0.01\n\n**Ceiling:** 0.04 mg/M3\n\n**STEL (mg/m\u00b3):** 0.03\n\n> 7439976 | S | Mercury alkyls, as Hg | -- | 0.01 | 0.04 mg/M3 | -- | 0.03\n\nSource: \n", "cas_number": "7439976", "ceiling": "0.04 mg/M3", "file": "mercury-alkyls-as-hg.md", "generated": true, "harvested": "2026-08-05", "id": "mercury-alkyls-as-hg", "pel_mgm3": "0.01", "source_quote": "7439976 | S | Mercury alkyls, as Hg | -- | 0.01 | 0.04 mg/M3 | -- | 0.03", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "stel_mgm3": "0.03", "substance": "Mercury alkyls, as Hg", "title": "Mercury alkyls, as Hg \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Mercury (aryl and inorganic) (as Hg)\n\n**CAS No.:** 7439-97-6\n\n> Mercury (aryl and inorganic) (as Hg) | 7439-97-6 | - | (2) | - |\n\nSource: \n", "cas_number": "7439-97-6", "file": "mercury-aryl-and-inorganic-as-hg.md", "generated": true, "harvested": "2026-08-05", "id": "mercury-aryl-and-inorganic-as-hg", "source_quote": "Mercury (aryl and inorganic) (as Hg) | 7439-97-6 | - | (2) | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Mercury (aryl and inorganic) (as Hg)", "title": "Mercury (aryl and inorganic) (as Hg) \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Mercury aryl compounds as Hg\n\n**CAS No.:** 7439976\n\n**PEL (mg/m\u00b3):** 0.1\n\n**Ceiling:** C\n\n> 7439976 | S | Mercury aryl compounds as Hg | | 0.1 | C\n\nSource: \n", "cas_number": "7439976", "ceiling": "C", "file": "mercury-aryl-compounds-as-hg.md", "generated": true, "harvested": "2026-08-05", "id": "mercury-aryl-compounds-as-hg", "pel_mgm3": "0.1", "source_quote": "7439976 | S | Mercury aryl compounds as Hg | | 0.1 | C", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Mercury aryl compounds as Hg", "title": "Mercury aryl compounds as Hg \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Mercury compounds [except (organo) alkyls] (as Hg)\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Mercury compounds [except (organo) alkyls] (as Hg)\n\n**CAS No.:** 7439-97-6 (metal)\n\n> CAS No. 7439-97-6 (metal)\n\n**NIOSH REL (mg/m\u00b3):** TWA 0.05\n\n> NIOSH REL NIOSH REL: Hg Vapor: TWA 0.05 mg/m3 [skin] Other: C 0.1 mg/m3 [skin]\n\nSource: \n", "cas_number": "7439-97-6 (metal)", "file": "mercury-compounds-except-organo-alkyls-as-hg.md", "generated": true, "harvested": "2026-09-08", "id": "mercury-compounds-except-organo-alkyls-as-hg", "quote_cas_number": "CAS No. 7439-97-6 (metal)", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Mercury compounds [except (organo) alkyls] (as Hg)", "rel_mgm3": "TWA 0.05", "source_quote": "NIOSH REL NIOSH REL: Hg Vapor: TWA 0.05 mg/m3 [skin] Other: C 0.1 mg/m3 [skin]", "sources": ["https://www.cdc.gov/niosh/npg/npgd0383.html"], "stale_after": "2027-09-08", "substance": "Mercury compounds [except (organo) alkyls] (as Hg)", "title": "Mercury compounds [except (organo) alkyls] (as Hg) \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Mercury, metallic and inorganic compounds as Hg\n\n**CAS No.:** 7439976\n\n**PEL (mg/m\u00b3):** 0.025\n\n**Ceiling:** 0.1 mg/M3\n\n> 7439976 | S | Mercury, metallic and inorganic compounds as Hg | -- | 0.025 | 0.1 mg/M3\n\nSource: \n", "cas_number": "7439976", "ceiling": "0.1 mg/M3", "file": "mercury-metallic-and-inorganic-compounds-as-hg.md", "generated": true, "harvested": "2026-08-05", "id": "mercury-metallic-and-inorganic-compounds-as-hg", "pel_mgm3": "0.025", "source_quote": "7439976 | S | Mercury, metallic and inorganic compounds as Hg | -- | 0.025 | 0.1 mg/M3", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Mercury, metallic and inorganic compounds as Hg", "title": "Mercury, metallic and inorganic compounds as Hg \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Mercury (organo) alkyl compounds (as Hg)\n\n**CAS No.:** 7439-97-6\n\n> Mercury (organo) alkyl compounds (as Hg) | 7439-97-6 | - | (2) | - |\n\nSource: \n", "cas_number": "7439-97-6", "file": "mercury-organo-alkyl-compounds-as-hg.md", "generated": true, "harvested": "2026-08-05", "id": "mercury-organo-alkyl-compounds-as-hg", "source_quote": "Mercury (organo) alkyl compounds (as Hg) | 7439-97-6 | - | (2) | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Mercury (organo) alkyl compounds (as Hg)", "title": "Mercury (organo) alkyl compounds (as Hg) \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Mercury (vapor) (as Hg)\n\n**CAS No.:** 7439-97-6\n\n> Mercury (vapor) (as Hg) | 7439-97-6 | - | (2) | - |\n\nSource: \n", "cas_number": "7439-97-6", "file": "mercury-vapor-as-hg.md", "generated": true, "harvested": "2026-08-05", "id": "mercury-vapor-as-hg", "source_quote": "Mercury (vapor) (as Hg) | 7439-97-6 | - | (2) | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Mercury (vapor) (as Hg)", "title": "Mercury (vapor) (as Hg) \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Mesityl oxide\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Mesityl oxide\n\n**CAS No.:** 141-79-7\n\n> CAS No. 141-79-7\n\n**NIOSH REL (ppm):** TWA 10\n\n**NIOSH REL (mg/m\u00b3):** 40\n\n> NIOSH REL TWA 10 ppm (40 mg/m3)\n\nSource: \n", "cas_number": "141-79-7", "file": "mesityl-oxide-2.md", "generated": true, "harvested": "2026-09-08", "id": "mesityl-oxide-2", "quote_cas_number": "CAS No. 141-79-7", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Mesityl oxide", "rel_mgm3": "40", "rel_ppm": "TWA 10", "source_quote": "NIOSH REL TWA 10 ppm (40 mg/m3)", "sources": ["https://www.cdc.gov/niosh/npg/npgd0385.html"], "stale_after": "2027-09-08", "substance": "Mesityl oxide", "title": "Mesityl oxide \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Mesityl oxide; 4-methyl-3-pentene-2-one\n\n**CAS No.:** 141797\n\n**PEL (ppm):** 15\n\n**PEL (mg/m\u00b3):** 60\n\n**STEL (ppm):** 25\n\n**STEL (mg/m\u00b3):** 100\n\n> 141797 | | Mesityl oxide; 4-methyl-3-pentene-2-one | 15 | 60 | | 25 | 100\n\nSource: \n", "cas_number": "141797", "file": "mesityl-oxide-4-methyl-3-pentene-2-one.md", "generated": true, "harvested": "2026-08-05", "id": "mesityl-oxide-4-methyl-3-pentene-2-one", "pel_mgm3": "60", "pel_ppm": "15", "source_quote": "141797 | | Mesityl oxide; 4-methyl-3-pentene-2-one | 15 | 60 | | 25 | 100", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "stel_mgm3": "100", "stel_ppm": "25", "substance": "Mesityl oxide; 4-methyl-3-pentene-2-one", "title": "Mesityl oxide; 4-methyl-3-pentene-2-one \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Mesityl oxide\n\n**CAS No.:** 141-79-7\n\n**PEL (ppm):** 25\n\n**PEL (mg/m\u00b3):** 100\n\n> Mesityl oxide | 141-79-7 | 25 | 100 | - |\n\nSource: \n", "cas_number": "141-79-7", "file": "mesityl-oxide.md", "generated": true, "harvested": "2026-08-05", "id": "mesityl-oxide", "pel_mgm3": "100", "pel_ppm": "25", "source_quote": "Mesityl oxide | 141-79-7 | 25 | 100 | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Mesityl oxide", "title": "Mesityl oxide \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Mesitylene; see 1,3,5-Trimethylbenzene\n\n**CAS No.:** 108678\n\n> 108678 | | Mesitylene; see 1,3,5-Trimethylbenzene\n\nSource: \n", "cas_number": "108678", "file": "mesitylene-see-1-3-5-trimethylbenzene.md", "generated": true, "harvested": "2026-08-05", "id": "mesitylene-see-1-3-5-trimethylbenzene", "source_quote": "108678 | | Mesitylene; see 1,3,5-Trimethylbenzene", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Mesitylene; see 1,3,5-Trimethylbenzene", "title": "Mesitylene; see 1,3,5-Trimethylbenzene \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** (meta)\n\n**CAS No.:** 99-65-0\n\n> (meta) | 99-65-0 | - | - | - |\n\nSource: \n", "cas_number": "99-65-0", "file": "meta.md", "generated": true, "harvested": "2026-08-05", "id": "meta", "source_quote": "(meta) | 99-65-0 | - | - | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "(meta)", "title": "(meta) \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Methacrylic acid\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Methacrylic acid\n\n**CAS No.:** 79-41-4\n\n> CAS No. 79-41-4\n\n**NIOSH REL (ppm):** TWA 20\n\n**NIOSH REL (mg/m\u00b3):** 70\n\n> NIOSH REL TWA 20 ppm (70 mg/m3) [skin]\n\nSource: \n", "cas_number": "79-41-4", "file": "methacrylic-acid-2.md", "generated": true, "harvested": "2026-09-08", "id": "methacrylic-acid-2", "quote_cas_number": "CAS No. 79-41-4", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Methacrylic acid", "rel_mgm3": "70", "rel_ppm": "TWA 20", "source_quote": "NIOSH REL TWA 20 ppm (70 mg/m3) [skin]", "sources": ["https://www.cdc.gov/niosh/npg/npgd0386.html"], "stale_after": "2027-09-08", "substance": "Methacrylic acid", "title": "Methacrylic acid \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Methacrylic acid\n\n**CAS No.:** 79414\n\n**PEL (ppm):** 20\n\n**PEL (mg/m\u00b3):** 70\n\n> 79414 | S | Methacrylic acid | 20 | 70\n\nSource: \n", "cas_number": "79414", "file": "methacrylic-acid.md", "generated": true, "harvested": "2026-08-05", "id": "methacrylic-acid", "pel_mgm3": "70", "pel_ppm": "20", "source_quote": "79414 | S | Methacrylic acid | 20 | 70", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Methacrylic acid", "title": "Methacrylic acid \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Methane\n\n**CAS No.:** 74828\n\n> 74828 | | Methane | (h) | --\n\nSource: \n", "cas_number": "74828", "file": "methane.md", "generated": true, "harvested": "2026-08-05", "id": "methane", "source_quote": "74828 | | Methane | (h) | --", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Methane", "title": "Methane \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Methanethiol; see Methyl mercaptan\n\n**CAS No.:** 74931\n\n> 74931 | | Methanethiol; see Methyl mercaptan\n\nSource: \n", "cas_number": "74931", "file": "methanethiol-see-methyl-mercaptan.md", "generated": true, "harvested": "2026-08-05", "id": "methanethiol-see-methyl-mercaptan", "source_quote": "74931 | | Methanethiol; see Methyl mercaptan", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Methanethiol; see Methyl mercaptan", "title": "Methanethiol; see Methyl mercaptan \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Methanol; see Methyl alcohol\n\n**CAS No.:** 67561\n\n> 67561 | | Methanol; see Methyl alcohol\n\nSource: \n", "cas_number": "67561", "file": "methanol-see-methyl-alcohol.md", "generated": true, "harvested": "2026-08-05", "id": "methanol-see-methyl-alcohol", "source_quote": "67561 | | Methanol; see Methyl alcohol", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Methanol; see Methyl alcohol", "title": "Methanol; see Methyl alcohol \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Methomyl\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Methomyl\n\n**CAS No.:** 16752-77-5\n\n> CAS No. 16752-77-5\n\n**NIOSH REL (mg/m\u00b3):** TWA 2.5\n\n> NIOSH REL TWA 2.5 mg/m3\n\nSource: \n", "cas_number": "16752-77-5", "file": "methomyl-2.md", "generated": true, "harvested": "2026-09-08", "id": "methomyl-2", "quote_cas_number": "CAS No. 16752-77-5", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Methomyl", "rel_mgm3": "TWA 2.5", "source_quote": "NIOSH REL TWA 2.5 mg/m3", "sources": ["https://www.cdc.gov/niosh/npg/npgd0387.html"], "stale_after": "2027-09-08", "substance": "Methomyl", "title": "Methomyl \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Methomyl\n\n**CAS No.:** 16752775\n\n**PEL (mg/m\u00b3):** 2.5\n\n> 16752775 | S | Methomyl | -- | 2.5\n\nSource: \n", "cas_number": "16752775", "file": "methomyl.md", "generated": true, "harvested": "2026-08-05", "id": "methomyl", "pel_mgm3": "2.5", "source_quote": "16752775 | S | Methomyl | -- | 2.5", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Methomyl", "title": "Methomyl \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Methoxychlor; 1,1,1-trichloro-2, 2-bis(p-methoxyphenyl)ethane\n\n**CAS No.:** 72435\n\n**PEL (mg/m\u00b3):** 10\n\n> 72435 | | Methoxychlor; 1,1,1-trichloro-2, 2-bis(p-methoxyphenyl)ethane | -- | 10\n\nSource: \n", "cas_number": "72435", "file": "methoxychlor-1-1-1-trichloro-2-2-bis-p-methoxyphenyl-ethane.md", "generated": true, "harvested": "2026-08-05", "id": "methoxychlor-1-1-1-trichloro-2-2-bis-p-methoxyphenyl-ethane", "pel_mgm3": "10", "source_quote": "72435 | | Methoxychlor; 1,1,1-trichloro-2, 2-bis(p-methoxyphenyl)ethane | -- | 10", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Methoxychlor; 1,1,1-trichloro-2, 2-bis(p-methoxyphenyl)ethane", "title": "Methoxychlor; 1,1,1-trichloro-2, 2-bis(p-methoxyphenyl)ethane \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Methoxychlor\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Methoxychlor\n\n**CAS No.:** 72-43-5\n\n> CAS No. 72-43-5\n\n**NIOSH REL, as stated:** Ca See Appendix A\n\n> NIOSH REL Ca See Appendix A\n\nSource: \n", "cas_number": "72-43-5", "file": "methoxychlor-2.md", "generated": true, "harvested": "2026-09-08", "id": "methoxychlor-2", "quote_cas_number": "CAS No. 72-43-5", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Methoxychlor", "rel_statement": "Ca See Appendix A", "source_quote": "NIOSH REL Ca See Appendix A", "sources": ["https://www.cdc.gov/niosh/npg/npgd0388.html"], "stale_after": "2027-09-08", "substance": "Methoxychlor", "title": "Methoxychlor \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Methoxychlor\n\n**CAS No.:** 72-43-5\n\n> Methoxychlor | 72-43-5 | - | - | - |\n\nSource: \n", "cas_number": "72-43-5", "file": "methoxychlor.md", "generated": true, "harvested": "2026-08-05", "id": "methoxychlor", "source_quote": "Methoxychlor | 72-43-5 | - | - | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Methoxychlor", "title": "Methoxychlor \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Methoxyflurane\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Methoxyflurane\n\n**CAS No.:** 76-38-0\n\n> CAS No. 76-38-0\n\n**NIOSH REL (ppm):** C 2\n\n**NIOSH REL (mg/m\u00b3):** 13.5\n\n> NIOSH REL C 2 ppm (13.5 mg/m3) [60-minute]\n\nSource: \n", "cas_number": "76-38-0", "file": "methoxyflurane-2.md", "generated": true, "harvested": "2026-09-08", "id": "methoxyflurane-2", "quote_cas_number": "CAS No. 76-38-0", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Methoxyflurane", "rel_mgm3": "13.5", "rel_ppm": "C 2", "source_quote": "NIOSH REL C 2 ppm (13.5 mg/m3) [60-minute]", "sources": ["https://www.cdc.gov/niosh/npg/npgd0389.html"], "stale_after": "2027-09-08", "substance": "Methoxyflurane", "title": "Methoxyflurane \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Methoxyflurane\n\n**CAS No.:** 76380\n\n**PEL (ppm):** 2\n\n**PEL (mg/m\u00b3):** 13\n\n> 76380 | | Methoxyflurane | 2 | 13\n\nSource: \n", "cas_number": "76380", "file": "methoxyflurane.md", "generated": true, "harvested": "2026-08-05", "id": "methoxyflurane", "pel_mgm3": "13", "pel_ppm": "2", "source_quote": "76380 | | Methoxyflurane | 2 | 13", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Methoxyflurane", "title": "Methoxyflurane \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Methyl-2-cyanoacrylate\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Methyl-2-cyanoacrylate\n\n**CAS No.:** 137-05-3\n\n> CAS No. 137-05-3\n\n**NIOSH REL (ppm):** TWA 2\n\n**NIOSH REL (mg/m\u00b3):** 8\n\n> NIOSH REL TWA 2 ppm (8 mg/m3) ST 4 ppm (16 mg/m3)\n\nSource: \n", "cas_number": "137-05-3", "file": "methyl-2-cyanoacrylate-2.md", "generated": true, "harvested": "2026-09-08", "id": "methyl-2-cyanoacrylate-2", "quote_cas_number": "CAS No. 137-05-3", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Methyl-2-cyanoacrylate", "rel_mgm3": "8", "rel_ppm": "TWA 2", "source_quote": "NIOSH REL TWA 2 ppm (8 mg/m3) ST 4 ppm (16 mg/m3)", "sources": ["https://www.cdc.gov/niosh/npg/npgd0405.html"], "stale_after": "2027-09-08", "substance": "Methyl-2-cyanoacrylate", "title": "Methyl-2-cyanoacrylate \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Methyl 2-cyanoacrylate\n\n**CAS No.:** 137053\n\n**PEL (ppm):** 0.2\n\n**PEL (mg/m\u00b3):** 0.908\n\n> 137053 | | Methyl 2-cyanoacrylate | 0.2 | 0.908\n\nSource: \n", "cas_number": "137053", "file": "methyl-2-cyanoacrylate.md", "generated": true, "harvested": "2026-08-05", "id": "methyl-2-cyanoacrylate", "pel_mgm3": "0.908", "pel_ppm": "0.2", "source_quote": "137053 | | Methyl 2-cyanoacrylate | 0.2 | 0.908", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Methyl 2-cyanoacrylate", "title": "Methyl 2-cyanoacrylate \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Methyl acetate\n\n**CAS No.:** 79209\n\n**PEL (ppm):** 200\n\n**PEL (mg/m\u00b3):** 610\n\n**STEL (ppm):** 250\n\n**STEL (mg/m\u00b3):** 760\n\n> 79209 | | Methyl acetate | 200 | 610 | | 250 | 760\n\nSource: \n", "cas_number": "79209", "file": "methyl-acetate-2.md", "generated": true, "harvested": "2026-08-05", "id": "methyl-acetate-2", "pel_mgm3": "610", "pel_ppm": "200", "source_quote": "79209 | | Methyl acetate | 200 | 610 | | 250 | 760", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "stel_mgm3": "760", "stel_ppm": "250", "substance": "Methyl acetate", "title": "Methyl acetate \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Methyl acetate\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Methyl acetate\n\n**CAS No.:** 79-20-9\n\n> CAS No. 79-20-9\n\n**NIOSH REL (ppm):** TWA 200\n\n**NIOSH REL (mg/m\u00b3):** 610\n\n> NIOSH REL TWA 200 ppm (610 mg/m3) ST 250 ppm (760 mg/m3)\n\nSource: \n", "cas_number": "79-20-9", "file": "methyl-acetate-3.md", "generated": true, "harvested": "2026-09-08", "id": "methyl-acetate-3", "quote_cas_number": "CAS No. 79-20-9", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Methyl acetate", "rel_mgm3": "610", "rel_ppm": "TWA 200", "source_quote": "NIOSH REL TWA 200 ppm (610 mg/m3) ST 250 ppm (760 mg/m3)", "sources": ["https://www.cdc.gov/niosh/npg/npgd0391.html"], "stale_after": "2027-09-08", "substance": "Methyl acetate", "title": "Methyl acetate \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Methyl acetate\n\n**CAS No.:** 79-20-9\n\n**PEL (ppm):** 200\n\n**PEL (mg/m\u00b3):** 610\n\n> Methyl acetate | 79-20-9 | 200 | 610 | - |\n\nSource: \n", "cas_number": "79-20-9", "file": "methyl-acetate.md", "generated": true, "harvested": "2026-08-05", "id": "methyl-acetate", "pel_mgm3": "610", "pel_ppm": "200", "source_quote": "Methyl acetate | 79-20-9 | 200 | 610 | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Methyl acetate", "title": "Methyl acetate \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Methyl acetylene-propadiene mixture\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Methyl acetylene-propadiene mixture\n\n**CAS No.:** 59355-75-8\n\n> CAS No. 59355-75-8\n\n**NIOSH REL (ppm):** TWA 1000\n\n**NIOSH REL (mg/m\u00b3):** 1800\n\n> NIOSH REL TWA 1000 ppm (1800 mg/m3) ST 1250 ppm (2250 mg/m3)\n\nSource: \n", "cas_number": "59355-75-8", "file": "methyl-acetylene-propadiene-mixture.md", "generated": true, "harvested": "2026-09-08", "id": "methyl-acetylene-propadiene-mixture", "quote_cas_number": "CAS No. 59355-75-8", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Methyl acetylene-propadiene mixture", "rel_mgm3": "1800", "rel_ppm": "TWA 1000", "source_quote": "NIOSH REL TWA 1000 ppm (1800 mg/m3) ST 1250 ppm (2250 mg/m3)", "sources": ["https://www.cdc.gov/niosh/npg/npgd0393.html"], "stale_after": "2027-09-08", "substance": "Methyl acetylene-propadiene mixture", "title": "Methyl acetylene-propadiene mixture \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Methyl acetylene; propyne\n\n**CAS No.:** 74997\n\n**PEL (ppm):** 1,000\n\n**PEL (mg/m\u00b3):** 1,650\n\n> 74997 | | Methyl acetylene; propyne | 1,000 | 1,650\n\nSource: \n", "cas_number": "74997", "file": "methyl-acetylene-propyne-2.md", "generated": true, "harvested": "2026-08-05", "id": "methyl-acetylene-propyne-2", "pel_mgm3": "1,650", "pel_ppm": "1,000", "source_quote": "74997 | | Methyl acetylene; propyne | 1,000 | 1,650", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Methyl acetylene; propyne", "title": "Methyl acetylene; propyne \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Methyl acetylene (Propyne)\n\n**CAS No.:** 74-99-7\n\n**PEL (ppm):** 1000\n\n**PEL (mg/m\u00b3):** 1650\n\n> Methyl acetylene (Propyne) | 74-99-7 | 1000 | 1650 | - |\n\nSource: \n", "cas_number": "74-99-7", "file": "methyl-acetylene-propyne.md", "generated": true, "harvested": "2026-08-05", "id": "methyl-acetylene-propyne", "pel_mgm3": "1650", "pel_ppm": "1000", "source_quote": "Methyl acetylene (Propyne) | 74-99-7 | 1000 | 1650 | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Methyl acetylene (Propyne)", "title": "Methyl acetylene (Propyne) \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Methyl acetylene\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Methyl acetylene\n\n**CAS No.:** 74-99-7\n\n> CAS No. 74-99-7\n\n**NIOSH REL (ppm):** TWA 1000\n\n**NIOSH REL (mg/m\u00b3):** 1650\n\n> NIOSH REL TWA 1000 ppm (1650 mg/m3)\n\nSource: \n", "cas_number": "74-99-7", "file": "methyl-acetylene.md", "generated": true, "harvested": "2026-09-08", "id": "methyl-acetylene", "quote_cas_number": "CAS No. 74-99-7", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Methyl acetylene", "rel_mgm3": "1650", "rel_ppm": "TWA 1000", "source_quote": "NIOSH REL TWA 1000 ppm (1650 mg/m3)", "sources": ["https://www.cdc.gov/niosh/npg/npgd0392.html"], "stale_after": "2027-09-08", "substance": "Methyl acetylene", "title": "Methyl acetylene \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Methyl acrylate\n\n**CAS No.:** 96333\n\n**PEL (ppm):** 10\n\n**PEL (mg/m\u00b3):** 35\n\n> 96333 | S | Methyl acrylate | 10 | 35\n\nSource: \n", "cas_number": "96333", "file": "methyl-acrylate-2.md", "generated": true, "harvested": "2026-08-05", "id": "methyl-acrylate-2", "pel_mgm3": "35", "pel_ppm": "10", "source_quote": "96333 | S | Methyl acrylate | 10 | 35", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Methyl acrylate", "title": "Methyl acrylate \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Methyl acrylate\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Methyl acrylate\n\n**CAS No.:** 96-33-3\n\n> CAS No. 96-33-3\n\n**NIOSH REL (ppm):** TWA 10\n\n**NIOSH REL (mg/m\u00b3):** 35\n\n> NIOSH REL TWA 10 ppm (35 mg/m3) [skin]\n\nSource: \n", "cas_number": "96-33-3", "file": "methyl-acrylate-3.md", "generated": true, "harvested": "2026-09-08", "id": "methyl-acrylate-3", "quote_cas_number": "CAS No. 96-33-3", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Methyl acrylate", "rel_mgm3": "35", "rel_ppm": "TWA 10", "source_quote": "NIOSH REL TWA 10 ppm (35 mg/m3) [skin]", "sources": ["https://www.cdc.gov/niosh/npg/npgd0394.html"], "stale_after": "2027-09-08", "substance": "Methyl acrylate", "title": "Methyl acrylate \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Methyl acrylate\n\n**CAS No.:** 96-33-3\n\n**PEL (ppm):** 10\n\n**PEL (mg/m\u00b3):** 35\n\n> Methyl acrylate | 96-33-3 | 10 | 35 | X |\n\nSource: \n", "cas_number": "96-33-3", "file": "methyl-acrylate.md", "generated": true, "harvested": "2026-08-05", "id": "methyl-acrylate", "pel_mgm3": "35", "pel_ppm": "10", "source_quote": "Methyl acrylate | 96-33-3 | 10 | 35 | X |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Methyl acrylate", "title": "Methyl acrylate \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Methyl alcohol\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Methyl alcohol\n\n**CAS No.:** 67-56-1\n\n> CAS No. 67-56-1\n\n**NIOSH REL (ppm):** TWA 200\n\n**NIOSH REL (mg/m\u00b3):** 260\n\n> NIOSH REL TWA 200 ppm (260 mg/m3) ST 250 ppm (325 mg/m3) [skin]\n\nSource: \n", "cas_number": "67-56-1", "file": "methyl-alcohol-2.md", "generated": true, "harvested": "2026-09-08", "id": "methyl-alcohol-2", "quote_cas_number": "CAS No. 67-56-1", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Methyl alcohol", "rel_mgm3": "260", "rel_ppm": "TWA 200", "source_quote": "NIOSH REL TWA 200 ppm (260 mg/m3) ST 250 ppm (325 mg/m3) [skin]", "sources": ["https://www.cdc.gov/niosh/npg/npgd0397.html"], "stale_after": "2027-09-08", "substance": "Methyl alcohol", "title": "Methyl alcohol \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Methyl alcohol; methanol\n\n**CAS No.:** 67561\n\n**PEL (ppm):** 200\n\n**PEL (mg/m\u00b3):** 260\n\n**Ceiling:** 1000 ppm\n\n**STEL (ppm):** 250\n\n**STEL (mg/m\u00b3):** 325\n\n> 67561 | S | Methyl alcohol; methanol | 200 | 260 | 1000 ppm | 250 | 325\n\nSource: \n", "cas_number": "67561", "ceiling": "1000 ppm", "file": "methyl-alcohol-methanol.md", "generated": true, "harvested": "2026-08-05", "id": "methyl-alcohol-methanol", "pel_mgm3": "260", "pel_ppm": "200", "source_quote": "67561 | S | Methyl alcohol; methanol | 200 | 260 | 1000 ppm | 250 | 325", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "stel_mgm3": "325", "stel_ppm": "250", "substance": "Methyl alcohol; methanol", "title": "Methyl alcohol; methanol \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Methyl alcohol\n\n**CAS No.:** 67-56-1\n\n**PEL (ppm):** 200\n\n**PEL (mg/m\u00b3):** 260\n\n> Methyl alcohol | 67-56-1 | 200 | 260 | - |\n\nSource: \n", "cas_number": "67-56-1", "file": "methyl-alcohol.md", "generated": true, "harvested": "2026-08-05", "id": "methyl-alcohol", "pel_mgm3": "260", "pel_ppm": "200", "source_quote": "Methyl alcohol | 67-56-1 | 200 | 260 | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Methyl alcohol", "title": "Methyl alcohol \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Methyl amyl alcohol; see Methyl isobutyl carbinol\n\n**CAS No.:** 108112\n\n> 108112 | | Methyl amyl alcohol; see Methyl isobutyl carbinol\n\nSource: \n", "cas_number": "108112", "file": "methyl-amyl-alcohol-see-methyl-isobutyl-carbinol.md", "generated": true, "harvested": "2026-08-05", "id": "methyl-amyl-alcohol-see-methyl-isobutyl-carbinol", "source_quote": "108112 | | Methyl amyl alcohol; see Methyl isobutyl carbinol", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Methyl amyl alcohol; see Methyl isobutyl carbinol", "title": "Methyl amyl alcohol; see Methyl isobutyl carbinol \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Methyl bromide\n\n**CAS No.:** 74839\n\n**PEL (ppm):** 1\n\n**PEL (mg/m\u00b3):** 3.88\n\n**Ceiling:** 20 ppm\n\n> 74839 | S | Methyl bromide | 1 | 3.88 | 20 ppm\n\nSource: \n", "cas_number": "74839", "ceiling": "20 ppm", "file": "methyl-bromide-2.md", "generated": true, "harvested": "2026-08-05", "id": "methyl-bromide-2", "pel_mgm3": "3.88", "pel_ppm": "1", "source_quote": "74839 | S | Methyl bromide | 1 | 3.88 | 20 ppm", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Methyl bromide", "title": "Methyl bromide \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Methyl bromide\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Methyl bromide\n\n**CAS No.:** 74-83-9\n\n> CAS No. 74-83-9\n\n**NIOSH REL, as stated:** Ca See Appendix A\n\n> NIOSH REL Ca See Appendix A\n\nSource: \n", "cas_number": "74-83-9", "file": "methyl-bromide-3.md", "generated": true, "harvested": "2026-09-08", "id": "methyl-bromide-3", "quote_cas_number": "CAS No. 74-83-9", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Methyl bromide", "rel_statement": "Ca See Appendix A", "source_quote": "NIOSH REL Ca See Appendix A", "sources": ["https://www.cdc.gov/niosh/npg/npgd0400.html"], "stale_after": "2027-09-08", "substance": "Methyl bromide", "title": "Methyl bromide \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Methyl bromide\n\n**CAS No.:** 74-83-9\n\n**PEL (ppm):** (C)20\n\n**PEL (mg/m\u00b3):** (C)80\n\n> Methyl bromide | 74-83-9 | (C)20 | (C)80 | X |\n\nSource: \n", "cas_number": "74-83-9", "file": "methyl-bromide.md", "generated": true, "harvested": "2026-08-05", "id": "methyl-bromide", "pel_mgm3": "(C)80", "pel_ppm": "(C)20", "source_quote": "Methyl bromide | 74-83-9 | (C)20 | (C)80 | X |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Methyl bromide", "title": "Methyl bromide \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Methyl Cellosolve\u00ae acetate\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Methyl Cellosolve\u00ae acetate\n\n**CAS No.:** 110-49-6\n\n> CAS No. 110-49-6\n\n**NIOSH REL (ppm):** TWA 0.1\n\n**NIOSH REL (mg/m\u00b3):** 0.5\n\n> NIOSH REL TWA 0.1 ppm (0.5 mg/m3) [skin]\n\nSource: \n", "cas_number": "110-49-6", "file": "methyl-cellosolve-acetate.md", "generated": true, "harvested": "2026-09-08", "id": "methyl-cellosolve-acetate", "quote_cas_number": "CAS No. 110-49-6", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Methyl Cellosolve\u00ae acetate", "rel_mgm3": "0.5", "rel_ppm": "TWA 0.1", "source_quote": "NIOSH REL TWA 0.1 ppm (0.5 mg/m3) [skin]", "sources": ["https://www.cdc.gov/niosh/npg/npgd0402.html"], "stale_after": "2027-09-08", "substance": "Methyl Cellosolve\u00ae acetate", "title": "Methyl Cellosolve\u00ae acetate \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Methyl Cellosolve\u00ae\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Methyl Cellosolve\u00ae\n\n**CAS No.:** 109-86-4\n\n> CAS No. 109-86-4\n\n**NIOSH REL (ppm):** TWA 0.1\n\n**NIOSH REL (mg/m\u00b3):** 0.3\n\n> NIOSH REL TWA 0.1 ppm (0.3 mg/m3) [skin]\n\nSource: \n", "cas_number": "109-86-4", "file": "methyl-cellosolve.md", "generated": true, "harvested": "2026-09-08", "id": "methyl-cellosolve", "quote_cas_number": "CAS No. 109-86-4", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Methyl Cellosolve\u00ae", "rel_mgm3": "0.3", "rel_ppm": "TWA 0.1", "source_quote": "NIOSH REL TWA 0.1 ppm (0.3 mg/m3) [skin]", "sources": ["https://www.cdc.gov/niosh/npg/npgd0401.html"], "stale_after": "2027-09-08", "substance": "Methyl Cellosolve\u00ae", "title": "Methyl Cellosolve\u00ae \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Methyl chloride\n\n**CAS No.:** 74873\n\n**PEL (ppm):** 50\n\n**PEL (mg/m\u00b3):** 105\n\n**Ceiling:** 300 ppm\n\n**STEL (ppm):** 100\n\n**STEL (mg/m\u00b3):** 210\n\n> 74873 | | Methyl chloride | 50 | 105 | 300 ppm | 100 | 210\n\nSource: \n", "cas_number": "74873", "ceiling": "300 ppm", "file": "methyl-chloride-2.md", "generated": true, "harvested": "2026-08-05", "id": "methyl-chloride-2", "pel_mgm3": "105", "pel_ppm": "50", "source_quote": "74873 | | Methyl chloride | 50 | 105 | 300 ppm | 100 | 210", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "stel_mgm3": "210", "stel_ppm": "100", "substance": "Methyl chloride", "title": "Methyl chloride \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Methyl chloride\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Methyl chloride\n\n**CAS No.:** 74-87-3\n\n> CAS No. 74-87-3\n\n**NIOSH REL, as stated:** Ca See Appendix A\n\n> NIOSH REL Ca See Appendix A\n\nSource: \n", "cas_number": "74-87-3", "file": "methyl-chloride-3.md", "generated": true, "harvested": "2026-09-08", "id": "methyl-chloride-3", "quote_cas_number": "CAS No. 74-87-3", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Methyl chloride", "rel_statement": "Ca See Appendix A", "source_quote": "NIOSH REL Ca See Appendix A", "sources": ["https://www.cdc.gov/niosh/npg/npgd0403.html"], "stale_after": "2027-09-08", "substance": "Methyl chloride", "title": "Methyl chloride \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Methyl chloride\n\n**CAS No.:** 74-87-3\n\n> Methyl chloride | 74-87-3 | - | (2) | - |\n\nSource: \n", "cas_number": "74-87-3", "file": "methyl-chloride.md", "generated": true, "harvested": "2026-08-05", "id": "methyl-chloride", "source_quote": "Methyl chloride | 74-87-3 | - | (2) | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Methyl chloride", "title": "Methyl chloride \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Methyl chloroform; 1,1,1-trichloroethane\n\n**CAS No.:** 71556\n\n**PEL (ppm):** 350\n\n**PEL (mg/m\u00b3):** 1900\n\n**Ceiling:** 800 ppm\n\n**STEL (ppm):** 450\n\n**STEL (mg/m\u00b3):** 2450\n\n> 71556 | | Methyl chloroform; 1,1,1-trichloroethane | 350 | 1900 | 800 ppm | 450 | 2450\n\nSource: \n", "cas_number": "71556", "ceiling": "800 ppm", "file": "methyl-chloroform-1-1-1-trichloroethane-2.md", "generated": true, "harvested": "2026-08-05", "id": "methyl-chloroform-1-1-1-trichloroethane-2", "pel_mgm3": "1900", "pel_ppm": "350", "source_quote": "71556 | | Methyl chloroform; 1,1,1-trichloroethane | 350 | 1900 | 800 ppm | 450 | 2450", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "stel_mgm3": "2450", "stel_ppm": "450", "substance": "Methyl chloroform; 1,1,1-trichloroethane", "title": "Methyl chloroform; 1,1,1-trichloroethane \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Methyl chloroform (1,1,1-Trichloroethane)\n\n**CAS No.:** 71-55-6\n\n**PEL (ppm):** 350\n\n**PEL (mg/m\u00b3):** 1900\n\n> Methyl chloroform (1,1,1-Trichloroethane) | 71-55-6 | 350 | 1900 | - |\n\nSource: \n", "cas_number": "71-55-6", "file": "methyl-chloroform-1-1-1-trichloroethane.md", "generated": true, "harvested": "2026-08-05", "id": "methyl-chloroform-1-1-1-trichloroethane", "pel_mgm3": "1900", "pel_ppm": "350", "source_quote": "Methyl chloroform (1,1,1-Trichloroethane) | 71-55-6 | 350 | 1900 | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Methyl chloroform (1,1,1-Trichloroethane)", "title": "Methyl chloroform (1,1,1-Trichloroethane) \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Methyl chloroform\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Methyl chloroform\n\n**CAS No.:** 71-55-6\n\n> CAS No. 71-55-6\n\n**NIOSH REL (ppm):** C 350\n\n**NIOSH REL (mg/m\u00b3):** 1900\n\n> NIOSH REL C 350 ppm (1900 mg/m3) [15-minute]\n\nSource: \n", "cas_number": "71-55-6", "file": "methyl-chloroform.md", "generated": true, "harvested": "2026-09-08", "id": "methyl-chloroform", "quote_cas_number": "CAS No. 71-55-6", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Methyl chloroform", "rel_mgm3": "1900", "rel_ppm": "C 350", "source_quote": "NIOSH REL C 350 ppm (1900 mg/m3) [15-minute]", "sources": ["https://www.cdc.gov/niosh/npg/npgd0404.html"], "stale_after": "2027-09-08", "substance": "Methyl chloroform", "title": "Methyl chloroform \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Methyl chloromethyl ether; see Section 5209\n\n**CAS No.:** 107302\n\n> 107302 | | Methyl chloromethyl ether; see Section 5209\n\nSource: \n", "cas_number": "107302", "file": "methyl-chloromethyl-ether-see-section-5209.md", "generated": true, "harvested": "2026-08-05", "id": "methyl-chloromethyl-ether-see-section-5209", "source_quote": "107302 | | Methyl chloromethyl ether; see Section 5209", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Methyl chloromethyl ether; see Section 5209", "title": "Methyl chloromethyl ether; see Section 5209 \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Methyl cyanide; see Acetonitrile\n\n**CAS No.:** 75058\n\n> 75058 | | Methyl cyanide; see Acetonitrile\n\nSource: \n", "cas_number": "75058", "file": "methyl-cyanide-see-acetonitrile.md", "generated": true, "harvested": "2026-08-05", "id": "methyl-cyanide-see-acetonitrile", "source_quote": "75058 | | Methyl cyanide; see Acetonitrile", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Methyl cyanide; see Acetonitrile", "title": "Methyl cyanide; see Acetonitrile \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Methyl cyclopentadienyl manganese tricarbonyl (as Mn)\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Methyl cyclopentadienyl manganese tricarbonyl (as Mn)\n\n**CAS No.:** 12108-13-3\n\n> CAS No. 12108-13-3\n\n**NIOSH REL (mg/m\u00b3):** TWA 0.2\n\n> NIOSH REL TWA 0.2 mg/m3 [skin]\n\nSource: \n", "cas_number": "12108-13-3", "file": "methyl-cyclopentadienyl-manganese-tricarbonyl-as-mn.md", "generated": true, "harvested": "2026-09-08", "id": "methyl-cyclopentadienyl-manganese-tricarbonyl-as-mn", "quote_cas_number": "CAS No. 12108-13-3", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Methyl cyclopentadienyl manganese tricarbonyl (as Mn)", "rel_mgm3": "TWA 0.2", "source_quote": "NIOSH REL TWA 0.2 mg/m3 [skin]", "sources": ["https://www.cdc.gov/niosh/npg/npgd0409.html"], "stale_after": "2027-09-08", "substance": "Methyl cyclopentadienyl manganese tricarbonyl (as Mn)", "title": "Methyl cyclopentadienyl manganese tricarbonyl (as Mn) \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Methyl demeton; a mixture of o,o-dimethyl o-(2-(ethylthio)ethyl) phosphorothioate and o,o-dimethyl S-(2-(ethylthio)-ethyl) phosphorothioate\n\n**CAS No.:** 8022002\n\n**PEL (mg/m\u00b3):** 0.5\n\n> 8022002 | S | Methyl demeton; a mixture of o,o-dimethyl o-(2-(ethylthio)ethyl) phosphorothioate and o,o-dimethyl S-(2-(ethylthio)-ethyl) phosphorothioate | -- | 0.5\n\nSource: \n", "cas_number": "8022002", "file": "methyl-demeton-a-mixture-of-o-o-dimethyl-o-2-ethylthio-ethyl-phosphorothioate-an.md", "generated": true, "harvested": "2026-08-05", "id": "methyl-demeton-a-mixture-of-o-o-dimethyl-o-2-ethylthio-ethyl-phosphorothioate-an", "pel_mgm3": "0.5", "source_quote": "8022002 | S | Methyl demeton; a mixture of o,o-dimethyl o-(2-(ethylthio)ethyl) phosphorothioate and o,o-dimethyl S-(2-(ethylthio)-ethyl) phosphorothioate | -- | 0.5", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Methyl demeton; a mixture of o,o-dimethyl o-(2-(ethylthio)ethyl) phosphorothioate and o,o-dimethyl S-(2-(ethylthio)-ethyl) phosphorothioate", "title": "Methyl demeton; a mixture of o,o-dimethyl o-(2-(ethylthio)ethyl) phosphorothioate and o,o-dimethyl S-(2-(ethylthio)-ethyl) phosphorothioate \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Methyl demeton\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Methyl demeton\n\n**CAS No.:** 8022-00-2\n\n> CAS No. 8022-00-2\n\n**NIOSH REL (mg/m\u00b3):** TWA 0.5\n\n> NIOSH REL TWA 0.5 mg/m3 [skin]\n\nSource: \n", "cas_number": "8022-00-2", "file": "methyl-demeton.md", "generated": true, "harvested": "2026-09-08", "id": "methyl-demeton", "quote_cas_number": "CAS No. 8022-00-2", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Methyl demeton", "rel_mgm3": "TWA 0.5", "source_quote": "NIOSH REL TWA 0.5 mg/m3 [skin]", "sources": ["https://www.cdc.gov/niosh/npg/npgd0410.html"], "stale_after": "2027-09-08", "substance": "Methyl demeton", "title": "Methyl demeton \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Methyl ethyl ketone; MEK; 2-butanone; ethyl methyl ketone\n\n**CAS No.:** 78933\n\n**PEL (ppm):** 200\n\n**PEL (mg/m\u00b3):** 590\n\n**STEL (ppm):** 300\n\n**STEL (mg/m\u00b3):** 885\n\n> 78933 | | Methyl ethyl ketone; MEK; 2-butanone; ethyl methyl ketone | 200 | 590 | | 300 | 885\n\nSource: \n", "cas_number": "78933", "file": "methyl-ethyl-ketone-mek-2-butanone-ethyl-methyl-ketone.md", "generated": true, "harvested": "2026-08-05", "id": "methyl-ethyl-ketone-mek-2-butanone-ethyl-methyl-ketone", "pel_mgm3": "590", "pel_ppm": "200", "source_quote": "78933 | | Methyl ethyl ketone; MEK; 2-butanone; ethyl methyl ketone | 200 | 590 | | 300 | 885", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "stel_mgm3": "885", "stel_ppm": "300", "substance": "Methyl ethyl ketone; MEK; 2-butanone; ethyl methyl ketone", "title": "Methyl ethyl ketone; MEK; 2-butanone; ethyl methyl ketone \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Methyl ethyl ketone peroxide\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Methyl ethyl ketone peroxide\n\n**CAS No.:** 1338-23-4\n\n> CAS No. 1338-23-4\n\n**NIOSH REL (ppm):** C 0.2\n\n**NIOSH REL (mg/m\u00b3):** 1.5\n\n> NIOSH REL C 0.2 ppm (1.5 mg/m3)\n\nSource: \n", "cas_number": "1338-23-4", "file": "methyl-ethyl-ketone-peroxide-2.md", "generated": true, "harvested": "2026-09-08", "id": "methyl-ethyl-ketone-peroxide-2", "quote_cas_number": "CAS No. 1338-23-4", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Methyl ethyl ketone peroxide", "rel_mgm3": "1.5", "rel_ppm": "C 0.2", "source_quote": "NIOSH REL C 0.2 ppm (1.5 mg/m3)", "sources": ["https://www.cdc.gov/niosh/npg/npgd0416.html"], "stale_after": "2027-09-08", "substance": "Methyl ethyl ketone peroxide", "title": "Methyl ethyl ketone peroxide \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Methyl ethyl ketone peroxide\n\n**CAS No.:** 1338234\n\n**PEL (ppm):** 0.2\n\n**PEL (mg/m\u00b3):** 1.5\n\n**Ceiling:** C\n\n> 1338234 | | Methyl ethyl ketone peroxide | 0.2 | 1.5 | C\n\nSource: \n", "cas_number": "1338234", "ceiling": "C", "file": "methyl-ethyl-ketone-peroxide.md", "generated": true, "harvested": "2026-08-05", "id": "methyl-ethyl-ketone-peroxide", "pel_mgm3": "1.5", "pel_ppm": "0.2", "source_quote": "1338234 | | Methyl ethyl ketone peroxide | 0.2 | 1.5 | C", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Methyl ethyl ketone peroxide", "title": "Methyl ethyl ketone peroxide \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Methyl formate\n\n**CAS No.:** 107313\n\n**PEL (ppm):** 100\n\n**PEL (mg/m\u00b3):** 250\n\n**STEL (ppm):** 150\n\n**STEL (mg/m\u00b3):** 375\n\n> 107313 | | Methyl formate | 100 | 250 | | 150 | 375\n\nSource: \n", "cas_number": "107313", "file": "methyl-formate-2.md", "generated": true, "harvested": "2026-08-05", "id": "methyl-formate-2", "pel_mgm3": "250", "pel_ppm": "100", "source_quote": "107313 | | Methyl formate | 100 | 250 | | 150 | 375", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "stel_mgm3": "375", "stel_ppm": "150", "substance": "Methyl formate", "title": "Methyl formate \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Methyl formate\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Methyl formate\n\n**CAS No.:** 107-31-3\n\n> CAS No. 107-31-3\n\n**NIOSH REL (ppm):** TWA 100\n\n**NIOSH REL (mg/m\u00b3):** 250\n\n> NIOSH REL TWA 100 ppm (250 mg/m3) ST 150 ppm (375 mg/m3)\n\nSource: \n", "cas_number": "107-31-3", "file": "methyl-formate-3.md", "generated": true, "harvested": "2026-09-08", "id": "methyl-formate-3", "quote_cas_number": "CAS No. 107-31-3", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Methyl formate", "rel_mgm3": "250", "rel_ppm": "TWA 100", "source_quote": "NIOSH REL TWA 100 ppm (250 mg/m3) ST 150 ppm (375 mg/m3)", "sources": ["https://www.cdc.gov/niosh/npg/npgd0417.html"], "stale_after": "2027-09-08", "substance": "Methyl formate", "title": "Methyl formate \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Methyl formate\n\n**CAS No.:** 107-31-3\n\n**PEL (ppm):** 100\n\n**PEL (mg/m\u00b3):** 250\n\n> Methyl formate | 107-31-3 | 100 | 250 | - |\n\nSource: \n", "cas_number": "107-31-3", "file": "methyl-formate.md", "generated": true, "harvested": "2026-08-05", "id": "methyl-formate", "pel_mgm3": "250", "pel_ppm": "100", "source_quote": "Methyl formate | 107-31-3 | 100 | 250 | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Methyl formate", "title": "Methyl formate \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Methyl hydrazine; monomethyl hydrazine\n\n**CAS No.:** 60344\n\n**PEL (ppm):** 0.01\n\n**PEL (mg/m\u00b3):** 0.019\n\n> 60344 | S | Methyl hydrazine; monomethyl hydrazine | 0.01 | 0.019\n\nSource: \n", "cas_number": "60344", "file": "methyl-hydrazine-monomethyl-hydrazine-2.md", "generated": true, "harvested": "2026-08-05", "id": "methyl-hydrazine-monomethyl-hydrazine-2", "pel_mgm3": "0.019", "pel_ppm": "0.01", "source_quote": "60344 | S | Methyl hydrazine; monomethyl hydrazine | 0.01 | 0.019", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Methyl hydrazine; monomethyl hydrazine", "title": "Methyl hydrazine; monomethyl hydrazine \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Methyl hydrazine (Monomethyl hydrazine)\n\n**CAS No.:** 60-34-4\n\n**PEL (ppm):** (C)0.2\n\n**PEL (mg/m\u00b3):** (C)0.35\n\n> Methyl hydrazine (Monomethyl hydrazine) | 60-34-4 | (C)0.2 | (C)0.35 | X |\n\nSource: \n", "cas_number": "60-34-4", "file": "methyl-hydrazine-monomethyl-hydrazine.md", "generated": true, "harvested": "2026-08-05", "id": "methyl-hydrazine-monomethyl-hydrazine", "pel_mgm3": "(C)0.35", "pel_ppm": "(C)0.2", "source_quote": "Methyl hydrazine (Monomethyl hydrazine) | 60-34-4 | (C)0.2 | (C)0.35 | X |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Methyl hydrazine (Monomethyl hydrazine)", "title": "Methyl hydrazine (Monomethyl hydrazine) \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Methyl hydrazine\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Methyl hydrazine\n\n**CAS No.:** 60-34-4\n\n> CAS No. 60-34-4\n\n**NIOSH REL (ppm):** C 0.04\n\n**NIOSH REL (mg/m\u00b3):** 0.08\n\n> NIOSH REL Ca C 0.04 ppm (0.08 mg/m3) [2-hr]\n\nSource: \n", "cas_number": "60-34-4", "file": "methyl-hydrazine.md", "generated": true, "harvested": "2026-09-08", "id": "methyl-hydrazine", "quote_cas_number": "CAS No. 60-34-4", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Methyl hydrazine", "rel_mgm3": "0.08", "rel_ppm": "C 0.04", "source_quote": "NIOSH REL Ca C 0.04 ppm (0.08 mg/m3) [2-hr]", "sources": ["https://www.cdc.gov/niosh/npg/npgd0419.html"], "stale_after": "2027-09-08", "substance": "Methyl hydrazine", "title": "Methyl hydrazine \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Methyl iodide\n\n**CAS No.:** 74884\n\n**PEL (ppm):** 2\n\n**PEL (mg/m\u00b3):** 10\n\n> 74884 | S | Methyl iodide | 2 | 10\n\nSource: \n", "cas_number": "74884", "file": "methyl-iodide-2.md", "generated": true, "harvested": "2026-08-05", "id": "methyl-iodide-2", "pel_mgm3": "10", "pel_ppm": "2", "source_quote": "74884 | S | Methyl iodide | 2 | 10", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Methyl iodide", "title": "Methyl iodide \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Methyl iodide\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Methyl iodide\n\n**CAS No.:** 74-88-4\n\n> CAS No. 74-88-4\n\n**NIOSH REL (ppm):** TWA 2\n\n**NIOSH REL (mg/m\u00b3):** 10\n\n> NIOSH REL Ca TWA 2 ppm (10 mg/m3) [skin]\n\nSource: \n", "cas_number": "74-88-4", "file": "methyl-iodide-3.md", "generated": true, "harvested": "2026-09-08", "id": "methyl-iodide-3", "quote_cas_number": "CAS No. 74-88-4", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Methyl iodide", "rel_mgm3": "10", "rel_ppm": "TWA 2", "source_quote": "NIOSH REL Ca TWA 2 ppm (10 mg/m3) [skin]", "sources": ["https://www.cdc.gov/niosh/npg/npgd0420.html"], "stale_after": "2027-09-08", "substance": "Methyl iodide", "title": "Methyl iodide \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Methyl iodide\n\n**CAS No.:** 74-88-4\n\n**PEL (ppm):** 5\n\n**PEL (mg/m\u00b3):** 28\n\n> Methyl iodide | 74-88-4 | 5 | 28 | X |\n\nSource: \n", "cas_number": "74-88-4", "file": "methyl-iodide.md", "generated": true, "harvested": "2026-08-05", "id": "methyl-iodide", "pel_mgm3": "28", "pel_ppm": "5", "source_quote": "Methyl iodide | 74-88-4 | 5 | 28 | X |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Methyl iodide", "title": "Methyl iodide \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Methyl isoamyl ketone\n\n**CAS No.:** 110123\n\n**PEL (ppm):** 50\n\n**PEL (mg/m\u00b3):** 234\n\n> 110123 | | Methyl isoamyl ketone | 50 | 234\n\nSource: \n", "cas_number": "110123", "file": "methyl-isoamyl-ketone-2.md", "generated": true, "harvested": "2026-08-05", "id": "methyl-isoamyl-ketone-2", "pel_mgm3": "234", "pel_ppm": "50", "source_quote": "110123 | | Methyl isoamyl ketone | 50 | 234", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Methyl isoamyl ketone", "title": "Methyl isoamyl ketone \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Methyl isoamyl ketone\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Methyl isoamyl ketone\n\n**CAS No.:** 110-12-3\n\n> CAS No. 110-12-3\n\n**NIOSH REL (ppm):** TWA 50\n\n**NIOSH REL (mg/m\u00b3):** 240\n\n> NIOSH REL TWA 50 ppm (240 mg/m3)\n\nSource: \n", "cas_number": "110-12-3", "file": "methyl-isoamyl-ketone-3.md", "generated": true, "harvested": "2026-09-08", "id": "methyl-isoamyl-ketone-3", "quote_cas_number": "CAS No. 110-12-3", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Methyl isoamyl ketone", "rel_mgm3": "240", "rel_ppm": "TWA 50", "source_quote": "NIOSH REL TWA 50 ppm (240 mg/m3)", "sources": ["https://www.cdc.gov/niosh/npg/npgd0421.html"], "stale_after": "2027-09-08", "substance": "Methyl isoamyl ketone", "title": "Methyl isoamyl ketone \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Methyl isoamyl ketone\n\n**CAS No.:** 110-12-3\n\n**PEL (ppm):** 100\n\n**PEL (mg/m\u00b3):** 475\n\n> Methyl isoamyl ketone | 110-12-3 | 100 | 475 | - |\n\nSource: \n", "cas_number": "110-12-3", "file": "methyl-isoamyl-ketone.md", "generated": true, "harvested": "2026-08-05", "id": "methyl-isoamyl-ketone", "pel_mgm3": "475", "pel_ppm": "100", "source_quote": "Methyl isoamyl ketone | 110-12-3 | 100 | 475 | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Methyl isoamyl ketone", "title": "Methyl isoamyl ketone \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Methyl isobutyl carbinol\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Methyl isobutyl carbinol\n\n**CAS No.:** 108-11-2\n\n> CAS No. 108-11-2\n\n**NIOSH REL (ppm):** TWA 25\n\n**NIOSH REL (mg/m\u00b3):** 100\n\n> NIOSH REL TWA 25 ppm (100 mg/m3) ST 40 ppm (165 mg/m3) [skin]\n\nSource: \n", "cas_number": "108-11-2", "file": "methyl-isobutyl-carbinol-2.md", "generated": true, "harvested": "2026-09-08", "id": "methyl-isobutyl-carbinol-2", "quote_cas_number": "CAS No. 108-11-2", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Methyl isobutyl carbinol", "rel_mgm3": "100", "rel_ppm": "TWA 25", "source_quote": "NIOSH REL TWA 25 ppm (100 mg/m3) ST 40 ppm (165 mg/m3) [skin]", "sources": ["https://www.cdc.gov/niosh/npg/npgd0422.html"], "stale_after": "2027-09-08", "substance": "Methyl isobutyl carbinol", "title": "Methyl isobutyl carbinol \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Methyl isobutyl carbinol; 4-methyl-2-pentanol; methyl amyl alcohol\n\n**CAS No.:** 108112\n\n**PEL (ppm):** 25\n\n**PEL (mg/m\u00b3):** 100\n\n**STEL (ppm):** 40\n\n**STEL (mg/m\u00b3):** 165\n\n> 108112 | S | Methyl isobutyl carbinol; 4-methyl-2-pentanol; methyl amyl alcohol | 25 | 100 | | 40 | 165\n\nSource: \n", "cas_number": "108112", "file": "methyl-isobutyl-carbinol-4-methyl-2-pentanol-methyl-amyl-alcohol.md", "generated": true, "harvested": "2026-08-05", "id": "methyl-isobutyl-carbinol-4-methyl-2-pentanol-methyl-amyl-alcohol", "pel_mgm3": "100", "pel_ppm": "25", "source_quote": "108112 | S | Methyl isobutyl carbinol; 4-methyl-2-pentanol; methyl amyl alcohol | 25 | 100 | | 40 | 165", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "stel_mgm3": "165", "stel_ppm": "40", "substance": "Methyl isobutyl carbinol; 4-methyl-2-pentanol; methyl amyl alcohol", "title": "Methyl isobutyl carbinol; 4-methyl-2-pentanol; methyl amyl alcohol \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Methyl isobutyl carbinol\n\n**CAS No.:** 108-11-2\n\n**PEL (ppm):** 25\n\n**PEL (mg/m\u00b3):** 100\n\n> Methyl isobutyl carbinol | 108-11-2 | 25 | 100 | X |\n\nSource: \n", "cas_number": "108-11-2", "file": "methyl-isobutyl-carbinol.md", "generated": true, "harvested": "2026-08-05", "id": "methyl-isobutyl-carbinol", "pel_mgm3": "100", "pel_ppm": "25", "source_quote": "Methyl isobutyl carbinol | 108-11-2 | 25 | 100 | X |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Methyl isobutyl carbinol", "title": "Methyl isobutyl carbinol \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Methyl isobutyl ketone; Hexone\n\n**CAS No.:** 108101\n\n**PEL (ppm):** 50\n\n**PEL (mg/m\u00b3):** 205\n\n**STEL (ppm):** 75\n\n**STEL (mg/m\u00b3):** 300\n\n> 108101 | | Methyl isobutyl ketone; Hexone | 50 | 205 | | 75 | 300\n\nSource: \n", "cas_number": "108101", "file": "methyl-isobutyl-ketone-hexone.md", "generated": true, "harvested": "2026-08-05", "id": "methyl-isobutyl-ketone-hexone", "pel_mgm3": "205", "pel_ppm": "50", "source_quote": "108101 | | Methyl isobutyl ketone; Hexone | 50 | 205 | | 75 | 300", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "stel_mgm3": "300", "stel_ppm": "75", "substance": "Methyl isobutyl ketone; Hexone", "title": "Methyl isobutyl ketone; Hexone \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Methyl isocyanate\n\n**CAS No.:** 624839\n\n**PEL (ppm):** 0.02\n\n**PEL (mg/m\u00b3):** 0.05\n\n> 624839 | S | Methyl isocyanate | 0.02 | 0.05\n\nSource: \n", "cas_number": "624839", "file": "methyl-isocyanate-2.md", "generated": true, "harvested": "2026-08-05", "id": "methyl-isocyanate-2", "pel_mgm3": "0.05", "pel_ppm": "0.02", "source_quote": "624839 | S | Methyl isocyanate | 0.02 | 0.05", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Methyl isocyanate", "title": "Methyl isocyanate \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Methyl isocyanate\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Methyl isocyanate\n\n**CAS No.:** 624-83-9\n\n> CAS No. 624-83-9\n\n**NIOSH REL (ppm):** TWA 0.02\n\n**NIOSH REL (mg/m\u00b3):** 0.05\n\n> NIOSH REL TWA 0.02 ppm (0.05 mg/m\u00b3) [skin]\n\nSource: \n", "cas_number": "624-83-9", "file": "methyl-isocyanate-3.md", "generated": true, "harvested": "2026-09-08", "id": "methyl-isocyanate-3", "quote_cas_number": "CAS No. 624-83-9", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Methyl isocyanate", "rel_mgm3": "0.05", "rel_ppm": "TWA 0.02", "source_quote": "NIOSH REL TWA 0.02 ppm (0.05 mg/m\u00b3) [skin]", "sources": ["https://www.cdc.gov/niosh/npg/npgd0423.html"], "stale_after": "2027-09-08", "substance": "Methyl isocyanate", "title": "Methyl isocyanate \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Methyl isocyanate\n\n**CAS No.:** 624-83-9\n\n**PEL (ppm):** 0.02\n\n**PEL (mg/m\u00b3):** 0.05\n\n> Methyl isocyanate | 624-83-9 | 0.02 | 0.05 | X |\n\nSource: \n", "cas_number": "624-83-9", "file": "methyl-isocyanate.md", "generated": true, "harvested": "2026-08-05", "id": "methyl-isocyanate", "pel_mgm3": "0.05", "pel_ppm": "0.02", "source_quote": "Methyl isocyanate | 624-83-9 | 0.02 | 0.05 | X |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Methyl isocyanate", "title": "Methyl isocyanate \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Methyl isopropyl ketone\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Methyl isopropyl ketone\n\n**CAS No.:** 563-80-4\n\n> CAS No. 563-80-4\n\n**NIOSH REL (ppm):** TWA 200\n\n**NIOSH REL (mg/m\u00b3):** 705\n\n> NIOSH REL TWA 200 ppm (705 mg/m3)\n\nSource: \n", "cas_number": "563-80-4", "file": "methyl-isopropyl-ketone-2.md", "generated": true, "harvested": "2026-09-08", "id": "methyl-isopropyl-ketone-2", "quote_cas_number": "CAS No. 563-80-4", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Methyl isopropyl ketone", "rel_mgm3": "705", "rel_ppm": "TWA 200", "source_quote": "NIOSH REL TWA 200 ppm (705 mg/m3)", "sources": ["https://www.cdc.gov/niosh/npg/npgd0424.html"], "stale_after": "2027-09-08", "substance": "Methyl isopropyl ketone", "title": "Methyl isopropyl ketone \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Methyl isopropyl ketone\n\n**CAS No.:** 563804\n\n**PEL (ppm):** 200\n\n**PEL (mg/m\u00b3):** 705\n\n> 563804 | | Methyl isopropyl ketone | 200 | 705\n\nSource: \n", "cas_number": "563804", "file": "methyl-isopropyl-ketone.md", "generated": true, "harvested": "2026-08-05", "id": "methyl-isopropyl-ketone", "pel_mgm3": "705", "pel_ppm": "200", "source_quote": "563804 | | Methyl isopropyl ketone | 200 | 705", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Methyl isopropyl ketone", "title": "Methyl isopropyl ketone \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Methyl mercaptan\n\n**CAS No.:** 74931\n\n**PEL (ppm):** 0.5\n\n**PEL (mg/m\u00b3):** 1\n\n> 74931 | | Methyl mercaptan | 0.5 | 1\n\nSource: \n", "cas_number": "74931", "file": "methyl-mercaptan-2.md", "generated": true, "harvested": "2026-08-05", "id": "methyl-mercaptan-2", "pel_mgm3": "1", "pel_ppm": "0.5", "source_quote": "74931 | | Methyl mercaptan | 0.5 | 1", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Methyl mercaptan", "title": "Methyl mercaptan \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Methyl mercaptan\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Methyl mercaptan\n\n**CAS No.:** 74-93-1\n\n> CAS No. 74-93-1\n\n**NIOSH REL (ppm):** C 0.5\n\n**NIOSH REL (mg/m\u00b3):** 1\n\n> NIOSH REL C 0.5 ppm (1 mg/m3) [15-minute]\n\nSource: \n", "cas_number": "74-93-1", "file": "methyl-mercaptan-3.md", "generated": true, "harvested": "2026-09-08", "id": "methyl-mercaptan-3", "quote_cas_number": "CAS No. 74-93-1", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Methyl mercaptan", "rel_mgm3": "1", "rel_ppm": "C 0.5", "source_quote": "NIOSH REL C 0.5 ppm (1 mg/m3) [15-minute]", "sources": ["https://www.cdc.gov/niosh/npg/npgd0425.html"], "stale_after": "2027-09-08", "substance": "Methyl mercaptan", "title": "Methyl mercaptan \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Methyl mercaptan\n\n**CAS No.:** 74-93-1\n\n**PEL (ppm):** (C)10\n\n**PEL (mg/m\u00b3):** (C)20\n\n> Methyl mercaptan | 74-93-1 | (C)10 | (C)20 | - |\n\nSource: \n", "cas_number": "74-93-1", "file": "methyl-mercaptan.md", "generated": true, "harvested": "2026-08-05", "id": "methyl-mercaptan", "pel_mgm3": "(C)20", "pel_ppm": "(C)10", "source_quote": "Methyl mercaptan | 74-93-1 | (C)10 | (C)20 | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Methyl mercaptan", "title": "Methyl mercaptan \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Methyl methacrylate\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Methyl methacrylate\n\n**CAS No.:** 80-62-6\n\n> CAS No. 80-62-6\n\n**NIOSH REL (ppm):** TWA 100\n\n**NIOSH REL (mg/m\u00b3):** 410\n\n> NIOSH REL TWA 100 ppm (410 mg/m3)\n\nSource: \n", "cas_number": "80-62-6", "file": "methyl-methacrylate-2.md", "generated": true, "harvested": "2026-09-08", "id": "methyl-methacrylate-2", "quote_cas_number": "CAS No. 80-62-6", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Methyl methacrylate", "rel_mgm3": "410", "rel_ppm": "TWA 100", "source_quote": "NIOSH REL TWA 100 ppm (410 mg/m3)", "sources": ["https://www.cdc.gov/niosh/npg/npgd0426.html"], "stale_after": "2027-09-08", "substance": "Methyl methacrylate", "title": "Methyl methacrylate \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Methyl methacrylate; methyl 2-methyl-2-propenoate\n\n**CAS No.:** 80626\n\n**PEL (ppm):** 50\n\n**PEL (mg/m\u00b3):** 205\n\n**STEL (ppm):** 100\n\n**STEL (mg/m\u00b3):** 410\n\n> 80626 | | Methyl methacrylate; methyl 2-methyl-2-propenoate | 50 | 205 | | 100 | 410\n\nSource: \n", "cas_number": "80626", "file": "methyl-methacrylate-methyl-2-methyl-2-propenoate.md", "generated": true, "harvested": "2026-08-05", "id": "methyl-methacrylate-methyl-2-methyl-2-propenoate", "pel_mgm3": "205", "pel_ppm": "50", "source_quote": "80626 | | Methyl methacrylate; methyl 2-methyl-2-propenoate | 50 | 205 | | 100 | 410", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "stel_mgm3": "410", "stel_ppm": "100", "substance": "Methyl methacrylate; methyl 2-methyl-2-propenoate", "title": "Methyl methacrylate; methyl 2-methyl-2-propenoate \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Methyl methacrylate\n\n**CAS No.:** 80-62-6\n\n**PEL (ppm):** 100\n\n**PEL (mg/m\u00b3):** 410\n\n> Methyl methacrylate | 80-62-6 | 100 | 410 | - |\n\nSource: \n", "cas_number": "80-62-6", "file": "methyl-methacrylate.md", "generated": true, "harvested": "2026-08-05", "id": "methyl-methacrylate", "pel_mgm3": "410", "pel_ppm": "100", "source_quote": "Methyl methacrylate | 80-62-6 | 100 | 410 | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Methyl methacrylate", "title": "Methyl methacrylate \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Methyl n-amyl ketone; 2-heptanone\n\n**CAS No.:** 110430\n\n**PEL (ppm):** 50\n\n**PEL (mg/m\u00b3):** 235\n\n> 110430 | | Methyl n-amyl ketone; 2-heptanone | 50 | 235\n\nSource: \n", "cas_number": "110430", "file": "methyl-n-amyl-ketone-2-heptanone.md", "generated": true, "harvested": "2026-08-05", "id": "methyl-n-amyl-ketone-2-heptanone", "pel_mgm3": "235", "pel_ppm": "50", "source_quote": "110430 | | Methyl n-amyl ketone; 2-heptanone | 50 | 235", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Methyl n-amyl ketone; 2-heptanone", "title": "Methyl n-amyl ketone; 2-heptanone \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Methyl (n-amyl) ketone\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Methyl (n-amyl) ketone\n\n**CAS No.:** 110-43-0\n\n> CAS No. 110-43-0\n\n**NIOSH REL (ppm):** TWA 100\n\n**NIOSH REL (mg/m\u00b3):** 465\n\n> NIOSH REL TWA 100 ppm (465 mg/m3)\n\nSource: \n", "cas_number": "110-43-0", "file": "methyl-n-amyl-ketone-2.md", "generated": true, "harvested": "2026-09-08", "id": "methyl-n-amyl-ketone-2", "quote_cas_number": "CAS No. 110-43-0", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Methyl (n-amyl) ketone", "rel_mgm3": "465", "rel_ppm": "TWA 100", "source_quote": "NIOSH REL TWA 100 ppm (465 mg/m3)", "sources": ["https://www.cdc.gov/niosh/npg/npgd0399.html"], "stale_after": "2027-09-08", "substance": "Methyl (n-amyl) ketone", "title": "Methyl (n-amyl) ketone \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Methyl n-amyl ketone\n\n**CAS No.:** 110-43-0\n\n**PEL (ppm):** 100\n\n**PEL (mg/m\u00b3):** 465\n\n> Methyl n-amyl ketone | 110-43-0 | 100 | 465 | - |\n\nSource: \n", "cas_number": "110-43-0", "file": "methyl-n-amyl-ketone.md", "generated": true, "harvested": "2026-08-05", "id": "methyl-n-amyl-ketone", "pel_mgm3": "465", "pel_ppm": "100", "source_quote": "Methyl n-amyl ketone | 110-43-0 | 100 | 465 | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Methyl n-amyl ketone", "title": "Methyl n-amyl ketone \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Methyl n-butyl ketone; 2-hexanone\n\n**CAS No.:** 591786\n\n**PEL (ppm):** 1\n\n**PEL (mg/m\u00b3):** 4\n\n**STEL (ppm):** 10\n\n**STEL (mg/m\u00b3):** 40\n\n> 591786 | S | Methyl n-butyl ketone; 2-hexanone | 1 | 4 | | 10 | 40\n\nSource: \n", "cas_number": "591786", "file": "methyl-n-butyl-ketone-2-hexanone.md", "generated": true, "harvested": "2026-08-05", "id": "methyl-n-butyl-ketone-2-hexanone", "pel_mgm3": "4", "pel_ppm": "1", "source_quote": "591786 | S | Methyl n-butyl ketone; 2-hexanone | 1 | 4 | | 10 | 40", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "stel_mgm3": "40", "stel_ppm": "10", "substance": "Methyl n-butyl ketone; 2-hexanone", "title": "Methyl n-butyl ketone; 2-hexanone \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Methyl parathion; o,o-dimethyl o-(p-nitrophenyl) phosphorothioate\n\n**CAS No.:** 298000\n\n**PEL (mg/m\u00b3):** 0.2\n\n> 298000 | S | Methyl parathion; o,o-dimethyl o-(p-nitrophenyl) phosphorothioate | -- | 0.2\n\nSource: \n", "cas_number": "298000", "file": "methyl-parathion-o-o-dimethyl-o-p-nitrophenyl-phosphorothioate.md", "generated": true, "harvested": "2026-08-05", "id": "methyl-parathion-o-o-dimethyl-o-p-nitrophenyl-phosphorothioate", "pel_mgm3": "0.2", "source_quote": "298000 | S | Methyl parathion; o,o-dimethyl o-(p-nitrophenyl) phosphorothioate | -- | 0.2", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Methyl parathion; o,o-dimethyl o-(p-nitrophenyl) phosphorothioate", "title": "Methyl parathion; o,o-dimethyl o-(p-nitrophenyl) phosphorothioate \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Methyl parathion\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Methyl parathion\n\n**CAS No.:** 298-00-0\n\n> CAS No. 298-00-0\n\n**NIOSH REL (mg/m\u00b3):** TWA 0.2\n\n> NIOSH REL TWA 0.2 mg/m3 [skin]\n\nSource: \n", "cas_number": "298-00-0", "file": "methyl-parathion.md", "generated": true, "harvested": "2026-09-08", "id": "methyl-parathion", "quote_cas_number": "CAS No. 298-00-0", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Methyl parathion", "rel_mgm3": "TWA 0.2", "source_quote": "NIOSH REL TWA 0.2 mg/m3 [skin]", "sources": ["https://www.cdc.gov/niosh/npg/npgd0427.html"], "stale_after": "2027-09-08", "substance": "Methyl parathion", "title": "Methyl parathion \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Methyl propyl ketone; 2-pentanone\n\n**CAS No.:** 107879\n\n**PEL (ppm):** 200\n\n**PEL (mg/m\u00b3):** 700\n\n**STEL (ppm):** 250\n\n**STEL (mg/m\u00b3):** 875\n\n> 107879 | | Methyl propyl ketone; 2-pentanone | 200 | 700 | | 250 | 875\n\nSource: \n", "cas_number": "107879", "file": "methyl-propyl-ketone-2-pentanone.md", "generated": true, "harvested": "2026-08-05", "id": "methyl-propyl-ketone-2-pentanone", "pel_mgm3": "700", "pel_ppm": "200", "source_quote": "107879 | | Methyl propyl ketone; 2-pentanone | 200 | 700 | | 250 | 875", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "stel_mgm3": "875", "stel_ppm": "250", "substance": "Methyl propyl ketone; 2-pentanone", "title": "Methyl propyl ketone; 2-pentanone \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Methyl silicate; tetramethyl silicate\n\n**CAS No.:** 681845\n\n**PEL (ppm):** 1\n\n**PEL (mg/m\u00b3):** 6\n\n> 681845 | | Methyl silicate; tetramethyl silicate | 1 | 6\n\nSource: \n", "cas_number": "681845", "file": "methyl-silicate-tetramethyl-silicate.md", "generated": true, "harvested": "2026-08-05", "id": "methyl-silicate-tetramethyl-silicate", "pel_mgm3": "6", "pel_ppm": "1", "source_quote": "681845 | | Methyl silicate; tetramethyl silicate | 1 | 6", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Methyl silicate; tetramethyl silicate", "title": "Methyl silicate; tetramethyl silicate \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Methyl silicate\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Methyl silicate\n\n**CAS No.:** 681-84-5\n\n> CAS No. 681-84-5\n\n**NIOSH REL (ppm):** TWA 1\n\n**NIOSH REL (mg/m\u00b3):** 6\n\n> NIOSH REL TWA 1 ppm (6 mg/m3)\n\nSource: \n", "cas_number": "681-84-5", "file": "methyl-silicate.md", "generated": true, "harvested": "2026-09-08", "id": "methyl-silicate", "quote_cas_number": "CAS No. 681-84-5", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Methyl silicate", "rel_mgm3": "6", "rel_ppm": "TWA 1", "source_quote": "NIOSH REL TWA 1 ppm (6 mg/m3)", "sources": ["https://www.cdc.gov/niosh/npg/npgd0428.html"], "stale_after": "2027-09-08", "substance": "Methyl silicate", "title": "Methyl silicate \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Methyl sulfate; see Dimethyl sulfate\n\n**CAS No.:** 77781\n\n> 77781 | | Methyl sulfate; see Dimethyl sulfate\n\nSource: \n", "cas_number": "77781", "file": "methyl-sulfate-see-dimethyl-sulfate.md", "generated": true, "harvested": "2026-08-05", "id": "methyl-sulfate-see-dimethyl-sulfate", "source_quote": "77781 | | Methyl sulfate; see Dimethyl sulfate", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Methyl sulfate; see Dimethyl sulfate", "title": "Methyl sulfate; see Dimethyl sulfate \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Methyl tert-butyl ether; MTBE\n\n**CAS No.:** 1634044\n\n**PEL (ppm):** 40\n\n**PEL (mg/m\u00b3):** 144\n\n> 1634044 | | Methyl tert-butyl ether; MTBE | 40 | 144\n\nSource: \n", "cas_number": "1634044", "file": "methyl-tert-butyl-ether-mtbe.md", "generated": true, "harvested": "2026-08-05", "id": "methyl-tert-butyl-ether-mtbe", "pel_mgm3": "144", "pel_ppm": "40", "source_quote": "1634044 | | Methyl tert-butyl ether; MTBE | 40 | 144", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Methyl tert-butyl ether; MTBE", "title": "Methyl tert-butyl ether; MTBE \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Methyl vinyl ketone\n\n**CAS No.:** 78944\n\n**PEL (ppm):** 0.05\n\n**PEL (mg/m\u00b3):** 0.14\n\n**Ceiling:** C\n\n> 78944 | S | Methyl vinyl ketone | 0.05 | 0.14 | C\n\nSource: \n", "cas_number": "78944", "ceiling": "C", "file": "methyl-vinyl-ketone.md", "generated": true, "harvested": "2026-08-05", "id": "methyl-vinyl-ketone", "pel_mgm3": "0.14", "pel_ppm": "0.05", "source_quote": "78944 | S | Methyl vinyl ketone | 0.05 | 0.14 | C", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Methyl vinyl ketone", "title": "Methyl vinyl ketone \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Methylacrylonitrile\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Methylacrylonitrile\n\n**CAS No.:** 126-98-7\n\n> CAS No. 126-98-7\n\n**NIOSH REL (ppm):** TWA 1\n\n**NIOSH REL (mg/m\u00b3):** 3\n\n> NIOSH REL TWA 1 ppm (3 mg/m\u00b3) [skin]\n\nSource: \n", "cas_number": "126-98-7", "file": "methylacrylonitrile.md", "generated": true, "harvested": "2026-09-08", "id": "methylacrylonitrile", "quote_cas_number": "CAS No. 126-98-7", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Methylacrylonitrile", "rel_mgm3": "3", "rel_ppm": "TWA 1", "source_quote": "NIOSH REL TWA 1 ppm (3 mg/m\u00b3) [skin]", "sources": ["https://www.cdc.gov/niosh/npg/npgd0395.html"], "stale_after": "2027-09-08", "substance": "Methylacrylonitrile", "title": "Methylacrylonitrile \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Methylal (Dimethoxy-methane)\n\n**CAS No.:** 109-87-5\n\n**PEL (ppm):** 1000\n\n**PEL (mg/m\u00b3):** 3100\n\n> Methylal (Dimethoxy-methane) | 109-87-5 | 1000 | 3100 | - |\n\nSource: \n", "cas_number": "109-87-5", "file": "methylal-dimethoxy-methane.md", "generated": true, "harvested": "2026-08-05", "id": "methylal-dimethoxy-methane", "pel_mgm3": "3100", "pel_ppm": "1000", "source_quote": "Methylal (Dimethoxy-methane) | 109-87-5 | 1000 | 3100 | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Methylal (Dimethoxy-methane)", "title": "Methylal (Dimethoxy-methane) \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Methylal; dimethoxymethane\n\n**CAS No.:** 109875\n\n**PEL (ppm):** 1,000\n\n**PEL (mg/m\u00b3):** 3,100\n\n> 109875 | | Methylal; dimethoxymethane | 1,000 | 3,100\n\nSource: \n", "cas_number": "109875", "file": "methylal-dimethoxymethane.md", "generated": true, "harvested": "2026-08-05", "id": "methylal-dimethoxymethane", "pel_mgm3": "3,100", "pel_ppm": "1,000", "source_quote": "109875 | | Methylal; dimethoxymethane | 1,000 | 3,100", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Methylal; dimethoxymethane", "title": "Methylal; dimethoxymethane \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Methylal\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Methylal\n\n**CAS No.:** 109-87-5\n\n> CAS No. 109-87-5\n\n**NIOSH REL (ppm):** TWA 1000\n\n**NIOSH REL (mg/m\u00b3):** 3100\n\n> NIOSH REL TWA 1000 ppm (3100 mg/m3)\n\nSource: \n", "cas_number": "109-87-5", "file": "methylal.md", "generated": true, "harvested": "2026-09-08", "id": "methylal", "quote_cas_number": "CAS No. 109-87-5", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Methylal", "rel_mgm3": "3100", "rel_ppm": "TWA 1000", "source_quote": "NIOSH REL TWA 1000 ppm (3100 mg/m3)", "sources": ["https://www.cdc.gov/niosh/npg/npgd0396.html"], "stale_after": "2027-09-08", "substance": "Methylal", "title": "Methylal \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Methylamine\n\n**CAS No.:** 74895\n\n**PEL (ppm):** 5\n\n**PEL (mg/m\u00b3):** 6.4\n\n**STEL (ppm):** 15\n\n**STEL (mg/m\u00b3):** 19\n\n> 74895 | | Methylamine | 5 | 6.4 | | 15 | 19\n\nSource: \n", "cas_number": "74895", "file": "methylamine-2.md", "generated": true, "harvested": "2026-08-05", "id": "methylamine-2", "pel_mgm3": "6.4", "pel_ppm": "5", "source_quote": "74895 | | Methylamine | 5 | 6.4 | | 15 | 19", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "stel_mgm3": "19", "stel_ppm": "15", "substance": "Methylamine", "title": "Methylamine \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Methylamine\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Methylamine\n\n**CAS No.:** 74-89-5\n\n> CAS No. 74-89-5\n\n**NIOSH REL (ppm):** TWA 10\n\n**NIOSH REL (mg/m\u00b3):** 12\n\n> NIOSH REL TWA 10 ppm (12 mg/m3)\n\nSource: \n", "cas_number": "74-89-5", "file": "methylamine-3.md", "generated": true, "harvested": "2026-09-08", "id": "methylamine-3", "quote_cas_number": "CAS No. 74-89-5", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Methylamine", "rel_mgm3": "12", "rel_ppm": "TWA 10", "source_quote": "NIOSH REL TWA 10 ppm (12 mg/m3)", "sources": ["https://www.cdc.gov/niosh/npg/npgd0398.html"], "stale_after": "2027-09-08", "substance": "Methylamine", "title": "Methylamine \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Methylamine\n\n**CAS No.:** 74-89-5\n\n**PEL (ppm):** 10\n\n**PEL (mg/m\u00b3):** 12\n\n> Methylamine | 74-89-5 | 10 | 12 | - |\n\nSource: \n", "cas_number": "74-89-5", "file": "methylamine.md", "generated": true, "harvested": "2026-08-05", "id": "methylamine", "pel_mgm3": "12", "pel_ppm": "10", "source_quote": "Methylamine | 74-89-5 | 10 | 12 | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Methylamine", "title": "Methylamine \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Methylcyclohexane\n\n**CAS No.:** 108872\n\n**PEL (ppm):** 400\n\n**PEL (mg/m\u00b3):** 1,600\n\n> 108872 | | Methylcyclohexane | 400 | 1,600\n\nSource: \n", "cas_number": "108872", "file": "methylcyclohexane-2.md", "generated": true, "harvested": "2026-08-05", "id": "methylcyclohexane-2", "pel_mgm3": "1,600", "pel_ppm": "400", "source_quote": "108872 | | Methylcyclohexane | 400 | 1,600", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Methylcyclohexane", "title": "Methylcyclohexane \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Methylcyclohexane\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Methylcyclohexane\n\n**CAS No.:** 108-87-2\n\n> CAS No. 108-87-2\n\n**NIOSH REL (ppm):** TWA 400\n\n**NIOSH REL (mg/m\u00b3):** 1600\n\n> NIOSH REL TWA 400 ppm (1600 mg/m3)\n\nSource: \n", "cas_number": "108-87-2", "file": "methylcyclohexane-3.md", "generated": true, "harvested": "2026-09-08", "id": "methylcyclohexane-3", "quote_cas_number": "CAS No. 108-87-2", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Methylcyclohexane", "rel_mgm3": "1600", "rel_ppm": "TWA 400", "source_quote": "NIOSH REL TWA 400 ppm (1600 mg/m3)", "sources": ["https://www.cdc.gov/niosh/npg/npgd0406.html"], "stale_after": "2027-09-08", "substance": "Methylcyclohexane", "title": "Methylcyclohexane \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Methylcyclohexane\n\n**CAS No.:** 108-87-2\n\n**PEL (ppm):** 500\n\n**PEL (mg/m\u00b3):** 2000\n\n> Methylcyclohexane | 108-87-2 | 500 | 2000 | - |\n\nSource: \n", "cas_number": "108-87-2", "file": "methylcyclohexane.md", "generated": true, "harvested": "2026-08-05", "id": "methylcyclohexane", "pel_mgm3": "2000", "pel_ppm": "500", "source_quote": "Methylcyclohexane | 108-87-2 | 500 | 2000 | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Methylcyclohexane", "title": "Methylcyclohexane \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Methylcyclohexanol\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Methylcyclohexanol\n\n**CAS No.:** 25639-42-3\n\n> CAS No. 25639-42-3\n\n**NIOSH REL (ppm):** TWA 50\n\n**NIOSH REL (mg/m\u00b3):** 235\n\n> NIOSH REL TWA 50 ppm (235 mg/m3)\n\nSource: \n", "cas_number": "25639-42-3", "file": "methylcyclohexanol-2.md", "generated": true, "harvested": "2026-09-08", "id": "methylcyclohexanol-2", "quote_cas_number": "CAS No. 25639-42-3", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Methylcyclohexanol", "rel_mgm3": "235", "rel_ppm": "TWA 50", "source_quote": "NIOSH REL TWA 50 ppm (235 mg/m3)", "sources": ["https://www.cdc.gov/niosh/npg/npgd0407.html"], "stale_after": "2027-09-08", "substance": "Methylcyclohexanol", "title": "Methylcyclohexanol \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Methylcyclohexanol (meta- and para-isomer mixture)\n\n**CAS No.:** 25639423\n\n**PEL (ppm):** 50\n\n**PEL (mg/m\u00b3):** 235\n\n> 25639423 | | Methylcyclohexanol (meta- and para-isomer mixture) | 50 | 235\n\nSource: \n", "cas_number": "25639423", "file": "methylcyclohexanol-meta-and-para-isomer-mixture.md", "generated": true, "harvested": "2026-08-05", "id": "methylcyclohexanol-meta-and-para-isomer-mixture", "pel_mgm3": "235", "pel_ppm": "50", "source_quote": "25639423 | | Methylcyclohexanol (meta- and para-isomer mixture) | 50 | 235", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Methylcyclohexanol (meta- and para-isomer mixture)", "title": "Methylcyclohexanol (meta- and para-isomer mixture) \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Methylcyclohexanol\n\n**CAS No.:** 25639-42-3\n\n**PEL (ppm):** 100\n\n**PEL (mg/m\u00b3):** 470\n\n> Methylcyclohexanol | 25639-42-3 | 100 | 470 | - |\n\nSource: \n", "cas_number": "25639-42-3", "file": "methylcyclohexanol.md", "generated": true, "harvested": "2026-08-05", "id": "methylcyclohexanol", "pel_mgm3": "470", "pel_ppm": "100", "source_quote": "Methylcyclohexanol | 25639-42-3 | 100 | 470 | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Methylcyclohexanol", "title": "Methylcyclohexanol \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Methylene bis(4-cyclohexylisocyanate); hydrogenated MDI\n\n**CAS No.:** 5124301\n\n**PEL (ppm):** 0.005\n\n**PEL (mg/m\u00b3):** 0.054\n\n> 5124301 | | Methylene bis(4-cyclohexylisocyanate); hydrogenated MDI | 0.005 | 0.054\n\nSource: \n", "cas_number": "5124301", "file": "methylene-bis-4-cyclohexylisocyanate-hydrogenated-mdi.md", "generated": true, "harvested": "2026-08-05", "id": "methylene-bis-4-cyclohexylisocyanate-hydrogenated-mdi", "pel_mgm3": "0.054", "pel_ppm": "0.005", "source_quote": "5124301 | | Methylene bis(4-cyclohexylisocyanate); hydrogenated MDI | 0.005 | 0.054", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Methylene bis(4-cyclohexylisocyanate); hydrogenated MDI", "title": "Methylene bis(4-cyclohexylisocyanate); hydrogenated MDI \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Methylene bis(4-cyclohexylisocyanate)\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Methylene bis(4-cyclohexylisocyanate)\n\n**CAS No.:** 5124-30-1\n\n> CAS No. 5124-30-1\n\n**NIOSH REL (ppm):** C 0.01\n\n**NIOSH REL (mg/m\u00b3):** 0.11\n\n> NIOSH REL C 0.01 ppm (0.11 mg/m3)\n\nSource: \n", "cas_number": "5124-30-1", "file": "methylene-bis-4-cyclohexylisocyanate.md", "generated": true, "harvested": "2026-09-08", "id": "methylene-bis-4-cyclohexylisocyanate", "quote_cas_number": "CAS No. 5124-30-1", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Methylene bis(4-cyclohexylisocyanate)", "rel_mgm3": "0.11", "rel_ppm": "C 0.01", "source_quote": "NIOSH REL C 0.01 ppm (0.11 mg/m3)", "sources": ["https://www.cdc.gov/niosh/npg/npgd0412.html"], "stale_after": "2027-09-08", "substance": "Methylene bis(4-cyclohexylisocyanate)", "title": "Methylene bis(4-cyclohexylisocyanate) \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Methylene bis(phenylisocyanate); MDI; diphenylmethane diisocyanate\n\n**CAS No.:** 101688\n\n**PEL (ppm):** 0.005\n\n**PEL (mg/m\u00b3):** 0.051\n\n> 101688 | | Methylene bis(phenylisocyanate); MDI; diphenylmethane diisocyanate | 0.005 | 0.051\n\nSource: \n", "cas_number": "101688", "file": "methylene-bis-phenylisocyanate-mdi-diphenylmethane-diisocyanate.md", "generated": true, "harvested": "2026-08-05", "id": "methylene-bis-phenylisocyanate-mdi-diphenylmethane-diisocyanate", "pel_mgm3": "0.051", "pel_ppm": "0.005", "source_quote": "101688 | | Methylene bis(phenylisocyanate); MDI; diphenylmethane diisocyanate | 0.005 | 0.051", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Methylene bis(phenylisocyanate); MDI; diphenylmethane diisocyanate", "title": "Methylene bis(phenylisocyanate); MDI; diphenylmethane diisocyanate \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Methylene bisphenyl isocyanate (MDI)\n\n**CAS No.:** 101-68-8\n\n**PEL (ppm):** (C)0.02\n\n**PEL (mg/m\u00b3):** (C)0.2\n\n> Methylene bisphenyl isocyanate (MDI) | 101-68-8 | (C)0.02 | (C)0.2 | - |\n\nSource: \n", "cas_number": "101-68-8", "file": "methylene-bisphenyl-isocyanate-mdi.md", "generated": true, "harvested": "2026-08-05", "id": "methylene-bisphenyl-isocyanate-mdi", "pel_mgm3": "(C)0.2", "pel_ppm": "(C)0.02", "source_quote": "Methylene bisphenyl isocyanate (MDI) | 101-68-8 | (C)0.02 | (C)0.2 | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Methylene bisphenyl isocyanate (MDI)", "title": "Methylene bisphenyl isocyanate (MDI) \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Methylene bisphenyl isocyanate\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Methylene bisphenyl isocyanate\n\n**CAS No.:** 101-68-8\n\n> CAS No. 101-68-8\n\n**NIOSH REL (ppm):** 0.005\n\n**NIOSH REL (mg/m\u00b3):** TWA 0.05\n\n> NIOSH REL TWA 0.05 mg/m3 (0.005 ppm) C 0.2 mg/m3 (0.020 ppm) [10-minute]\n\nSource: \n", "cas_number": "101-68-8", "file": "methylene-bisphenyl-isocyanate.md", "generated": true, "harvested": "2026-09-08", "id": "methylene-bisphenyl-isocyanate", "quote_cas_number": "CAS No. 101-68-8", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Methylene bisphenyl isocyanate", "rel_mgm3": "TWA 0.05", "rel_ppm": "0.005", "source_quote": "NIOSH REL TWA 0.05 mg/m3 (0.005 ppm) C 0.2 mg/m3 (0.020 ppm) [10-minute]", "sources": ["https://www.cdc.gov/niosh/npg/npgd0413.html"], "stale_after": "2027-09-08", "substance": "Methylene bisphenyl isocyanate", "title": "Methylene bisphenyl isocyanate \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Methylene chloride\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Methylene chloride\n\n**CAS No.:** 75-09-2\n\n> CAS No. 75-09-2\n\n**NIOSH REL, as stated:** Ca See Appendix A\n\n> NIOSH REL Ca See Appendix A\n\nSource: \n", "cas_number": "75-09-2", "file": "methylene-chloride-2.md", "generated": true, "harvested": "2026-09-08", "id": "methylene-chloride-2", "quote_cas_number": "CAS No. 75-09-2", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Methylene chloride", "rel_statement": "Ca See Appendix A", "source_quote": "NIOSH REL Ca See Appendix A", "sources": ["https://www.cdc.gov/niosh/npg/npgd0414.html"], "stale_after": "2027-09-08", "substance": "Methylene chloride", "title": "Methylene chloride \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Methylene chloride; dichloromethane (see also section 5202)\n\n**CAS No.:** 75092\n\n**PEL (ppm):** 25\n\n**PEL (mg/m\u00b3):** 87\n\n**STEL (ppm):** 125\n\n**STEL (mg/m\u00b3):** 435\n\n> 75092 | | Methylene chloride; dichloromethane (see also section 5202) | 25 | 87 | | 125 | 435\n\nSource: \n", "cas_number": "75092", "file": "methylene-chloride-dichloromethane-see-also-section-5202.md", "generated": true, "harvested": "2026-08-05", "id": "methylene-chloride-dichloromethane-see-also-section-5202", "pel_mgm3": "87", "pel_ppm": "25", "source_quote": "75092 | | Methylene chloride; dichloromethane (see also section 5202) | 25 | 87 | | 125 | 435", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "stel_mgm3": "435", "stel_ppm": "125", "substance": "Methylene chloride; dichloromethane (see also section 5202)", "title": "Methylene chloride; dichloromethane (see also section 5202) \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Methylene chloride\n\n**CAS No.:** 75-09-2\n\n> Methylene chloride | 75-09-2 | - | (2) | - |\n\nSource: \n", "cas_number": "75-09-2", "file": "methylene-chloride.md", "generated": true, "harvested": "2026-08-05", "id": "methylene-chloride", "source_quote": "Methylene chloride | 75-09-2 | - | (2) | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Methylene chloride", "title": "Methylene chloride \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Metribuzin\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Metribuzin\n\n**CAS No.:** 21087-64-9\n\n> CAS No. 21087-64-9\n\n**NIOSH REL (mg/m\u00b3):** TWA 5\n\n> NIOSH REL TWA 5 mg/m3\n\nSource: \n", "cas_number": "21087-64-9", "file": "metribuzin-2.md", "generated": true, "harvested": "2026-09-08", "id": "metribuzin-2", "quote_cas_number": "CAS No. 21087-64-9", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Metribuzin", "rel_mgm3": "TWA 5", "source_quote": "NIOSH REL TWA 5 mg/m3", "sources": ["https://www.cdc.gov/niosh/npg/npgd0430.html"], "stale_after": "2027-09-08", "substance": "Metribuzin", "title": "Metribuzin \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Metribuzin\n\n**CAS No.:** 21087649\n\n**PEL (mg/m\u00b3):** 5\n\n> 21087649 | | Metribuzin | -- | 5\n\nSource: \n", "cas_number": "21087649", "file": "metribuzin.md", "generated": true, "harvested": "2026-08-05", "id": "metribuzin", "pel_mgm3": "5", "source_quote": "21087649 | | Metribuzin | -- | 5", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Metribuzin", "title": "Metribuzin \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Mevinphos; 2-carbomethoxyl-1-propen-2-yl dimethyl phosphate\n\n**CAS No.:** 7786347\n\n**PEL (ppm):** 0.01\n\n**PEL (mg/m\u00b3):** 0.1\n\n**STEL (ppm):** 0.03\n\n**STEL (mg/m\u00b3):** 0.3\n\n> 7786347 | S | Mevinphos; 2-carbomethoxyl-1-propen-2-yl dimethyl phosphate | 0.01 | 0.1 | | 0.03 | 0.3\n\nSource: \n", "cas_number": "7786347", "file": "mevinphos-2-carbomethoxyl-1-propen-2-yl-dimethyl-phosphate.md", "generated": true, "harvested": "2026-08-05", "id": "mevinphos-2-carbomethoxyl-1-propen-2-yl-dimethyl-phosphate", "pel_mgm3": "0.1", "pel_ppm": "0.01", "source_quote": "7786347 | S | Mevinphos; 2-carbomethoxyl-1-propen-2-yl dimethyl phosphate | 0.01 | 0.1 | | 0.03 | 0.3", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "stel_mgm3": "0.3", "stel_ppm": "0.03", "substance": "Mevinphos; 2-carbomethoxyl-1-propen-2-yl dimethyl phosphate", "title": "Mevinphos; 2-carbomethoxyl-1-propen-2-yl dimethyl phosphate \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Mica (containing less than 1% quartz)\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Mica (containing less than 1% quartz)\n\n**CAS No.:** 12001-26-2\n\n> CAS No. 12001-26-2\n\n**NIOSH REL, as stated:** TWA 3 mg/m3 (resp)\n\n> NIOSH REL TWA 3 mg/m3 (resp)\n\nSource: \n", "cas_number": "12001-26-2", "file": "mica-containing-less-than-1-quartz.md", "generated": true, "harvested": "2026-09-08", "id": "mica-containing-less-than-1-quartz", "quote_cas_number": "CAS No. 12001-26-2", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Mica (containing less than 1% quartz)", "rel_statement": "TWA 3 mg/m3 (resp)", "source_quote": "NIOSH REL TWA 3 mg/m3 (resp)", "sources": ["https://www.cdc.gov/niosh/npg/npgd0431.html"], "stale_after": "2027-09-08", "substance": "Mica (containing less than 1% quartz)", "title": "Mica (containing less than 1% quartz) \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Mica (respirable dust)\n\n**CAS No.:** 12001262\n\n**PEL (mg/m\u00b3):** 3\n\n> 12001262 | | Mica (respirable dust) | -- | 3\n\nSource: \n", "cas_number": "12001262", "file": "mica-respirable-dust-2.md", "generated": true, "harvested": "2026-08-05", "id": "mica-respirable-dust-2", "pel_mgm3": "3", "source_quote": "12001262 | | Mica (respirable dust) | -- | 3", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Mica (respirable dust)", "title": "Mica (respirable dust) \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Mica (respirable dust)\n\n**CAS No.:** 12001-26-2\n\n> Mica (respirable dust) | 12001-26-2 | - | (3) | - |\n\nSource: \n", "cas_number": "12001-26-2", "file": "mica-respirable-dust.md", "generated": true, "harvested": "2026-08-05", "id": "mica-respirable-dust", "source_quote": "Mica (respirable dust) | 12001-26-2 | - | (3) | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Mica (respirable dust)", "title": "Mica (respirable dust) \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Molybdenum (as Mo)\n\n**CAS No.:** 7439-98-7\n\n> Molybdenum (as Mo) | 7439-98-7 | - | - | - |\n\nSource: \n", "cas_number": "7439-98-7", "file": "molybdenum-as-mo.md", "generated": true, "harvested": "2026-08-05", "id": "molybdenum-as-mo", "source_quote": "Molybdenum (as Mo) | 7439-98-7 | - | - | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Molybdenum (as Mo)", "title": "Molybdenum (as Mo) \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Molybdenum, insoluble compounds, as Mo\n\n**CAS No.:** 7439987\n\n**PEL (mg/m\u00b3):** 0.5(n)\n\n> 7439987 | | Molybdenum, insoluble compounds, as Mo | -- | 0.5(n)\n\nSource: \n", "cas_number": "7439987", "file": "molybdenum-insoluble-compounds-as-mo.md", "generated": true, "harvested": "2026-08-05", "id": "molybdenum-insoluble-compounds-as-mo", "pel_mgm3": "0.5(n)", "source_quote": "7439987 | | Molybdenum, insoluble compounds, as Mo | -- | 0.5(n)", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Molybdenum, insoluble compounds, as Mo", "title": "Molybdenum, insoluble compounds, as Mo \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Molybdenum\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Molybdenum\n\n**CAS No.:** 7439-98-7\n\n> CAS No. 7439-98-7\n\n**NIOSH REL, as stated:** See Appendix D\n\n> NIOSH REL See Appendix D\n\nSource: \n", "cas_number": "7439-98-7", "file": "molybdenum.md", "generated": true, "harvested": "2026-09-08", "id": "molybdenum", "quote_cas_number": "CAS No. 7439-98-7", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Molybdenum", "rel_statement": "See Appendix D", "source_quote": "NIOSH REL See Appendix D", "sources": ["https://www.cdc.gov/niosh/npg/npgd0433.html"], "stale_after": "2027-09-08", "substance": "Molybdenum", "title": "Molybdenum \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Monocrotophos\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Monocrotophos\n\n**CAS No.:** 6923-22-4\n\n> CAS No. 6923-22-4\n\n**NIOSH REL (mg/m\u00b3):** TWA 0.25\n\n> NIOSH REL TWA 0.25 mg/m3\n\nSource: \n", "cas_number": "6923-22-4", "file": "monocrotophos-2.md", "generated": true, "harvested": "2026-09-08", "id": "monocrotophos-2", "quote_cas_number": "CAS No. 6923-22-4", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Monocrotophos", "rel_mgm3": "TWA 0.25", "source_quote": "NIOSH REL TWA 0.25 mg/m3", "sources": ["https://www.cdc.gov/niosh/npg/npgd0435.html"], "stale_after": "2027-09-08", "substance": "Monocrotophos", "title": "Monocrotophos \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Monocrotophos\n\n**CAS No.:** 6923224\n\n**PEL (mg/m\u00b3):** 0.25\n\n> 6923224 | | Monocrotophos | -- | 0.25\n\nSource: \n", "cas_number": "6923224", "file": "monocrotophos.md", "generated": true, "harvested": "2026-08-05", "id": "monocrotophos", "pel_mgm3": "0.25", "source_quote": "6923224 | | Monocrotophos | -- | 0.25", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Monocrotophos", "title": "Monocrotophos \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Monomethyl aniline\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Monomethyl aniline\n\n**CAS No.:** 100-61-8\n\n> CAS No. 100-61-8\n\n**NIOSH REL (ppm):** TWA 0.5\n\n**NIOSH REL (mg/m\u00b3):** 2\n\n> NIOSH REL TWA 0.5 ppm (2 mg/m3) [skin]\n\nSource: \n", "cas_number": "100-61-8", "file": "monomethyl-aniline-2.md", "generated": true, "harvested": "2026-09-08", "id": "monomethyl-aniline-2", "quote_cas_number": "CAS No. 100-61-8", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Monomethyl aniline", "rel_mgm3": "2", "rel_ppm": "TWA 0.5", "source_quote": "NIOSH REL TWA 0.5 ppm (2 mg/m3) [skin]", "sources": ["https://www.cdc.gov/niosh/npg/npgd0436.html"], "stale_after": "2027-09-08", "substance": "Monomethyl aniline", "title": "Monomethyl aniline \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Monomethyl aniline\n\n**CAS No.:** 100-61-8\n\n**PEL (ppm):** 2\n\n**PEL (mg/m\u00b3):** 9\n\n> Monomethyl aniline | 100-61-8 | 2 | 9 | X |\n\nSource: \n", "cas_number": "100-61-8", "file": "monomethyl-aniline.md", "generated": true, "harvested": "2026-08-05", "id": "monomethyl-aniline", "pel_mgm3": "9", "pel_ppm": "2", "source_quote": "Monomethyl aniline | 100-61-8 | 2 | 9 | X |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Monomethyl aniline", "title": "Monomethyl aniline \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Monomethylaniline; see N-Methylaniline\n\n**CAS No.:** 100618\n\n> 100618 | | Monomethylaniline; see N-Methylaniline\n\nSource: \n", "cas_number": "100618", "file": "monomethylaniline-see-n-methylaniline.md", "generated": true, "harvested": "2026-08-05", "id": "monomethylaniline-see-n-methylaniline", "source_quote": "100618 | | Monomethylaniline; see N-Methylaniline", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Monomethylaniline; see N-Methylaniline", "title": "Monomethylaniline; see N-Methylaniline \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Monomethylhydrazine; see Methyl hydrazine\n\n**CAS No.:** 60344\n\n> 60344 | | Monomethylhydrazine; see Methyl hydrazine\n\nSource: \n", "cas_number": "60344", "file": "monomethylhydrazine-see-methyl-hydrazine.md", "generated": true, "harvested": "2026-08-05", "id": "monomethylhydrazine-see-methyl-hydrazine", "source_quote": "60344 | | Monomethylhydrazine; see Methyl hydrazine", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Monomethylhydrazine; see Methyl hydrazine", "title": "Monomethylhydrazine; see Methyl hydrazine \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Morpholine\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Morpholine\n\n**CAS No.:** 110-91-8\n\n> CAS No. 110-91-8\n\n**NIOSH REL (ppm):** TWA 20\n\n**NIOSH REL (mg/m\u00b3):** 70\n\n> NIOSH REL TWA 20 ppm (70 mg/m3) ST 30 ppm (105 mg/m3) [skin]\n\nSource: \n", "cas_number": "110-91-8", "file": "morpholine-2.md", "generated": true, "harvested": "2026-09-08", "id": "morpholine-2", "quote_cas_number": "CAS No. 110-91-8", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Morpholine", "rel_mgm3": "70", "rel_ppm": "TWA 20", "source_quote": "NIOSH REL TWA 20 ppm (70 mg/m3) ST 30 ppm (105 mg/m3) [skin]", "sources": ["https://www.cdc.gov/niosh/npg/npgd0437.html"], "stale_after": "2027-09-08", "substance": "Morpholine", "title": "Morpholine \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Morpholine; tetrahydro-4H-1, 4-oxazine\n\n**CAS No.:** 110918\n\n**PEL (ppm):** 20\n\n**PEL (mg/m\u00b3):** 70\n\n**STEL (ppm):** 30\n\n**STEL (mg/m\u00b3):** 105\n\n> 110918 | S | Morpholine; tetrahydro-4H-1, 4-oxazine | 20 | 70 | | 30 | 105\n\nSource: \n", "cas_number": "110918", "file": "morpholine-tetrahydro-4h-1-4-oxazine.md", "generated": true, "harvested": "2026-08-05", "id": "morpholine-tetrahydro-4h-1-4-oxazine", "pel_mgm3": "70", "pel_ppm": "20", "source_quote": "110918 | S | Morpholine; tetrahydro-4H-1, 4-oxazine | 20 | 70 | | 30 | 105", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "stel_mgm3": "105", "stel_ppm": "30", "substance": "Morpholine; tetrahydro-4H-1, 4-oxazine", "title": "Morpholine; tetrahydro-4H-1, 4-oxazine \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Morpholine\n\n**CAS No.:** 110-91-8\n\n**PEL (ppm):** 20\n\n**PEL (mg/m\u00b3):** 70\n\n> Morpholine | 110-91-8 | 20 | 70 | X |\n\nSource: \n", "cas_number": "110-91-8", "file": "morpholine.md", "generated": true, "harvested": "2026-08-05", "id": "morpholine", "pel_mgm3": "70", "pel_ppm": "20", "source_quote": "Morpholine | 110-91-8 | 20 | 70 | X |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Morpholine", "title": "Morpholine \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Muriatic acid; see Hydrogen chloride\n\n**CAS No.:** 7647010\n\n> 7647010 | | Muriatic acid; see Hydrogen chloride\n\nSource: \n", "cas_number": "7647010", "file": "muriatic-acid-see-hydrogen-chloride.md", "generated": true, "harvested": "2026-08-05", "id": "muriatic-acid-see-hydrogen-chloride", "source_quote": "7647010 | | Muriatic acid; see Hydrogen chloride", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Muriatic acid; see Hydrogen chloride", "title": "Muriatic acid; see Hydrogen chloride \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** n-Amyl acetate\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - n-Amyl acetate\n\n**CAS No.:** 628-63-7\n\n> CAS No. 628-63-7\n\n**NIOSH REL (ppm):** TWA 100\n\n**NIOSH REL (mg/m\u00b3):** 525\n\n> NIOSH REL TWA 100 ppm (525 mg/m3)\n\nSource: \n", "cas_number": "628-63-7", "file": "n-amyl-acetate-2.md", "generated": true, "harvested": "2026-09-08", "id": "n-amyl-acetate-2", "quote_cas_number": "CAS No. 628-63-7", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - n-Amyl acetate", "rel_mgm3": "525", "rel_ppm": "TWA 100", "source_quote": "NIOSH REL TWA 100 ppm (525 mg/m3)", "sources": ["https://www.cdc.gov/niosh/npg/npgd0031.html"], "stale_after": "2027-09-08", "substance": "n-Amyl acetate", "title": "n-Amyl acetate \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** n-Amyl acetate; see Pentyl acetate\n\n**CAS No.:** 628637\n\n> 628637 | | n-Amyl acetate; see Pentyl acetate\n\nSource: \n", "cas_number": "628637", "file": "n-amyl-acetate-see-pentyl-acetate.md", "generated": true, "harvested": "2026-08-05", "id": "n-amyl-acetate-see-pentyl-acetate", "source_quote": "628637 | | n-Amyl acetate; see Pentyl acetate", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "n-Amyl acetate; see Pentyl acetate", "title": "n-Amyl acetate; see Pentyl acetate \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** n-Amyl acetate\n\n**CAS No.:** 628-63-7\n\n**PEL (ppm):** 100\n\n**PEL (mg/m\u00b3):** 525\n\n> n-Amyl acetate | 628-63-7 | 100 | 525 | - |\n\nSource: \n", "cas_number": "628-63-7", "file": "n-amyl-acetate.md", "generated": true, "harvested": "2026-08-05", "id": "n-amyl-acetate", "pel_mgm3": "525", "pel_ppm": "100", "source_quote": "n-Amyl acetate | 628-63-7 | 100 | 525 | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "n-Amyl acetate", "title": "n-Amyl acetate \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** n-Butane\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - n-Butane\n\n**CAS No.:** 106-97-8\n\n> CAS No. 106-97-8\n\n**NIOSH REL (ppm):** TWA 800\n\n**NIOSH REL (mg/m\u00b3):** 1900\n\n> NIOSH REL TWA 800 ppm (1900 mg/m\u00b3)\n\nSource: \n", "cas_number": "106-97-8", "file": "n-butane.md", "generated": true, "harvested": "2026-09-08", "id": "n-butane", "quote_cas_number": "CAS No. 106-97-8", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - n-Butane", "rel_mgm3": "1900", "rel_ppm": "TWA 800", "source_quote": "NIOSH REL TWA 800 ppm (1900 mg/m\u00b3)", "sources": ["https://www.cdc.gov/niosh/npg/npgd0068.html"], "stale_after": "2027-09-08", "substance": "n-Butane", "title": "n-Butane \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** n-Butyl acetate\n\n**CAS No.:** 123864\n\n**PEL (ppm):** 150\n\n**PEL (mg/m\u00b3):** 710\n\n**STEL (ppm):** 200\n\n**STEL (mg/m\u00b3):** 950\n\n> 123864 | | n-Butyl acetate | 150 | 710 | | 200 | 950\n\nSource: \n", "cas_number": "123864", "file": "n-butyl-acetate-2.md", "generated": true, "harvested": "2026-08-05", "id": "n-butyl-acetate-2", "pel_mgm3": "710", "pel_ppm": "150", "source_quote": "123864 | | n-Butyl acetate | 150 | 710 | | 200 | 950", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "stel_mgm3": "950", "stel_ppm": "200", "substance": "n-Butyl acetate", "title": "n-Butyl acetate \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** n-Butyl acetate\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - n-Butyl acetate\n\n**CAS No.:** 123-86-4\n\n> CAS No. 123-86-4\n\n**NIOSH REL (ppm):** TWA 150\n\n**NIOSH REL (mg/m\u00b3):** 710\n\n> NIOSH REL TWA 150 ppm (710 mg/m3) ST 200 ppm (950 mg/m3)\n\nSource: \n", "cas_number": "123-86-4", "file": "n-butyl-acetate-3.md", "generated": true, "harvested": "2026-09-08", "id": "n-butyl-acetate-3", "quote_cas_number": "CAS No. 123-86-4", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - n-Butyl acetate", "rel_mgm3": "710", "rel_ppm": "TWA 150", "source_quote": "NIOSH REL TWA 150 ppm (710 mg/m3) ST 200 ppm (950 mg/m3)", "sources": ["https://www.cdc.gov/niosh/npg/npgd0072.html"], "stale_after": "2027-09-08", "substance": "n-Butyl acetate", "title": "n-Butyl acetate \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** n-Butyl-acetate\n\n**CAS No.:** 123-86-4\n\n**PEL (ppm):** 150\n\n**PEL (mg/m\u00b3):** 710\n\n> n-Butyl-acetate | 123-86-4 | 150 | 710 | - |\n\nSource: \n", "cas_number": "123-86-4", "file": "n-butyl-acetate.md", "generated": true, "harvested": "2026-08-05", "id": "n-butyl-acetate", "pel_mgm3": "710", "pel_ppm": "150", "source_quote": "n-Butyl-acetate | 123-86-4 | 150 | 710 | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "n-Butyl-acetate", "title": "n-Butyl-acetate \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** n-Butyl alcohol; 1-butanol\n\n**CAS No.:** 71363\n\n**PEL (ppm):** 50\n\n**PEL (mg/m\u00b3):** 150\n\n**Ceiling:** C\n\n> 71363 | S | n-Butyl alcohol; 1-butanol | 50 | 150 | C\n\nSource: \n", "cas_number": "71363", "ceiling": "C", "file": "n-butyl-alcohol-1-butanol.md", "generated": true, "harvested": "2026-08-05", "id": "n-butyl-alcohol-1-butanol", "pel_mgm3": "150", "pel_ppm": "50", "source_quote": "71363 | S | n-Butyl alcohol; 1-butanol | 50 | 150 | C", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "n-Butyl alcohol; 1-butanol", "title": "n-Butyl alcohol; 1-butanol \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** n-Butyl alcohol\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - n-Butyl alcohol\n\n**CAS No.:** 71-36-3\n\n> CAS No. 71-36-3\n\n**NIOSH REL (ppm):** C 50\n\n**NIOSH REL (mg/m\u00b3):** 150\n\n> NIOSH REL C 50 ppm (150 mg/m3) [skin]\n\nSource: \n", "cas_number": "71-36-3", "file": "n-butyl-alcohol-2.md", "generated": true, "harvested": "2026-09-08", "id": "n-butyl-alcohol-2", "quote_cas_number": "CAS No. 71-36-3", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - n-Butyl alcohol", "rel_mgm3": "150", "rel_ppm": "C 50", "source_quote": "NIOSH REL C 50 ppm (150 mg/m3) [skin]", "sources": ["https://www.cdc.gov/niosh/npg/npgd0076.html"], "stale_after": "2027-09-08", "substance": "n-Butyl alcohol", "title": "n-Butyl alcohol \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** n-Butyl alcohol\n\n**CAS No.:** 71-36-3\n\n**PEL (ppm):** 100\n\n**PEL (mg/m\u00b3):** 300\n\n> n-Butyl alcohol | 71-36-3 | 100 | 300 | - |\n\nSource: \n", "cas_number": "71-36-3", "file": "n-butyl-alcohol.md", "generated": true, "harvested": "2026-08-05", "id": "n-butyl-alcohol", "pel_mgm3": "300", "pel_ppm": "100", "source_quote": "n-Butyl alcohol | 71-36-3 | 100 | 300 | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "n-Butyl alcohol", "title": "n-Butyl alcohol \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** n-Butyl glycidyl ether; BGE; 1-butoxy-2,3-epoxypropane\n\n**CAS No.:** 2426086\n\n**PEL (ppm):** 25\n\n**PEL (mg/m\u00b3):** 135\n\n> 2426086 | | n-Butyl glycidyl ether; BGE; 1-butoxy-2,3-epoxypropane | 25 | 135\n\nSource: \n", "cas_number": "2426086", "file": "n-butyl-glycidyl-ether-bge-1-butoxy-2-3-epoxypropane.md", "generated": true, "harvested": "2026-08-05", "id": "n-butyl-glycidyl-ether-bge-1-butoxy-2-3-epoxypropane", "pel_mgm3": "135", "pel_ppm": "25", "source_quote": "2426086 | | n-Butyl glycidyl ether; BGE; 1-butoxy-2,3-epoxypropane | 25 | 135", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "n-Butyl glycidyl ether; BGE; 1-butoxy-2,3-epoxypropane", "title": "n-Butyl glycidyl ether; BGE; 1-butoxy-2,3-epoxypropane \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** n-Butyl glycidyl ether (BGE)\n\n**CAS No.:** 2426-08-6\n\n**PEL (ppm):** 50\n\n**PEL (mg/m\u00b3):** 270\n\n> n-Butyl glycidyl ether (BGE) | 2426-08-6 | 50 | 270 | - |\n\nSource: \n", "cas_number": "2426-08-6", "file": "n-butyl-glycidyl-ether-bge.md", "generated": true, "harvested": "2026-08-05", "id": "n-butyl-glycidyl-ether-bge", "pel_mgm3": "270", "pel_ppm": "50", "source_quote": "n-Butyl glycidyl ether (BGE) | 2426-08-6 | 50 | 270 | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "n-Butyl glycidyl ether (BGE)", "title": "n-Butyl glycidyl ether (BGE) \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** n-Butyl glycidyl ether\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - n-Butyl glycidyl ether\n\n**CAS No.:** 2426-08-6\n\n> CAS No. 2426-08-6\n\n**NIOSH REL (ppm):** C 5.6\n\n**NIOSH REL (mg/m\u00b3):** 30\n\n> NIOSH REL C 5.6 ppm (30 mg/m3) [15-minute]\n\nSource: \n", "cas_number": "2426-08-6", "file": "n-butyl-glycidyl-ether.md", "generated": true, "harvested": "2026-09-08", "id": "n-butyl-glycidyl-ether", "quote_cas_number": "CAS No. 2426-08-6", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - n-Butyl glycidyl ether", "rel_mgm3": "30", "rel_ppm": "C 5.6", "source_quote": "NIOSH REL C 5.6 ppm (30 mg/m3) [15-minute]", "sources": ["https://www.cdc.gov/niosh/npg/npgd0081.html"], "stale_after": "2027-09-08", "substance": "n-Butyl glycidyl ether", "title": "n-Butyl glycidyl ether \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** n-Butyl lactate\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - n-Butyl lactate\n\n**CAS No.:** 138-22-7\n\n> CAS No. 138-22-7\n\n**NIOSH REL (ppm):** TWA 5\n\n**NIOSH REL (mg/m\u00b3):** 25\n\n> NIOSH REL TWA 5 ppm (25 mg/m3)\n\nSource: \n", "cas_number": "138-22-7", "file": "n-butyl-lactate-2.md", "generated": true, "harvested": "2026-09-08", "id": "n-butyl-lactate-2", "quote_cas_number": "CAS No. 138-22-7", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - n-Butyl lactate", "rel_mgm3": "25", "rel_ppm": "TWA 5", "source_quote": "NIOSH REL TWA 5 ppm (25 mg/m3)", "sources": ["https://www.cdc.gov/niosh/npg/npgd0082.html"], "stale_after": "2027-09-08", "substance": "n-Butyl lactate", "title": "n-Butyl lactate \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** n-Butyl lactate\n\n**CAS No.:** 138227\n\n**PEL (ppm):** 5\n\n**PEL (mg/m\u00b3):** 25\n\n> 138227 | | n-Butyl lactate | 5 | 25\n\nSource: \n", "cas_number": "138227", "file": "n-butyl-lactate.md", "generated": true, "harvested": "2026-08-05", "id": "n-butyl-lactate", "pel_mgm3": "25", "pel_ppm": "5", "source_quote": "138227 | | n-Butyl lactate | 5 | 25", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "n-Butyl lactate", "title": "n-Butyl lactate \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** n-Butyl mercaptan\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - n-Butyl mercaptan\n\n**CAS No.:** 109-79-5\n\n> CAS No. 109-79-5\n\n**NIOSH REL (ppm):** C 0.5\n\n**NIOSH REL (mg/m\u00b3):** 1.8\n\n> NIOSH REL C 0.5 ppm (1.8 mg/m3) [15-minute]\n\nSource: \n", "cas_number": "109-79-5", "file": "n-butyl-mercaptan-2.md", "generated": true, "harvested": "2026-09-08", "id": "n-butyl-mercaptan-2", "quote_cas_number": "CAS No. 109-79-5", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - n-Butyl mercaptan", "rel_mgm3": "1.8", "rel_ppm": "C 0.5", "source_quote": "NIOSH REL C 0.5 ppm (1.8 mg/m3) [15-minute]", "sources": ["https://www.cdc.gov/niosh/npg/npgd0083.html"], "stale_after": "2027-09-08", "substance": "n-Butyl mercaptan", "title": "n-Butyl mercaptan \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** n-Butyl mercaptan\n\n**CAS No.:** 109795\n\n**PEL (ppm):** 0.5\n\n**PEL (mg/m\u00b3):** 1.5\n\n> 109795 | | n-Butyl mercaptan | 0.5 | 1.5\n\nSource: \n", "cas_number": "109795", "file": "n-butyl-mercaptan.md", "generated": true, "harvested": "2026-08-05", "id": "n-butyl-mercaptan", "pel_mgm3": "1.5", "pel_ppm": "0.5", "source_quote": "109795 | | n-Butyl mercaptan | 0.5 | 1.5", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "n-Butyl mercaptan", "title": "n-Butyl mercaptan \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** n-Butylamine\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - n-Butylamine\n\n**CAS No.:** 109-73-9\n\n> CAS No. 109-73-9\n\n**NIOSH REL (ppm):** C 5\n\n**NIOSH REL (mg/m\u00b3):** 15\n\n> NIOSH REL C 5 ppm (15 mg/m3) [skin]\n\nSource: \n", "cas_number": "109-73-9", "file": "n-butylamine.md", "generated": true, "harvested": "2026-09-08", "id": "n-butylamine", "quote_cas_number": "CAS No. 109-73-9", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - n-Butylamine", "rel_mgm3": "15", "rel_ppm": "C 5", "source_quote": "NIOSH REL C 5 ppm (15 mg/m3) [skin]", "sources": ["https://www.cdc.gov/niosh/npg/npgd0079.html"], "stale_after": "2027-09-08", "substance": "n-Butylamine", "title": "n-Butylamine \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** n-Butyronitrile\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - n-Butyronitrile\n\n**CAS No.:** 109-74-0\n\n> CAS No. 109-74-0\n\n**NIOSH REL (ppm):** TWA 8\n\n**NIOSH REL (mg/m\u00b3):** 22\n\n> NIOSH REL TWA 8 ppm (22 mg/m3)\n\nSource: \n", "cas_number": "109-74-0", "file": "n-butyronitrile.md", "generated": true, "harvested": "2026-09-08", "id": "n-butyronitrile", "quote_cas_number": "CAS No. 109-74-0", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - n-Butyronitrile", "rel_mgm3": "22", "rel_ppm": "TWA 8", "source_quote": "NIOSH REL TWA 8 ppm (22 mg/m3)", "sources": ["https://www.cdc.gov/niosh/npg/npgd0086.html"], "stale_after": "2027-09-08", "substance": "n-Butyronitrile", "title": "n-Butyronitrile \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** N-Ethylmorpholine\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - N-Ethylmorpholine\n\n**CAS No.:** 100-74-3\n\n> CAS No. 100-74-3\n\n**NIOSH REL (ppm):** TWA 5\n\n**NIOSH REL (mg/m\u00b3):** 23\n\n> NIOSH REL TWA 5 ppm (23 mg/m3) [skin]\n\nSource: \n", "cas_number": "100-74-3", "file": "n-ethylmorpholine-2.md", "generated": true, "harvested": "2026-09-08", "id": "n-ethylmorpholine-2", "quote_cas_number": "CAS No. 100-74-3", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - N-Ethylmorpholine", "rel_mgm3": "23", "rel_ppm": "TWA 5", "source_quote": "NIOSH REL TWA 5 ppm (23 mg/m3) [skin]", "sources": ["https://www.cdc.gov/niosh/npg/npgd0281.html"], "stale_after": "2027-09-08", "substance": "N-Ethylmorpholine", "title": "N-Ethylmorpholine \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** N-Ethylmorpholine; 4-ethyl-1, 4-tetrahydrooxazine\n\n**CAS No.:** 100743\n\n**PEL (ppm):** 5\n\n**PEL (mg/m\u00b3):** 23\n\n> 100743 | S | N-Ethylmorpholine; 4-ethyl-1, 4-tetrahydrooxazine | 5 | 23\n\nSource: \n", "cas_number": "100743", "file": "n-ethylmorpholine-4-ethyl-1-4-tetrahydrooxazine.md", "generated": true, "harvested": "2026-08-05", "id": "n-ethylmorpholine-4-ethyl-1-4-tetrahydrooxazine", "pel_mgm3": "23", "pel_ppm": "5", "source_quote": "100743 | S | N-Ethylmorpholine; 4-ethyl-1, 4-tetrahydrooxazine | 5 | 23", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "N-Ethylmorpholine; 4-ethyl-1, 4-tetrahydrooxazine", "title": "N-Ethylmorpholine; 4-ethyl-1, 4-tetrahydrooxazine \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** N-Ethylmorpholine\n\n**CAS No.:** 100-74-3\n\n**PEL (ppm):** 20\n\n**PEL (mg/m\u00b3):** 94\n\n> N-Ethylmorpholine | 100-74-3 | 20 | 94 | X |\n\nSource: \n", "cas_number": "100-74-3", "file": "n-ethylmorpholine.md", "generated": true, "harvested": "2026-08-05", "id": "n-ethylmorpholine", "pel_mgm3": "94", "pel_ppm": "20", "source_quote": "N-Ethylmorpholine | 100-74-3 | 20 | 94 | X |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "N-Ethylmorpholine", "title": "N-Ethylmorpholine \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** n-Heptane\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - n-Heptane\n\n**CAS No.:** 142-82-5\n\n> CAS No. 142-82-5\n\n**NIOSH REL (ppm):** TWA 85\n\n**NIOSH REL (mg/m\u00b3):** 350\n\n> NIOSH REL TWA 85 ppm (350 mg/m3) C 440 ppm (1800 mg/m3) [15-minute]\n\nSource: \n", "cas_number": "142-82-5", "file": "n-heptane-2.md", "generated": true, "harvested": "2026-09-08", "id": "n-heptane-2", "quote_cas_number": "CAS No. 142-82-5", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - n-Heptane", "rel_mgm3": "350", "rel_ppm": "TWA 85", "source_quote": "NIOSH REL TWA 85 ppm (350 mg/m3) C 440 ppm (1800 mg/m3) [15-minute]", "sources": ["https://www.cdc.gov/niosh/npg/npgd0312.html"], "stale_after": "2027-09-08", "substance": "n-Heptane", "title": "n-Heptane \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** n-Heptane\n\n**CAS No.:** 142825\n\n**PEL (ppm):** 400\n\n**PEL (mg/m\u00b3):** 1,600\n\n**STEL (ppm):** 500\n\n**STEL (mg/m\u00b3):** 2000\n\n> 142825 | | n-Heptane | 400 | 1,600 | | 500 | 2000\n\nSource: \n", "cas_number": "142825", "file": "n-heptane.md", "generated": true, "harvested": "2026-08-05", "id": "n-heptane", "pel_mgm3": "1,600", "pel_ppm": "400", "source_quote": "142825 | | n-Heptane | 400 | 1,600 | | 500 | 2000", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "stel_mgm3": "2000", "stel_ppm": "500", "substance": "n-Heptane", "title": "n-Heptane \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** n-Hexane\n\n**CAS No.:** 110543\n\n**PEL (ppm):** 50\n\n**PEL (mg/m\u00b3):** 180\n\n> 110543 | S | n-Hexane | 50 | 180\n\nSource: \n", "cas_number": "110543", "file": "n-hexane-2.md", "generated": true, "harvested": "2026-08-05", "id": "n-hexane-2", "pel_mgm3": "180", "pel_ppm": "50", "source_quote": "110543 | S | n-Hexane | 50 | 180", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "n-Hexane", "title": "n-Hexane \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** n-Hexane\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - n-Hexane\n\n**CAS No.:** 110-54-3\n\n> CAS No. 110-54-3\n\n**NIOSH REL (ppm):** TWA 50\n\n**NIOSH REL (mg/m\u00b3):** 180\n\n> NIOSH REL TWA 50 ppm (180 mg/m3)\n\nSource: \n", "cas_number": "110-54-3", "file": "n-hexane-3.md", "generated": true, "harvested": "2026-09-08", "id": "n-hexane-3", "quote_cas_number": "CAS No. 110-54-3", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - n-Hexane", "rel_mgm3": "180", "rel_ppm": "TWA 50", "source_quote": "NIOSH REL TWA 50 ppm (180 mg/m3)", "sources": ["https://www.cdc.gov/niosh/npg/npgd0322.html"], "stale_after": "2027-09-08", "substance": "n-Hexane", "title": "n-Hexane \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** n-Hexane\n\n**CAS No.:** 110-54-3\n\n**PEL (ppm):** 500\n\n**PEL (mg/m\u00b3):** 1800\n\n> n-Hexane | 110-54-3 | 500 | 1800 | - |\n\nSource: \n", "cas_number": "110-54-3", "file": "n-hexane.md", "generated": true, "harvested": "2026-08-05", "id": "n-hexane", "pel_mgm3": "1800", "pel_ppm": "500", "source_quote": "n-Hexane | 110-54-3 | 500 | 1800 | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "n-Hexane", "title": "n-Hexane \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** n-Hexanethiol\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - n-Hexanethiol\n\n**CAS No.:** 111-31-9\n\n> CAS No. 111-31-9\n\n**NIOSH REL (ppm):** C 0.5\n\n**NIOSH REL (mg/m\u00b3):** 2.7\n\n> NIOSH REL C 0.5 ppm (2.7 mg/m3) [15-minute]\n\nSource: \n", "cas_number": "111-31-9", "file": "n-hexanethiol.md", "generated": true, "harvested": "2026-09-08", "id": "n-hexanethiol", "quote_cas_number": "CAS No. 111-31-9", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - n-Hexanethiol", "rel_mgm3": "2.7", "rel_ppm": "C 0.5", "source_quote": "NIOSH REL C 0.5 ppm (2.7 mg/m3) [15-minute]", "sources": ["https://www.cdc.gov/niosh/npg/npgd0324.html"], "stale_after": "2027-09-08", "substance": "n-Hexanethiol", "title": "n-Hexanethiol \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** N-Isopropylaniline\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - N-Isopropylaniline\n\n**CAS No.:** 768-52-5\n\n> CAS No. 768-52-5\n\n**NIOSH REL (ppm):** TWA 2\n\n**NIOSH REL (mg/m\u00b3):** 10\n\n> NIOSH REL TWA 2 ppm (10 mg/m3) [skin]\n\nSource: \n", "cas_number": "768-52-5", "file": "n-isopropylaniline-2.md", "generated": true, "harvested": "2026-09-08", "id": "n-isopropylaniline-2", "quote_cas_number": "CAS No. 768-52-5", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - N-Isopropylaniline", "rel_mgm3": "10", "rel_ppm": "TWA 2", "source_quote": "NIOSH REL TWA 2 ppm (10 mg/m3) [skin]", "sources": ["https://www.cdc.gov/niosh/npg/npgd0361.html"], "stale_after": "2027-09-08", "substance": "N-Isopropylaniline", "title": "N-Isopropylaniline \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** N-isopropylaniline\n\n**CAS No.:** 768525\n\n**PEL (ppm):** 2\n\n**PEL (mg/m\u00b3):** 10\n\n> 768525 | S | N-isopropylaniline | 2 | 10\n\nSource: \n", "cas_number": "768525", "file": "n-isopropylaniline.md", "generated": true, "harvested": "2026-08-05", "id": "n-isopropylaniline", "pel_mgm3": "10", "pel_ppm": "2", "source_quote": "768525 | S | N-isopropylaniline | 2 | 10", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "N-isopropylaniline", "title": "N-isopropylaniline \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** N-Methylaniline; monomethylaniline\n\n**CAS No.:** 100618\n\n**PEL (ppm):** 0.5\n\n**PEL (mg/m\u00b3):** 2\n\n> 100618 | S | N-Methylaniline; monomethylaniline | 0.5 | 2\n\nSource: \n", "cas_number": "100618", "file": "n-methylaniline-monomethylaniline.md", "generated": true, "harvested": "2026-08-05", "id": "n-methylaniline-monomethylaniline", "pel_mgm3": "2", "pel_ppm": "0.5", "source_quote": "100618 | S | N-Methylaniline; monomethylaniline | 0.5 | 2", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "N-Methylaniline; monomethylaniline", "title": "N-Methylaniline; monomethylaniline \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** N-Methylpyrrolidone (NMP)\n\n**CAS No.:** 872504\n\n**PEL (ppm):** 1\n\n**PEL (mg/m\u00b3):** 4\n\n> 872504 | S | N-Methylpyrrolidone (NMP) | 1 | 4\n\nSource: \n", "cas_number": "872504", "file": "n-methylpyrrolidone-nmp.md", "generated": true, "harvested": "2026-08-05", "id": "n-methylpyrrolidone-nmp", "pel_mgm3": "4", "pel_ppm": "1", "source_quote": "872504 | S | N-Methylpyrrolidone (NMP) | 1 | 4", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "N-Methylpyrrolidone (NMP)", "title": "N-Methylpyrrolidone (NMP) \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** N,N-Dimethylaniline; dimethylphenylamine\n\n**CAS No.:** 121697\n\n**PEL (ppm):** 5\n\n**PEL (mg/m\u00b3):** 25\n\n**STEL (ppm):** 10\n\n**STEL (mg/m\u00b3):** 50\n\n> 121697 | S | N,N-Dimethylaniline; dimethylphenylamine | 5 | 25 | | 10 | 50\n\nSource: \n", "cas_number": "121697", "file": "n-n-dimethylaniline-dimethylphenylamine.md", "generated": true, "harvested": "2026-08-05", "id": "n-n-dimethylaniline-dimethylphenylamine", "pel_mgm3": "25", "pel_ppm": "5", "source_quote": "121697 | S | N,N-Dimethylaniline; dimethylphenylamine | 5 | 25 | | 10 | 50", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "stel_mgm3": "50", "stel_ppm": "10", "substance": "N,N-Dimethylaniline; dimethylphenylamine", "title": "N,N-Dimethylaniline; dimethylphenylamine \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** N,N-Dimethylaniline\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - N,N-Dimethylaniline\n\n**CAS No.:** 121-69-7\n\n> CAS No. 121-69-7\n\n**NIOSH REL (ppm):** TWA 5\n\n**NIOSH REL (mg/m\u00b3):** 25\n\n> NIOSH REL TWA 5 ppm (25 mg/m3) ST 10 ppm (50 mg/m3) [skin]\n\nSource: \n", "cas_number": "121-69-7", "file": "n-n-dimethylaniline.md", "generated": true, "harvested": "2026-09-08", "id": "n-n-dimethylaniline", "quote_cas_number": "CAS No. 121-69-7", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - N,N-Dimethylaniline", "rel_mgm3": "25", "rel_ppm": "TWA 5", "source_quote": "NIOSH REL TWA 5 ppm (25 mg/m3) ST 10 ppm (50 mg/m3) [skin]", "sources": ["https://www.cdc.gov/niosh/npg/npgd0223.html"], "stale_after": "2027-09-08", "substance": "N,N-Dimethylaniline", "title": "N,N-Dimethylaniline \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** N,N-Dimethylnitrosamine; see N-Nitrosodimethylamine, Section 5209\n\n**CAS No.:** 62759\n\n> 62759 | | N,N-Dimethylnitrosamine; see N-Nitrosodimethylamine, Section 5209\n\nSource: \n", "cas_number": "62759", "file": "n-n-dimethylnitrosamine-see-n-nitrosodimethylamine-section-5209.md", "generated": true, "harvested": "2026-08-05", "id": "n-n-dimethylnitrosamine-see-n-nitrosodimethylamine-section-5209", "source_quote": "62759 | | N,N-Dimethylnitrosamine; see N-Nitrosodimethylamine, Section 5209", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "N,N-Dimethylnitrosamine; see N-Nitrosodimethylamine, Section 5209", "title": "N,N-Dimethylnitrosamine; see N-Nitrosodimethylamine, Section 5209 \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** N-Nitrosodimethylamine, see Section 5209\n\n**CAS No.:** 62759\n\n> 62759 | | N-Nitrosodimethylamine, see Section 5209\n\nSource: \n", "cas_number": "62759", "file": "n-nitrosodimethylamine-see-section-5209.md", "generated": true, "harvested": "2026-08-05", "id": "n-nitrosodimethylamine-see-section-5209", "source_quote": "62759 | | N-Nitrosodimethylamine, see Section 5209", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "N-Nitrosodimethylamine, see Section 5209", "title": "N-Nitrosodimethylamine, see Section 5209 \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** N-Nitrosodimethylamine\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - N-Nitrosodimethylamine\n\n**CAS No.:** 62-75-9\n\n> CAS No. 62-75-9\n\n**NIOSH REL, as stated:** Ca See Appendix A\n\n> NIOSH REL Ca See Appendix A\n\nSource: \n", "cas_number": "62-75-9", "file": "n-nitrosodimethylamine.md", "generated": true, "harvested": "2026-09-08", "id": "n-nitrosodimethylamine", "quote_cas_number": "CAS No. 62-75-9", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - N-Nitrosodimethylamine", "rel_statement": "Ca See Appendix A", "source_quote": "NIOSH REL Ca See Appendix A", "sources": ["https://www.cdc.gov/niosh/npg/npgd0461.html"], "stale_after": "2027-09-08", "substance": "N-Nitrosodimethylamine", "title": "N-Nitrosodimethylamine \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** n-Pentane\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - n-Pentane\n\n**CAS No.:** 109-66-0\n\n> CAS No. 109-66-0\n\n**NIOSH REL (ppm):** TWA 120\n\n**NIOSH REL (mg/m\u00b3):** 350\n\n> NIOSH REL TWA 120 ppm (350 mg/m3) C 610 ppm (1800 mg/m3) [15-minute]\n\nSource: \n", "cas_number": "109-66-0", "file": "n-pentane.md", "generated": true, "harvested": "2026-09-08", "id": "n-pentane", "quote_cas_number": "CAS No. 109-66-0", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - n-Pentane", "rel_mgm3": "350", "rel_ppm": "TWA 120", "source_quote": "NIOSH REL TWA 120 ppm (350 mg/m3) C 610 ppm (1800 mg/m3) [15-minute]", "sources": ["https://www.cdc.gov/niosh/npg/npgd0486.html"], "stale_after": "2027-09-08", "substance": "n-Pentane", "title": "n-Pentane \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** N-Phenyl-\u03b2-naphthylamine\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - N-Phenyl-\u03b2-naphthylamine\n\n**CAS No.:** 135-88-6\n\n> CAS No. 135-88-6\n\n**NIOSH REL, as stated:** Ca* See Appendix A\n\n> NIOSH REL Ca* See Appendix A\n\nSource: \n", "cas_number": "135-88-6", "file": "n-phenyl-naphthylamine.md", "generated": true, "harvested": "2026-09-08", "id": "n-phenyl-naphthylamine", "quote_cas_number": "CAS No. 135-88-6", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - N-Phenyl-\u03b2-naphthylamine", "rel_statement": "Ca* See Appendix A", "source_quote": "NIOSH REL Ca* See Appendix A", "sources": ["https://www.cdc.gov/niosh/npg/npgd0500.html"], "stale_after": "2027-09-08", "substance": "N-Phenyl-\u03b2-naphthylamine", "title": "N-Phenyl-\u03b2-naphthylamine \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** n-Propyl acetate\n\n**CAS No.:** 109604\n\n**PEL (ppm):** 200\n\n**PEL (mg/m\u00b3):** 840\n\n**STEL (ppm):** 250\n\n**STEL (mg/m\u00b3):** 1050\n\n> 109604 | | n-Propyl acetate | 200 | 840 | | 250 | 1050\n\nSource: \n", "cas_number": "109604", "file": "n-propyl-acetate-2.md", "generated": true, "harvested": "2026-08-05", "id": "n-propyl-acetate-2", "pel_mgm3": "840", "pel_ppm": "200", "source_quote": "109604 | | n-Propyl acetate | 200 | 840 | | 250 | 1050", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "stel_mgm3": "1050", "stel_ppm": "250", "substance": "n-Propyl acetate", "title": "n-Propyl acetate \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** n-Propyl acetate\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - n-Propyl acetate\n\n**CAS No.:** 109-60-4\n\n> CAS No. 109-60-4\n\n**NIOSH REL (ppm):** TWA 200\n\n**NIOSH REL (mg/m\u00b3):** 840\n\n> NIOSH REL TWA 200 ppm (840 mg/m3) ST 250 ppm (1050 mg/m3)\n\nSource: \n", "cas_number": "109-60-4", "file": "n-propyl-acetate-3.md", "generated": true, "harvested": "2026-09-08", "id": "n-propyl-acetate-3", "quote_cas_number": "CAS No. 109-60-4", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - n-Propyl acetate", "rel_mgm3": "840", "rel_ppm": "TWA 200", "source_quote": "NIOSH REL TWA 200 ppm (840 mg/m3) ST 250 ppm (1050 mg/m3)", "sources": ["https://www.cdc.gov/niosh/npg/npgd0532.html"], "stale_after": "2027-09-08", "substance": "n-Propyl acetate", "title": "n-Propyl acetate \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** n-Propyl acetate\n\n**CAS No.:** 109-60-4\n\n**PEL (ppm):** 200\n\n**PEL (mg/m\u00b3):** 840\n\n> n-Propyl acetate | 109-60-4 | 200 | 840 | - |\n\nSource: \n", "cas_number": "109-60-4", "file": "n-propyl-acetate.md", "generated": true, "harvested": "2026-08-05", "id": "n-propyl-acetate", "pel_mgm3": "840", "pel_ppm": "200", "source_quote": "n-Propyl acetate | 109-60-4 | 200 | 840 | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "n-Propyl acetate", "title": "n-Propyl acetate \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** n-Propyl alcohol\n\n**CAS No.:** 71238\n\n**PEL (ppm):** 200\n\n**PEL (mg/m\u00b3):** 500\n\n**STEL (ppm):** 250\n\n**STEL (mg/m\u00b3):** 625\n\n> 71238 | S | n-Propyl alcohol | 200 | 500 | | 250 | 625\n\nSource: \n", "cas_number": "71238", "file": "n-propyl-alcohol-2.md", "generated": true, "harvested": "2026-08-05", "id": "n-propyl-alcohol-2", "pel_mgm3": "500", "pel_ppm": "200", "source_quote": "71238 | S | n-Propyl alcohol | 200 | 500 | | 250 | 625", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "stel_mgm3": "625", "stel_ppm": "250", "substance": "n-Propyl alcohol", "title": "n-Propyl alcohol \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** n-Propyl alcohol\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - n-Propyl alcohol\n\n**CAS No.:** 71-23-8\n\n> CAS No. 71-23-8\n\n**NIOSH REL (ppm):** TWA 200\n\n**NIOSH REL (mg/m\u00b3):** 500\n\n> NIOSH REL TWA 200 ppm (500 mg/m3) ST 250 ppm (625 mg/m3) [skin]\n\nSource: \n", "cas_number": "71-23-8", "file": "n-propyl-alcohol-3.md", "generated": true, "harvested": "2026-09-08", "id": "n-propyl-alcohol-3", "quote_cas_number": "CAS No. 71-23-8", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - n-Propyl alcohol", "rel_mgm3": "500", "rel_ppm": "TWA 200", "source_quote": "NIOSH REL TWA 200 ppm (500 mg/m3) ST 250 ppm (625 mg/m3) [skin]", "sources": ["https://www.cdc.gov/niosh/npg/npgd0533.html"], "stale_after": "2027-09-08", "substance": "n-Propyl alcohol", "title": "n-Propyl alcohol \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** n-Propyl alcohol\n\n**CAS No.:** 71-23-8\n\n**PEL (ppm):** 200\n\n**PEL (mg/m\u00b3):** 500\n\n> n-Propyl alcohol | 71-23-8 | 200 | 500 | - |\n\nSource: \n", "cas_number": "71-23-8", "file": "n-propyl-alcohol.md", "generated": true, "harvested": "2026-08-05", "id": "n-propyl-alcohol", "pel_mgm3": "500", "pel_ppm": "200", "source_quote": "n-Propyl alcohol | 71-23-8 | 200 | 500 | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "n-Propyl alcohol", "title": "n-Propyl alcohol \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** n-Propyl nitrate\n\n**CAS No.:** 627134\n\n**PEL (ppm):** 25\n\n**PEL (mg/m\u00b3):** 107\n\n**STEL (ppm):** 40\n\n**STEL (mg/m\u00b3):** 170\n\n> 627134 | | n-Propyl nitrate | 25 | 107 | | 40 | 170\n\nSource: \n", "cas_number": "627134", "file": "n-propyl-nitrate-2.md", "generated": true, "harvested": "2026-08-05", "id": "n-propyl-nitrate-2", "pel_mgm3": "107", "pel_ppm": "25", "source_quote": "627134 | | n-Propyl nitrate | 25 | 107 | | 40 | 170", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "stel_mgm3": "170", "stel_ppm": "40", "substance": "n-Propyl nitrate", "title": "n-Propyl nitrate \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** n-Propyl nitrate\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - n-Propyl nitrate\n\n**CAS No.:** 627-13-4\n\n> CAS No. 627-13-4\n\n**NIOSH REL (ppm):** TWA 25\n\n**NIOSH REL (mg/m\u00b3):** 105\n\n> NIOSH REL TWA 25 ppm (105 mg/m3) ST 40 ppm (170 mg/m3)\n\nSource: \n", "cas_number": "627-13-4", "file": "n-propyl-nitrate-3.md", "generated": true, "harvested": "2026-09-08", "id": "n-propyl-nitrate-3", "quote_cas_number": "CAS No. 627-13-4", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - n-Propyl nitrate", "rel_mgm3": "105", "rel_ppm": "TWA 25", "source_quote": "NIOSH REL TWA 25 ppm (105 mg/m3) ST 40 ppm (170 mg/m3)", "sources": ["https://www.cdc.gov/niosh/npg/npgd0539.html"], "stale_after": "2027-09-08", "substance": "n-Propyl nitrate", "title": "n-Propyl nitrate \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** n-Propyl nitrate\n\n**CAS No.:** 627-13-4\n\n**PEL (ppm):** 25\n\n**PEL (mg/m\u00b3):** 110\n\n> n-Propyl nitrate | 627-13-4 | 25 | 110 | - |\n\nSource: \n", "cas_number": "627-13-4", "file": "n-propyl-nitrate.md", "generated": true, "harvested": "2026-08-05", "id": "n-propyl-nitrate", "pel_mgm3": "110", "pel_ppm": "25", "source_quote": "n-Propyl nitrate | 627-13-4 | 25 | 110 | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "n-Propyl nitrate", "title": "n-Propyl nitrate \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** n-Valeraldehyde\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - n-Valeraldehyde\n\n**CAS No.:** 110-62-3\n\n> CAS No. 110-62-3\n\n**NIOSH REL (ppm):** TWA 50\n\n**NIOSH REL (mg/m\u00b3):** 175\n\n> NIOSH REL TWA 50 ppm (175 mg/m3)\n\nSource: \n", "cas_number": "110-62-3", "file": "n-valeraldehyde.md", "generated": true, "harvested": "2026-09-08", "id": "n-valeraldehyde", "quote_cas_number": "CAS No. 110-62-3", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - n-Valeraldehyde", "rel_mgm3": "175", "rel_ppm": "TWA 50", "source_quote": "NIOSH REL TWA 50 ppm (175 mg/m3)", "sources": ["https://www.cdc.gov/niosh/npg/npgd0652.html"], "stale_after": "2027-09-08", "substance": "n-Valeraldehyde", "title": "n-Valeraldehyde \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Naled; o,o-dimethyl o-(1,2-dibromo-2,2-dichloroethyl) phosphate\n\n**CAS No.:** 300765\n\n**PEL (mg/m\u00b3):** 3\n\n> 300765 | S | Naled; o,o-dimethyl o-(1,2-dibromo-2,2-dichloroethyl) phosphate | -- | 3\n\nSource: \n", "cas_number": "300765", "file": "naled-o-o-dimethyl-o-1-2-dibromo-2-2-dichloroethyl-phosphate.md", "generated": true, "harvested": "2026-08-05", "id": "naled-o-o-dimethyl-o-1-2-dibromo-2-2-dichloroethyl-phosphate", "pel_mgm3": "3", "source_quote": "300765 | S | Naled; o,o-dimethyl o-(1,2-dibromo-2,2-dichloroethyl) phosphate | -- | 3", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Naled; o,o-dimethyl o-(1,2-dibromo-2,2-dichloroethyl) phosphate", "title": "Naled; o,o-dimethyl o-(1,2-dibromo-2,2-dichloroethyl) phosphate \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Naphtha, coal tar\n\n**CAS No.:** 8030317\n\n**PEL (ppm):** 100\n\n**PEL (mg/m\u00b3):** 400\n\n> 8030317 | | Naphtha, coal tar | 100 | 400\n\nSource: \n", "cas_number": "8030317", "file": "naphtha-coal-tar-2.md", "generated": true, "harvested": "2026-08-05", "id": "naphtha-coal-tar-2", "pel_mgm3": "400", "pel_ppm": "100", "source_quote": "8030317 | | Naphtha, coal tar | 100 | 400", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Naphtha, coal tar", "title": "Naphtha, coal tar \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Naphtha (coal tar)\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Naphtha (coal tar)\n\n**CAS No.:** 8030-30-6\n\n> CAS No. 8030-30-6\n\n**NIOSH REL (ppm):** TWA 100\n\n**NIOSH REL (mg/m\u00b3):** 400\n\n> NIOSH REL TWA 100 ppm (400 mg/m3)\n\nSource: \n", "cas_number": "8030-30-6", "file": "naphtha-coal-tar-3.md", "generated": true, "harvested": "2026-09-08", "id": "naphtha-coal-tar-3", "quote_cas_number": "CAS No. 8030-30-6", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Naphtha (coal tar)", "rel_mgm3": "400", "rel_ppm": "TWA 100", "source_quote": "NIOSH REL TWA 100 ppm (400 mg/m3)", "sources": ["https://www.cdc.gov/niosh/npg/npgd0438.html"], "stale_after": "2027-09-08", "substance": "Naphtha (coal tar)", "title": "Naphtha (coal tar) \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Naphtha (Coal tar)\n\n**CAS No.:** 8030-30-6\n\n**PEL (ppm):** 100\n\n**PEL (mg/m\u00b3):** 400\n\n> Naphtha (Coal tar) | 8030-30-6 | 100 | 400 | - |\n\nSource: \n", "cas_number": "8030-30-6", "file": "naphtha-coal-tar.md", "generated": true, "harvested": "2026-08-05", "id": "naphtha-coal-tar", "pel_mgm3": "400", "pel_ppm": "100", "source_quote": "Naphtha (Coal tar) | 8030-30-6 | 100 | 400 | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Naphtha (Coal tar)", "title": "Naphtha (Coal tar) \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Naphthalene\n\n**CAS No.:** 91203\n\n**PEL (ppm):** 0.1\n\n**PEL (mg/m\u00b3):** 0.5\n\n> 91203 | S | Naphthalene | 0.1 | 0.5\n\nSource: \n", "cas_number": "91203", "file": "naphthalene-2.md", "generated": true, "harvested": "2026-08-05", "id": "naphthalene-2", "pel_mgm3": "0.5", "pel_ppm": "0.1", "source_quote": "91203 | S | Naphthalene | 0.1 | 0.5", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Naphthalene", "title": "Naphthalene \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Naphthalene\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Naphthalene\n\n**CAS No.:** 91-20-3\n\n> CAS No. 91-20-3\n\n**NIOSH REL (ppm):** TWA 10\n\n**NIOSH REL (mg/m\u00b3):** 50\n\n> NIOSH REL TWA 10 ppm (50 mg/m3) ST 15 ppm (75 mg/m3)\n\nSource: \n", "cas_number": "91-20-3", "file": "naphthalene-3.md", "generated": true, "harvested": "2026-09-08", "id": "naphthalene-3", "quote_cas_number": "CAS No. 91-20-3", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Naphthalene", "rel_mgm3": "50", "rel_ppm": "TWA 10", "source_quote": "NIOSH REL TWA 10 ppm (50 mg/m3) ST 15 ppm (75 mg/m3)", "sources": ["https://www.cdc.gov/niosh/npg/npgd0439.html"], "stale_after": "2027-09-08", "substance": "Naphthalene", "title": "Naphthalene \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Naphthalene diisocyanate; NDI\n\n**CAS No.:** 25551284\n\n**PEL (ppm):** 0.01\n\n**PEL (mg/m\u00b3):** 0.085\n\n**Ceiling:** C\n\n> 25551284 | | Naphthalene diisocyanate; NDI | 0.01 | 0.085 | C\n\nSource: \n", "cas_number": "25551284", "ceiling": "C", "file": "naphthalene-diisocyanate-ndi.md", "generated": true, "harvested": "2026-08-05", "id": "naphthalene-diisocyanate-ndi", "pel_mgm3": "0.085", "pel_ppm": "0.01", "source_quote": "25551284 | | Naphthalene diisocyanate; NDI | 0.01 | 0.085 | C", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Naphthalene diisocyanate; NDI", "title": "Naphthalene diisocyanate; NDI \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Naphthalene diisocyanate\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Naphthalene diisocyanate\n\n**CAS No.:** 3173-72-6\n\n> CAS No. 3173-72-6\n\n**NIOSH REL (ppm):** 0.005\n\n**NIOSH REL (mg/m\u00b3):** TWA 0.040\n\n> NIOSH REL TWA 0.040 mg/m3 (0.005 ppm) C 0.170 mg/m3 (0.020 ppm) [10-minute]\n\nSource: \n", "cas_number": "3173-72-6", "file": "naphthalene-diisocyanate.md", "generated": true, "harvested": "2026-09-08", "id": "naphthalene-diisocyanate", "quote_cas_number": "CAS No. 3173-72-6", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Naphthalene diisocyanate", "rel_mgm3": "TWA 0.040", "rel_ppm": "0.005", "source_quote": "NIOSH REL TWA 0.040 mg/m3 (0.005 ppm) C 0.170 mg/m3 (0.020 ppm) [10-minute]", "sources": ["https://www.cdc.gov/niosh/npg/npgd0440.html"], "stale_after": "2027-09-08", "substance": "Naphthalene diisocyanate", "title": "Naphthalene diisocyanate \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Naphthalene\n\n**CAS No.:** 91-20-3\n\n**PEL (ppm):** 10\n\n**PEL (mg/m\u00b3):** 50\n\n> Naphthalene | 91-20-3 | 10 | 50 | - |\n\nSource: \n", "cas_number": "91-20-3", "file": "naphthalene.md", "generated": true, "harvested": "2026-08-05", "id": "naphthalene", "pel_mgm3": "50", "pel_ppm": "10", "source_quote": "Naphthalene | 91-20-3 | 10 | 50 | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Naphthalene", "title": "Naphthalene \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Neon\n\n**CAS No.:** 7440019\n\n> 7440019 | | Neon | (h)\n\nSource: \n", "cas_number": "7440019", "file": "neon.md", "generated": true, "harvested": "2026-08-05", "id": "neon", "source_quote": "7440019 | | Neon | (h)", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Neon", "title": "Neon \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Niax\u00ae Catalyst ESN\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Niax\u00ae Catalyst ESN\n\n**CAS No.:** 62765-93-9\n\n> CAS No. 62765-93-9\n\n**NIOSH REL, as stated:** See Appendix C\n\n> NIOSH REL See Appendix C\n\nSource: \n", "cas_number": "62765-93-9", "file": "niax-catalyst-esn.md", "generated": true, "harvested": "2026-09-08", "id": "niax-catalyst-esn", "quote_cas_number": "CAS No. 62765-93-9", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Niax\u00ae Catalyst ESN", "rel_statement": "See Appendix C", "source_quote": "NIOSH REL See Appendix C", "sources": ["https://www.cdc.gov/niosh/npg/npgd0443.html"], "stale_after": "2027-09-08", "substance": "Niax\u00ae Catalyst ESN", "title": "Niax\u00ae Catalyst ESN \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Nickel carbonyl (as Ni)\n\n**CAS No.:** 13463-39-3\n\n**PEL (ppm):** 0.001\n\n**PEL (mg/m\u00b3):** 0.007\n\n> Nickel carbonyl (as Ni) | 13463-39-3 | 0.001 | 0.007 | - |\n\nSource: \n", "cas_number": "13463-39-3", "file": "nickel-carbonyl-as-ni.md", "generated": true, "harvested": "2026-08-05", "id": "nickel-carbonyl-as-ni", "pel_mgm3": "0.007", "pel_ppm": "0.001", "source_quote": "Nickel carbonyl (as Ni) | 13463-39-3 | 0.001 | 0.007 | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Nickel carbonyl (as Ni)", "title": "Nickel carbonyl (as Ni) \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Nickel carbonyl; Ni (CO)$4\n\n**CAS No.:** 13463393\n\n**PEL (ppm):** 0.001\n\n**PEL (mg/m\u00b3):** 0.007\n\n> 13463393 | | Nickel carbonyl; Ni (CO)$4 | 0.001 | 0.007\n\nSource: \n", "cas_number": "13463393", "file": "nickel-carbonyl-ni-co-4.md", "generated": true, "harvested": "2026-08-05", "id": "nickel-carbonyl-ni-co-4", "pel_mgm3": "0.007", "pel_ppm": "0.001", "source_quote": "13463393 | | Nickel carbonyl; Ni (CO)$4 | 0.001 | 0.007", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Nickel carbonyl; Ni (CO)$4", "title": "Nickel carbonyl; Ni (CO) $4 \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Nickel carbonyl\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Nickel carbonyl\n\n**CAS No.:** 13463-39-3\n\n> CAS No. 13463-39-3\n\n**NIOSH REL (ppm):** TWA 0.001\n\n**NIOSH REL (mg/m\u00b3):** 0.007\n\n> NIOSH REL Ca TWA 0.001 ppm (0.007 mg/m3)\n\nSource: \n", "cas_number": "13463-39-3", "file": "nickel-carbonyl.md", "generated": true, "harvested": "2026-09-08", "id": "nickel-carbonyl", "quote_cas_number": "CAS No. 13463-39-3", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Nickel carbonyl", "rel_mgm3": "0.007", "rel_ppm": "TWA 0.001", "source_quote": "NIOSH REL Ca TWA 0.001 ppm (0.007 mg/m3)", "sources": ["https://www.cdc.gov/niosh/npg/npgd0444.html"], "stale_after": "2027-09-08", "substance": "Nickel carbonyl", "title": "Nickel carbonyl \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Nickel, metal and insoluble compounds (as Ni)\n\n**CAS No.:** 7440-02-0\n\n**PEL (mg/m\u00b3):** 1\n\n> Nickel, metal and insoluble compounds (as Ni) | 7440-02-0 | - | 1 | - |\n\nSource: \n", "cas_number": "7440-02-0", "file": "nickel-metal-and-insoluble-compounds-as-ni.md", "generated": true, "harvested": "2026-08-05", "id": "nickel-metal-and-insoluble-compounds-as-ni", "pel_mgm3": "1", "source_quote": "Nickel, metal and insoluble compounds (as Ni) | 7440-02-0 | - | 1 | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Nickel, metal and insoluble compounds (as Ni)", "title": "Nickel, metal and insoluble compounds (as Ni) \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Nickel metal and other compounds (as Ni)\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Nickel metal and other compounds (as Ni)\n\n**CAS No.:** 7440-02-0 (Metal)\n\n> CAS No. 7440-02-0 (Metal)\n\n**NIOSH REL (mg/m\u00b3):** TWA 0.015\n\n> NIOSH REL Ca TWA 0.015 mg/m3\n\nSource: \n", "cas_number": "7440-02-0 (Metal)", "file": "nickel-metal-and-other-compounds-as-ni.md", "generated": true, "harvested": "2026-09-08", "id": "nickel-metal-and-other-compounds-as-ni", "quote_cas_number": "CAS No. 7440-02-0 (Metal)", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Nickel metal and other compounds (as Ni)", "rel_mgm3": "TWA 0.015", "source_quote": "NIOSH REL Ca TWA 0.015 mg/m3", "sources": ["https://www.cdc.gov/niosh/npg/npgd0445.html"], "stale_after": "2027-09-08", "substance": "Nickel metal and other compounds (as Ni)", "title": "Nickel metal and other compounds (as Ni) \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Nickel metal, as Ni\n\n**CAS No.:** 7440020\n\n**PEL (mg/m\u00b3):** 0.5\n\n> 7440020 | | Nickel metal, as Ni | -- | 0.5\n\nSource: \n", "cas_number": "7440020", "file": "nickel-metal-as-ni.md", "generated": true, "harvested": "2026-08-05", "id": "nickel-metal-as-ni", "pel_mgm3": "0.5", "source_quote": "7440020 | | Nickel metal, as Ni | -- | 0.5", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Nickel metal, as Ni", "title": "Nickel metal, as Ni \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Nickel, soluble compounds (as Ni)\n\n**CAS No.:** 7440-02-0\n\n**PEL (mg/m\u00b3):** 1\n\n> Nickel, soluble compounds (as Ni) | 7440-02-0 | - | 1 | - |\n\nSource: \n", "cas_number": "7440-02-0", "file": "nickel-soluble-compounds-as-ni.md", "generated": true, "harvested": "2026-08-05", "id": "nickel-soluble-compounds-as-ni", "pel_mgm3": "1", "source_quote": "Nickel, soluble compounds (as Ni) | 7440-02-0 | - | 1 | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Nickel, soluble compounds (as Ni)", "title": "Nickel, soluble compounds (as Ni) \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Nickel subsulfide\n\n**CAS No.:** 12035722\n\n**PEL (mg/m\u00b3):** .05\n\n> 12035722 | | Nickel subsulfide | -- | .05\n\nSource: \n", "cas_number": "12035722", "file": "nickel-subsulfide.md", "generated": true, "harvested": "2026-08-05", "id": "nickel-subsulfide", "pel_mgm3": ".05", "source_quote": "12035722 | | Nickel subsulfide | -- | .05", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Nickel subsulfide", "title": "Nickel subsulfide \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Nicotine; 1-methyl-2-(3-pyridyl)-pyrrolidine\n\n**CAS No.:** 54115\n\n**PEL (ppm):** 0.075\n\n**PEL (mg/m\u00b3):** 0.5\n\n> 54115 | S | Nicotine; 1-methyl-2-(3-pyridyl)-pyrrolidine | 0.075 | 0.5\n\nSource: \n", "cas_number": "54115", "file": "nicotine-1-methyl-2-3-pyridyl-pyrrolidine.md", "generated": true, "harvested": "2026-08-05", "id": "nicotine-1-methyl-2-3-pyridyl-pyrrolidine", "pel_mgm3": "0.5", "pel_ppm": "0.075", "source_quote": "54115 | S | Nicotine; 1-methyl-2-(3-pyridyl)-pyrrolidine | 0.075 | 0.5", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Nicotine; 1-methyl-2-(3-pyridyl)-pyrrolidine", "title": "Nicotine; 1-methyl-2-(3-pyridyl)-pyrrolidine \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Nicotine\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Nicotine\n\n**CAS No.:** 54-11-5\n\n> CAS No. 54-11-5\n\n**NIOSH REL (mg/m\u00b3):** TWA 0.5\n\n> NIOSH REL TWA 0.5 mg/m3 [skin]\n\nSource: \n", "cas_number": "54-11-5", "file": "nicotine-2.md", "generated": true, "harvested": "2026-09-08", "id": "nicotine-2", "quote_cas_number": "CAS No. 54-11-5", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Nicotine", "rel_mgm3": "TWA 0.5", "source_quote": "NIOSH REL TWA 0.5 mg/m3 [skin]", "sources": ["https://www.cdc.gov/niosh/npg/npgd0446.html"], "stale_after": "2027-09-08", "substance": "Nicotine", "title": "Nicotine \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Nicotine\n\n**CAS No.:** 54-11-5\n\n**PEL (mg/m\u00b3):** 0.5\n\n> Nicotine | 54-11-5 | - | 0.5 | X |\n\nSource: \n", "cas_number": "54-11-5", "file": "nicotine.md", "generated": true, "harvested": "2026-08-05", "id": "nicotine", "pel_mgm3": "0.5", "source_quote": "Nicotine | 54-11-5 | - | 0.5 | X |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Nicotine", "title": "Nicotine \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Nitrapyrin\n\n**CAS No.:** 1929824\n\n> 1929824 | | Nitrapyrin | --\n\nSource: \n", "cas_number": "1929824", "file": "nitrapyrin.md", "generated": true, "harvested": "2026-08-05", "id": "nitrapyrin", "source_quote": "1929824 | | Nitrapyrin | --", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Nitrapyrin", "title": "Nitrapyrin \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Nitric acid\n\n**CAS No.:** 7697372\n\n**PEL (ppm):** 2\n\n**PEL (mg/m\u00b3):** 5\n\n**STEL (ppm):** 4\n\n**STEL (mg/m\u00b3):** 10\n\n> 7697372 | | Nitric acid | 2 | 5 | | 4 | 10\n\nSource: \n", "cas_number": "7697372", "file": "nitric-acid-2.md", "generated": true, "harvested": "2026-08-05", "id": "nitric-acid-2", "pel_mgm3": "5", "pel_ppm": "2", "source_quote": "7697372 | | Nitric acid | 2 | 5 | | 4 | 10", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "stel_mgm3": "10", "stel_ppm": "4", "substance": "Nitric acid", "title": "Nitric acid \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Nitric acid\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Nitric acid\n\n**CAS No.:** 7697-37-2\n\n> CAS No. 7697-37-2\n\n**NIOSH REL (ppm):** TWA 2\n\n**NIOSH REL (mg/m\u00b3):** 5\n\n> NIOSH REL TWA 2 ppm (5 mg/m3) ST 4 ppm (10 mg/m3)\n\nSource: \n", "cas_number": "7697-37-2", "file": "nitric-acid-3.md", "generated": true, "harvested": "2026-09-08", "id": "nitric-acid-3", "quote_cas_number": "CAS No. 7697-37-2", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Nitric acid", "rel_mgm3": "5", "rel_ppm": "TWA 2", "source_quote": "NIOSH REL TWA 2 ppm (5 mg/m3) ST 4 ppm (10 mg/m3)", "sources": ["https://www.cdc.gov/niosh/npg/npgd0447.html"], "stale_after": "2027-09-08", "substance": "Nitric acid", "title": "Nitric acid \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Nitric acid\n\n**CAS No.:** 7697-37-2\n\n**PEL (ppm):** 2\n\n**PEL (mg/m\u00b3):** 5\n\n> Nitric acid | 7697-37-2 | 2 | 5 | - |\n\nSource: \n", "cas_number": "7697-37-2", "file": "nitric-acid.md", "generated": true, "harvested": "2026-08-05", "id": "nitric-acid", "pel_mgm3": "5", "pel_ppm": "2", "source_quote": "Nitric acid | 7697-37-2 | 2 | 5 | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Nitric acid", "title": "Nitric acid \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Nitric oxide\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Nitric oxide\n\n**CAS No.:** 10102-43-9\n\n> CAS No. 10102-43-9\n\n**NIOSH REL (ppm):** TWA 25\n\n**NIOSH REL (mg/m\u00b3):** 30\n\n> NIOSH REL TWA 25 ppm (30 mg/m3)\n\nSource: \n", "cas_number": "10102-43-9", "file": "nitric-oxide-2.md", "generated": true, "harvested": "2026-09-08", "id": "nitric-oxide-2", "quote_cas_number": "CAS No. 10102-43-9", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Nitric oxide", "rel_mgm3": "30", "rel_ppm": "TWA 25", "source_quote": "NIOSH REL TWA 25 ppm (30 mg/m3)", "sources": ["https://www.cdc.gov/niosh/npg/npgd0448.html"], "stale_after": "2027-09-08", "substance": "Nitric oxide", "title": "Nitric oxide \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Nitric oxide; NO\n\n**CAS No.:** 10102439\n\n**PEL (ppm):** 25\n\n**PEL (mg/m\u00b3):** 30\n\n> 10102439 | | Nitric oxide; NO | 25 | 30\n\nSource: \n", "cas_number": "10102439", "file": "nitric-oxide-no.md", "generated": true, "harvested": "2026-08-05", "id": "nitric-oxide-no", "pel_mgm3": "30", "pel_ppm": "25", "source_quote": "10102439 | | Nitric oxide; NO | 25 | 30", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Nitric oxide; NO", "title": "Nitric oxide; NO \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Nitric oxide\n\n**CAS No.:** 10102-43-9\n\n**PEL (ppm):** 25\n\n**PEL (mg/m\u00b3):** 30\n\n> Nitric oxide | 10102-43-9 | 25 | 30 | - |\n\nSource: \n", "cas_number": "10102-43-9", "file": "nitric-oxide.md", "generated": true, "harvested": "2026-08-05", "id": "nitric-oxide", "pel_mgm3": "30", "pel_ppm": "25", "source_quote": "Nitric oxide | 10102-43-9 | 25 | 30 | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Nitric oxide", "title": "Nitric oxide \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Nitrobenzene\n\n**CAS No.:** 98953\n\n**PEL (ppm):** 1\n\n**PEL (mg/m\u00b3):** 5\n\n> 98953 | S | Nitrobenzene | 1 | 5\n\nSource: \n", "cas_number": "98953", "file": "nitrobenzene-2.md", "generated": true, "harvested": "2026-08-05", "id": "nitrobenzene-2", "pel_mgm3": "5", "pel_ppm": "1", "source_quote": "98953 | S | Nitrobenzene | 1 | 5", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Nitrobenzene", "title": "Nitrobenzene \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Nitrobenzene\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Nitrobenzene\n\n**CAS No.:** 98-95-3\n\n> CAS No. 98-95-3\n\n**NIOSH REL (ppm):** TWA 1\n\n**NIOSH REL (mg/m\u00b3):** 5\n\n> NIOSH REL TWA 1 ppm (5 mg/m3) [skin]\n\nSource: \n", "cas_number": "98-95-3", "file": "nitrobenzene-3.md", "generated": true, "harvested": "2026-09-08", "id": "nitrobenzene-3", "quote_cas_number": "CAS No. 98-95-3", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Nitrobenzene", "rel_mgm3": "5", "rel_ppm": "TWA 1", "source_quote": "NIOSH REL TWA 1 ppm (5 mg/m3) [skin]", "sources": ["https://www.cdc.gov/niosh/npg/npgd0450.html"], "stale_after": "2027-09-08", "substance": "Nitrobenzene", "title": "Nitrobenzene \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Nitrobenzene\n\n**CAS No.:** 98-95-3\n\n**PEL (ppm):** 1\n\n**PEL (mg/m\u00b3):** 5\n\n> Nitrobenzene | 98-95-3 | 1 | 5 | X |\n\nSource: \n", "cas_number": "98-95-3", "file": "nitrobenzene.md", "generated": true, "harvested": "2026-08-05", "id": "nitrobenzene", "pel_mgm3": "5", "pel_ppm": "1", "source_quote": "Nitrobenzene | 98-95-3 | 1 | 5 | X |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Nitrobenzene", "title": "Nitrobenzene \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Nitroethane\n\n**CAS No.:** 79243\n\n**PEL (ppm):** 100\n\n**PEL (mg/m\u00b3):** 310\n\n> 79243 | | Nitroethane | 100 | 310\n\nSource: \n", "cas_number": "79243", "file": "nitroethane-2.md", "generated": true, "harvested": "2026-08-05", "id": "nitroethane-2", "pel_mgm3": "310", "pel_ppm": "100", "source_quote": "79243 | | Nitroethane | 100 | 310", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Nitroethane", "title": "Nitroethane \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Nitroethane\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Nitroethane\n\n**CAS No.:** 79-24-3\n\n> CAS No. 79-24-3\n\n**NIOSH REL (ppm):** TWA 100\n\n**NIOSH REL (mg/m\u00b3):** 310\n\n> NIOSH REL TWA 100 ppm (310 mg/m3)\n\nSource: \n", "cas_number": "79-24-3", "file": "nitroethane-3.md", "generated": true, "harvested": "2026-09-08", "id": "nitroethane-3", "quote_cas_number": "CAS No. 79-24-3", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Nitroethane", "rel_mgm3": "310", "rel_ppm": "TWA 100", "source_quote": "NIOSH REL TWA 100 ppm (310 mg/m3)", "sources": ["https://www.cdc.gov/niosh/npg/npgd0453.html"], "stale_after": "2027-09-08", "substance": "Nitroethane", "title": "Nitroethane \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Nitroethane\n\n**CAS No.:** 79-24-3\n\n**PEL (ppm):** 100\n\n**PEL (mg/m\u00b3):** 310\n\n> Nitroethane | 79-24-3 | 100 | 310 | - |\n\nSource: \n", "cas_number": "79-24-3", "file": "nitroethane.md", "generated": true, "harvested": "2026-08-05", "id": "nitroethane", "pel_mgm3": "310", "pel_ppm": "100", "source_quote": "Nitroethane | 79-24-3 | 100 | 310 | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Nitroethane", "title": "Nitroethane \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Nitrogen dioxide\n\n**CAS No.:** 10102440\n\n**STEL (ppm):** 1\n\n**STEL (mg/m\u00b3):** 1.8\n\n> 10102440 | | Nitrogen dioxide | | | | 1 | 1.8\n\nSource: \n", "cas_number": "10102440", "file": "nitrogen-dioxide-2.md", "generated": true, "harvested": "2026-08-05", "id": "nitrogen-dioxide-2", "source_quote": "10102440 | | Nitrogen dioxide | | | | 1 | 1.8", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "stel_mgm3": "1.8", "stel_ppm": "1", "substance": "Nitrogen dioxide", "title": "Nitrogen dioxide \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Nitrogen dioxide\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Nitrogen dioxide\n\n**CAS No.:** 10102-44-0\n\n> CAS No. 10102-44-0\n\n**NIOSH REL (ppm):** ST 1\n\n**NIOSH REL (mg/m\u00b3):** 1.8\n\n> NIOSH REL ST 1 ppm (1.8 mg/m\u00b3)\n\nSource: \n", "cas_number": "10102-44-0", "file": "nitrogen-dioxide-3.md", "generated": true, "harvested": "2026-09-08", "id": "nitrogen-dioxide-3", "quote_cas_number": "CAS No. 10102-44-0", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Nitrogen dioxide", "rel_mgm3": "1.8", "rel_ppm": "ST 1", "source_quote": "NIOSH REL ST 1 ppm (1.8 mg/m\u00b3)", "sources": ["https://www.cdc.gov/niosh/npg/npgd0454.html"], "stale_after": "2027-09-08", "substance": "Nitrogen dioxide", "title": "Nitrogen dioxide \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Nitrogen dioxide\n\n**CAS No.:** 10102-44-0\n\n**PEL (ppm):** (C)5\n\n**PEL (mg/m\u00b3):** (C)9\n\n> Nitrogen dioxide | 10102-44-0 | (C)5 | (C)9 | - |\n\nSource: \n", "cas_number": "10102-44-0", "file": "nitrogen-dioxide.md", "generated": true, "harvested": "2026-08-05", "id": "nitrogen-dioxide", "pel_mgm3": "(C)9", "pel_ppm": "(C)5", "source_quote": "Nitrogen dioxide | 10102-44-0 | (C)5 | (C)9 | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Nitrogen dioxide", "title": "Nitrogen dioxide \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Nitrogen trifluoride\n\n**CAS No.:** 7783542\n\n**PEL (ppm):** 10\n\n**PEL (mg/m\u00b3):** 29\n\n> 7783542 | | Nitrogen trifluoride | 10 | 29\n\nSource: \n", "cas_number": "7783542", "file": "nitrogen-trifluoride-2.md", "generated": true, "harvested": "2026-08-05", "id": "nitrogen-trifluoride-2", "pel_mgm3": "29", "pel_ppm": "10", "source_quote": "7783542 | | Nitrogen trifluoride | 10 | 29", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Nitrogen trifluoride", "title": "Nitrogen trifluoride \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Nitrogen trifluoride\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Nitrogen trifluoride\n\n**CAS No.:** 7783-54-2\n\n> CAS No. 7783-54-2\n\n**NIOSH REL (ppm):** TWA 10\n\n**NIOSH REL (mg/m\u00b3):** 29\n\n> NIOSH REL TWA 10 ppm (29 mg/m3)\n\nSource: \n", "cas_number": "7783-54-2", "file": "nitrogen-trifluoride-3.md", "generated": true, "harvested": "2026-09-08", "id": "nitrogen-trifluoride-3", "quote_cas_number": "CAS No. 7783-54-2", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Nitrogen trifluoride", "rel_mgm3": "29", "rel_ppm": "TWA 10", "source_quote": "NIOSH REL TWA 10 ppm (29 mg/m3)", "sources": ["https://www.cdc.gov/niosh/npg/npgd0455.html"], "stale_after": "2027-09-08", "substance": "Nitrogen trifluoride", "title": "Nitrogen trifluoride \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Nitrogen trifluoride\n\n**CAS No.:** 7783-54-2\n\n**PEL (ppm):** 10\n\n**PEL (mg/m\u00b3):** 29\n\n> Nitrogen trifluoride | 7783-54-2 | 10 | 29 | - |\n\nSource: \n", "cas_number": "7783-54-2", "file": "nitrogen-trifluoride.md", "generated": true, "harvested": "2026-08-05", "id": "nitrogen-trifluoride", "pel_mgm3": "29", "pel_ppm": "10", "source_quote": "Nitrogen trifluoride | 7783-54-2 | 10 | 29 | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Nitrogen trifluoride", "title": "Nitrogen trifluoride \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Nitrogen\n\n**CAS No.:** 7727379\n\n> 7727379 | | Nitrogen | (h) | --\n\nSource: \n", "cas_number": "7727379", "file": "nitrogen.md", "generated": true, "harvested": "2026-08-05", "id": "nitrogen", "source_quote": "7727379 | | Nitrogen | (h) | --", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Nitrogen", "title": "Nitrogen \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Nitroglycerin\n\n**CAS No.:** 55630\n\n**STEL (mg/m\u00b3):** 0.1\n\n> 55630 | S | Nitroglycerin | | (k) | | -- | 0.1\n\nSource: \n", "cas_number": "55630", "file": "nitroglycerin-2.md", "generated": true, "harvested": "2026-08-05", "id": "nitroglycerin-2", "source_quote": "55630 | S | Nitroglycerin | | (k) | | -- | 0.1", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "stel_mgm3": "0.1", "substance": "Nitroglycerin", "title": "Nitroglycerin \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Nitroglycerin\n\n**CAS No.:** 55-63-0\n\n**PEL (ppm):** (C)0.2\n\n**PEL (mg/m\u00b3):** (C)2\n\n> Nitroglycerin | 55-63-0 | (C)0.2 | (C)2 | X |\n\nSource: \n", "cas_number": "55-63-0", "file": "nitroglycerin.md", "generated": true, "harvested": "2026-08-05", "id": "nitroglycerin", "pel_mgm3": "(C)2", "pel_ppm": "(C)0.2", "source_quote": "Nitroglycerin | 55-63-0 | (C)0.2 | (C)2 | X |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Nitroglycerin", "title": "Nitroglycerin \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Nitroglycerine\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Nitroglycerine\n\n**CAS No.:** 55-63-0\n\n> CAS No. 55-63-0\n\n**NIOSH REL (mg/m\u00b3):** ST 0.1\n\n> NIOSH REL ST 0.1 mg/m3 [skin]\n\nSource: \n", "cas_number": "55-63-0", "file": "nitroglycerine.md", "generated": true, "harvested": "2026-09-08", "id": "nitroglycerine", "quote_cas_number": "CAS No. 55-63-0", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Nitroglycerine", "rel_mgm3": "ST 0.1", "source_quote": "NIOSH REL ST 0.1 mg/m3 [skin]", "sources": ["https://www.cdc.gov/niosh/npg/npgd0456.html"], "stale_after": "2027-09-08", "substance": "Nitroglycerine", "title": "Nitroglycerine \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Nitromethane\n\n**CAS No.:** 75525\n\n**PEL (ppm):** 2\n\n**PEL (mg/m\u00b3):** 5\n\n> 75525 | | Nitromethane | 2 | 5\n\nSource: \n", "cas_number": "75525", "file": "nitromethane-2.md", "generated": true, "harvested": "2026-08-05", "id": "nitromethane-2", "pel_mgm3": "5", "pel_ppm": "2", "source_quote": "75525 | | Nitromethane | 2 | 5", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Nitromethane", "title": "Nitromethane \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Nitromethane\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Nitromethane\n\n**CAS No.:** 75-52-5\n\n> CAS No. 75-52-5\n\n**NIOSH REL, as stated:** See Appendix D\n\n> NIOSH REL See Appendix D\n\nSource: \n", "cas_number": "75-52-5", "file": "nitromethane-3.md", "generated": true, "harvested": "2026-09-08", "id": "nitromethane-3", "quote_cas_number": "CAS No. 75-52-5", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Nitromethane", "rel_statement": "See Appendix D", "source_quote": "NIOSH REL See Appendix D", "sources": ["https://www.cdc.gov/niosh/npg/npgd0457.html"], "stale_after": "2027-09-08", "substance": "Nitromethane", "title": "Nitromethane \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Nitromethane\n\n**CAS No.:** 75-52-5\n\n**PEL (ppm):** 100\n\n**PEL (mg/m\u00b3):** 250\n\n> Nitromethane | 75-52-5 | 100 | 250 | - |\n\nSource: \n", "cas_number": "75-52-5", "file": "nitromethane.md", "generated": true, "harvested": "2026-08-05", "id": "nitromethane", "pel_mgm3": "250", "pel_ppm": "100", "source_quote": "Nitromethane | 75-52-5 | 100 | 250 | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Nitromethane", "title": "Nitromethane \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Nitrotrichloromethane; see Chloropicrin\n\n**CAS No.:** 76062\n\n> 76062 | | Nitrotrichloromethane; see Chloropicrin\n\nSource: \n", "cas_number": "76062", "file": "nitrotrichloromethane-see-chloropicrin.md", "generated": true, "harvested": "2026-08-05", "id": "nitrotrichloromethane-see-chloropicrin", "source_quote": "76062 | | Nitrotrichloromethane; see Chloropicrin", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Nitrotrichloromethane; see Chloropicrin", "title": "Nitrotrichloromethane; see Chloropicrin \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Nitrous oxide\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Nitrous oxide\n\n**CAS No.:** 10024-97-2\n\n> CAS No. 10024-97-2\n\n**NIOSH REL (ppm):** TWA 25\n\n**NIOSH REL (mg/m\u00b3):** 46\n\n> NIOSH REL TWA 25 ppm (46 mg/m3) (TWA over the time exposed)\n\nSource: \n", "cas_number": "10024-97-2", "file": "nitrous-oxide-2.md", "generated": true, "harvested": "2026-09-08", "id": "nitrous-oxide-2", "quote_cas_number": "CAS No. 10024-97-2", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Nitrous oxide", "rel_mgm3": "46", "rel_ppm": "TWA 25", "source_quote": "NIOSH REL TWA 25 ppm (46 mg/m3) (TWA over the time exposed)", "sources": ["https://www.cdc.gov/niosh/npg/npgd0465.html"], "stale_after": "2027-09-08", "substance": "Nitrous oxide", "title": "Nitrous oxide \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Nitrous oxide\n\n**CAS No.:** 0024972\n\n**PEL (ppm):** 50\n\n**PEL (mg/m\u00b3):** 90\n\n> 0024972 | | Nitrous oxide | 50 | 90\n\nSource: \n", "cas_number": "0024972", "file": "nitrous-oxide.md", "generated": true, "harvested": "2026-08-05", "id": "nitrous-oxide", "pel_mgm3": "90", "pel_ppm": "50", "source_quote": "0024972 | | Nitrous oxide | 50 | 90", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Nitrous oxide", "title": "Nitrous oxide \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Nonane\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Nonane\n\n**CAS No.:** 111-84-2\n\n> CAS No. 111-84-2\n\n**NIOSH REL (ppm):** TWA 200\n\n**NIOSH REL (mg/m\u00b3):** 1050\n\n> NIOSH REL TWA 200 ppm (1050 mg/m3)\n\nSource: \n", "cas_number": "111-84-2", "file": "nonane-2.md", "generated": true, "harvested": "2026-09-08", "id": "nonane-2", "quote_cas_number": "CAS No. 111-84-2", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Nonane", "rel_mgm3": "1050", "rel_ppm": "TWA 200", "source_quote": "NIOSH REL TWA 200 ppm (1050 mg/m3)", "sources": ["https://www.cdc.gov/niosh/npg/npgd0466.html"], "stale_after": "2027-09-08", "substance": "Nonane", "title": "Nonane \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Nonane\n\n**CAS No.:** 111842\n\n**PEL (ppm):** 200\n\n**PEL (mg/m\u00b3):** 1,050\n\n> 111842 | | Nonane | 200 | 1,050\n\nSource: \n", "cas_number": "111842", "file": "nonane.md", "generated": true, "harvested": "2026-08-05", "id": "nonane", "pel_mgm3": "1,050", "pel_ppm": "200", "source_quote": "111842 | | Nonane | 200 | 1,050", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Nonane", "title": "Nonane \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** o-Anisidine\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - o-Anisidine\n\n**CAS No.:** 90-04-0\n\n> CAS No. 90-04-0\n\n**NIOSH REL (mg/m\u00b3):** TWA 0.5\n\n> NIOSH REL Ca TWA 0.5 mg/m3 [skin]\n\nSource: \n", "cas_number": "90-04-0", "file": "o-anisidine.md", "generated": true, "harvested": "2026-09-08", "id": "o-anisidine", "quote_cas_number": "CAS No. 90-04-0", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - o-Anisidine", "rel_mgm3": "TWA 0.5", "source_quote": "NIOSH REL Ca TWA 0.5 mg/m3 [skin]", "sources": ["https://www.cdc.gov/niosh/npg/npgd0034.html"], "stale_after": "2027-09-08", "substance": "o-Anisidine", "title": "o-Anisidine \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** o-Chlorobenzylidene malononitrile\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - o-Chlorobenzylidene malononitrile\n\n**CAS No.:** 2698-41-1\n\n> CAS No. 2698-41-1\n\n**NIOSH REL (ppm):** C 0.05\n\n**NIOSH REL (mg/m\u00b3):** 0.4\n\n> NIOSH REL C 0.05 ppm (0.4 mg/m3) [skin]\n\nSource: \n", "cas_number": "2698-41-1", "file": "o-chlorobenzylidene-malononitrile-2.md", "generated": true, "harvested": "2026-09-08", "id": "o-chlorobenzylidene-malononitrile-2", "quote_cas_number": "CAS No. 2698-41-1", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - o-Chlorobenzylidene malononitrile", "rel_mgm3": "0.4", "rel_ppm": "C 0.05", "source_quote": "NIOSH REL C 0.05 ppm (0.4 mg/m3) [skin]", "sources": ["https://www.cdc.gov/niosh/npg/npgd0122.html"], "stale_after": "2027-09-08", "substance": "o-Chlorobenzylidene malononitrile", "title": "o-Chlorobenzylidene malononitrile \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** o-Chlorobenzylidene malononitrile; OCBM\n\n**CAS No.:** 2698411\n\n**PEL (ppm):** 0.05\n\n**PEL (mg/m\u00b3):** 0.4\n\n**Ceiling:** C\n\n> 2698411 | S | o-Chlorobenzylidene malononitrile; OCBM | 0.05 | 0.4 | C\n\nSource: \n", "cas_number": "2698411", "ceiling": "C", "file": "o-chlorobenzylidene-malononitrile-ocbm.md", "generated": true, "harvested": "2026-08-05", "id": "o-chlorobenzylidene-malononitrile-ocbm", "pel_mgm3": "0.4", "pel_ppm": "0.05", "source_quote": "2698411 | S | o-Chlorobenzylidene malononitrile; OCBM | 0.05 | 0.4 | C", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "o-Chlorobenzylidene malononitrile; OCBM", "title": "o-Chlorobenzylidene malononitrile; OCBM \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** o-Chlorobenzylidene malononitrile\n\n**CAS No.:** 2698-41-1\n\n**PEL (ppm):** 0.05\n\n**PEL (mg/m\u00b3):** 0.4\n\n> o-Chlorobenzylidene malononitrile | 2698-41-1 | 0.05 | 0.4 | - |\n\nSource: \n", "cas_number": "2698-41-1", "file": "o-chlorobenzylidene-malononitrile.md", "generated": true, "harvested": "2026-08-05", "id": "o-chlorobenzylidene-malononitrile", "pel_mgm3": "0.4", "pel_ppm": "0.05", "source_quote": "o-Chlorobenzylidene malononitrile | 2698-41-1 | 0.05 | 0.4 | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "o-Chlorobenzylidene malononitrile", "title": "o-Chlorobenzylidene malononitrile \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** o-Chlorostyrene\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - o-Chlorostyrene\n\n**CAS No.:** 2039-87-4\n\n> CAS No. 2039-87-4\n\n**NIOSH REL (ppm):** TWA 50\n\n**NIOSH REL (mg/m\u00b3):** 285\n\n> NIOSH REL TWA 50 ppm (285 mg/m3) ST 75 ppm (428 mg/m3)\n\nSource: \n", "cas_number": "2039-87-4", "file": "o-chlorostyrene-2.md", "generated": true, "harvested": "2026-09-08", "id": "o-chlorostyrene-2", "quote_cas_number": "CAS No. 2039-87-4", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - o-Chlorostyrene", "rel_mgm3": "285", "rel_ppm": "TWA 50", "source_quote": "NIOSH REL TWA 50 ppm (285 mg/m3) ST 75 ppm (428 mg/m3)", "sources": ["https://www.cdc.gov/niosh/npg/npgd0134.html"], "stale_after": "2027-09-08", "substance": "o-Chlorostyrene", "title": "o-Chlorostyrene \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** o-Chlorostyrene\n\n**CAS No.:** 2039874\n\n**PEL (ppm):** 50\n\n**PEL (mg/m\u00b3):** 285\n\n**STEL (ppm):** 75\n\n**STEL (mg/m\u00b3):** 428\n\n> 2039874 | | o-Chlorostyrene | 50 | 285 | | 75 | 428\n\nSource: \n", "cas_number": "2039874", "file": "o-chlorostyrene.md", "generated": true, "harvested": "2026-08-05", "id": "o-chlorostyrene", "pel_mgm3": "285", "pel_ppm": "50", "source_quote": "2039874 | | o-Chlorostyrene | 50 | 285 | | 75 | 428", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "stel_mgm3": "428", "stel_ppm": "75", "substance": "o-Chlorostyrene", "title": "o-Chlorostyrene \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** o-Chlorotoluene\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - o-Chlorotoluene\n\n**CAS No.:** 95-49-8\n\n> CAS No. 95-49-8\n\n**NIOSH REL (ppm):** TWA 50\n\n**NIOSH REL (mg/m\u00b3):** 250\n\n> NIOSH REL TWA 50 ppm (250 mg/m3) ST 75 ppm (375 mg/m3)\n\nSource: \n", "cas_number": "95-49-8", "file": "o-chlorotoluene-2.md", "generated": true, "harvested": "2026-09-08", "id": "o-chlorotoluene-2", "quote_cas_number": "CAS No. 95-49-8", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - o-Chlorotoluene", "rel_mgm3": "250", "rel_ppm": "TWA 50", "source_quote": "NIOSH REL TWA 50 ppm (250 mg/m3) ST 75 ppm (375 mg/m3)", "sources": ["https://www.cdc.gov/niosh/npg/npgd0135.html"], "stale_after": "2027-09-08", "substance": "o-Chlorotoluene", "title": "o-Chlorotoluene \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** o-Chlorotoluene\n\n**CAS No.:** 95498\n\n**PEL (ppm):** 50\n\n**PEL (mg/m\u00b3):** 250\n\n> 95498 | S | o-Chlorotoluene | 50 | 250\n\nSource: \n", "cas_number": "95498", "file": "o-chlorotoluene.md", "generated": true, "harvested": "2026-08-05", "id": "o-chlorotoluene", "pel_mgm3": "250", "pel_ppm": "50", "source_quote": "95498 | S | o-Chlorotoluene | 50 | 250", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "o-Chlorotoluene", "title": "o-Chlorotoluene \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** o-Cresol\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - o-Cresol\n\n**CAS No.:** 95-48-7\n\n> CAS No. 95-48-7\n\n**NIOSH REL (ppm):** TWA 2.3\n\n**NIOSH REL (mg/m\u00b3):** 10\n\n> NIOSH REL TWA 2.3 ppm (10 mg/m3)\n\nSource: \n", "cas_number": "95-48-7", "file": "o-cresol.md", "generated": true, "harvested": "2026-09-08", "id": "o-cresol", "quote_cas_number": "CAS No. 95-48-7", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - o-Cresol", "rel_mgm3": "10", "rel_ppm": "TWA 2.3", "source_quote": "NIOSH REL TWA 2.3 ppm (10 mg/m3)", "sources": ["https://www.cdc.gov/niosh/npg/npgd0154.html"], "stale_after": "2027-09-08", "substance": "o-Cresol", "title": "o-Cresol \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** o-Dianisidine\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - o-Dianisidine\n\n**CAS No.:** 119-90-4\n\n> CAS No. 119-90-4\n\n**NIOSH REL, as stated:** Ca See Appendix A See Appendix C\n\n> NIOSH REL Ca See Appendix A See Appendix C\n\nSource: \n", "cas_number": "119-90-4", "file": "o-dianisidine.md", "generated": true, "harvested": "2026-09-08", "id": "o-dianisidine", "quote_cas_number": "CAS No. 119-90-4", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - o-Dianisidine", "rel_statement": "Ca See Appendix A See Appendix C", "source_quote": "NIOSH REL Ca See Appendix A See Appendix C", "sources": ["https://www.cdc.gov/niosh/npg/npgd0180.html"], "stale_after": "2027-09-08", "substance": "o-Dianisidine", "title": "o-Dianisidine \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** o-Dichlorobenzene\n\n**CAS No.:** 95501\n\n**PEL (ppm):** 25\n\n**PEL (mg/m\u00b3):** 150\n\n**Ceiling:** 50 ppm\n\n> 95501 | S | o-Dichlorobenzene | 25 | 150 | 50 ppm\n\nSource: \n", "cas_number": "95501", "ceiling": "50 ppm", "file": "o-dichlorobenzene-2.md", "generated": true, "harvested": "2026-08-05", "id": "o-dichlorobenzene-2", "pel_mgm3": "150", "pel_ppm": "25", "source_quote": "95501 | S | o-Dichlorobenzene | 25 | 150 | 50 ppm", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "o-Dichlorobenzene", "title": "o-Dichlorobenzene \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** o-Dichlorobenzene\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - o-Dichlorobenzene\n\n**CAS No.:** 95-50-1\n\n> CAS No. 95-50-1\n\n**NIOSH REL (ppm):** C 50\n\n**NIOSH REL (mg/m\u00b3):** 300\n\n> NIOSH REL C 50 ppm (300 mg/m3)\n\nSource: \n", "cas_number": "95-50-1", "file": "o-dichlorobenzene-3.md", "generated": true, "harvested": "2026-09-08", "id": "o-dichlorobenzene-3", "quote_cas_number": "CAS No. 95-50-1", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - o-Dichlorobenzene", "rel_mgm3": "300", "rel_ppm": "C 50", "source_quote": "NIOSH REL C 50 ppm (300 mg/m3)", "sources": ["https://www.cdc.gov/niosh/npg/npgd0189.html"], "stale_after": "2027-09-08", "substance": "o-Dichlorobenzene", "title": "o-Dichlorobenzene \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** o-Dichlorobenzene\n\n**CAS No.:** 95-50-1\n\n**PEL (ppm):** (C)50\n\n**PEL (mg/m\u00b3):** (C)300\n\n> o-Dichlorobenzene | 95-50-1 | (C)50 | (C)300 | - |\n\nSource: \n", "cas_number": "95-50-1", "file": "o-dichlorobenzene.md", "generated": true, "harvested": "2026-08-05", "id": "o-dichlorobenzene", "pel_mgm3": "(C)300", "pel_ppm": "(C)50", "source_quote": "o-Dichlorobenzene | 95-50-1 | (C)50 | (C)300 | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "o-Dichlorobenzene", "title": "o-Dichlorobenzene \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** o-Dinitrobenzene\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - o-Dinitrobenzene\n\n**CAS No.:** 528-29-0\n\n> CAS No. 528-29-0\n\n**NIOSH REL (mg/m\u00b3):** TWA 1\n\n> NIOSH REL TWA 1 mg/m3 [skin]\n\nSource: \n", "cas_number": "528-29-0", "file": "o-dinitrobenzene.md", "generated": true, "harvested": "2026-09-08", "id": "o-dinitrobenzene", "quote_cas_number": "CAS No. 528-29-0", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - o-Dinitrobenzene", "rel_mgm3": "TWA 1", "source_quote": "NIOSH REL TWA 1 mg/m3 [skin]", "sources": ["https://www.cdc.gov/niosh/npg/npgd0231.html"], "stale_after": "2027-09-08", "substance": "o-Dinitrobenzene", "title": "o-Dinitrobenzene \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** o-isomer\n\n**CAS No.:** 88-72-2\n\n> o-isomer | 88-72-2 | - | - | - |\n\nSource: \n", "cas_number": "88-72-2", "file": "o-isomer.md", "generated": true, "harvested": "2026-08-05", "id": "o-isomer", "source_quote": "o-isomer | 88-72-2 | - | - | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "o-isomer", "title": "o-isomer \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** o-Methylaniline; see o-Toluidine\n\n**CAS No.:** 95534\n\n> 95534 | | o-Methylaniline; see o-Toluidine\n\nSource: \n", "cas_number": "95534", "file": "o-methylaniline-see-o-toluidine.md", "generated": true, "harvested": "2026-08-05", "id": "o-methylaniline-see-o-toluidine", "source_quote": "95534 | | o-Methylaniline; see o-Toluidine", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "o-Methylaniline; see o-Toluidine", "title": "o-Methylaniline; see o-Toluidine \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** o-Methylcyclohexanone\n\n**CAS No.:** 583608\n\n**PEL (ppm):** 50\n\n**PEL (mg/m\u00b3):** 230\n\n**STEL (ppm):** 75\n\n**STEL (mg/m\u00b3):** 345\n\n> 583608 | S | o-Methylcyclohexanone | 50 | 230 | | 75 | 345\n\nSource: \n", "cas_number": "583608", "file": "o-methylcyclohexanone-2.md", "generated": true, "harvested": "2026-08-05", "id": "o-methylcyclohexanone-2", "pel_mgm3": "230", "pel_ppm": "50", "source_quote": "583608 | S | o-Methylcyclohexanone | 50 | 230 | | 75 | 345", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "stel_mgm3": "345", "stel_ppm": "75", "substance": "o-Methylcyclohexanone", "title": "o-Methylcyclohexanone \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** o-Methylcyclohexanone\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - o-Methylcyclohexanone\n\n**CAS No.:** 583-60-8\n\n> CAS No. 583-60-8\n\n**NIOSH REL (ppm):** TWA 50\n\n**NIOSH REL (mg/m\u00b3):** 230\n\n> NIOSH REL TWA 50 ppm (230 mg/m3) ST 75 ppm (345 mg/m3) [skin]\n\nSource: \n", "cas_number": "583-60-8", "file": "o-methylcyclohexanone-3.md", "generated": true, "harvested": "2026-09-08", "id": "o-methylcyclohexanone-3", "quote_cas_number": "CAS No. 583-60-8", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - o-Methylcyclohexanone", "rel_mgm3": "230", "rel_ppm": "TWA 50", "source_quote": "NIOSH REL TWA 50 ppm (230 mg/m3) ST 75 ppm (345 mg/m3) [skin]", "sources": ["https://www.cdc.gov/niosh/npg/npgd0408.html"], "stale_after": "2027-09-08", "substance": "o-Methylcyclohexanone", "title": "o-Methylcyclohexanone \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** o-Methylcyclohexanone\n\n**CAS No.:** 583-60-8\n\n**PEL (ppm):** 100\n\n**PEL (mg/m\u00b3):** 460\n\n> o-Methylcyclohexanone | 583-60-8 | 100 | 460 | X |\n\nSource: \n", "cas_number": "583-60-8", "file": "o-methylcyclohexanone.md", "generated": true, "harvested": "2026-08-05", "id": "o-methylcyclohexanone", "pel_mgm3": "460", "pel_ppm": "100", "source_quote": "o-Methylcyclohexanone | 583-60-8 | 100 | 460 | X |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "o-Methylcyclohexanone", "title": "o-Methylcyclohexanone \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** o-Nitrotoluene\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - o-Nitrotoluene\n\n**CAS No.:** 88-72-2\n\n> CAS No. 88-72-2\n\n**NIOSH REL (ppm):** TWA 2\n\n**NIOSH REL (mg/m\u00b3):** 11\n\n> NIOSH REL TWA 2 ppm (11 mg/m3) [skin]\n\nSource: \n", "cas_number": "88-72-2", "file": "o-nitrotoluene.md", "generated": true, "harvested": "2026-09-08", "id": "o-nitrotoluene", "quote_cas_number": "CAS No. 88-72-2", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - o-Nitrotoluene", "rel_mgm3": "11", "rel_ppm": "TWA 2", "source_quote": "NIOSH REL TWA 2 ppm (11 mg/m3) [skin]", "sources": ["https://www.cdc.gov/niosh/npg/npgd0462.html"], "stale_after": "2027-09-08", "substance": "o-Nitrotoluene", "title": "o-Nitrotoluene \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** o,o-Dimethyl o-(1,2-dibromo-2,2-dichloroethyl) phosphate; see Naled\n\n**CAS No.:** 300765\n\n> 300765 | | o,o-Dimethyl o-(1,2-dibromo-2,2-dichloroethyl) phosphate; see Naled\n\nSource: \n", "cas_number": "300765", "file": "o-o-dimethyl-o-1-2-dibromo-2-2-dichloroethyl-phosphate-see-naled.md", "generated": true, "harvested": "2026-08-05", "id": "o-o-dimethyl-o-1-2-dibromo-2-2-dichloroethyl-phosphate-see-naled", "source_quote": "300765 | | o,o-Dimethyl o-(1,2-dibromo-2,2-dichloroethyl) phosphate; see Naled", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "o,o-Dimethyl o-(1,2-dibromo-2,2-dichloroethyl) phosphate; see Naled", "title": "o,o-Dimethyl o-(1,2-dibromo-2,2-dichloroethyl) phosphate; see Naled \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** o-sec-Butylphenol\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - o-sec-Butylphenol\n\n**CAS No.:** 89-72-5\n\n> CAS No. 89-72-5\n\n**NIOSH REL (ppm):** TWA 5\n\n**NIOSH REL (mg/m\u00b3):** 30\n\n> NIOSH REL TWA 5 ppm (30 mg/m3) [skin]\n\nSource: \n", "cas_number": "89-72-5", "file": "o-sec-butylphenol-2.md", "generated": true, "harvested": "2026-09-08", "id": "o-sec-butylphenol-2", "quote_cas_number": "CAS No. 89-72-5", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - o-sec-Butylphenol", "rel_mgm3": "30", "rel_ppm": "TWA 5", "source_quote": "NIOSH REL TWA 5 ppm (30 mg/m3) [skin]", "sources": ["https://www.cdc.gov/niosh/npg/npgd0084.html"], "stale_after": "2027-09-08", "substance": "o-sec-Butylphenol", "title": "o-sec-Butylphenol \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** o-sec-Butylphenol\n\n**CAS No.:** 89725\n\n**PEL (ppm):** 5\n\n**PEL (mg/m\u00b3):** 30\n\n> 89725 | S | o-sec-Butylphenol | 5 | 30\n\nSource: \n", "cas_number": "89725", "file": "o-sec-butylphenol.md", "generated": true, "harvested": "2026-08-05", "id": "o-sec-butylphenol", "pel_mgm3": "30", "pel_ppm": "5", "source_quote": "89725 | S | o-sec-Butylphenol | 5 | 30", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "o-sec-Butylphenol", "title": "o-sec-Butylphenol \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** o-Terphenyl\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - o-Terphenyl\n\n**CAS No.:** 84-15-1\n\n> CAS No. 84-15-1\n\n**NIOSH REL (ppm):** 0.5\n\n**NIOSH REL (mg/m\u00b3):** C 5\n\n> NIOSH REL C 5 mg/m3 (0.5 ppm)\n\nSource: \n", "cas_number": "84-15-1", "file": "o-terphenyl.md", "generated": true, "harvested": "2026-09-08", "id": "o-terphenyl", "quote_cas_number": "CAS No. 84-15-1", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - o-Terphenyl", "rel_mgm3": "C 5", "rel_ppm": "0.5", "source_quote": "NIOSH REL C 5 mg/m3 (0.5 ppm)", "sources": ["https://www.cdc.gov/niosh/npg/npgd0591.html"], "stale_after": "2027-09-08", "substance": "o-Terphenyl", "title": "o-Terphenyl \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** o-Tolidine\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - o-Tolidine\n\n**CAS No.:** 119-93-7\n\n> CAS No. 119-93-7\n\n**NIOSH REL (mg/m\u00b3):** C 0.02\n\n> NIOSH REL Ca C 0.02 mg/m3 [60-minute] [skin]\n\nSource: \n", "cas_number": "119-93-7", "file": "o-tolidine.md", "generated": true, "harvested": "2026-09-08", "id": "o-tolidine", "quote_cas_number": "CAS No. 119-93-7", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - o-Tolidine", "rel_mgm3": "C 0.02", "source_quote": "NIOSH REL Ca C 0.02 mg/m3 [60-minute] [skin]", "sources": ["https://www.cdc.gov/niosh/npg/npgd0618.html"], "stale_after": "2027-09-08", "substance": "o-Tolidine", "title": "o-Tolidine \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** o-Toluidine\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - o-Toluidine\n\n**CAS No.:** 95-53-4\n\n> CAS No. 95-53-4\n\n**NIOSH REL, as stated:** Ca [skin] See Appendix A\n\n> NIOSH REL Ca [skin] See Appendix A\n\nSource: \n", "cas_number": "95-53-4", "file": "o-toluidine-2.md", "generated": true, "harvested": "2026-09-08", "id": "o-toluidine-2", "quote_cas_number": "CAS No. 95-53-4", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - o-Toluidine", "rel_statement": "Ca [skin] See Appendix A", "source_quote": "NIOSH REL Ca [skin] See Appendix A", "sources": ["https://www.cdc.gov/niosh/npg/npgd0622.html"], "stale_after": "2027-09-08", "substance": "o-Toluidine", "title": "o-Toluidine \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** o-Toluidine; o-methylaniline\n\n**CAS No.:** 95534\n\n**PEL (ppm):** 2\n\n**PEL (mg/m\u00b3):** 9\n\n> 95534 | S | o-Toluidine; o-methylaniline | 2 | 9\n\nSource: \n", "cas_number": "95534", "file": "o-toluidine-o-methylaniline.md", "generated": true, "harvested": "2026-08-05", "id": "o-toluidine-o-methylaniline", "pel_mgm3": "9", "pel_ppm": "2", "source_quote": "95534 | S | o-Toluidine; o-methylaniline | 2 | 9", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "o-Toluidine; o-methylaniline", "title": "o-Toluidine; o-methylaniline \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** o-Toluidine\n\n**CAS No.:** 95-53-4\n\n**PEL (ppm):** 5\n\n**PEL (mg/m\u00b3):** 22\n\n> o-Toluidine | 95-53-4 | 5 | 22 | X |\n\nSource: \n", "cas_number": "95-53-4", "file": "o-toluidine.md", "generated": true, "harvested": "2026-08-05", "id": "o-toluidine", "pel_mgm3": "22", "pel_ppm": "5", "source_quote": "o-Toluidine | 95-53-4 | 5 | 22 | X |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "o-Toluidine", "title": "o-Toluidine \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** o-Xylene\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - o-Xylene\n\n**CAS No.:** 95-47-6\n\n> CAS No. 95-47-6\n\n**NIOSH REL (ppm):** TWA 100\n\n**NIOSH REL (mg/m\u00b3):** 435\n\n> NIOSH REL TWA 100 ppm (435 mg/m3) ST 150 ppm (655 mg/m3)\n\nSource: \n", "cas_number": "95-47-6", "file": "o-xylene.md", "generated": true, "harvested": "2026-09-08", "id": "o-xylene", "quote_cas_number": "CAS No. 95-47-6", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - o-Xylene", "rel_mgm3": "435", "rel_ppm": "TWA 100", "source_quote": "NIOSH REL TWA 100 ppm (435 mg/m3) ST 150 ppm (655 mg/m3)", "sources": ["https://www.cdc.gov/niosh/npg/npgd0668.html"], "stale_after": "2027-09-08", "substance": "o-Xylene", "title": "o-Xylene \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Octachloronaphthalene\n\n**CAS No.:** 2234131\n\n**PEL (mg/m\u00b3):** 0.1\n\n**STEL (mg/m\u00b3):** 0.3\n\n> 2234131 | S | Octachloronaphthalene | -- | 0.1 | | -- | 0.3\n\nSource: \n", "cas_number": "2234131", "file": "octachloronaphthalene-2.md", "generated": true, "harvested": "2026-08-05", "id": "octachloronaphthalene-2", "pel_mgm3": "0.1", "source_quote": "2234131 | S | Octachloronaphthalene | -- | 0.1 | | -- | 0.3", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "stel_mgm3": "0.3", "substance": "Octachloronaphthalene", "title": "Octachloronaphthalene \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Octachloronaphthalene\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Octachloronaphthalene\n\n**CAS No.:** 2234-13-1\n\n> CAS No. 2234-13-1\n\n**NIOSH REL (mg/m\u00b3):** TWA 0.1\n\n> NIOSH REL TWA 0.1 mg/m3 ST 0.3 mg/m3 [skin]\n\nSource: \n", "cas_number": "2234-13-1", "file": "octachloronaphthalene-3.md", "generated": true, "harvested": "2026-09-08", "id": "octachloronaphthalene-3", "quote_cas_number": "CAS No. 2234-13-1", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Octachloronaphthalene", "rel_mgm3": "TWA 0.1", "source_quote": "NIOSH REL TWA 0.1 mg/m3 ST 0.3 mg/m3 [skin]", "sources": ["https://www.cdc.gov/niosh/npg/npgd0468.html"], "stale_after": "2027-09-08", "substance": "Octachloronaphthalene", "title": "Octachloronaphthalene \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Octachloronaphthalene\n\n**CAS No.:** 2234-13-1\n\n**PEL (mg/m\u00b3):** 0.1\n\n> Octachloronaphthalene | 2234-13-1 | - | 0.1 | X |\n\nSource: \n", "cas_number": "2234-13-1", "file": "octachloronaphthalene.md", "generated": true, "harvested": "2026-08-05", "id": "octachloronaphthalene", "pel_mgm3": "0.1", "source_quote": "Octachloronaphthalene | 2234-13-1 | - | 0.1 | X |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Octachloronaphthalene", "title": "Octachloronaphthalene \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Octane\n\n**CAS No.:** 111659\n\n**PEL (ppm):** 300\n\n**PEL (mg/m\u00b3):** 1,450\n\n**STEL (ppm):** 375\n\n**STEL (mg/m\u00b3):** 1800\n\n> 111659 | | Octane | 300 | 1,450 | | 375 | 1800\n\nSource: \n", "cas_number": "111659", "file": "octane-2.md", "generated": true, "harvested": "2026-08-05", "id": "octane-2", "pel_mgm3": "1,450", "pel_ppm": "300", "source_quote": "111659 | | Octane | 300 | 1,450 | | 375 | 1800", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "stel_mgm3": "1800", "stel_ppm": "375", "substance": "Octane", "title": "Octane \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Octane\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Octane\n\n**CAS No.:** 111-65-9\n\n> CAS No. 111-65-9\n\n**NIOSH REL (ppm):** TWA 75\n\n**NIOSH REL (mg/m\u00b3):** 350\n\n> NIOSH REL TWA 75 ppm (350 mg/m3) C 385 ppm (1800 mg/m3) [15-minute]\n\nSource: \n", "cas_number": "111-65-9", "file": "octane-3.md", "generated": true, "harvested": "2026-09-08", "id": "octane-3", "quote_cas_number": "CAS No. 111-65-9", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Octane", "rel_mgm3": "350", "rel_ppm": "TWA 75", "source_quote": "NIOSH REL TWA 75 ppm (350 mg/m3) C 385 ppm (1800 mg/m3) [15-minute]", "sources": ["https://www.cdc.gov/niosh/npg/npgd0470.html"], "stale_after": "2027-09-08", "substance": "Octane", "title": "Octane \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Octane\n\n**CAS No.:** 111-65-9\n\n**PEL (ppm):** 500\n\n**PEL (mg/m\u00b3):** 2350\n\n> Octane | 111-65-9 | 500 | 2350 | - |\n\nSource: \n", "cas_number": "111-65-9", "file": "octane.md", "generated": true, "harvested": "2026-08-05", "id": "octane", "pel_mgm3": "2350", "pel_ppm": "500", "source_quote": "Octane | 111-65-9 | 500 | 2350 | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Octane", "title": "Octane \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Oil (mineral) mist, particulate\n\n**CAS No.:** 8012951\n\n**PEL (mg/m\u00b3):** (5)(l)\n\n> 8012951 | | Oil (mineral) mist, particulate | -- | (5)(l)\n\nSource: \n", "cas_number": "8012951", "file": "oil-mineral-mist-particulate.md", "generated": true, "harvested": "2026-08-05", "id": "oil-mineral-mist-particulate", "pel_mgm3": "(5)(l)", "source_quote": "8012951 | | Oil (mineral) mist, particulate | -- | (5)(l)", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Oil (mineral) mist, particulate", "title": "Oil (mineral) mist, particulate \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Oil mist (mineral)\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Oil mist (mineral)\n\n**CAS No.:** 8012-95-1\n\n> CAS No. 8012-95-1\n\n**NIOSH REL (mg/m\u00b3):** TWA 5\n\n> NIOSH REL TWA 5 mg/m3 ST 10 mg/m3\n\nSource: \n", "cas_number": "8012-95-1", "file": "oil-mist-mineral-2.md", "generated": true, "harvested": "2026-09-08", "id": "oil-mist-mineral-2", "quote_cas_number": "CAS No. 8012-95-1", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Oil mist (mineral)", "rel_mgm3": "TWA 5", "source_quote": "NIOSH REL TWA 5 mg/m3 ST 10 mg/m3", "sources": ["https://www.cdc.gov/niosh/npg/npgd0472.html"], "stale_after": "2027-09-08", "substance": "Oil mist (mineral)", "title": "Oil mist (mineral) \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Oil mist, mineral\n\n**CAS No.:** 8012-95-1\n\n**PEL (mg/m\u00b3):** 5\n\n> Oil mist, mineral | 8012-95-1 | - | 5 | - |\n\nSource: \n", "cas_number": "8012-95-1", "file": "oil-mist-mineral.md", "generated": true, "harvested": "2026-08-05", "id": "oil-mist-mineral", "pel_mgm3": "5", "source_quote": "Oil mist, mineral | 8012-95-1 | - | 5 | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Oil mist, mineral", "title": "Oil mist, mineral \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** (ortho)\n\n**CAS No.:** 528-29-0\n\n> (ortho) | 528-29-0 | - | - | - |\n\nSource: \n", "cas_number": "528-29-0", "file": "ortho.md", "generated": true, "harvested": "2026-08-05", "id": "ortho", "source_quote": "(ortho) | 528-29-0 | - | - | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "(ortho)", "title": "(ortho) \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Osmium tetroxide, as Os\n\n**CAS No.:** 20816120\n\n**PEL (ppm):** 0.0002\n\n**PEL (mg/m\u00b3):** 0.002\n\n**STEL (ppm):** 0.0006\n\n**STEL (mg/m\u00b3):** 0.006\n\n> 20816120 | | Osmium tetroxide, as Os | 0.0002 | 0.002 | | 0.0006 | 0.006\n\nSource: \n", "cas_number": "20816120", "file": "osmium-tetroxide-as-os-2.md", "generated": true, "harvested": "2026-08-05", "id": "osmium-tetroxide-as-os-2", "pel_mgm3": "0.002", "pel_ppm": "0.0002", "source_quote": "20816120 | | Osmium tetroxide, as Os | 0.0002 | 0.002 | | 0.0006 | 0.006", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "stel_mgm3": "0.006", "stel_ppm": "0.0006", "substance": "Osmium tetroxide, as Os", "title": "Osmium tetroxide, as Os \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Osmium tetroxide (as Os)\n\n**CAS No.:** 20816-12-0\n\n**PEL (mg/m\u00b3):** 0.002\n\n> Osmium tetroxide (as Os) | 20816-12-0 | - | 0.002 | - |\n\nSource: \n", "cas_number": "20816-12-0", "file": "osmium-tetroxide-as-os.md", "generated": true, "harvested": "2026-08-05", "id": "osmium-tetroxide-as-os", "pel_mgm3": "0.002", "source_quote": "Osmium tetroxide (as Os) | 20816-12-0 | - | 0.002 | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Osmium tetroxide (as Os)", "title": "Osmium tetroxide (as Os) \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Osmium tetroxide\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Osmium tetroxide\n\n**CAS No.:** 20816-12-0\n\n> CAS No. 20816-12-0\n\n**NIOSH REL (ppm):** 0.0002\n\n**NIOSH REL (mg/m\u00b3):** TWA 0.002\n\n> NIOSH REL TWA 0.002 mg/m3 (0.0002 ppm) ST 0.006 mg/m3 (0.0006 ppm)\n\nSource: \n", "cas_number": "20816-12-0", "file": "osmium-tetroxide.md", "generated": true, "harvested": "2026-09-08", "id": "osmium-tetroxide", "quote_cas_number": "CAS No. 20816-12-0", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Osmium tetroxide", "rel_mgm3": "TWA 0.002", "rel_ppm": "0.0002", "source_quote": "NIOSH REL TWA 0.002 mg/m3 (0.0002 ppm) ST 0.006 mg/m3 (0.0006 ppm)", "sources": ["https://www.cdc.gov/niosh/npg/npgd0473.html"], "stale_after": "2027-09-08", "substance": "Osmium tetroxide", "title": "Osmium tetroxide \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Oxalic acid\n\n**CAS No.:** 144627\n\n**PEL (mg/m\u00b3):** 1\n\n**STEL (mg/m\u00b3):** 2\n\n> 144627 | | Oxalic acid | -- | 1 | | -- | 2\n\nSource: \n", "cas_number": "144627", "file": "oxalic-acid-2.md", "generated": true, "harvested": "2026-08-05", "id": "oxalic-acid-2", "pel_mgm3": "1", "source_quote": "144627 | | Oxalic acid | -- | 1 | | -- | 2", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "stel_mgm3": "2", "substance": "Oxalic acid", "title": "Oxalic acid \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Oxalic acid\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Oxalic acid\n\n**CAS No.:** 144-62-7\n\n> CAS No. 144-62-7\n\n**NIOSH REL (mg/m\u00b3):** TWA 1\n\n> NIOSH REL TWA 1 mg/m3 ST 2 mg/m3\n\nSource: \n", "cas_number": "144-62-7", "file": "oxalic-acid-3.md", "generated": true, "harvested": "2026-09-08", "id": "oxalic-acid-3", "quote_cas_number": "CAS No. 144-62-7", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Oxalic acid", "rel_mgm3": "TWA 1", "source_quote": "NIOSH REL TWA 1 mg/m3 ST 2 mg/m3", "sources": ["https://www.cdc.gov/niosh/npg/npgd0474.html"], "stale_after": "2027-09-08", "substance": "Oxalic acid", "title": "Oxalic acid \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Oxalic acid\n\n**CAS No.:** 144-62-7\n\n**PEL (mg/m\u00b3):** 1\n\n> Oxalic acid | 144-62-7 | - | 1 | - |\n\nSource: \n", "cas_number": "144-62-7", "file": "oxalic-acid.md", "generated": true, "harvested": "2026-08-05", "id": "oxalic-acid", "pel_mgm3": "1", "source_quote": "Oxalic acid | 144-62-7 | - | 1 | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Oxalic acid", "title": "Oxalic acid \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Oxygen difluoride\n\n**CAS No.:** 7783417\n\n**PEL (ppm):** 0.05\n\n**PEL (mg/m\u00b3):** 0.1\n\n**Ceiling:** C\n\n> 7783417 | | Oxygen difluoride | 0.05 | 0.1 | C\n\nSource: \n", "cas_number": "7783417", "ceiling": "C", "file": "oxygen-difluoride-2.md", "generated": true, "harvested": "2026-08-05", "id": "oxygen-difluoride-2", "pel_mgm3": "0.1", "pel_ppm": "0.05", "source_quote": "7783417 | | Oxygen difluoride | 0.05 | 0.1 | C", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Oxygen difluoride", "title": "Oxygen difluoride \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Oxygen difluoride\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Oxygen difluoride\n\n**CAS No.:** 7783-41-7\n\n> CAS No. 7783-41-7\n\n**NIOSH REL (ppm):** C 0.05\n\n**NIOSH REL (mg/m\u00b3):** 0.1\n\n> NIOSH REL C 0.05 ppm (0.1 mg/m3)\n\nSource: \n", "cas_number": "7783-41-7", "file": "oxygen-difluoride-3.md", "generated": true, "harvested": "2026-09-08", "id": "oxygen-difluoride-3", "quote_cas_number": "CAS No. 7783-41-7", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Oxygen difluoride", "rel_mgm3": "0.1", "rel_ppm": "C 0.05", "source_quote": "NIOSH REL C 0.05 ppm (0.1 mg/m3)", "sources": ["https://www.cdc.gov/niosh/npg/npgd0475.html"], "stale_after": "2027-09-08", "substance": "Oxygen difluoride", "title": "Oxygen difluoride \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Oxygen difluoride\n\n**CAS No.:** 7783-41-7\n\n**PEL (ppm):** 0.05\n\n**PEL (mg/m\u00b3):** 0.1\n\n> Oxygen difluoride | 7783-41-7 | 0.05 | 0.1 | - |\n\nSource: \n", "cas_number": "7783-41-7", "file": "oxygen-difluoride.md", "generated": true, "harvested": "2026-08-05", "id": "oxygen-difluoride", "pel_mgm3": "0.1", "pel_ppm": "0.05", "source_quote": "Oxygen difluoride | 7783-41-7 | 0.05 | 0.1 | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Oxygen difluoride", "title": "Oxygen difluoride \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Ozone\n\n**CAS No.:** 10028156\n\n**PEL (ppm):** 0.1\n\n**PEL (mg/m\u00b3):** 0.2\n\n**STEL (ppm):** 0.3\n\n**STEL (mg/m\u00b3):** 0.6\n\n> 10028156 | | Ozone | 0.1 | 0.2 | | 0.3 | 0.6\n\nSource: \n", "cas_number": "10028156", "file": "ozone-2.md", "generated": true, "harvested": "2026-08-05", "id": "ozone-2", "pel_mgm3": "0.2", "pel_ppm": "0.1", "source_quote": "10028156 | | Ozone | 0.1 | 0.2 | | 0.3 | 0.6", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "stel_mgm3": "0.6", "stel_ppm": "0.3", "substance": "Ozone", "title": "Ozone \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Ozone\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Ozone\n\n**CAS No.:** 10028-15-6\n\n> CAS No. 10028-15-6\n\n**NIOSH REL (ppm):** C 0.1\n\n**NIOSH REL (mg/m\u00b3):** 0.2\n\n> NIOSH REL C 0.1 ppm (0.2 mg/m3)\n\nSource: \n", "cas_number": "10028-15-6", "file": "ozone-3.md", "generated": true, "harvested": "2026-09-08", "id": "ozone-3", "quote_cas_number": "CAS No. 10028-15-6", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Ozone", "rel_mgm3": "0.2", "rel_ppm": "C 0.1", "source_quote": "NIOSH REL C 0.1 ppm (0.2 mg/m3)", "sources": ["https://www.cdc.gov/niosh/npg/npgd0476.html"], "stale_after": "2027-09-08", "substance": "Ozone", "title": "Ozone \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Ozone\n\n**CAS No.:** 10028-15-6\n\n**PEL (ppm):** 0.1\n\n**PEL (mg/m\u00b3):** 0.2\n\n> Ozone | 10028-15-6 | 0.1 | 0.2 | - |\n\nSource: \n", "cas_number": "10028-15-6", "file": "ozone.md", "generated": true, "harvested": "2026-08-05", "id": "ozone", "pel_mgm3": "0.2", "pel_ppm": "0.1", "source_quote": "Ozone | 10028-15-6 | 0.1 | 0.2 | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Ozone", "title": "Ozone \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** p-Anisidine\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - p-Anisidine\n\n**CAS No.:** 104-94-9\n\n> CAS No. 104-94-9\n\n**NIOSH REL (mg/m\u00b3):** TWA 0.5\n\n> NIOSH REL TWA 0.5 mg/m3 [skin]\n\nSource: \n", "cas_number": "104-94-9", "file": "p-anisidine.md", "generated": true, "harvested": "2026-09-08", "id": "p-anisidine", "quote_cas_number": "CAS No. 104-94-9", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - p-Anisidine", "rel_mgm3": "TWA 0.5", "source_quote": "NIOSH REL TWA 0.5 mg/m3 [skin]", "sources": ["https://www.cdc.gov/niosh/npg/npgd0035.html"], "stale_after": "2027-09-08", "substance": "p-Anisidine", "title": "p-Anisidine \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** p-Cresol\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - p-Cresol\n\n**CAS No.:** 106-44-5\n\n> CAS No. 106-44-5\n\n**NIOSH REL (ppm):** TWA 2.3\n\n**NIOSH REL (mg/m\u00b3):** 10\n\n> NIOSH REL TWA 2.3 ppm (10 mg/m3)\n\nSource: \n", "cas_number": "106-44-5", "file": "p-cresol.md", "generated": true, "harvested": "2026-09-08", "id": "p-cresol", "quote_cas_number": "CAS No. 106-44-5", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - p-Cresol", "rel_mgm3": "10", "rel_ppm": "TWA 2.3", "source_quote": "NIOSH REL TWA 2.3 ppm (10 mg/m3)", "sources": ["https://www.cdc.gov/niosh/npg/npgd0156.html"], "stale_after": "2027-09-08", "substance": "p-Cresol", "title": "p-Cresol \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** p-Dichlorobenzene; 1,4-dichlorobenzene\n\n**CAS No.:** 106467\n\n**PEL (ppm):** 10\n\n**PEL (mg/m\u00b3):** 60\n\n**Ceiling:** 200 ppm\n\n**STEL (ppm):** 110\n\n**STEL (mg/m\u00b3):** 675\n\n> 106467 | | p-Dichlorobenzene; 1,4-dichlorobenzene | 10 | 60 | 200 ppm | 110 | 675\n\nSource: \n", "cas_number": "106467", "ceiling": "200 ppm", "file": "p-dichlorobenzene-1-4-dichlorobenzene.md", "generated": true, "harvested": "2026-08-05", "id": "p-dichlorobenzene-1-4-dichlorobenzene", "pel_mgm3": "60", "pel_ppm": "10", "source_quote": "106467 | | p-Dichlorobenzene; 1,4-dichlorobenzene | 10 | 60 | 200 ppm | 110 | 675", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "stel_mgm3": "675", "stel_ppm": "110", "substance": "p-Dichlorobenzene; 1,4-dichlorobenzene", "title": "p-Dichlorobenzene; 1,4-dichlorobenzene \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** p-Dichlorobenzene\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - p-Dichlorobenzene\n\n**CAS No.:** 106-46-7\n\n> CAS No. 106-46-7\n\n**NIOSH REL, as stated:** Ca See Appendix A\n\n> NIOSH REL Ca See Appendix A\n\nSource: \n", "cas_number": "106-46-7", "file": "p-dichlorobenzene-2.md", "generated": true, "harvested": "2026-09-08", "id": "p-dichlorobenzene-2", "quote_cas_number": "CAS No. 106-46-7", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - p-Dichlorobenzene", "rel_statement": "Ca See Appendix A", "source_quote": "NIOSH REL Ca See Appendix A", "sources": ["https://www.cdc.gov/niosh/npg/npgd0190.html"], "stale_after": "2027-09-08", "substance": "p-Dichlorobenzene", "title": "p-Dichlorobenzene \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** p-Dichlorobenzene\n\n**CAS No.:** 106-46-7\n\n**PEL (ppm):** 75\n\n**PEL (mg/m\u00b3):** 450\n\n> p-Dichlorobenzene | 106-46-7 | 75 | 450 | - |\n\nSource: \n", "cas_number": "106-46-7", "file": "p-dichlorobenzene.md", "generated": true, "harvested": "2026-08-05", "id": "p-dichlorobenzene", "pel_mgm3": "450", "pel_ppm": "75", "source_quote": "p-Dichlorobenzene | 106-46-7 | 75 | 450 | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "p-Dichlorobenzene", "title": "p-Dichlorobenzene \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** p-Dihydroxybenzene; see Hydroquinone\n\n**CAS No.:** 123319\n\n> 123319 | | p-Dihydroxybenzene; see Hydroquinone\n\nSource: \n", "cas_number": "123319", "file": "p-dihydroxybenzene-see-hydroquinone.md", "generated": true, "harvested": "2026-08-05", "id": "p-dihydroxybenzene-see-hydroquinone", "source_quote": "123319 | | p-Dihydroxybenzene; see Hydroquinone", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "p-Dihydroxybenzene; see Hydroquinone", "title": "p-Dihydroxybenzene; see Hydroquinone \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** p-Dinitrobenzene\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - p-Dinitrobenzene\n\n**CAS No.:** 100-25-4\n\n> CAS No. 100-25-4\n\n**NIOSH REL (mg/m\u00b3):** TWA 1\n\n> NIOSH REL TWA 1 mg/m3 [skin]\n\nSource: \n", "cas_number": "100-25-4", "file": "p-dinitrobenzene.md", "generated": true, "harvested": "2026-09-08", "id": "p-dinitrobenzene", "quote_cas_number": "CAS No. 100-25-4", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - p-Dinitrobenzene", "rel_mgm3": "TWA 1", "source_quote": "NIOSH REL TWA 1 mg/m3 [skin]", "sources": ["https://www.cdc.gov/niosh/npg/npgd0233.html"], "stale_after": "2027-09-08", "substance": "p-Dinitrobenzene", "title": "p-Dinitrobenzene \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** p-Dioxane;\n\n**CAS No.:** 123911\n\n> 123911 | S | p-Dioxane;\n\nSource: \n", "cas_number": "123911", "file": "p-dioxane.md", "generated": true, "harvested": "2026-08-05", "id": "p-dioxane", "source_quote": "123911 | S | p-Dioxane;", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "p-Dioxane;", "title": "p-Dioxane; \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** p-isomer\n\n**CAS No.:** 99-99-0\n\n> p-isomer | 99-99-0 | - | - | - |\n\nSource: \n", "cas_number": "99-99-0", "file": "p-isomer.md", "generated": true, "harvested": "2026-08-05", "id": "p-isomer", "source_quote": "p-isomer | 99-99-0 | - | - | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "p-isomer", "title": "p-isomer \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** p-Nitroaniline\n\n**CAS No.:** 100016\n\n**PEL (mg/m\u00b3):** 3\n\n> 100016 | S | p-Nitroaniline | -- | 3\n\nSource: \n", "cas_number": "100016", "file": "p-nitroaniline-2.md", "generated": true, "harvested": "2026-08-05", "id": "p-nitroaniline-2", "pel_mgm3": "3", "source_quote": "100016 | S | p-Nitroaniline | -- | 3", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "p-Nitroaniline", "title": "p-Nitroaniline \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** p-Nitroaniline\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - p-Nitroaniline\n\n**CAS No.:** 100-01-6\n\n> CAS No. 100-01-6\n\n**NIOSH REL (mg/m\u00b3):** TWA 3\n\n> NIOSH REL TWA 3 mg/m3 [skin]\n\nSource: \n", "cas_number": "100-01-6", "file": "p-nitroaniline-3.md", "generated": true, "harvested": "2026-09-08", "id": "p-nitroaniline-3", "quote_cas_number": "CAS No. 100-01-6", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - p-Nitroaniline", "rel_mgm3": "TWA 3", "source_quote": "NIOSH REL TWA 3 mg/m3 [skin]", "sources": ["https://www.cdc.gov/niosh/npg/npgd0449.html"], "stale_after": "2027-09-08", "substance": "p-Nitroaniline", "title": "p-Nitroaniline \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** p-Nitroaniline\n\n**CAS No.:** 100-01-6\n\n**PEL (ppm):** 1\n\n**PEL (mg/m\u00b3):** 6\n\n> p-Nitroaniline | 100-01-6 | 1 | 6 | X |\n\nSource: \n", "cas_number": "100-01-6", "file": "p-nitroaniline.md", "generated": true, "harvested": "2026-08-05", "id": "p-nitroaniline", "pel_mgm3": "6", "pel_ppm": "1", "source_quote": "p-Nitroaniline | 100-01-6 | 1 | 6 | X |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "p-Nitroaniline", "title": "p-Nitroaniline \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** p-Nitrochlorobenzene; 1-chloro-4-nitrobenzene\n\n**CAS No.:** 100005\n\n**PEL (ppm):** 0.1\n\n**PEL (mg/m\u00b3):** 0.64\n\n> 100005 | S | p-Nitrochlorobenzene; 1-chloro-4-nitrobenzene | 0.1 | 0.64\n\nSource: \n", "cas_number": "100005", "file": "p-nitrochlorobenzene-1-chloro-4-nitrobenzene.md", "generated": true, "harvested": "2026-08-05", "id": "p-nitrochlorobenzene-1-chloro-4-nitrobenzene", "pel_mgm3": "0.64", "pel_ppm": "0.1", "source_quote": "100005 | S | p-Nitrochlorobenzene; 1-chloro-4-nitrobenzene | 0.1 | 0.64", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "p-Nitrochlorobenzene; 1-chloro-4-nitrobenzene", "title": "p-Nitrochlorobenzene; 1-chloro-4-nitrobenzene \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** p-Nitrochlorobenzene\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - p-Nitrochlorobenzene\n\n**CAS No.:** 100-00-5\n\n> CAS No. 100-00-5\n\n**NIOSH REL, as stated:** Ca See Appendix A [skin]\n\n> NIOSH REL Ca See Appendix A [skin]\n\nSource: \n", "cas_number": "100-00-5", "file": "p-nitrochlorobenzene-2.md", "generated": true, "harvested": "2026-09-08", "id": "p-nitrochlorobenzene-2", "quote_cas_number": "CAS No. 100-00-5", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - p-Nitrochlorobenzene", "rel_statement": "Ca See Appendix A [skin]", "source_quote": "NIOSH REL Ca See Appendix A [skin]", "sources": ["https://www.cdc.gov/niosh/npg/npgd0452.html"], "stale_after": "2027-09-08", "substance": "p-Nitrochlorobenzene", "title": "p-Nitrochlorobenzene \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** p-Nitrochlorobenzene\n\n**CAS No.:** 100-00-5\n\n**PEL (mg/m\u00b3):** 1\n\n> p-Nitrochlorobenzene | 100-00-5 | - | 1 | X |\n\nSource: \n", "cas_number": "100-00-5", "file": "p-nitrochlorobenzene.md", "generated": true, "harvested": "2026-08-05", "id": "p-nitrochlorobenzene", "pel_mgm3": "1", "source_quote": "p-Nitrochlorobenzene | 100-00-5 | - | 1 | X |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "p-Nitrochlorobenzene", "title": "p-Nitrochlorobenzene \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** p-Nitrotoluene\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - p-Nitrotoluene\n\n**CAS No.:** 99-99-0\n\n> CAS No. 99-99-0\n\n**NIOSH REL (ppm):** TWA 2\n\n**NIOSH REL (mg/m\u00b3):** 11\n\n> NIOSH REL TWA 2 ppm (11 mg/m3) [skin]\n\nSource: \n", "cas_number": "99-99-0", "file": "p-nitrotoluene.md", "generated": true, "harvested": "2026-09-08", "id": "p-nitrotoluene", "quote_cas_number": "CAS No. 99-99-0", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - p-Nitrotoluene", "rel_mgm3": "11", "rel_ppm": "TWA 2", "source_quote": "NIOSH REL TWA 2 ppm (11 mg/m3) [skin]", "sources": ["https://www.cdc.gov/niosh/npg/npgd0464.html"], "stale_after": "2027-09-08", "substance": "p-Nitrotoluene", "title": "p-Nitrotoluene \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** p-Phenylene diamine\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - p-Phenylene diamine\n\n**CAS No.:** 106-50-3\n\n> CAS No. 106-50-3\n\n**NIOSH REL (mg/m\u00b3):** TWA 0.1\n\n> NIOSH REL TWA 0.1 mg/m3 [skin]\n\nSource: \n", "cas_number": "106-50-3", "file": "p-phenylene-diamine-2.md", "generated": true, "harvested": "2026-09-08", "id": "p-phenylene-diamine-2", "quote_cas_number": "CAS No. 106-50-3", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - p-Phenylene diamine", "rel_mgm3": "TWA 0.1", "source_quote": "NIOSH REL TWA 0.1 mg/m3 [skin]", "sources": ["https://www.cdc.gov/niosh/npg/npgd0495.html"], "stale_after": "2027-09-08", "substance": "p-Phenylene diamine", "title": "p-Phenylene diamine \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** p-Phenylene diamine\n\n**CAS No.:** 106-50-3\n\n**PEL (mg/m\u00b3):** 0.1\n\n> p-Phenylene diamine | 106-50-3 | - | 0.1 | X |\n\nSource: \n", "cas_number": "106-50-3", "file": "p-phenylene-diamine.md", "generated": true, "harvested": "2026-08-05", "id": "p-phenylene-diamine", "pel_mgm3": "0.1", "source_quote": "p-Phenylene diamine | 106-50-3 | - | 0.1 | X |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "p-Phenylene diamine", "title": "p-Phenylene diamine \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** p-Phenylenediamine\n\n**CAS No.:** 106503\n\n**PEL (mg/m\u00b3):** 0.1\n\n> 106503 | S | p-Phenylenediamine | -- | 0.1\n\nSource: \n", "cas_number": "106503", "file": "p-phenylenediamine.md", "generated": true, "harvested": "2026-08-05", "id": "p-phenylenediamine", "pel_mgm3": "0.1", "source_quote": "106503 | S | p-Phenylenediamine | -- | 0.1", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "p-Phenylenediamine", "title": "p-Phenylenediamine \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** p-Terphenyl\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - p-Terphenyl\n\n**CAS No.:** 92-94-4\n\n> CAS No. 92-94-4\n\n**NIOSH REL (ppm):** 0.5\n\n**NIOSH REL (mg/m\u00b3):** C 5\n\n> NIOSH REL C 5 mg/m3 (0.5 ppm)\n\nSource: \n", "cas_number": "92-94-4", "file": "p-terphenyl.md", "generated": true, "harvested": "2026-09-08", "id": "p-terphenyl", "quote_cas_number": "CAS No. 92-94-4", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - p-Terphenyl", "rel_mgm3": "C 5", "rel_ppm": "0.5", "source_quote": "NIOSH REL C 5 mg/m3 (0.5 ppm)", "sources": ["https://www.cdc.gov/niosh/npg/npgd0593.html"], "stale_after": "2027-09-08", "substance": "p-Terphenyl", "title": "p-Terphenyl \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** p-tert-Butyltoluene\n\n**CAS No.:** 98511\n\n**PEL (ppm):** 1\n\n**PEL (mg/m\u00b3):** 6.1\n\n**STEL (ppm):** 20\n\n**STEL (mg/m\u00b3):** 120\n\n> 98511 | | p-tert-Butyltoluene | 1 | 6.1 | | 20 | 120\n\nSource: \n", "cas_number": "98511", "file": "p-tert-butyltoluene-2.md", "generated": true, "harvested": "2026-08-05", "id": "p-tert-butyltoluene-2", "pel_mgm3": "6.1", "pel_ppm": "1", "source_quote": "98511 | | p-tert-Butyltoluene | 1 | 6.1 | | 20 | 120", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "stel_mgm3": "120", "stel_ppm": "20", "substance": "p-tert-Butyltoluene", "title": "p-tert-Butyltoluene \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** p-tert-Butyltoluene\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - p-tert-Butyltoluene\n\n**CAS No.:** 98-51-1\n\n> CAS No. 98-51-1\n\n**NIOSH REL (ppm):** TWA 10\n\n**NIOSH REL (mg/m\u00b3):** 60\n\n> NIOSH REL TWA 10 ppm (60 mg/m3) ST 20 ppm (120 mg/m3)\n\nSource: \n", "cas_number": "98-51-1", "file": "p-tert-butyltoluene-3.md", "generated": true, "harvested": "2026-09-08", "id": "p-tert-butyltoluene-3", "quote_cas_number": "CAS No. 98-51-1", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - p-tert-Butyltoluene", "rel_mgm3": "60", "rel_ppm": "TWA 10", "source_quote": "NIOSH REL TWA 10 ppm (60 mg/m3) ST 20 ppm (120 mg/m3)", "sources": ["https://www.cdc.gov/niosh/npg/npgd0085.html"], "stale_after": "2027-09-08", "substance": "p-tert-Butyltoluene", "title": "p-tert-Butyltoluene \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** p-tert-Butyltoluene\n\n**CAS No.:** 98-51-1\n\n**PEL (ppm):** 10\n\n**PEL (mg/m\u00b3):** 60\n\n> p-tert-Butyltoluene | 98-51-1 | 10 | 60 | - |\n\nSource: \n", "cas_number": "98-51-1", "file": "p-tert-butyltoluene.md", "generated": true, "harvested": "2026-08-05", "id": "p-tert-butyltoluene", "pel_mgm3": "60", "pel_ppm": "10", "source_quote": "p-tert-Butyltoluene | 98-51-1 | 10 | 60 | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "p-tert-Butyltoluene", "title": "p-tert-Butyltoluene \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** p-Toluidine\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - p-Toluidine\n\n**CAS No.:** 106-49-0\n\n> CAS No. 106-49-0\n\n**NIOSH REL, as stated:** Ca See Appendix A\n\n> NIOSH REL Ca See Appendix A\n\nSource: \n", "cas_number": "106-49-0", "file": "p-toluidine-2.md", "generated": true, "harvested": "2026-09-08", "id": "p-toluidine-2", "quote_cas_number": "CAS No. 106-49-0", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - p-Toluidine", "rel_statement": "Ca See Appendix A", "source_quote": "NIOSH REL Ca See Appendix A", "sources": ["https://www.cdc.gov/niosh/npg/npgd0624.html"], "stale_after": "2027-09-08", "substance": "p-Toluidine", "title": "p-Toluidine \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** p-Toluidine\n\n**CAS No.:** 106490\n\n**PEL (ppm):** 2\n\n**PEL (mg/m\u00b3):** 9\n\n> 106490 | S | p-Toluidine | 2 | 9\n\nSource: \n", "cas_number": "106490", "file": "p-toluidine.md", "generated": true, "harvested": "2026-08-05", "id": "p-toluidine", "pel_mgm3": "9", "pel_ppm": "2", "source_quote": "106490 | S | p-Toluidine | 2 | 9", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "p-Toluidine", "title": "p-Toluidine \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** p-Xylene\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - p-Xylene\n\n**CAS No.:** 106-42-3\n\n> CAS No. 106-42-3\n\n**NIOSH REL (ppm):** TWA 100\n\n**NIOSH REL (mg/m\u00b3):** 435\n\n> NIOSH REL TWA 100 ppm (435 mg/m3) ST 150 ppm (655 mg/m3)\n\nSource: \n", "cas_number": "106-42-3", "file": "p-xylene.md", "generated": true, "harvested": "2026-09-08", "id": "p-xylene", "quote_cas_number": "CAS No. 106-42-3", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - p-Xylene", "rel_mgm3": "435", "rel_ppm": "TWA 100", "source_quote": "NIOSH REL TWA 100 ppm (435 mg/m3) ST 150 ppm (655 mg/m3)", "sources": ["https://www.cdc.gov/niosh/npg/npgd0670.html"], "stale_after": "2027-09-08", "substance": "p-Xylene", "title": "p-Xylene \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** (para)\n\n**CAS No.:** 100-25-4\n\n> (para) | 100-25-4 | - | - | - |\n\nSource: \n", "cas_number": "100-25-4", "file": "para.md", "generated": true, "harvested": "2026-08-05", "id": "para", "source_quote": "(para) | 100-25-4 | - | - | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "(para)", "title": "(para) \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Paraffin wax fume\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Paraffin wax fume\n\n**CAS No.:** 8002-74-2\n\n> CAS No. 8002-74-2\n\n**NIOSH REL (mg/m\u00b3):** TWA 2\n\n> NIOSH REL TWA 2 mg/m3\n\nSource: \n", "cas_number": "8002-74-2", "file": "paraffin-wax-fume-2.md", "generated": true, "harvested": "2026-09-08", "id": "paraffin-wax-fume-2", "quote_cas_number": "CAS No. 8002-74-2", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Paraffin wax fume", "rel_mgm3": "TWA 2", "source_quote": "NIOSH REL TWA 2 mg/m3", "sources": ["https://www.cdc.gov/niosh/npg/npgd0477.html"], "stale_after": "2027-09-08", "substance": "Paraffin wax fume", "title": "Paraffin wax fume \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Paraffin wax fume\n\n**CAS No.:** 8002742\n\n**PEL (mg/m\u00b3):** 2\n\n> 8002742 | | Paraffin wax fume | -- | 2\n\nSource: \n", "cas_number": "8002742", "file": "paraffin-wax-fume.md", "generated": true, "harvested": "2026-08-05", "id": "paraffin-wax-fume", "pel_mgm3": "2", "source_quote": "8002742 | | Paraffin wax fume | -- | 2", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Paraffin wax fume", "title": "Paraffin wax fume \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Paraquat (Paraquat dichloride)\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Paraquat (Paraquat dichloride)\n\n**CAS No.:** 1910-42-5\n\n> CAS No. 1910-42-5\n\n**NIOSH REL, as stated:** TWA 0.1 mg/m3 (resp) [skin]\n\n> NIOSH REL TWA 0.1 mg/m3 (resp) [skin]\n\nSource: \n", "cas_number": "1910-42-5", "file": "paraquat-paraquat-dichloride.md", "generated": true, "harvested": "2026-09-08", "id": "paraquat-paraquat-dichloride", "quote_cas_number": "CAS No. 1910-42-5", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Paraquat (Paraquat dichloride)", "rel_statement": "TWA 0.1 mg/m3 (resp) [skin]", "source_quote": "NIOSH REL TWA 0.1 mg/m3 (resp) [skin]", "sources": ["https://www.cdc.gov/niosh/npg/npgd0478.html"], "stale_after": "2027-09-08", "substance": "Paraquat (Paraquat dichloride)", "title": "Paraquat (Paraquat dichloride) \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Parathion\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Parathion\n\n**CAS No.:** 56-38-2\n\n> CAS No. 56-38-2\n\n**NIOSH REL (mg/m\u00b3):** TWA 0.05\n\n> NIOSH REL TWA 0.05 mg/m3 [skin]\n\nSource: \n", "cas_number": "56-38-2", "file": "parathion-2.md", "generated": true, "harvested": "2026-09-08", "id": "parathion-2", "quote_cas_number": "CAS No. 56-38-2", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Parathion", "rel_mgm3": "TWA 0.05", "source_quote": "NIOSH REL TWA 0.05 mg/m3 [skin]", "sources": ["https://www.cdc.gov/niosh/npg/npgd0479.html"], "stale_after": "2027-09-08", "substance": "Parathion", "title": "Parathion \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Parathion; o,o-diethyl o-(p-nitrophenyl) phosphorothioate\n\n**CAS No.:** 56382\n\n**PEL (mg/m\u00b3):** 0.1\n\n> 56382 | S | Parathion; o,o-diethyl o-(p-nitrophenyl) phosphorothioate | -- | 0.1\n\nSource: \n", "cas_number": "56382", "file": "parathion-o-o-diethyl-o-p-nitrophenyl-phosphorothioate.md", "generated": true, "harvested": "2026-08-05", "id": "parathion-o-o-diethyl-o-p-nitrophenyl-phosphorothioate", "pel_mgm3": "0.1", "source_quote": "56382 | S | Parathion; o,o-diethyl o-(p-nitrophenyl) phosphorothioate | -- | 0.1", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Parathion; o,o-diethyl o-(p-nitrophenyl) phosphorothioate", "title": "Parathion; o,o-diethyl o-(p-nitrophenyl) phosphorothioate \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Parathion\n\n**CAS No.:** 56-38-2\n\n**PEL (mg/m\u00b3):** 0.1\n\n> Parathion | 56-38-2 | - | 0.1 | X |\n\nSource: \n", "cas_number": "56-38-2", "file": "parathion.md", "generated": true, "harvested": "2026-08-05", "id": "parathion", "pel_mgm3": "0.1", "source_quote": "Parathion | 56-38-2 | - | 0.1 | X |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Parathion", "title": "Parathion \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** PCP; see Pentachlorophenol\n\n**CAS No.:** 87865\n\n> 87865 | S | PCP; see Pentachlorophenol\n\nSource: \n", "cas_number": "87865", "file": "pcp-see-pentachlorophenol.md", "generated": true, "harvested": "2026-08-05", "id": "pcp-see-pentachlorophenol", "source_quote": "87865 | S | PCP; see Pentachlorophenol", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "PCP; see Pentachlorophenol", "title": "PCP; see Pentachlorophenol \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Pentaborane\n\n**CAS No.:** 19624227\n\n**PEL (ppm):** 0.005\n\n**PEL (mg/m\u00b3):** 0.01\n\n**STEL (ppm):** 0.015\n\n**STEL (mg/m\u00b3):** 0.03\n\n> 19624227 | | Pentaborane | 0.005 | 0.01 | | 0.015 | 0.03\n\nSource: \n", "cas_number": "19624227", "file": "pentaborane-2.md", "generated": true, "harvested": "2026-08-05", "id": "pentaborane-2", "pel_mgm3": "0.01", "pel_ppm": "0.005", "source_quote": "19624227 | | Pentaborane | 0.005 | 0.01 | | 0.015 | 0.03", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "stel_mgm3": "0.03", "stel_ppm": "0.015", "substance": "Pentaborane", "title": "Pentaborane \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Pentaborane\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Pentaborane\n\n**CAS No.:** 19624-22-7\n\n> CAS No. 19624-22-7\n\n**NIOSH REL (ppm):** TWA 0.005\n\n**NIOSH REL (mg/m\u00b3):** 0.01\n\n> NIOSH REL TWA 0.005 ppm (0.01 mg/m3) ST 0.015 ppm (0.03 mg/m3)\n\nSource: \n", "cas_number": "19624-22-7", "file": "pentaborane-3.md", "generated": true, "harvested": "2026-09-08", "id": "pentaborane-3", "quote_cas_number": "CAS No. 19624-22-7", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Pentaborane", "rel_mgm3": "0.01", "rel_ppm": "TWA 0.005", "source_quote": "NIOSH REL TWA 0.005 ppm (0.01 mg/m3) ST 0.015 ppm (0.03 mg/m3)", "sources": ["https://www.cdc.gov/niosh/npg/npgd0481.html"], "stale_after": "2027-09-08", "substance": "Pentaborane", "title": "Pentaborane \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Pentaborane\n\n**CAS No.:** 19624-22-7\n\n**PEL (ppm):** 0.005\n\n**PEL (mg/m\u00b3):** 0.01\n\n> Pentaborane | 19624-22-7 | 0.005 | 0.01 | - |\n\nSource: \n", "cas_number": "19624-22-7", "file": "pentaborane.md", "generated": true, "harvested": "2026-08-05", "id": "pentaborane", "pel_mgm3": "0.01", "pel_ppm": "0.005", "source_quote": "Pentaborane | 19624-22-7 | 0.005 | 0.01 | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Pentaborane", "title": "Pentaborane \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Pentachloroethane\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Pentachloroethane\n\n**CAS No.:** 76-01-7\n\n> CAS No. 76-01-7\n\n**NIOSH REL, as stated:** Handle with care in the workplace. See Appendix C (Chloroethanes)\n\n> NIOSH REL Handle with care in the workplace. See Appendix C (Chloroethanes)\n\nSource: \n", "cas_number": "76-01-7", "file": "pentachloroethane.md", "generated": true, "harvested": "2026-09-08", "id": "pentachloroethane", "quote_cas_number": "CAS No. 76-01-7", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Pentachloroethane", "rel_statement": "Handle with care in the workplace. See Appendix C (Chloroethanes)", "source_quote": "NIOSH REL Handle with care in the workplace. See Appendix C (Chloroethanes)", "sources": ["https://www.cdc.gov/niosh/npg/npgd0482.html"], "stale_after": "2027-09-08", "substance": "Pentachloroethane", "title": "Pentachloroethane \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Pentachloronaphthalene\n\n**CAS No.:** 1321648\n\n**PEL (mg/m\u00b3):** 0.5\n\n> 1321648 | S | Pentachloronaphthalene | -- | 0.5\n\nSource: \n", "cas_number": "1321648", "file": "pentachloronaphthalene-2.md", "generated": true, "harvested": "2026-08-05", "id": "pentachloronaphthalene-2", "pel_mgm3": "0.5", "source_quote": "1321648 | S | Pentachloronaphthalene | -- | 0.5", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Pentachloronaphthalene", "title": "Pentachloronaphthalene \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Pentachloronaphthalene\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Pentachloronaphthalene\n\n**CAS No.:** 1321-64-8\n\n> CAS No. 1321-64-8\n\n**NIOSH REL (mg/m\u00b3):** TWA 0.5\n\n> NIOSH REL TWA 0.5 mg/m3 [skin]\n\nSource: \n", "cas_number": "1321-64-8", "file": "pentachloronaphthalene-3.md", "generated": true, "harvested": "2026-09-08", "id": "pentachloronaphthalene-3", "quote_cas_number": "CAS No. 1321-64-8", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Pentachloronaphthalene", "rel_mgm3": "TWA 0.5", "source_quote": "NIOSH REL TWA 0.5 mg/m3 [skin]", "sources": ["https://www.cdc.gov/niosh/npg/npgd0483.html"], "stale_after": "2027-09-08", "substance": "Pentachloronaphthalene", "title": "Pentachloronaphthalene \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Pentachloronaphthalene\n\n**CAS No.:** 1321-64-8\n\n**PEL (mg/m\u00b3):** 0.5\n\n> Pentachloronaphthalene | 1321-64-8 | - | 0.5 | X |\n\nSource: \n", "cas_number": "1321-64-8", "file": "pentachloronaphthalene.md", "generated": true, "harvested": "2026-08-05", "id": "pentachloronaphthalene", "pel_mgm3": "0.5", "source_quote": "Pentachloronaphthalene | 1321-64-8 | - | 0.5 | X |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Pentachloronaphthalene", "title": "Pentachloronaphthalene \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Pentachlorophenol\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Pentachlorophenol\n\n**CAS No.:** 87-86-5\n\n> CAS No. 87-86-5\n\n**NIOSH REL (mg/m\u00b3):** TWA 0.5\n\n> NIOSH REL TWA 0.5 mg/m3 [skin]\n\nSource: \n", "cas_number": "87-86-5", "file": "pentachlorophenol-2.md", "generated": true, "harvested": "2026-09-08", "id": "pentachlorophenol-2", "quote_cas_number": "CAS No. 87-86-5", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Pentachlorophenol", "rel_mgm3": "TWA 0.5", "source_quote": "NIOSH REL TWA 0.5 mg/m3 [skin]", "sources": ["https://www.cdc.gov/niosh/npg/npgd0484.html"], "stale_after": "2027-09-08", "substance": "Pentachlorophenol", "title": "Pentachlorophenol \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Pentachlorophenol; PCP\n\n**CAS No.:** 87865\n\n**PEL (mg/m\u00b3):** 0.5\n\n> 87865 | S | Pentachlorophenol; PCP | -- | 0.5\n\nSource: \n", "cas_number": "87865", "file": "pentachlorophenol-pcp.md", "generated": true, "harvested": "2026-08-05", "id": "pentachlorophenol-pcp", "pel_mgm3": "0.5", "source_quote": "87865 | S | Pentachlorophenol; PCP | -- | 0.5", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Pentachlorophenol; PCP", "title": "Pentachlorophenol; PCP \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Pentachlorophenol\n\n**CAS No.:** 87-86-5\n\n**PEL (mg/m\u00b3):** 0.5\n\n> Pentachlorophenol | 87-86-5 | - | 0.5 | X |\n\nSource: \n", "cas_number": "87-86-5", "file": "pentachlorophenol.md", "generated": true, "harvested": "2026-08-05", "id": "pentachlorophenol", "pel_mgm3": "0.5", "source_quote": "Pentachlorophenol | 87-86-5 | - | 0.5 | X |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Pentachlorophenol", "title": "Pentachlorophenol \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Pentaerythritol\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Pentaerythritol\n\n**CAS No.:** 115-77-5\n\n> CAS No. 115-77-5\n\n**NIOSH REL, as stated:** TWA 10 mg/m3 (total) TWA 5 mg/m3 (resp)\n\n> NIOSH REL TWA 10 mg/m3 (total) TWA 5 mg/m3 (resp)\n\nSource: \n", "cas_number": "115-77-5", "file": "pentaerythritol-2.md", "generated": true, "harvested": "2026-09-08", "id": "pentaerythritol-2", "quote_cas_number": "CAS No. 115-77-5", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Pentaerythritol", "rel_statement": "TWA 10 mg/m3 (total) TWA 5 mg/m3 (resp)", "source_quote": "NIOSH REL TWA 10 mg/m3 (total) TWA 5 mg/m3 (resp)", "sources": ["https://www.cdc.gov/niosh/npg/npgd0485.html"], "stale_after": "2027-09-08", "substance": "Pentaerythritol", "title": "Pentaerythritol \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Pentaerythritol; tetrakis-(hydroxymethyl)methane; tetra-methylolmethane; see Particulates not otherwise regulated\n\n**CAS No.:** 115775\n\n> 115775 | | Pentaerythritol; tetrakis-(hydroxymethyl)methane; tetra-methylolmethane; see Particulates not otherwise regulated\n\nSource: \n", "cas_number": "115775", "file": "pentaerythritol-tetrakis-hydroxymethyl-methane-tetra-methylolmethane-see-particu.md", "generated": true, "harvested": "2026-08-05", "id": "pentaerythritol-tetrakis-hydroxymethyl-methane-tetra-methylolmethane-see-particu", "source_quote": "115775 | | Pentaerythritol; tetrakis-(hydroxymethyl)methane; tetra-methylolmethane; see Particulates not otherwise regulated", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Pentaerythritol; tetrakis-(hydroxymethyl)methane; tetra-methylolmethane; see Particulates not otherwise regulated", "title": "Pentaerythritol; tetrakis-(hydroxymethyl)methane; tetra-methylolmethane; see Particulates not otherwise regulated \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Pentaerythritol\n\n**CAS No.:** 115-77-5\n\n> Pentaerythritol | 115-77-5 | - | - | - |\n\nSource: \n", "cas_number": "115-77-5", "file": "pentaerythritol.md", "generated": true, "harvested": "2026-08-05", "id": "pentaerythritol", "source_quote": "Pentaerythritol | 115-77-5 | - | - | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Pentaerythritol", "title": "Pentaerythritol \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Pentane\n\n**CAS No.:** 109660\n\n**PEL (ppm):** 600\n\n**PEL (mg/m\u00b3):** 1,800\n\n> 109660 | | Pentane | 600 | 1,800\n\nSource: \n", "cas_number": "109660", "file": "pentane-2.md", "generated": true, "harvested": "2026-08-05", "id": "pentane-2", "pel_mgm3": "1,800", "pel_ppm": "600", "source_quote": "109660 | | Pentane | 600 | 1,800", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Pentane", "title": "Pentane \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Pentane\n\n**CAS No.:** 109-66-0\n\n**PEL (ppm):** 1000\n\n**PEL (mg/m\u00b3):** 2950\n\n> Pentane | 109-66-0 | 1000 | 2950 | - |\n\nSource: \n", "cas_number": "109-66-0", "file": "pentane.md", "generated": true, "harvested": "2026-08-05", "id": "pentane", "pel_mgm3": "2950", "pel_ppm": "1000", "source_quote": "Pentane | 109-66-0 | 1000 | 2950 | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Pentane", "title": "Pentane \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Perchloroethane; see Hexachloroethane\n\n**CAS No.:** 67721\n\n> 67721 | | Perchloroethane; see Hexachloroethane\n\nSource: \n", "cas_number": "67721", "file": "perchloroethane-see-hexachloroethane.md", "generated": true, "harvested": "2026-08-05", "id": "perchloroethane-see-hexachloroethane", "source_quote": "67721 | | Perchloroethane; see Hexachloroethane", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Perchloroethane; see Hexachloroethane", "title": "Perchloroethane; see Hexachloroethane \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Perchloroethylene (Tetrachloroethylene)\n\n**CAS No.:** 127-18-4\n\n> Perchloroethylene (Tetrachloroethylene) | 127-18-4 | - | (2) | - |\n\nSource: \n", "cas_number": "127-18-4", "file": "perchloroethylene-tetrachloroethylene.md", "generated": true, "harvested": "2026-08-05", "id": "perchloroethylene-tetrachloroethylene", "source_quote": "Perchloroethylene (Tetrachloroethylene) | 127-18-4 | - | (2) | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Perchloroethylene (Tetrachloroethylene)", "title": "Perchloroethylene (Tetrachloroethylene) \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Perchloroethylene\n\n**CAS No.:** 127184\n\n**PEL (ppm):** 25\n\n**PEL (mg/m\u00b3):** 170\n\n**Ceiling:** 300 ppm\n\n**STEL (ppm):** 100\n\n**STEL (mg/m\u00b3):** 685\n\n> 127184 | | Perchloroethylene | 25 | 170 | 300 ppm | 100 | 685\n\nSource: \n", "cas_number": "127184", "ceiling": "300 ppm", "file": "perchloroethylene.md", "generated": true, "harvested": "2026-08-05", "id": "perchloroethylene", "pel_mgm3": "170", "pel_ppm": "25", "source_quote": "127184 | | Perchloroethylene | 25 | 170 | 300 ppm | 100 | 685", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "stel_mgm3": "685", "stel_ppm": "100", "substance": "Perchloroethylene", "title": "Perchloroethylene \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Perchloromethyl mercaptan\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Perchloromethyl mercaptan\n\n**CAS No.:** 594-42-3\n\n> CAS No. 594-42-3\n\n**NIOSH REL (ppm):** TWA 0.1\n\n**NIOSH REL (mg/m\u00b3):** 0.8\n\n> NIOSH REL TWA 0.1 ppm (0.8 mg/m3)\n\nSource: \n", "cas_number": "594-42-3", "file": "perchloromethyl-mercaptan-2.md", "generated": true, "harvested": "2026-09-08", "id": "perchloromethyl-mercaptan-2", "quote_cas_number": "CAS No. 594-42-3", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Perchloromethyl mercaptan", "rel_mgm3": "0.8", "rel_ppm": "TWA 0.1", "source_quote": "NIOSH REL TWA 0.1 ppm (0.8 mg/m3)", "sources": ["https://www.cdc.gov/niosh/npg/npgd0489.html"], "stale_after": "2027-09-08", "substance": "Perchloromethyl mercaptan", "title": "Perchloromethyl mercaptan \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Perchloromethyl mercaptan; trichloromethanethiol\n\n**CAS No.:** 594423\n\n**PEL (ppm):** 0.1\n\n**PEL (mg/m\u00b3):** 0.8\n\n> 594423 | | Perchloromethyl mercaptan; trichloromethanethiol | 0.1 | 0.8\n\nSource: \n", "cas_number": "594423", "file": "perchloromethyl-mercaptan-trichloromethanethiol.md", "generated": true, "harvested": "2026-08-05", "id": "perchloromethyl-mercaptan-trichloromethanethiol", "pel_mgm3": "0.8", "pel_ppm": "0.1", "source_quote": "594423 | | Perchloromethyl mercaptan; trichloromethanethiol | 0.1 | 0.8", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Perchloromethyl mercaptan; trichloromethanethiol", "title": "Perchloromethyl mercaptan; trichloromethanethiol \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Perchloromethyl mercaptan\n\n**CAS No.:** 594-42-3\n\n**PEL (ppm):** 0.1\n\n**PEL (mg/m\u00b3):** 0.8\n\n> Perchloromethyl mercaptan | 594-42-3 | 0.1 | 0.8 | - |\n\nSource: \n", "cas_number": "594-42-3", "file": "perchloromethyl-mercaptan.md", "generated": true, "harvested": "2026-08-05", "id": "perchloromethyl-mercaptan", "pel_mgm3": "0.8", "pel_ppm": "0.1", "source_quote": "Perchloromethyl mercaptan | 594-42-3 | 0.1 | 0.8 | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Perchloromethyl mercaptan", "title": "Perchloromethyl mercaptan \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Perchloryl fluoride\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Perchloryl fluoride\n\n**CAS No.:** 7616-94-6\n\n> CAS No. 7616-94-6\n\n**NIOSH REL (ppm):** TWA 3\n\n**NIOSH REL (mg/m\u00b3):** 14\n\n> NIOSH REL TWA 3 ppm (14 mg/m3) ST 6 ppm (28 mg/m3)\n\nSource: \n", "cas_number": "7616-94-6", "file": "perchloryl-fluoride-2.md", "generated": true, "harvested": "2026-09-08", "id": "perchloryl-fluoride-2", "quote_cas_number": "CAS No. 7616-94-6", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Perchloryl fluoride", "rel_mgm3": "14", "rel_ppm": "TWA 3", "source_quote": "NIOSH REL TWA 3 ppm (14 mg/m3) ST 6 ppm (28 mg/m3)", "sources": ["https://www.cdc.gov/niosh/npg/npgd0490.html"], "stale_after": "2027-09-08", "substance": "Perchloryl fluoride", "title": "Perchloryl fluoride \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Perchloryl fluoride; C10$3F\n\n**CAS No.:** 7616946\n\n**PEL (ppm):** 3\n\n**PEL (mg/m\u00b3):** 14\n\n**STEL (ppm):** 6\n\n**STEL (mg/m\u00b3):** 28\n\n> 7616946 | | Perchloryl fluoride; C10$3F | 3 | 14 | | 6 | 28\n\nSource: \n", "cas_number": "7616946", "file": "perchloryl-fluoride-c10-3-f.md", "generated": true, "harvested": "2026-08-05", "id": "perchloryl-fluoride-c10-3-f", "pel_mgm3": "14", "pel_ppm": "3", "source_quote": "7616946 | | Perchloryl fluoride; C10$3F | 3 | 14 | | 6 | 28", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "stel_mgm3": "28", "stel_ppm": "6", "substance": "Perchloryl fluoride; C10$3F", "title": "Perchloryl fluoride; C10 $3 F \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Perchloryl fluoride\n\n**CAS No.:** 7616-94-6\n\n**PEL (ppm):** 3\n\n**PEL (mg/m\u00b3):** 13.5\n\n> Perchloryl fluoride | 7616-94-6 | 3 | 13.5 | - |\n\nSource: \n", "cas_number": "7616-94-6", "file": "perchloryl-fluoride.md", "generated": true, "harvested": "2026-08-05", "id": "perchloryl-fluoride", "pel_mgm3": "13.5", "pel_ppm": "3", "source_quote": "Perchloryl fluoride | 7616-94-6 | 3 | 13.5 | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Perchloryl fluoride", "title": "Perchloryl fluoride \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Perfluoroisobutylene\n\n**CAS No.:** 382218\n\n**PEL (ppm):** 0.01\n\n**PEL (mg/m\u00b3):** 0.082\n\n**Ceiling:** C\n\n> 382218 | | Perfluoroisobutylene | 0.01 | 0.082 | C\n\nSource: \n", "cas_number": "382218", "ceiling": "C", "file": "perfluoroisobutylene.md", "generated": true, "harvested": "2026-08-05", "id": "perfluoroisobutylene", "pel_mgm3": "0.082", "pel_ppm": "0.01", "source_quote": "382218 | | Perfluoroisobutylene | 0.01 | 0.082 | C", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Perfluoroisobutylene", "title": "Perfluoroisobutylene \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Perlite\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Perlite\n\n**CAS No.:** 93763-70-3\n\n> CAS No. 93763-70-3\n\n**NIOSH REL, as stated:** TWA 10 mg/m3 (total) TWA 5 mg/m3 (resp)\n\n> NIOSH REL TWA 10 mg/m3 (total) TWA 5 mg/m3 (resp)\n\nSource: \n", "cas_number": "93763-70-3", "file": "perlite.md", "generated": true, "harvested": "2026-09-08", "id": "perlite", "quote_cas_number": "CAS No. 93763-70-3", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Perlite", "rel_statement": "TWA 10 mg/m3 (total) TWA 5 mg/m3 (resp)", "source_quote": "NIOSH REL TWA 10 mg/m3 (total) TWA 5 mg/m3 (resp)", "sources": ["https://www.cdc.gov/niosh/npg/npgd0491.html"], "stale_after": "2027-09-08", "substance": "Perlite", "title": "Perlite \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Petroleum distillates (naphtha)\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Petroleum distillates (naphtha)\n\n**CAS No.:** 8002-05-9\n\n> CAS No. 8002-05-9\n\n**NIOSH REL (mg/m\u00b3):** TWA 350\n\n> NIOSH REL TWA 350 mg/m3 C 1800 mg/m3 [15-minute]\n\nSource: \n", "cas_number": "8002-05-9", "file": "petroleum-distillates-naphtha.md", "generated": true, "harvested": "2026-09-08", "id": "petroleum-distillates-naphtha", "quote_cas_number": "CAS No. 8002-05-9", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Petroleum distillates (naphtha)", "rel_mgm3": "TWA 350", "source_quote": "NIOSH REL TWA 350 mg/m3 C 1800 mg/m3 [15-minute]", "sources": ["https://www.cdc.gov/niosh/npg/npgd0492.html"], "stale_after": "2027-09-08", "substance": "Petroleum distillates (naphtha)", "title": "Petroleum distillates (naphtha) \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Phenol\n\n**CAS No.:** 108952\n\n**PEL (ppm):** 5\n\n**PEL (mg/m\u00b3):** 19\n\n> 108952 | S | Phenol | 5 | 19\n\nSource: \n", "cas_number": "108952", "file": "phenol-2.md", "generated": true, "harvested": "2026-08-05", "id": "phenol-2", "pel_mgm3": "19", "pel_ppm": "5", "source_quote": "108952 | S | Phenol | 5 | 19", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Phenol", "title": "Phenol \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Phenol\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Phenol\n\n**CAS No.:** 108-95-2\n\n> CAS No. 108-95-2\n\n**NIOSH REL (ppm):** TWA 5\n\n**NIOSH REL (mg/m\u00b3):** 19\n\n> NIOSH REL TWA 5 ppm (19 mg/m3) C 15.6 ppm (60 mg/m3) [15-minute] [skin]\n\nSource: \n", "cas_number": "108-95-2", "file": "phenol-3.md", "generated": true, "harvested": "2026-09-08", "id": "phenol-3", "quote_cas_number": "CAS No. 108-95-2", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Phenol", "rel_mgm3": "19", "rel_ppm": "TWA 5", "source_quote": "NIOSH REL TWA 5 ppm (19 mg/m3) C 15.6 ppm (60 mg/m3) [15-minute] [skin]", "sources": ["https://www.cdc.gov/niosh/npg/npgd0493.html"], "stale_after": "2027-09-08", "substance": "Phenol", "title": "Phenol \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Phenol\n\n**CAS No.:** 108-95-2\n\n**PEL (ppm):** 5\n\n**PEL (mg/m\u00b3):** 19\n\n> Phenol | 108-95-2 | 5 | 19 | X |\n\nSource: \n", "cas_number": "108-95-2", "file": "phenol.md", "generated": true, "harvested": "2026-08-05", "id": "phenol", "pel_mgm3": "19", "pel_ppm": "5", "source_quote": "Phenol | 108-95-2 | 5 | 19 | X |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Phenol", "title": "Phenol \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Phenothiazine; dibenzothiazine\n\n**CAS No.:** 92842\n\n**PEL (mg/m\u00b3):** 5\n\n> 92842 | S | Phenothiazine; dibenzothiazine | -- | 5\n\nSource: \n", "cas_number": "92842", "file": "phenothiazine-dibenzothiazine.md", "generated": true, "harvested": "2026-08-05", "id": "phenothiazine-dibenzothiazine", "pel_mgm3": "5", "source_quote": "92842 | S | Phenothiazine; dibenzothiazine | -- | 5", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Phenothiazine; dibenzothiazine", "title": "Phenothiazine; dibenzothiazine \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Phenothiazine\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Phenothiazine\n\n**CAS No.:** 92-84-2\n\n> CAS No. 92-84-2\n\n**NIOSH REL (mg/m\u00b3):** TWA 5\n\n> NIOSH REL TWA 5 mg/m3 [skin]\n\nSource: \n", "cas_number": "92-84-2", "file": "phenothiazine.md", "generated": true, "harvested": "2026-09-08", "id": "phenothiazine", "quote_cas_number": "CAS No. 92-84-2", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Phenothiazine", "rel_mgm3": "TWA 5", "source_quote": "NIOSH REL TWA 5 mg/m3 [skin]", "sources": ["https://www.cdc.gov/niosh/npg/npgd0494.html"], "stale_after": "2027-09-08", "substance": "Phenothiazine", "title": "Phenothiazine \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Phenyl ether-biphenyl mixture (vapor)\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Phenyl ether-biphenyl mixture (vapor)\n\n**CAS No.:** 8004-13-5\n\n> CAS No. 8004-13-5\n\n**NIOSH REL (ppm):** TWA 1\n\n**NIOSH REL (mg/m\u00b3):** 7\n\n> NIOSH REL TWA 1 ppm (7 mg/m3)\n\nSource: \n", "cas_number": "8004-13-5", "file": "phenyl-ether-biphenyl-mixture-vapor.md", "generated": true, "harvested": "2026-09-08", "id": "phenyl-ether-biphenyl-mixture-vapor", "quote_cas_number": "CAS No. 8004-13-5", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Phenyl ether-biphenyl mixture (vapor)", "rel_mgm3": "7", "rel_ppm": "TWA 1", "source_quote": "NIOSH REL TWA 1 ppm (7 mg/m3)", "sources": ["https://www.cdc.gov/niosh/npg/npgd0683.html"], "stale_after": "2027-09-08", "substance": "Phenyl ether-biphenyl mixture (vapor)", "title": "Phenyl ether-biphenyl mixture (vapor) \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Phenyl ether, vapor\n\n**CAS No.:** 101848\n\n**PEL (ppm):** 1\n\n**PEL (mg/m\u00b3):** 7\n\n> 101848 | | Phenyl ether, vapor | 1 | 7\n\nSource: \n", "cas_number": "101848", "file": "phenyl-ether-vapor-2.md", "generated": true, "harvested": "2026-08-05", "id": "phenyl-ether-vapor-2", "pel_mgm3": "7", "pel_ppm": "1", "source_quote": "101848 | | Phenyl ether, vapor | 1 | 7", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Phenyl ether, vapor", "title": "Phenyl ether, vapor \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Phenyl ether (vapor)\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Phenyl ether (vapor)\n\n**CAS No.:** 101-84-8\n\n> CAS No. 101-84-8\n\n**NIOSH REL (ppm):** TWA 1\n\n**NIOSH REL (mg/m\u00b3):** 7\n\n> NIOSH REL TWA 1 ppm (7 mg/m3)\n\nSource: \n", "cas_number": "101-84-8", "file": "phenyl-ether-vapor-3.md", "generated": true, "harvested": "2026-09-08", "id": "phenyl-ether-vapor-3", "quote_cas_number": "CAS No. 101-84-8", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Phenyl ether (vapor)", "rel_mgm3": "7", "rel_ppm": "TWA 1", "source_quote": "NIOSH REL TWA 1 ppm (7 mg/m3)", "sources": ["https://www.cdc.gov/niosh/npg/npgd0496.html"], "stale_after": "2027-09-08", "substance": "Phenyl ether (vapor)", "title": "Phenyl ether (vapor) \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Phenyl ether, vapor\n\n**CAS No.:** 101-84-8\n\n**PEL (ppm):** 1\n\n**PEL (mg/m\u00b3):** 7\n\n> Phenyl ether, vapor | 101-84-8 | 1 | 7 | - |\n\nSource: \n", "cas_number": "101-84-8", "file": "phenyl-ether-vapor.md", "generated": true, "harvested": "2026-08-05", "id": "phenyl-ether-vapor", "pel_mgm3": "7", "pel_ppm": "1", "source_quote": "Phenyl ether, vapor | 101-84-8 | 1 | 7 | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Phenyl ether, vapor", "title": "Phenyl ether, vapor \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Phenyl glycidyl ether, PGE; 1,2-epoxy-3-phenoxypropane\n\n**CAS No.:** 122601\n\n**PEL (ppm):** 0.1\n\n**PEL (mg/m\u00b3):** 0.6\n\n> 122601 | S | Phenyl glycidyl ether, PGE; 1,2-epoxy-3-phenoxypropane | 0.1 | 0.6\n\nSource: \n", "cas_number": "122601", "file": "phenyl-glycidyl-ether-pge-1-2-epoxy-3-phenoxypropane.md", "generated": true, "harvested": "2026-08-05", "id": "phenyl-glycidyl-ether-pge-1-2-epoxy-3-phenoxypropane", "pel_mgm3": "0.6", "pel_ppm": "0.1", "source_quote": "122601 | S | Phenyl glycidyl ether, PGE; 1,2-epoxy-3-phenoxypropane | 0.1 | 0.6", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Phenyl glycidyl ether, PGE; 1,2-epoxy-3-phenoxypropane", "title": "Phenyl glycidyl ether, PGE; 1,2-epoxy-3-phenoxypropane \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Phenyl glycidyl ether (PGE)\n\n**CAS No.:** 122-60-1\n\n**PEL (ppm):** 10\n\n**PEL (mg/m\u00b3):** 60\n\n> Phenyl glycidyl ether (PGE) | 122-60-1 | 10 | 60 | - |\n\nSource: \n", "cas_number": "122-60-1", "file": "phenyl-glycidyl-ether-pge.md", "generated": true, "harvested": "2026-08-05", "id": "phenyl-glycidyl-ether-pge", "pel_mgm3": "60", "pel_ppm": "10", "source_quote": "Phenyl glycidyl ether (PGE) | 122-60-1 | 10 | 60 | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Phenyl glycidyl ether (PGE)", "title": "Phenyl glycidyl ether (PGE) \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Phenyl glycidyl ether\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Phenyl glycidyl ether\n\n**CAS No.:** 122-60-1\n\n> CAS No. 122-60-1\n\n**NIOSH REL (ppm):** C 1\n\n**NIOSH REL (mg/m\u00b3):** 6\n\n> NIOSH REL Ca C 1 ppm (6 mg/m3) [15-minute]\n\nSource: \n", "cas_number": "122-60-1", "file": "phenyl-glycidyl-ether.md", "generated": true, "harvested": "2026-09-08", "id": "phenyl-glycidyl-ether", "quote_cas_number": "CAS No. 122-60-1", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Phenyl glycidyl ether", "rel_mgm3": "6", "rel_ppm": "C 1", "source_quote": "NIOSH REL Ca C 1 ppm (6 mg/m3) [15-minute]", "sources": ["https://www.cdc.gov/niosh/npg/npgd0498.html"], "stale_after": "2027-09-08", "substance": "Phenyl glycidyl ether", "title": "Phenyl glycidyl ether \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Phenyl mercaptan\n\n**CAS No.:** 108985\n\n**PEL (ppm):** 0.5\n\n**PEL (mg/m\u00b3):** 2\n\n> 108985 | | Phenyl mercaptan | 0.5 | 2\n\nSource: \n", "cas_number": "108985", "file": "phenyl-mercaptan.md", "generated": true, "harvested": "2026-08-05", "id": "phenyl-mercaptan", "pel_mgm3": "2", "pel_ppm": "0.5", "source_quote": "108985 | | Phenyl mercaptan | 0.5 | 2", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Phenyl mercaptan", "title": "Phenyl mercaptan \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Phenylethylene; see Styrene\n\n**CAS No.:** 100425\n\n> 100425 | | Phenylethylene; see Styrene\n\nSource: \n", "cas_number": "100425", "file": "phenylethylene-see-styrene.md", "generated": true, "harvested": "2026-08-05", "id": "phenylethylene-see-styrene", "source_quote": "100425 | | Phenylethylene; see Styrene", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Phenylethylene; see Styrene", "title": "Phenylethylene; see Styrene \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Phenylhydrazine\n\n**CAS No.:** 100630\n\n**PEL (ppm):** 5\n\n**PEL (mg/m\u00b3):** 20\n\n**STEL (ppm):** 10\n\n**STEL (mg/m\u00b3):** 45\n\n> 100630 | S | Phenylhydrazine | 5 | 20 | | 10 | 45\n\nSource: \n", "cas_number": "100630", "file": "phenylhydrazine-2.md", "generated": true, "harvested": "2026-08-05", "id": "phenylhydrazine-2", "pel_mgm3": "20", "pel_ppm": "5", "source_quote": "100630 | S | Phenylhydrazine | 5 | 20 | | 10 | 45", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "stel_mgm3": "45", "stel_ppm": "10", "substance": "Phenylhydrazine", "title": "Phenylhydrazine \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Phenylhydrazine\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Phenylhydrazine\n\n**CAS No.:** 100-63-0\n\n> CAS No. 100-63-0\n\n**NIOSH REL (ppm):** C 0.14\n\n**NIOSH REL (mg/m\u00b3):** 0.6\n\n> NIOSH REL Ca C 0.14 ppm (0.6 mg/m3) [2-hr] [skin]\n\nSource: \n", "cas_number": "100-63-0", "file": "phenylhydrazine-3.md", "generated": true, "harvested": "2026-09-08", "id": "phenylhydrazine-3", "quote_cas_number": "CAS No. 100-63-0", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Phenylhydrazine", "rel_mgm3": "0.6", "rel_ppm": "C 0.14", "source_quote": "NIOSH REL Ca C 0.14 ppm (0.6 mg/m3) [2-hr] [skin]", "sources": ["https://www.cdc.gov/niosh/npg/npgd0499.html"], "stale_after": "2027-09-08", "substance": "Phenylhydrazine", "title": "Phenylhydrazine \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Phenylhydrazine\n\n**CAS No.:** 100-63-0\n\n**PEL (ppm):** 5\n\n**PEL (mg/m\u00b3):** 22\n\n> Phenylhydrazine | 100-63-0 | 5 | 22 | X |\n\nSource: \n", "cas_number": "100-63-0", "file": "phenylhydrazine.md", "generated": true, "harvested": "2026-08-05", "id": "phenylhydrazine", "pel_mgm3": "22", "pel_ppm": "5", "source_quote": "Phenylhydrazine | 100-63-0 | 5 | 22 | X |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Phenylhydrazine", "title": "Phenylhydrazine \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Phenylphosphine\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Phenylphosphine\n\n**CAS No.:** 638-21-1\n\n> CAS No. 638-21-1\n\n**NIOSH REL (ppm):** C 0.05\n\n**NIOSH REL (mg/m\u00b3):** 0.25\n\n> NIOSH REL C 0.05 ppm (0.25 mg/m3)\n\nSource: \n", "cas_number": "638-21-1", "file": "phenylphosphine-2.md", "generated": true, "harvested": "2026-09-08", "id": "phenylphosphine-2", "quote_cas_number": "CAS No. 638-21-1", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Phenylphosphine", "rel_mgm3": "0.25", "rel_ppm": "C 0.05", "source_quote": "NIOSH REL C 0.05 ppm (0.25 mg/m3)", "sources": ["https://www.cdc.gov/niosh/npg/npgd0501.html"], "stale_after": "2027-09-08", "substance": "Phenylphosphine", "title": "Phenylphosphine \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Phenylphosphine\n\n**CAS No.:** 638211\n\n**PEL (ppm):** 0.05\n\n**PEL (mg/m\u00b3):** 0.25\n\n**Ceiling:** C\n\n> 638211 | | Phenylphosphine | 0.05 | 0.25 | C\n\nSource: \n", "cas_number": "638211", "ceiling": "C", "file": "phenylphosphine.md", "generated": true, "harvested": "2026-08-05", "id": "phenylphosphine", "pel_mgm3": "0.25", "pel_ppm": "0.05", "source_quote": "638211 | | Phenylphosphine | 0.05 | 0.25 | C", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Phenylphosphine", "title": "Phenylphosphine \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Phorate; o,o-diethyl S-(ethylthio)methyl phosphorodithioate\n\n**CAS No.:** 298022\n\n**PEL (mg/m\u00b3):** 0.05\n\n**STEL (mg/m\u00b3):** 0.2\n\n> 298022 | S | Phorate; o,o-diethyl S-(ethylthio)methyl phosphorodithioate | -- | 0.05 | | -- | 0.2\n\nSource: \n", "cas_number": "298022", "file": "phorate-o-o-diethyl-s-ethylthio-methyl-phosphorodithioate.md", "generated": true, "harvested": "2026-08-05", "id": "phorate-o-o-diethyl-s-ethylthio-methyl-phosphorodithioate", "pel_mgm3": "0.05", "source_quote": "298022 | S | Phorate; o,o-diethyl S-(ethylthio)methyl phosphorodithioate | -- | 0.05 | | -- | 0.2", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "stel_mgm3": "0.2", "substance": "Phorate; o,o-diethyl S-(ethylthio)methyl phosphorodithioate", "title": "Phorate; o,o-diethyl S-(ethylthio)methyl phosphorodithioate \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Phorate\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Phorate\n\n**CAS No.:** 298-02-2\n\n> CAS No. 298-02-2\n\n**NIOSH REL (mg/m\u00b3):** TWA 0.05\n\n> NIOSH REL TWA 0.05 mg/m3 ST 0.2 mg/m3 [skin]\n\nSource: \n", "cas_number": "298-02-2", "file": "phorate.md", "generated": true, "harvested": "2026-09-08", "id": "phorate", "quote_cas_number": "CAS No. 298-02-2", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Phorate", "rel_mgm3": "TWA 0.05", "source_quote": "NIOSH REL TWA 0.05 mg/m3 ST 0.2 mg/m3 [skin]", "sources": ["https://www.cdc.gov/niosh/npg/npgd0502.html"], "stale_after": "2027-09-08", "substance": "Phorate", "title": "Phorate \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Phosdrin (Mevinphos)\n\n**CAS No.:** 7786-34-7\n\n**PEL (mg/m\u00b3):** 0.1\n\n> Phosdrin (Mevinphos) | 7786-34-7 | - | 0.1 | X |\n\nSource: \n", "cas_number": "7786-34-7", "file": "phosdrin-mevinphos.md", "generated": true, "harvested": "2026-08-05", "id": "phosdrin-mevinphos", "pel_mgm3": "0.1", "source_quote": "Phosdrin (Mevinphos) | 7786-34-7 | - | 0.1 | X |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Phosdrin (Mevinphos)", "title": "Phosdrin (Mevinphos) \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Phosdrin\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Phosdrin\n\n**CAS No.:** 7786-34-7\n\n> CAS No. 7786-34-7\n\n**NIOSH REL (ppm):** TWA 0.01\n\n**NIOSH REL (mg/m\u00b3):** 0.1\n\n> NIOSH REL TWA 0.01 ppm (0.1 mg/m3) ST 0.03 ppm (0.3 mg/m3) [skin]\n\nSource: \n", "cas_number": "7786-34-7", "file": "phosdrin.md", "generated": true, "harvested": "2026-09-08", "id": "phosdrin", "quote_cas_number": "CAS No. 7786-34-7", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Phosdrin", "rel_mgm3": "0.1", "rel_ppm": "TWA 0.01", "source_quote": "NIOSH REL TWA 0.01 ppm (0.1 mg/m3) ST 0.03 ppm (0.3 mg/m3) [skin]", "sources": ["https://www.cdc.gov/niosh/npg/npgd0503.html"], "stale_after": "2027-09-08", "substance": "Phosdrin", "title": "Phosdrin \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Phosgene; carbonyl chloride; COCl$2\n\n**CAS No.:** 75445\n\n**PEL (ppm):** 0.1\n\n**PEL (mg/m\u00b3):** 0.4\n\n> 75445 | | Phosgene; carbonyl chloride; COCl$2 | 0.1 | 0.4\n\nSource: \n", "cas_number": "75445", "file": "phosgene-carbonyl-chloride-cocl-2.md", "generated": true, "harvested": "2026-08-05", "id": "phosgene-carbonyl-chloride-cocl-2", "pel_mgm3": "0.4", "pel_ppm": "0.1", "source_quote": "75445 | | Phosgene; carbonyl chloride; COCl$2 | 0.1 | 0.4", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Phosgene; carbonyl chloride; COCl$2", "title": "Phosgene; carbonyl chloride; COCl $2 \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Phosgene (Carbonyl chloride)\n\n**CAS No.:** 75-44-5\n\n**PEL (ppm):** 0.1\n\n**PEL (mg/m\u00b3):** 0.4\n\n> Phosgene (Carbonyl chloride) | 75-44-5 | 0.1 | 0.4 | - |\n\nSource: \n", "cas_number": "75-44-5", "file": "phosgene-carbonyl-chloride.md", "generated": true, "harvested": "2026-08-05", "id": "phosgene-carbonyl-chloride", "pel_mgm3": "0.4", "pel_ppm": "0.1", "source_quote": "Phosgene (Carbonyl chloride) | 75-44-5 | 0.1 | 0.4 | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Phosgene (Carbonyl chloride)", "title": "Phosgene (Carbonyl chloride) \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Phosgene\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Phosgene\n\n**CAS No.:** 75-44-5\n\n> CAS No. 75-44-5\n\n**NIOSH REL (ppm):** TWA 0.1\n\n**NIOSH REL (mg/m\u00b3):** 0.4\n\n> NIOSH REL TWA 0.1 ppm (0.4 mg/m3) C 0.2 ppm (0.8 mg/m3) [15-minute]\n\nSource: \n", "cas_number": "75-44-5", "file": "phosgene.md", "generated": true, "harvested": "2026-09-08", "id": "phosgene", "quote_cas_number": "CAS No. 75-44-5", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Phosgene", "rel_mgm3": "0.4", "rel_ppm": "TWA 0.1", "source_quote": "NIOSH REL TWA 0.1 ppm (0.4 mg/m3) C 0.2 ppm (0.8 mg/m3) [15-minute]", "sources": ["https://www.cdc.gov/niosh/npg/npgd0504.html"], "stale_after": "2027-09-08", "substance": "Phosgene", "title": "Phosgene \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Phosphine\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Phosphine\n\n**CAS No.:** 7803-51-2\n\n> CAS No. 7803-51-2\n\n**NIOSH REL (ppm):** TWA 0.3\n\n**NIOSH REL (mg/m\u00b3):** 0.4\n\n> NIOSH REL TWA 0.3 ppm (0.4 mg/m3) ST 1 ppm (1 mg/m3)\n\nSource: \n", "cas_number": "7803-51-2", "file": "phosphine-2.md", "generated": true, "harvested": "2026-09-08", "id": "phosphine-2", "quote_cas_number": "CAS No. 7803-51-2", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Phosphine", "rel_mgm3": "0.4", "rel_ppm": "TWA 0.3", "source_quote": "NIOSH REL TWA 0.3 ppm (0.4 mg/m3) ST 1 ppm (1 mg/m3)", "sources": ["https://www.cdc.gov/niosh/npg/npgd0505.html"], "stale_after": "2027-09-08", "substance": "Phosphine", "title": "Phosphine \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Phosphine; PH$3\n\n**CAS No.:** 7803512\n\n**PEL (ppm):** 0.3\n\n**PEL (mg/m\u00b3):** 0.4\n\n**STEL (ppm):** 1\n\n**STEL (mg/m\u00b3):** 1\n\n> 7803512 | | Phosphine; PH$3 | 0.3 | 0.4 | | 1 | 1\n\nSource: \n", "cas_number": "7803512", "file": "phosphine-ph-3.md", "generated": true, "harvested": "2026-08-05", "id": "phosphine-ph-3", "pel_mgm3": "0.4", "pel_ppm": "0.3", "source_quote": "7803512 | | Phosphine; PH$3 | 0.3 | 0.4 | | 1 | 1", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "stel_mgm3": "1", "stel_ppm": "1", "substance": "Phosphine; PH$3", "title": "Phosphine; PH $3 \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Phosphine\n\n**CAS No.:** 7803-51-2\n\n**PEL (ppm):** 0.3\n\n**PEL (mg/m\u00b3):** 0.4\n\n> Phosphine | 7803-51-2 | 0.3 | 0.4 | - |\n\nSource: \n", "cas_number": "7803-51-2", "file": "phosphine.md", "generated": true, "harvested": "2026-08-05", "id": "phosphine", "pel_mgm3": "0.4", "pel_ppm": "0.3", "source_quote": "Phosphine | 7803-51-2 | 0.3 | 0.4 | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Phosphine", "title": "Phosphine \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Phosphoric acid\n\n**CAS No.:** 7664382\n\n**PEL (mg/m\u00b3):** 1\n\n**STEL (mg/m\u00b3):** 3\n\n> 7664382 | | Phosphoric acid | -- | 1 | | -- | 3\n\nSource: \n", "cas_number": "7664382", "file": "phosphoric-acid-2.md", "generated": true, "harvested": "2026-08-05", "id": "phosphoric-acid-2", "pel_mgm3": "1", "source_quote": "7664382 | | Phosphoric acid | -- | 1 | | -- | 3", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "stel_mgm3": "3", "substance": "Phosphoric acid", "title": "Phosphoric acid \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Phosphoric acid\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Phosphoric acid\n\n**CAS No.:** 7664-38-2\n\n> CAS No. 7664-38-2\n\n**NIOSH REL (mg/m\u00b3):** TWA 1\n\n> NIOSH REL TWA 1 mg/m3 ST 3 mg/m3\n\nSource: \n", "cas_number": "7664-38-2", "file": "phosphoric-acid-3.md", "generated": true, "harvested": "2026-09-08", "id": "phosphoric-acid-3", "quote_cas_number": "CAS No. 7664-38-2", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Phosphoric acid", "rel_mgm3": "TWA 1", "source_quote": "NIOSH REL TWA 1 mg/m3 ST 3 mg/m3", "sources": ["https://www.cdc.gov/niosh/npg/npgd0506.html"], "stale_after": "2027-09-08", "substance": "Phosphoric acid", "title": "Phosphoric acid \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Phosphoric acid\n\n**CAS No.:** 7664-38-2\n\n**PEL (mg/m\u00b3):** 1\n\n> Phosphoric acid | 7664-38-2 | - | 1 | - |\n\nSource: \n", "cas_number": "7664-38-2", "file": "phosphoric-acid.md", "generated": true, "harvested": "2026-08-05", "id": "phosphoric-acid", "pel_mgm3": "1", "source_quote": "Phosphoric acid | 7664-38-2 | - | 1 | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Phosphoric acid", "title": "Phosphoric acid \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Phosphorus oxychloride\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Phosphorus oxychloride\n\n**CAS No.:** 10025-87-3\n\n> CAS No. 10025-87-3\n\n**NIOSH REL (ppm):** TWA 0.1\n\n**NIOSH REL (mg/m\u00b3):** 0.6\n\n> NIOSH REL TWA 0.1 ppm (0.6 mg/m3) ST 0.5 ppm (3 mg/m3)\n\nSource: \n", "cas_number": "10025-87-3", "file": "phosphorus-oxychloride-2.md", "generated": true, "harvested": "2026-09-08", "id": "phosphorus-oxychloride-2", "quote_cas_number": "CAS No. 10025-87-3", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Phosphorus oxychloride", "rel_mgm3": "0.6", "rel_ppm": "TWA 0.1", "source_quote": "NIOSH REL TWA 0.1 ppm (0.6 mg/m3) ST 0.5 ppm (3 mg/m3)", "sources": ["https://www.cdc.gov/niosh/npg/npgd0508.html"], "stale_after": "2027-09-08", "substance": "Phosphorus oxychloride", "title": "Phosphorus oxychloride \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Phosphorus oxychloride\n\n**CAS No.:** 10025873\n\n**PEL (ppm):** 0.1\n\n**PEL (mg/m\u00b3):** 0.6\n\n> 10025873 | | Phosphorus oxychloride | 0.1 | 0.6\n\nSource: \n", "cas_number": "10025873", "file": "phosphorus-oxychloride.md", "generated": true, "harvested": "2026-08-05", "id": "phosphorus-oxychloride", "pel_mgm3": "0.6", "pel_ppm": "0.1", "source_quote": "10025873 | | Phosphorus oxychloride | 0.1 | 0.6", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Phosphorus oxychloride", "title": "Phosphorus oxychloride \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Phosphorus pentachloride\n\n**CAS No.:** 10026138\n\n**PEL (ppm):** 0.1\n\n**PEL (mg/m\u00b3):** 1\n\n> 10026138 | | Phosphorus pentachloride | 0.1 | 1\n\nSource: \n", "cas_number": "10026138", "file": "phosphorus-pentachloride-2.md", "generated": true, "harvested": "2026-08-05", "id": "phosphorus-pentachloride-2", "pel_mgm3": "1", "pel_ppm": "0.1", "source_quote": "10026138 | | Phosphorus pentachloride | 0.1 | 1", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Phosphorus pentachloride", "title": "Phosphorus pentachloride \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Phosphorus pentachloride\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Phosphorus pentachloride\n\n**CAS No.:** 10026-13-8\n\n> CAS No. 10026-13-8\n\n**NIOSH REL (mg/m\u00b3):** TWA 1\n\n> NIOSH REL TWA 1 mg/m3\n\nSource: \n", "cas_number": "10026-13-8", "file": "phosphorus-pentachloride-3.md", "generated": true, "harvested": "2026-09-08", "id": "phosphorus-pentachloride-3", "quote_cas_number": "CAS No. 10026-13-8", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Phosphorus pentachloride", "rel_mgm3": "TWA 1", "source_quote": "NIOSH REL TWA 1 mg/m3", "sources": ["https://www.cdc.gov/niosh/npg/npgd0509.html"], "stale_after": "2027-09-08", "substance": "Phosphorus pentachloride", "title": "Phosphorus pentachloride \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Phosphorus pentachloride\n\n**CAS No.:** 10026-13-8\n\n**PEL (mg/m\u00b3):** 1\n\n> Phosphorus pentachloride | 10026-13-8 | - | 1 | - |\n\nSource: \n", "cas_number": "10026-13-8", "file": "phosphorus-pentachloride.md", "generated": true, "harvested": "2026-08-05", "id": "phosphorus-pentachloride", "pel_mgm3": "1", "source_quote": "Phosphorus pentachloride | 10026-13-8 | - | 1 | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Phosphorus pentachloride", "title": "Phosphorus pentachloride \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Phosphorus pentasulfide\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Phosphorus pentasulfide\n\n**CAS No.:** 1314-80-3\n\n> CAS No. 1314-80-3\n\n**NIOSH REL (mg/m\u00b3):** TWA 1\n\n> NIOSH REL TWA 1 mg/m3 ST 3 mg/m3\n\nSource: \n", "cas_number": "1314-80-3", "file": "phosphorus-pentasulfide-2.md", "generated": true, "harvested": "2026-09-08", "id": "phosphorus-pentasulfide-2", "quote_cas_number": "CAS No. 1314-80-3", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Phosphorus pentasulfide", "rel_mgm3": "TWA 1", "source_quote": "NIOSH REL TWA 1 mg/m3 ST 3 mg/m3", "sources": ["https://www.cdc.gov/niosh/npg/npgd0510.html"], "stale_after": "2027-09-08", "substance": "Phosphorus pentasulfide", "title": "Phosphorus pentasulfide \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Phosphorus pentasulfide; P$2S$5\n\n**CAS No.:** 1314803\n\n**PEL (mg/m\u00b3):** 1\n\n**STEL (mg/m\u00b3):** 3\n\n> 1314803 | | Phosphorus pentasulfide; P$2S$5 | -- | 1 | | -- | 3\n\nSource: \n", "cas_number": "1314803", "file": "phosphorus-pentasulfide-p-2-s-5.md", "generated": true, "harvested": "2026-08-05", "id": "phosphorus-pentasulfide-p-2-s-5", "pel_mgm3": "1", "source_quote": "1314803 | | Phosphorus pentasulfide; P$2S$5 | -- | 1 | | -- | 3", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "stel_mgm3": "3", "substance": "Phosphorus pentasulfide; P$2S$5", "title": "Phosphorus pentasulfide; P $2 S $5 \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Phosphorus pentasulfide\n\n**CAS No.:** 1314-80-3\n\n**PEL (mg/m\u00b3):** 1\n\n> Phosphorus pentasulfide | 1314-80-3 | - | 1 | - |\n\nSource: \n", "cas_number": "1314-80-3", "file": "phosphorus-pentasulfide.md", "generated": true, "harvested": "2026-08-05", "id": "phosphorus-pentasulfide", "pel_mgm3": "1", "source_quote": "Phosphorus pentasulfide | 1314-80-3 | - | 1 | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Phosphorus pentasulfide", "title": "Phosphorus pentasulfide \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Phosphorus trichloride\n\n**CAS No.:** 7719122\n\n**PEL (ppm):** 0.2\n\n**PEL (mg/m\u00b3):** 1.5\n\n**STEL (ppm):** 0.5\n\n**STEL (mg/m\u00b3):** 3\n\n> 7719122 | | Phosphorus trichloride | 0.2 | 1.5 | | 0.5 | 3\n\nSource: \n", "cas_number": "7719122", "file": "phosphorus-trichloride-2.md", "generated": true, "harvested": "2026-08-05", "id": "phosphorus-trichloride-2", "pel_mgm3": "1.5", "pel_ppm": "0.2", "source_quote": "7719122 | | Phosphorus trichloride | 0.2 | 1.5 | | 0.5 | 3", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "stel_mgm3": "3", "stel_ppm": "0.5", "substance": "Phosphorus trichloride", "title": "Phosphorus trichloride \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Phosphorus trichloride\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Phosphorus trichloride\n\n**CAS No.:** 7719-12-2\n\n> CAS No. 7719-12-2\n\n**NIOSH REL (ppm):** TWA 0.2\n\n**NIOSH REL (mg/m\u00b3):** 1.5\n\n> NIOSH REL TWA 0.2 ppm (1.5 mg/m3) ST 0.5 ppm (3 mg/m3)\n\nSource: \n", "cas_number": "7719-12-2", "file": "phosphorus-trichloride-3.md", "generated": true, "harvested": "2026-09-08", "id": "phosphorus-trichloride-3", "quote_cas_number": "CAS No. 7719-12-2", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Phosphorus trichloride", "rel_mgm3": "1.5", "rel_ppm": "TWA 0.2", "source_quote": "NIOSH REL TWA 0.2 ppm (1.5 mg/m3) ST 0.5 ppm (3 mg/m3)", "sources": ["https://www.cdc.gov/niosh/npg/npgd0511.html"], "stale_after": "2027-09-08", "substance": "Phosphorus trichloride", "title": "Phosphorus trichloride \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Phosphorus trichloride\n\n**CAS No.:** 7719-12-2\n\n**PEL (ppm):** 0.5\n\n**PEL (mg/m\u00b3):** 3\n\n> Phosphorus trichloride | 7719-12-2 | 0.5 | 3 | - |\n\nSource: \n", "cas_number": "7719-12-2", "file": "phosphorus-trichloride.md", "generated": true, "harvested": "2026-08-05", "id": "phosphorus-trichloride", "pel_mgm3": "3", "pel_ppm": "0.5", "source_quote": "Phosphorus trichloride | 7719-12-2 | 0.5 | 3 | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Phosphorus trichloride", "title": "Phosphorus trichloride \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Phosphorus, yellow\n\n**CAS No.:** 7723140\n\n**PEL (mg/m\u00b3):** 0.1\n\n> 7723140 | | Phosphorus, yellow | -- | 0.1\n\nSource: \n", "cas_number": "7723140", "file": "phosphorus-yellow-2.md", "generated": true, "harvested": "2026-08-05", "id": "phosphorus-yellow-2", "pel_mgm3": "0.1", "source_quote": "7723140 | | Phosphorus, yellow | -- | 0.1", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Phosphorus, yellow", "title": "Phosphorus, yellow \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Phosphorus (yellow)\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Phosphorus (yellow)\n\n**CAS No.:** 7723-14-0\n\n> CAS No. 7723-14-0\n\n**NIOSH REL (mg/m\u00b3):** TWA 0.1\n\n> NIOSH REL TWA 0.1 mg/m3\n\nSource: \n", "cas_number": "7723-14-0", "file": "phosphorus-yellow-3.md", "generated": true, "harvested": "2026-09-08", "id": "phosphorus-yellow-3", "quote_cas_number": "CAS No. 7723-14-0", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Phosphorus (yellow)", "rel_mgm3": "TWA 0.1", "source_quote": "NIOSH REL TWA 0.1 mg/m3", "sources": ["https://www.cdc.gov/niosh/npg/npgd0507.html"], "stale_after": "2027-09-08", "substance": "Phosphorus (yellow)", "title": "Phosphorus (yellow) \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Phosphorus (yellow)\n\n**CAS No.:** 7723-14-0\n\n**PEL (mg/m\u00b3):** 0.1\n\n> Phosphorus (yellow) | 7723-14-0 | - | 0.1 | - |\n\nSource: \n", "cas_number": "7723-14-0", "file": "phosphorus-yellow.md", "generated": true, "harvested": "2026-08-05", "id": "phosphorus-yellow", "pel_mgm3": "0.1", "source_quote": "Phosphorus (yellow) | 7723-14-0 | - | 0.1 | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Phosphorus (yellow)", "title": "Phosphorus (yellow) \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Phthalic anhydride\n\n**CAS No.:** 85449\n\n**PEL (ppm):** 1\n\n**PEL (mg/m\u00b3):** 6\n\n> 85449 | | Phthalic anhydride | 1 | 6\n\nSource: \n", "cas_number": "85449", "file": "phthalic-anhydride-2.md", "generated": true, "harvested": "2026-08-05", "id": "phthalic-anhydride-2", "pel_mgm3": "6", "pel_ppm": "1", "source_quote": "85449 | | Phthalic anhydride | 1 | 6", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Phthalic anhydride", "title": "Phthalic anhydride \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Phthalic anhydride\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Phthalic anhydride\n\n**CAS No.:** 85-44-9\n\n> CAS No. 85-44-9\n\n**NIOSH REL (ppm):** 1\n\n**NIOSH REL (mg/m\u00b3):** TWA 6\n\n> NIOSH REL TWA 6 mg/m3 (1 ppm)\n\nSource: \n", "cas_number": "85-44-9", "file": "phthalic-anhydride-3.md", "generated": true, "harvested": "2026-09-08", "id": "phthalic-anhydride-3", "quote_cas_number": "CAS No. 85-44-9", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Phthalic anhydride", "rel_mgm3": "TWA 6", "rel_ppm": "1", "source_quote": "NIOSH REL TWA 6 mg/m3 (1 ppm)", "sources": ["https://www.cdc.gov/niosh/npg/npgd0512.html"], "stale_after": "2027-09-08", "substance": "Phthalic anhydride", "title": "Phthalic anhydride \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Phthalic anhydride\n\n**CAS No.:** 85-44-9\n\n**PEL (ppm):** 2\n\n**PEL (mg/m\u00b3):** 12\n\n> Phthalic anhydride | 85-44-9 | 2 | 12 | - |\n\nSource: \n", "cas_number": "85-44-9", "file": "phthalic-anhydride.md", "generated": true, "harvested": "2026-08-05", "id": "phthalic-anhydride", "pel_mgm3": "12", "pel_ppm": "2", "source_quote": "Phthalic anhydride | 85-44-9 | 2 | 12 | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Phthalic anhydride", "title": "Phthalic anhydride \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Picloram\n\n**CAS No.:** 1918021\n\n> 1918021 | | Picloram | --\n\nSource: \n", "cas_number": "1918021", "file": "picloram-2.md", "generated": true, "harvested": "2026-08-05", "id": "picloram-2", "source_quote": "1918021 | | Picloram | --", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Picloram", "title": "Picloram \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Picloram\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Picloram\n\n**CAS No.:** 1918-02-1\n\n> CAS No. 1918-02-1\n\n**NIOSH REL, as stated:** See Appendix D\n\n> NIOSH REL See Appendix D\n\nSource: \n", "cas_number": "1918-02-1", "file": "picloram-3.md", "generated": true, "harvested": "2026-09-08", "id": "picloram-3", "quote_cas_number": "CAS No. 1918-02-1", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Picloram", "rel_statement": "See Appendix D", "source_quote": "NIOSH REL See Appendix D", "sources": ["https://www.cdc.gov/niosh/npg/npgd0514.html"], "stale_after": "2027-09-08", "substance": "Picloram", "title": "Picloram \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Picloram\n\n**CAS No.:** 1918-02-1\n\n> Picloram | 1918-02-1 | - | - | - |\n\nSource: \n", "cas_number": "1918-02-1", "file": "picloram.md", "generated": true, "harvested": "2026-08-05", "id": "picloram", "source_quote": "Picloram | 1918-02-1 | - | - | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Picloram", "title": "Picloram \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Picric acid; 2,4,6-trinitrophenol\n\n**CAS No.:** 88891\n\n**PEL (mg/m\u00b3):** 0.1\n\n> 88891 | S | Picric acid; 2,4,6-trinitrophenol | -- | 0.1\n\nSource: \n", "cas_number": "88891", "file": "picric-acid-2-4-6-trinitrophenol.md", "generated": true, "harvested": "2026-08-05", "id": "picric-acid-2-4-6-trinitrophenol", "pel_mgm3": "0.1", "source_quote": "88891 | S | Picric acid; 2,4,6-trinitrophenol | -- | 0.1", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Picric acid; 2,4,6-trinitrophenol", "title": "Picric acid; 2,4,6-trinitrophenol \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Picric acid\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Picric acid\n\n**CAS No.:** 88-89-1\n\n> CAS No. 88-89-1\n\n**NIOSH REL (mg/m\u00b3):** TWA 0.1\n\n> NIOSH REL TWA 0.1 mg/m3 ST 0.3 mg/m3 [skin]\n\nSource: \n", "cas_number": "88-89-1", "file": "picric-acid-2.md", "generated": true, "harvested": "2026-09-08", "id": "picric-acid-2", "quote_cas_number": "CAS No. 88-89-1", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Picric acid", "rel_mgm3": "TWA 0.1", "source_quote": "NIOSH REL TWA 0.1 mg/m3 ST 0.3 mg/m3 [skin]", "sources": ["https://www.cdc.gov/niosh/npg/npgd0515.html"], "stale_after": "2027-09-08", "substance": "Picric acid", "title": "Picric acid \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Picric acid\n\n**CAS No.:** 88-89-1\n\n**PEL (mg/m\u00b3):** 0.1\n\n> Picric acid | 88-89-1 | - | 0.1 | X |\n\nSource: \n", "cas_number": "88-89-1", "file": "picric-acid.md", "generated": true, "harvested": "2026-08-05", "id": "picric-acid", "pel_mgm3": "0.1", "source_quote": "Picric acid | 88-89-1 | - | 0.1 | X |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Picric acid", "title": "Picric acid \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Pindone; 2-pivalyl-1, 3-indandione\n\n**CAS No.:** 83261\n\n**PEL (mg/m\u00b3):** 0.1\n\n> 83261 | | Pindone; 2-pivalyl-1, 3-indandione | | 0.1\n\nSource: \n", "cas_number": "83261", "file": "pindone-2-pivalyl-1-3-indandione-2.md", "generated": true, "harvested": "2026-08-05", "id": "pindone-2-pivalyl-1-3-indandione-2", "pel_mgm3": "0.1", "source_quote": "83261 | | Pindone; 2-pivalyl-1, 3-indandione | | 0.1", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Pindone; 2-pivalyl-1, 3-indandione", "title": "Pindone; 2-pivalyl-1, 3-indandione \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Pindone (2-Pivalyl-1,3-indandione)\n\n**CAS No.:** 83-26-1\n\n**PEL (mg/m\u00b3):** 0.1\n\n> Pindone (2-Pivalyl-1,3-indandione) | 83-26-1 | - | 0.1 | - |\n\nSource: \n", "cas_number": "83-26-1", "file": "pindone-2-pivalyl-1-3-indandione.md", "generated": true, "harvested": "2026-08-05", "id": "pindone-2-pivalyl-1-3-indandione", "pel_mgm3": "0.1", "source_quote": "Pindone (2-Pivalyl-1,3-indandione) | 83-26-1 | - | 0.1 | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Pindone (2-Pivalyl-1,3-indandione)", "title": "Pindone (2-Pivalyl-1,3-indandione) \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Pindone\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Pindone\n\n**CAS No.:** 83-26-1\n\n> CAS No. 83-26-1\n\n**NIOSH REL (mg/m\u00b3):** TWA 0.1\n\n> NIOSH REL TWA 0.1 mg/m3\n\nSource: \n", "cas_number": "83-26-1", "file": "pindone.md", "generated": true, "harvested": "2026-09-08", "id": "pindone", "quote_cas_number": "CAS No. 83-26-1", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Pindone", "rel_mgm3": "TWA 0.1", "source_quote": "NIOSH REL TWA 0.1 mg/m3", "sources": ["https://www.cdc.gov/niosh/npg/npgd0516.html"], "stale_after": "2027-09-08", "substance": "Pindone", "title": "Pindone \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Piperazine dihydrochloride\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Piperazine dihydrochloride\n\n**CAS No.:** 142-64-3\n\n> CAS No. 142-64-3\n\n**NIOSH REL (mg/m\u00b3):** TWA 5\n\n> NIOSH REL TWA 5 mg/m3\n\nSource: \n", "cas_number": "142-64-3", "file": "piperazine-dihydrochloride-2.md", "generated": true, "harvested": "2026-09-08", "id": "piperazine-dihydrochloride-2", "quote_cas_number": "CAS No. 142-64-3", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Piperazine dihydrochloride", "rel_mgm3": "TWA 5", "source_quote": "NIOSH REL TWA 5 mg/m3", "sources": ["https://www.cdc.gov/niosh/npg/npgd0517.html"], "stale_after": "2027-09-08", "substance": "Piperazine dihydrochloride", "title": "Piperazine dihydrochloride \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Piperazine dihydrochloride\n\n**CAS No.:** 142643\n\n**PEL (mg/m\u00b3):** 5\n\n> 142643 | | Piperazine dihydrochloride | -- | 5\n\nSource: \n", "cas_number": "142643", "file": "piperazine-dihydrochloride.md", "generated": true, "harvested": "2026-08-05", "id": "piperazine-dihydrochloride", "pel_mgm3": "5", "source_quote": "142643 | | Piperazine dihydrochloride | -- | 5", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Piperazine dihydrochloride", "title": "Piperazine dihydrochloride \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Plaster of Paris\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Plaster of Paris\n\n**CAS No.:** 26499-65-0\n\n> CAS No. 26499-65-0\n\n**NIOSH REL, as stated:** TWA 10 mg/m3 (total) TWA 5 mg/m3 (resp)\n\n> NIOSH REL TWA 10 mg/m3 (total) TWA 5 mg/m3 (resp)\n\nSource: \n", "cas_number": "26499-65-0", "file": "plaster-of-paris-2.md", "generated": true, "harvested": "2026-09-08", "id": "plaster-of-paris-2", "quote_cas_number": "CAS No. 26499-65-0", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Plaster of Paris", "rel_statement": "TWA 10 mg/m3 (total) TWA 5 mg/m3 (resp)", "source_quote": "NIOSH REL TWA 10 mg/m3 (total) TWA 5 mg/m3 (resp)", "sources": ["https://www.cdc.gov/niosh/npg/npgd0518.html"], "stale_after": "2027-09-08", "substance": "Plaster of Paris", "title": "Plaster of Paris \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Plaster of Paris; calcium sulfate hemihydrate; see Particulates not otherwise regulated\n\n**CAS No.:** 26499650\n\n> 26499650 | | Plaster of Paris; calcium sulfate hemihydrate; see Particulates not otherwise regulated\n\nSource: \n", "cas_number": "26499650", "file": "plaster-of-paris-calcium-sulfate-hemihydrate-see-particulates-not-otherwise-regu.md", "generated": true, "harvested": "2026-08-05", "id": "plaster-of-paris-calcium-sulfate-hemihydrate-see-particulates-not-otherwise-regu", "source_quote": "26499650 | | Plaster of Paris; calcium sulfate hemihydrate; see Particulates not otherwise regulated", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Plaster of Paris; calcium sulfate hemihydrate; see Particulates not otherwise regulated", "title": "Plaster of Paris; calcium sulfate hemihydrate; see Particulates not otherwise regulated \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Plaster of Paris\n\n**CAS No.:** 26499-65-0\n\n> Plaster of Paris | 26499-65-0 | - | - | - |\n\nSource: \n", "cas_number": "26499-65-0", "file": "plaster-of-paris.md", "generated": true, "harvested": "2026-08-05", "id": "plaster-of-paris", "source_quote": "Plaster of Paris | 26499-65-0 | - | - | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Plaster of Paris", "title": "Plaster of Paris \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Platinum (as Pt)\n\n**CAS No.:** 7440-06-4\n\n> Platinum (as Pt) | 7440-06-4 | - | - | - |\n\nSource: \n", "cas_number": "7440-06-4", "file": "platinum-as-pt.md", "generated": true, "harvested": "2026-08-05", "id": "platinum-as-pt", "source_quote": "Platinum (as Pt) | 7440-06-4 | - | - | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Platinum (as Pt)", "title": "Platinum (as Pt) \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Platinum, metal\n\n**CAS No.:** 7440064\n\n**PEL (mg/m\u00b3):** 1\n\n> 7440064 | | Platinum, metal | -- | 1\n\nSource: \n", "cas_number": "7440064", "file": "platinum-metal.md", "generated": true, "harvested": "2026-08-05", "id": "platinum-metal", "pel_mgm3": "1", "source_quote": "7440064 | | Platinum, metal | -- | 1", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Platinum, metal", "title": "Platinum, metal \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Platinum\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Platinum\n\n**CAS No.:** 7440-06-4\n\n> CAS No. 7440-06-4\n\n**NIOSH REL (mg/m\u00b3):** TWA 1\n\n> NIOSH REL TWA 1 mg/m3\n\nSource: \n", "cas_number": "7440-06-4", "file": "platinum.md", "generated": true, "harvested": "2026-09-08", "id": "platinum", "quote_cas_number": "CAS No. 7440-06-4", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Platinum", "rel_mgm3": "TWA 1", "source_quote": "NIOSH REL TWA 1 mg/m3", "sources": ["https://www.cdc.gov/niosh/npg/npgd0519.html"], "stale_after": "2027-09-08", "substance": "Platinum", "title": "Platinum \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Portland cement\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Portland cement\n\n**CAS No.:** 65997-15-1\n\n> CAS No. 65997-15-1\n\n**NIOSH REL, as stated:** TWA 10 mg/m3 (total) TWA 5 mg/m3 (resp)\n\n> NIOSH REL TWA 10 mg/m3 (total) TWA 5 mg/m3 (resp)\n\nSource: \n", "cas_number": "65997-15-1", "file": "portland-cement-2.md", "generated": true, "harvested": "2026-09-08", "id": "portland-cement-2", "quote_cas_number": "CAS No. 65997-15-1", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Portland cement", "rel_statement": "TWA 10 mg/m3 (total) TWA 5 mg/m3 (resp)", "source_quote": "NIOSH REL TWA 10 mg/m3 (total) TWA 5 mg/m3 (resp)", "sources": ["https://www.cdc.gov/niosh/npg/npgd0521.html"], "stale_after": "2027-09-08", "substance": "Portland cement", "title": "Portland cement \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Portland cement\n\n**CAS No.:** 65997-15-1\n\n> Portland cement | 65997-15-1 | - | - | - |\n\nSource: \n", "cas_number": "65997-15-1", "file": "portland-cement.md", "generated": true, "harvested": "2026-08-05", "id": "portland-cement", "source_quote": "Portland cement | 65997-15-1 | - | - | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Portland cement", "title": "Portland cement \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Potassium cyanide (as CN)\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Potassium cyanide (as CN)\n\n**CAS No.:** 151-50-8\n\n> CAS No. 151-50-8\n\n**NIOSH REL (ppm):** 4.7\n\n**NIOSH REL (mg/m\u00b3):** C 5\n\n> NIOSH REL C 5 mg/m3 (4.7 ppm) [10-minute]\n\nSource: \n", "cas_number": "151-50-8", "file": "potassium-cyanide-as-cn.md", "generated": true, "harvested": "2026-09-08", "id": "potassium-cyanide-as-cn", "quote_cas_number": "CAS No. 151-50-8", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Potassium cyanide (as CN)", "rel_mgm3": "C 5", "rel_ppm": "4.7", "source_quote": "NIOSH REL C 5 mg/m3 (4.7 ppm) [10-minute]", "sources": ["https://www.cdc.gov/niosh/npg/npgd0522.html"], "stale_after": "2027-09-08", "substance": "Potassium cyanide (as CN)", "title": "Potassium cyanide (as CN) \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Potassium hydroxide; caustic potash\n\n**CAS No.:** 1310583\n\n**PEL (mg/m\u00b3):** 2\n\n**Ceiling:** C\n\n> 1310583 | | Potassium hydroxide; caustic potash | -- | 2 | C\n\nSource: \n", "cas_number": "1310583", "ceiling": "C", "file": "potassium-hydroxide-caustic-potash.md", "generated": true, "harvested": "2026-08-05", "id": "potassium-hydroxide-caustic-potash", "pel_mgm3": "2", "source_quote": "1310583 | | Potassium hydroxide; caustic potash | -- | 2 | C", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Potassium hydroxide; caustic potash", "title": "Potassium hydroxide; caustic potash \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Potassium hydroxide\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Potassium hydroxide\n\n**CAS No.:** 1310-58-3\n\n> CAS No. 1310-58-3\n\n**NIOSH REL (mg/m\u00b3):** C 2\n\n> NIOSH REL C 2 mg/m3\n\nSource: \n", "cas_number": "1310-58-3", "file": "potassium-hydroxide.md", "generated": true, "harvested": "2026-09-08", "id": "potassium-hydroxide", "quote_cas_number": "CAS No. 1310-58-3", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Potassium hydroxide", "rel_mgm3": "C 2", "source_quote": "NIOSH REL C 2 mg/m3", "sources": ["https://www.cdc.gov/niosh/npg/npgd0523.html"], "stale_after": "2027-09-08", "substance": "Potassium hydroxide", "title": "Potassium hydroxide \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Potassium stearate\n\n**CAS No.:** 593293\n\n**PEL (mg/m\u00b3):** 10\n\n> 593293 | | Potassium stearate | -- | 10\n\nSource: \n", "cas_number": "593293", "file": "potassium-stearate.md", "generated": true, "harvested": "2026-08-05", "id": "potassium-stearate", "pel_mgm3": "10", "source_quote": "593293 | | Potassium stearate | -- | 10", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Potassium stearate", "title": "Potassium stearate \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Propane\n\n**CAS No.:** 74986\n\n**PEL (ppm):** 1000\n\n**PEL (mg/m\u00b3):** 1800(h)\n\n> 74986 | | Propane | 1000 | 1800(h)\n\nSource: \n", "cas_number": "74986", "file": "propane-2.md", "generated": true, "harvested": "2026-08-05", "id": "propane-2", "pel_mgm3": "1800(h)", "pel_ppm": "1000", "source_quote": "74986 | | Propane | 1000 | 1800(h)", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Propane", "title": "Propane \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Propane\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Propane\n\n**CAS No.:** 74-98-6\n\n> CAS No. 74-98-6\n\n**NIOSH REL (ppm):** TWA 1000\n\n**NIOSH REL (mg/m\u00b3):** 1800\n\n> NIOSH REL TWA 1000 ppm (1800 mg/m3)\n\nSource: \n", "cas_number": "74-98-6", "file": "propane-3.md", "generated": true, "harvested": "2026-09-08", "id": "propane-3", "quote_cas_number": "CAS No. 74-98-6", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Propane", "rel_mgm3": "1800", "rel_ppm": "TWA 1000", "source_quote": "NIOSH REL TWA 1000 ppm (1800 mg/m3)", "sources": ["https://www.cdc.gov/niosh/npg/npgd0524.html"], "stale_after": "2027-09-08", "substance": "Propane", "title": "Propane \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Propane sultone\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Propane sultone\n\n**CAS No.:** 1120-71-4\n\n> CAS No. 1120-71-4\n\n**NIOSH REL, as stated:** Ca See Appendix A\n\n> NIOSH REL Ca See Appendix A\n\nSource: \n", "cas_number": "1120-71-4", "file": "propane-sultone.md", "generated": true, "harvested": "2026-09-08", "id": "propane-sultone", "quote_cas_number": "CAS No. 1120-71-4", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Propane sultone", "rel_statement": "Ca See Appendix A", "source_quote": "NIOSH REL Ca See Appendix A", "sources": ["https://www.cdc.gov/niosh/npg/npgd0525.html"], "stale_after": "2027-09-08", "substance": "Propane sultone", "title": "Propane sultone \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Propane\n\n**CAS No.:** 74-98-6\n\n**PEL (ppm):** 1000\n\n**PEL (mg/m\u00b3):** 1800\n\n> Propane | 74-98-6 | 1000 | 1800 | - |\n\nSource: \n", "cas_number": "74-98-6", "file": "propane.md", "generated": true, "harvested": "2026-08-05", "id": "propane", "pel_mgm3": "1800", "pel_ppm": "1000", "source_quote": "Propane | 74-98-6 | 1000 | 1800 | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Propane", "title": "Propane \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Propargyl alcohol; 2-propyn-1-o1\n\n**CAS No.:** 107197\n\n**PEL (ppm):** 1\n\n**PEL (mg/m\u00b3):** 2\n\n> 107197 | S | Propargyl alcohol; 2-propyn-1-o1 | 1 | 2\n\nSource: \n", "cas_number": "107197", "file": "propargyl-alcohol-2-propyn-1-o1.md", "generated": true, "harvested": "2026-08-05", "id": "propargyl-alcohol-2-propyn-1-o1", "pel_mgm3": "2", "pel_ppm": "1", "source_quote": "107197 | S | Propargyl alcohol; 2-propyn-1-o1 | 1 | 2", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Propargyl alcohol; 2-propyn-1-o1", "title": "Propargyl alcohol; 2-propyn-1-o1 \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Propargyl alcohol\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Propargyl alcohol\n\n**CAS No.:** 107-19-7\n\n> CAS No. 107-19-7\n\n**NIOSH REL (ppm):** TWA 1\n\n**NIOSH REL (mg/m\u00b3):** 2\n\n> NIOSH REL TWA 1 ppm (2 mg/m3) [skin]\n\nSource: \n", "cas_number": "107-19-7", "file": "propargyl-alcohol.md", "generated": true, "harvested": "2026-09-08", "id": "propargyl-alcohol", "quote_cas_number": "CAS No. 107-19-7", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Propargyl alcohol", "rel_mgm3": "2", "rel_ppm": "TWA 1", "source_quote": "NIOSH REL TWA 1 ppm (2 mg/m3) [skin]", "sources": ["https://www.cdc.gov/niosh/npg/npgd0527.html"], "stale_after": "2027-09-08", "substance": "Propargyl alcohol", "title": "Propargyl alcohol \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Propionic acid\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Propionic acid\n\n**CAS No.:** 79-09-4\n\n> CAS No. 79-09-4\n\n**NIOSH REL (ppm):** TWA 10\n\n**NIOSH REL (mg/m\u00b3):** 30\n\n> NIOSH REL TWA 10 ppm (30 mg/m3) ST 15 ppm (45 mg/m3)\n\nSource: \n", "cas_number": "79-09-4", "file": "propionic-acid-2.md", "generated": true, "harvested": "2026-09-08", "id": "propionic-acid-2", "quote_cas_number": "CAS No. 79-09-4", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Propionic acid", "rel_mgm3": "30", "rel_ppm": "TWA 10", "source_quote": "NIOSH REL TWA 10 ppm (30 mg/m3) ST 15 ppm (45 mg/m3)", "sources": ["https://www.cdc.gov/niosh/npg/npgd0529.html"], "stale_after": "2027-09-08", "substance": "Propionic acid", "title": "Propionic acid \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Propionic acid\n\n**CAS No.:** 79094\n\n**PEL (ppm):** 10\n\n**PEL (mg/m\u00b3):** 30\n\n> 79094 | | Propionic acid | 10 | 30\n\nSource: \n", "cas_number": "79094", "file": "propionic-acid.md", "generated": true, "harvested": "2026-08-05", "id": "propionic-acid", "pel_mgm3": "30", "pel_ppm": "10", "source_quote": "79094 | | Propionic acid | 10 | 30", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Propionic acid", "title": "Propionic acid \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Propionitrile\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Propionitrile\n\n**CAS No.:** 107-12-0\n\n> CAS No. 107-12-0\n\n**NIOSH REL (ppm):** TWA 6\n\n**NIOSH REL (mg/m\u00b3):** 14\n\n> NIOSH REL TWA 6 ppm (14 mg/m3)\n\nSource: \n", "cas_number": "107-12-0", "file": "propionitrile.md", "generated": true, "harvested": "2026-09-08", "id": "propionitrile", "quote_cas_number": "CAS No. 107-12-0", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Propionitrile", "rel_mgm3": "14", "rel_ppm": "TWA 6", "source_quote": "NIOSH REL TWA 6 ppm (14 mg/m3)", "sources": ["https://www.cdc.gov/niosh/npg/npgd0530.html"], "stale_after": "2027-09-08", "substance": "Propionitrile", "title": "Propionitrile \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Propoxur; 2-isopropoxyphenyl N-methyl carbamate\n\n**CAS No.:** 114261\n\n**PEL (mg/m\u00b3):** 0.5\n\n> 114261 | | Propoxur; 2-isopropoxyphenyl N-methyl carbamate | | 0.5\n\nSource: \n", "cas_number": "114261", "file": "propoxur-2-isopropoxyphenyl-n-methyl-carbamate.md", "generated": true, "harvested": "2026-08-05", "id": "propoxur-2-isopropoxyphenyl-n-methyl-carbamate", "pel_mgm3": "0.5", "source_quote": "114261 | | Propoxur; 2-isopropoxyphenyl N-methyl carbamate | | 0.5", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Propoxur; 2-isopropoxyphenyl N-methyl carbamate", "title": "Propoxur; 2-isopropoxyphenyl N-methyl carbamate \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Propoxur\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Propoxur\n\n**CAS No.:** 114-26-1\n\n> CAS No. 114-26-1\n\n**NIOSH REL (mg/m\u00b3):** TWA 0.5\n\n> NIOSH REL TWA 0.5 mg/m3\n\nSource: \n", "cas_number": "114-26-1", "file": "propoxur.md", "generated": true, "harvested": "2026-09-08", "id": "propoxur", "quote_cas_number": "CAS No. 114-26-1", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Propoxur", "rel_mgm3": "TWA 0.5", "source_quote": "NIOSH REL TWA 0.5 mg/m3", "sources": ["https://www.cdc.gov/niosh/npg/npgd0531.html"], "stale_after": "2027-09-08", "substance": "Propoxur", "title": "Propoxur \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Propylene dichloride; 1,2-dichloropropane\n\n**CAS No.:** 78875\n\n**PEL (ppm):** 75\n\n**PEL (mg/m\u00b3):** 350\n\n**STEL (ppm):** 110\n\n**STEL (mg/m\u00b3):** 510\n\n> 78875 | | Propylene dichloride; 1,2-dichloropropane | 75 | 350 | | 110 | 510\n\nSource: \n", "cas_number": "78875", "file": "propylene-dichloride-1-2-dichloropropane.md", "generated": true, "harvested": "2026-08-05", "id": "propylene-dichloride-1-2-dichloropropane", "pel_mgm3": "350", "pel_ppm": "75", "source_quote": "78875 | | Propylene dichloride; 1,2-dichloropropane | 75 | 350 | | 110 | 510", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "stel_mgm3": "510", "stel_ppm": "110", "substance": "Propylene dichloride; 1,2-dichloropropane", "title": "Propylene dichloride; 1,2-dichloropropane \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Propylene dichloride\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Propylene dichloride\n\n**CAS No.:** 78-87-5\n\n> CAS No. 78-87-5\n\n**NIOSH REL, as stated:** Ca See Appendix A\n\n> NIOSH REL Ca See Appendix A\n\nSource: \n", "cas_number": "78-87-5", "file": "propylene-dichloride-2.md", "generated": true, "harvested": "2026-09-08", "id": "propylene-dichloride-2", "quote_cas_number": "CAS No. 78-87-5", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Propylene dichloride", "rel_statement": "Ca See Appendix A", "source_quote": "NIOSH REL Ca See Appendix A", "sources": ["https://www.cdc.gov/niosh/npg/npgd0534.html"], "stale_after": "2027-09-08", "substance": "Propylene dichloride", "title": "Propylene dichloride \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Propylene dichloride\n\n**CAS No.:** 78-87-5\n\n**PEL (ppm):** 75\n\n**PEL (mg/m\u00b3):** 350\n\n> Propylene dichloride | 78-87-5 | 75 | 350 | - |\n\nSource: \n", "cas_number": "78-87-5", "file": "propylene-dichloride.md", "generated": true, "harvested": "2026-08-05", "id": "propylene-dichloride", "pel_mgm3": "350", "pel_ppm": "75", "source_quote": "Propylene dichloride | 78-87-5 | 75 | 350 | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Propylene dichloride", "title": "Propylene dichloride \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Propylene glycol dinitrate; PGDN\n\n**CAS No.:** 6423434\n\n**PEL (ppm):** 0.05\n\n**PEL (mg/m\u00b3):** 0.3\n\n> 6423434 | S | Propylene glycol dinitrate; PGDN | 0.05 | 0.3\n\nSource: \n", "cas_number": "6423434", "file": "propylene-glycol-dinitrate-pgdn.md", "generated": true, "harvested": "2026-08-05", "id": "propylene-glycol-dinitrate-pgdn", "pel_mgm3": "0.3", "pel_ppm": "0.05", "source_quote": "6423434 | S | Propylene glycol dinitrate; PGDN | 0.05 | 0.3", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Propylene glycol dinitrate; PGDN", "title": "Propylene glycol dinitrate; PGDN \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Propylene glycol dinitrate\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Propylene glycol dinitrate\n\n**CAS No.:** 6423-43-4\n\n> CAS No. 6423-43-4\n\n**NIOSH REL (ppm):** TWA 0.05\n\n**NIOSH REL (mg/m\u00b3):** 0.3\n\n> NIOSH REL TWA 0.05 ppm (0.3 mg/m3) [skin]\n\nSource: \n", "cas_number": "6423-43-4", "file": "propylene-glycol-dinitrate.md", "generated": true, "harvested": "2026-09-08", "id": "propylene-glycol-dinitrate", "quote_cas_number": "CAS No. 6423-43-4", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Propylene glycol dinitrate", "rel_mgm3": "0.3", "rel_ppm": "TWA 0.05", "source_quote": "NIOSH REL TWA 0.05 ppm (0.3 mg/m3) [skin]", "sources": ["https://www.cdc.gov/niosh/npg/npgd0535.html"], "stale_after": "2027-09-08", "substance": "Propylene glycol dinitrate", "title": "Propylene glycol dinitrate \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Propylene glycol monomethyl ether\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Propylene glycol monomethyl ether\n\n**CAS No.:** 107-98-2\n\n> CAS No. 107-98-2\n\n**NIOSH REL (ppm):** TWA 100\n\n**NIOSH REL (mg/m\u00b3):** 360\n\n> NIOSH REL TWA 100 ppm (360 mg/m3) ST 150 ppm (540 mg/m3)\n\nSource: \n", "cas_number": "107-98-2", "file": "propylene-glycol-monomethyl-ether-2.md", "generated": true, "harvested": "2026-09-08", "id": "propylene-glycol-monomethyl-ether-2", "quote_cas_number": "CAS No. 107-98-2", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Propylene glycol monomethyl ether", "rel_mgm3": "360", "rel_ppm": "TWA 100", "source_quote": "NIOSH REL TWA 100 ppm (360 mg/m3) ST 150 ppm (540 mg/m3)", "sources": ["https://www.cdc.gov/niosh/npg/npgd0536.html"], "stale_after": "2027-09-08", "substance": "Propylene glycol monomethyl ether", "title": "Propylene glycol monomethyl ether \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Propylene glycol monomethyl ether acetate\n\n**CAS No.:** 108656\n\n**PEL (ppm):** 100\n\n**PEL (mg/m\u00b3):** 541\n\n**STEL (ppm):** 150\n\n**STEL (mg/m\u00b3):** 811\n\n> 108656 | S | Propylene glycol monomethyl ether acetate | 100 | 541 | | 150 | 811\n\nSource: \n", "cas_number": "108656", "file": "propylene-glycol-monomethyl-ether-acetate.md", "generated": true, "harvested": "2026-08-05", "id": "propylene-glycol-monomethyl-ether-acetate", "pel_mgm3": "541", "pel_ppm": "100", "source_quote": "108656 | S | Propylene glycol monomethyl ether acetate | 100 | 541 | | 150 | 811", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "stel_mgm3": "811", "stel_ppm": "150", "substance": "Propylene glycol monomethyl ether acetate", "title": "Propylene glycol monomethyl ether acetate \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Propylene glycol monomethyl ether\n\n**CAS No.:** 107982\n\n**PEL (ppm):** 100\n\n**PEL (mg/m\u00b3):** 360\n\n**STEL (ppm):** 150\n\n**STEL (mg/m\u00b3):** 540\n\n> 107982 | S | Propylene glycol monomethyl ether | 100 | 360 | | 150 | 540\n\nSource: \n", "cas_number": "107982", "file": "propylene-glycol-monomethyl-ether.md", "generated": true, "harvested": "2026-08-05", "id": "propylene-glycol-monomethyl-ether", "pel_mgm3": "360", "pel_ppm": "100", "source_quote": "107982 | S | Propylene glycol monomethyl ether | 100 | 360 | | 150 | 540", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "stel_mgm3": "540", "stel_ppm": "150", "substance": "Propylene glycol monomethyl ether", "title": "Propylene glycol monomethyl ether \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Propylene imine\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Propylene imine\n\n**CAS No.:** 75-55-8\n\n> CAS No. 75-55-8\n\n**NIOSH REL (ppm):** TWA 2\n\n**NIOSH REL (mg/m\u00b3):** 5\n\n> NIOSH REL Ca TWA 2 ppm (5 mg/m3) [skin]\n\nSource: \n", "cas_number": "75-55-8", "file": "propylene-imine-2.md", "generated": true, "harvested": "2026-09-08", "id": "propylene-imine-2", "quote_cas_number": "CAS No. 75-55-8", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Propylene imine", "rel_mgm3": "5", "rel_ppm": "TWA 2", "source_quote": "NIOSH REL Ca TWA 2 ppm (5 mg/m3) [skin]", "sources": ["https://www.cdc.gov/niosh/npg/npgd0537.html"], "stale_after": "2027-09-08", "substance": "Propylene imine", "title": "Propylene imine \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Propylene imine\n\n**CAS No.:** 75-55-8\n\n**PEL (ppm):** 2\n\n**PEL (mg/m\u00b3):** 5\n\n> Propylene imine | 75-55-8 | 2 | 5 | X |\n\nSource: \n", "cas_number": "75-55-8", "file": "propylene-imine.md", "generated": true, "harvested": "2026-08-05", "id": "propylene-imine", "pel_mgm3": "5", "pel_ppm": "2", "source_quote": "Propylene imine | 75-55-8 | 2 | 5 | X |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Propylene imine", "title": "Propylene imine \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Propylene oxide; 1,2-epoxy-propane\n\n**CAS No.:** 75569\n\n**PEL (ppm):** 2\n\n**PEL (mg/m\u00b3):** 4.75\n\n> 75569 | | Propylene oxide; 1,2-epoxy-propane | 2 | 4.75\n\nSource: \n", "cas_number": "75569", "file": "propylene-oxide-1-2-epoxy-propane.md", "generated": true, "harvested": "2026-08-05", "id": "propylene-oxide-1-2-epoxy-propane", "pel_mgm3": "4.75", "pel_ppm": "2", "source_quote": "75569 | | Propylene oxide; 1,2-epoxy-propane | 2 | 4.75", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Propylene oxide; 1,2-epoxy-propane", "title": "Propylene oxide; 1,2-epoxy-propane \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Propylene oxide\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Propylene oxide\n\n**CAS No.:** 75-56-9\n\n> CAS No. 75-56-9\n\n**NIOSH REL, as stated:** Ca See Appendix A\n\n> NIOSH REL Ca See Appendix A\n\nSource: \n", "cas_number": "75-56-9", "file": "propylene-oxide-2.md", "generated": true, "harvested": "2026-09-08", "id": "propylene-oxide-2", "quote_cas_number": "CAS No. 75-56-9", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Propylene oxide", "rel_statement": "Ca See Appendix A", "source_quote": "NIOSH REL Ca See Appendix A", "sources": ["https://www.cdc.gov/niosh/npg/npgd0538.html"], "stale_after": "2027-09-08", "substance": "Propylene oxide", "title": "Propylene oxide \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Propylene oxide\n\n**CAS No.:** 75-56-9\n\n**PEL (ppm):** 100\n\n**PEL (mg/m\u00b3):** 240\n\n> Propylene oxide | 75-56-9 | 100 | 240 | - |\n\nSource: \n", "cas_number": "75-56-9", "file": "propylene-oxide.md", "generated": true, "harvested": "2026-08-05", "id": "propylene-oxide", "pel_mgm3": "240", "pel_ppm": "100", "source_quote": "Propylene oxide | 75-56-9 | 100 | 240 | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Propylene oxide", "title": "Propylene oxide \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Propylene\n\n**CAS No.:** 115071\n\n> 115071 | | Propylene | (h) | --\n\nSource: \n", "cas_number": "115071", "file": "propylene.md", "generated": true, "harvested": "2026-08-05", "id": "propylene", "source_quote": "115071 | | Propylene | (h) | --", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Propylene", "title": "Propylene \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Propyleneimine; 2-methylaziridine\n\n**CAS No.:** 75558\n\n**PEL (ppm):** 2\n\n**PEL (mg/m\u00b3):** 5\n\n> 75558 | S | Propyleneimine; 2-methylaziridine | 2 | 5\n\nSource: \n", "cas_number": "75558", "file": "propyleneimine-2-methylaziridine.md", "generated": true, "harvested": "2026-08-05", "id": "propyleneimine-2-methylaziridine", "pel_mgm3": "5", "pel_ppm": "2", "source_quote": "75558 | S | Propyleneimine; 2-methylaziridine | 2 | 5", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Propyleneimine; 2-methylaziridine", "title": "Propyleneimine; 2-methylaziridine \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Propyne; see Methylacetylene\n\n**CAS No.:** 74997\n\n> 74997 | | Propyne; see Methylacetylene\n\nSource: \n", "cas_number": "74997", "file": "propyne-see-methylacetylene.md", "generated": true, "harvested": "2026-08-05", "id": "propyne-see-methylacetylene", "source_quote": "74997 | | Propyne; see Methylacetylene", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Propyne; see Methylacetylene", "title": "Propyne; see Methylacetylene \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Pyrethrum\n\n**CAS No.:** 8003347\n\n**PEL (mg/m\u00b3):** 5\n\n> 8003347 | | Pyrethrum | -- | 5\n\nSource: \n", "cas_number": "8003347", "file": "pyrethrum-2.md", "generated": true, "harvested": "2026-08-05", "id": "pyrethrum-2", "pel_mgm3": "5", "source_quote": "8003347 | | Pyrethrum | -- | 5", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Pyrethrum", "title": "Pyrethrum \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Pyrethrum\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Pyrethrum\n\n**CAS No.:** 8003-34-7\n\n> CAS No. 8003-34-7\n\n**NIOSH REL (mg/m\u00b3):** TWA 5\n\n> NIOSH REL TWA 5 mg/m3\n\nSource: \n", "cas_number": "8003-34-7", "file": "pyrethrum-3.md", "generated": true, "harvested": "2026-09-08", "id": "pyrethrum-3", "quote_cas_number": "CAS No. 8003-34-7", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Pyrethrum", "rel_mgm3": "TWA 5", "source_quote": "NIOSH REL TWA 5 mg/m3", "sources": ["https://www.cdc.gov/niosh/npg/npgd0685.html"], "stale_after": "2027-09-08", "substance": "Pyrethrum", "title": "Pyrethrum \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Pyrethrum\n\n**CAS No.:** 8003-34-7\n\n**PEL (mg/m\u00b3):** 5\n\n> Pyrethrum | 8003-34-7 | - | 5 | - |\n\nSource: \n", "cas_number": "8003-34-7", "file": "pyrethrum.md", "generated": true, "harvested": "2026-08-05", "id": "pyrethrum", "pel_mgm3": "5", "source_quote": "Pyrethrum | 8003-34-7 | - | 5 | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Pyrethrum", "title": "Pyrethrum \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Pyridine\n\n**CAS No.:** 110861\n\n**PEL (ppm):** 5\n\n**PEL (mg/m\u00b3):** 15\n\n> 110861 | | Pyridine | 5 | 15\n\nSource: \n", "cas_number": "110861", "file": "pyridine-2.md", "generated": true, "harvested": "2026-08-05", "id": "pyridine-2", "pel_mgm3": "15", "pel_ppm": "5", "source_quote": "110861 | | Pyridine | 5 | 15", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Pyridine", "title": "Pyridine \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Pyridine\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Pyridine\n\n**CAS No.:** 110-86-1\n\n> CAS No. 110-86-1\n\n**NIOSH REL (ppm):** TWA 5\n\n**NIOSH REL (mg/m\u00b3):** 15\n\n> NIOSH REL TWA 5 ppm (15 mg/m3)\n\nSource: \n", "cas_number": "110-86-1", "file": "pyridine-3.md", "generated": true, "harvested": "2026-09-08", "id": "pyridine-3", "quote_cas_number": "CAS No. 110-86-1", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Pyridine", "rel_mgm3": "15", "rel_ppm": "TWA 5", "source_quote": "NIOSH REL TWA 5 ppm (15 mg/m3)", "sources": ["https://www.cdc.gov/niosh/npg/npgd0541.html"], "stale_after": "2027-09-08", "substance": "Pyridine", "title": "Pyridine \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Pyridine\n\n**CAS No.:** 110-86-1\n\n**PEL (ppm):** 5\n\n**PEL (mg/m\u00b3):** 15\n\n> Pyridine | 110-86-1 | 5 | 15 | - |\n\nSource: \n", "cas_number": "110-86-1", "file": "pyridine.md", "generated": true, "harvested": "2026-08-05", "id": "pyridine", "pel_mgm3": "15", "pel_ppm": "5", "source_quote": "Pyridine | 110-86-1 | 5 | 15 | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Pyridine", "title": "Pyridine \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Quartz; see 1910.1053 7\n\n**CAS No.:** 14808-60-7\n\n> Quartz; see 1910.1053 7 | 14808-60-7 | - | - | - |\n\nSource: \n", "cas_number": "14808-60-7", "file": "quartz-see-1910-1053-7.md", "generated": true, "harvested": "2026-08-05", "id": "quartz-see-1910-1053-7", "source_quote": "Quartz; see 1910.1053 7 | 14808-60-7 | - | - | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Quartz; see 1910.1053 7", "title": "Quartz; see 1910.1053 7 \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Quartz,\n\n**CAS No.:** 14808607\n\n**PEL (mg/m\u00b3):** 0.05\n\n> 14808607 | | Quartz, | -- | 0.05\n\nSource: \n", "cas_number": "14808607", "file": "quartz.md", "generated": true, "harvested": "2026-08-05", "id": "quartz", "pel_mgm3": "0.05", "source_quote": "14808607 | | Quartz, | -- | 0.05", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Quartz,", "title": "Quartz, \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Quinone\n\n**CAS No.:** 106514\n\n**PEL (ppm):** 0.1\n\n**PEL (mg/m\u00b3):** 0.4\n\n> 106514 | | Quinone | 0.1 | 0.4\n\nSource: \n", "cas_number": "106514", "file": "quinone-2.md", "generated": true, "harvested": "2026-08-05", "id": "quinone-2", "pel_mgm3": "0.4", "pel_ppm": "0.1", "source_quote": "106514 | | Quinone | 0.1 | 0.4", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Quinone", "title": "Quinone \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Quinone\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Quinone\n\n**CAS No.:** 106-51-4\n\n> CAS No. 106-51-4\n\n**NIOSH REL (ppm):** 0.1\n\n**NIOSH REL (mg/m\u00b3):** TWA 0.4\n\n> NIOSH REL TWA 0.4 mg/m3 (0.1 ppm)\n\nSource: \n", "cas_number": "106-51-4", "file": "quinone-3.md", "generated": true, "harvested": "2026-09-08", "id": "quinone-3", "quote_cas_number": "CAS No. 106-51-4", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Quinone", "rel_mgm3": "TWA 0.4", "rel_ppm": "0.1", "source_quote": "NIOSH REL TWA 0.4 mg/m3 (0.1 ppm)", "sources": ["https://www.cdc.gov/niosh/npg/npgd0542.html"], "stale_after": "2027-09-08", "substance": "Quinone", "title": "Quinone \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Quinone\n\n**CAS No.:** 106-51-4\n\n**PEL (ppm):** 0.1\n\n**PEL (mg/m\u00b3):** 0.4\n\n> Quinone | 106-51-4 | 0.1 | 0.4 | - |\n\nSource: \n", "cas_number": "106-51-4", "file": "quinone.md", "generated": true, "harvested": "2026-08-05", "id": "quinone", "pel_mgm3": "0.4", "pel_ppm": "0.1", "source_quote": "Quinone | 106-51-4 | 0.1 | 0.4 | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Quinone", "title": "Quinone \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** RDX; see Cyclonite\n\n**CAS No.:** 121824\n\n> 121824 | | RDX; see Cyclonite\n\nSource: \n", "cas_number": "121824", "file": "rdx-see-cyclonite.md", "generated": true, "harvested": "2026-08-05", "id": "rdx-see-cyclonite", "source_quote": "121824 | | RDX; see Cyclonite", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "RDX; see Cyclonite", "title": "RDX; see Cyclonite \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Resorcinol\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Resorcinol\n\n**CAS No.:** 108-46-3\n\n> CAS No. 108-46-3\n\n**NIOSH REL (ppm):** TWA 10\n\n**NIOSH REL (mg/m\u00b3):** 45\n\n> NIOSH REL TWA 10 ppm (45 mg/m3) ST 20 ppm (90 mg/m3)\n\nSource: \n", "cas_number": "108-46-3", "file": "resorcinol-2.md", "generated": true, "harvested": "2026-09-08", "id": "resorcinol-2", "quote_cas_number": "CAS No. 108-46-3", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Resorcinol", "rel_mgm3": "45", "rel_ppm": "TWA 10", "source_quote": "NIOSH REL TWA 10 ppm (45 mg/m3) ST 20 ppm (90 mg/m3)", "sources": ["https://www.cdc.gov/niosh/npg/npgd0543.html"], "stale_after": "2027-09-08", "substance": "Resorcinol", "title": "Resorcinol \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Resorcinol\n\n**CAS No.:** 108463\n\n**PEL (ppm):** 10\n\n**PEL (mg/m\u00b3):** 45\n\n**STEL (ppm):** 20\n\n**STEL (mg/m\u00b3):** 90\n\n> 108463 | | Resorcinol | 10 | 45 | | 20 | 90\n\nSource: \n", "cas_number": "108463", "file": "resorcinol.md", "generated": true, "harvested": "2026-08-05", "id": "resorcinol", "pel_mgm3": "45", "pel_ppm": "10", "source_quote": "108463 | | Resorcinol | 10 | 45 | | 20 | 90", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "stel_mgm3": "90", "stel_ppm": "20", "substance": "Resorcinol", "title": "Resorcinol \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Rhodium (as Rh), metal fume and insoluble compounds\n\n**CAS No.:** 7440-16-6\n\n**PEL (mg/m\u00b3):** 0.1\n\n> Rhodium (as Rh), metal fume and insoluble compounds | 7440-16-6 | - | 0.1 | - |\n\nSource: \n", "cas_number": "7440-16-6", "file": "rhodium-as-rh-metal-fume-and-insoluble-compounds.md", "generated": true, "harvested": "2026-08-05", "id": "rhodium-as-rh-metal-fume-and-insoluble-compounds", "pel_mgm3": "0.1", "source_quote": "Rhodium (as Rh), metal fume and insoluble compounds | 7440-16-6 | - | 0.1 | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Rhodium (as Rh), metal fume and insoluble compounds", "title": "Rhodium (as Rh), metal fume and insoluble compounds \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Rhodium (as Rh), soluble compounds\n\n**CAS No.:** 7440-16-6\n\n**PEL (mg/m\u00b3):** 0.001\n\n> Rhodium (as Rh), soluble compounds | 7440-16-6 | - | 0.001 | - |\n\nSource: \n", "cas_number": "7440-16-6", "file": "rhodium-as-rh-soluble-compounds.md", "generated": true, "harvested": "2026-08-05", "id": "rhodium-as-rh-soluble-compounds", "pel_mgm3": "0.001", "source_quote": "Rhodium (as Rh), soluble compounds | 7440-16-6 | - | 0.001 | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Rhodium (as Rh), soluble compounds", "title": "Rhodium (as Rh), soluble compounds \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Rhodium (metal fume and insoluble compounds, as Rh)\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Rhodium (metal fume and insoluble compounds, as Rh)\n\n**CAS No.:** 7440-16-6 (metal)\n\n> CAS No. 7440-16-6 (metal)\n\n**NIOSH REL (mg/m\u00b3):** TWA 0.1\n\n> NIOSH REL TWA 0.1 mg/m3\n\nSource: \n", "cas_number": "7440-16-6 (metal)", "file": "rhodium-metal-fume-and-insoluble-compounds-as-rh.md", "generated": true, "harvested": "2026-09-08", "id": "rhodium-metal-fume-and-insoluble-compounds-as-rh", "quote_cas_number": "CAS No. 7440-16-6 (metal)", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Rhodium (metal fume and insoluble compounds, as Rh)", "rel_mgm3": "TWA 0.1", "source_quote": "NIOSH REL TWA 0.1 mg/m3", "sources": ["https://www.cdc.gov/niosh/npg/npgd0544.html"], "stale_after": "2027-09-08", "substance": "Rhodium (metal fume and insoluble compounds, as Rh)", "title": "Rhodium (metal fume and insoluble compounds, as Rh) \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Rhodium, metal\n\n**CAS No.:** 7440166\n\n**PEL (mg/m\u00b3):** 0.1\n\n> 7440166 | | Rhodium, metal | -- | 0.1\n\nSource: \n", "cas_number": "7440166", "file": "rhodium-metal.md", "generated": true, "harvested": "2026-08-05", "id": "rhodium-metal", "pel_mgm3": "0.1", "source_quote": "7440166 | | Rhodium, metal | -- | 0.1", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Rhodium, metal", "title": "Rhodium, metal \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Ronnel\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Ronnel\n\n**CAS No.:** 299-84-3\n\n> CAS No. 299-84-3\n\n**NIOSH REL (mg/m\u00b3):** TWA 10\n\n> NIOSH REL TWA 10 mg/m3\n\nSource: \n", "cas_number": "299-84-3", "file": "ronnel-2.md", "generated": true, "harvested": "2026-09-08", "id": "ronnel-2", "quote_cas_number": "CAS No. 299-84-3", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Ronnel", "rel_mgm3": "TWA 10", "source_quote": "NIOSH REL TWA 10 mg/m3", "sources": ["https://www.cdc.gov/niosh/npg/npgd0546.html"], "stale_after": "2027-09-08", "substance": "Ronnel", "title": "Ronnel \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Ronnel; o,o-dimethyl o-(2,4,5-trichlorophenyl) phosphorothioite\n\n**CAS No.:** 299843\n\n**PEL (mg/m\u00b3):** 10\n\n> 299843 | | Ronnel; o,o-dimethyl o-(2,4,5-trichlorophenyl) phosphorothioite | -- | 10\n\nSource: \n", "cas_number": "299843", "file": "ronnel-o-o-dimethyl-o-2-4-5-trichlorophenyl-phosphorothioite.md", "generated": true, "harvested": "2026-08-05", "id": "ronnel-o-o-dimethyl-o-2-4-5-trichlorophenyl-phosphorothioite", "pel_mgm3": "10", "source_quote": "299843 | | Ronnel; o,o-dimethyl o-(2,4,5-trichlorophenyl) phosphorothioite | -- | 10", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Ronnel; o,o-dimethyl o-(2,4,5-trichlorophenyl) phosphorothioite", "title": "Ronnel; o,o-dimethyl o-(2,4,5-trichlorophenyl) phosphorothioite \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Ronnel\n\n**CAS No.:** 299-84-3\n\n**PEL (mg/m\u00b3):** 15\n\n> Ronnel | 299-84-3 | - | 15 | - |\n\nSource: \n", "cas_number": "299-84-3", "file": "ronnel.md", "generated": true, "harvested": "2026-08-05", "id": "ronnel", "pel_mgm3": "15", "source_quote": "Ronnel | 299-84-3 | - | 15 | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Ronnel", "title": "Ronnel \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Rotenone\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Rotenone\n\n**CAS No.:** 83-79-4\n\n> CAS No. 83-79-4\n\n**NIOSH REL (mg/m\u00b3):** TWA 5\n\n> NIOSH REL TWA 5 mg/m3\n\nSource: \n", "cas_number": "83-79-4", "file": "rotenone-2.md", "generated": true, "harvested": "2026-09-08", "id": "rotenone-2", "quote_cas_number": "CAS No. 83-79-4", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Rotenone", "rel_mgm3": "TWA 5", "source_quote": "NIOSH REL TWA 5 mg/m3", "sources": ["https://www.cdc.gov/niosh/npg/npgd0548.html"], "stale_after": "2027-09-08", "substance": "Rotenone", "title": "Rotenone \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Rotenone, commercial\n\n**CAS No.:** 83794\n\n**PEL (mg/m\u00b3):** 5\n\n> 83794 | | Rotenone, commercial | -- | 5\n\nSource: \n", "cas_number": "83794", "file": "rotenone-commercial.md", "generated": true, "harvested": "2026-08-05", "id": "rotenone-commercial", "pel_mgm3": "5", "source_quote": "83794 | | Rotenone, commercial | -- | 5", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Rotenone, commercial", "title": "Rotenone, commercial \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Rotenone\n\n**CAS No.:** 83-79-4\n\n**PEL (mg/m\u00b3):** 5\n\n> Rotenone | 83-79-4 | - | 5 | - |\n\nSource: \n", "cas_number": "83-79-4", "file": "rotenone.md", "generated": true, "harvested": "2026-08-05", "id": "rotenone", "pel_mgm3": "5", "source_quote": "Rotenone | 83-79-4 | - | 5 | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Rotenone", "title": "Rotenone \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Rouge; see Particulates not otherwise regulated\n\n**CAS No.:** 1309371\n\n> 1309371 | | Rouge; see Particulates not otherwise regulated\n\nSource: \n", "cas_number": "1309371", "file": "rouge-see-particulates-not-otherwise-regulated.md", "generated": true, "harvested": "2026-08-05", "id": "rouge-see-particulates-not-otherwise-regulated", "source_quote": "1309371 | | Rouge; see Particulates not otherwise regulated", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Rouge; see Particulates not otherwise regulated", "title": "Rouge; see Particulates not otherwise regulated \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Rouge\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Rouge\n\n**CAS No.:** 1309-37-1\n\n> CAS No. 1309-37-1\n\n**NIOSH REL, as stated:** See Appendix D\n\n> NIOSH REL See Appendix D\n\nSource: \n", "cas_number": "1309-37-1", "file": "rouge.md", "generated": true, "harvested": "2026-09-08", "id": "rouge", "quote_cas_number": "CAS No. 1309-37-1", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Rouge", "rel_statement": "See Appendix D", "source_quote": "NIOSH REL See Appendix D", "sources": ["https://www.cdc.gov/niosh/npg/npgd0549.html"], "stale_after": "2027-09-08", "substance": "Rouge", "title": "Rouge \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** sec-Amyl acetate\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - sec-Amyl acetate\n\n**CAS No.:** 626-38-0\n\n> CAS No. 626-38-0\n\n**NIOSH REL (ppm):** TWA 125\n\n**NIOSH REL (mg/m\u00b3):** 650\n\n> NIOSH REL TWA 125 ppm (650 mg/m3)\n\nSource: \n", "cas_number": "626-38-0", "file": "sec-amyl-acetate-2.md", "generated": true, "harvested": "2026-09-08", "id": "sec-amyl-acetate-2", "quote_cas_number": "CAS No. 626-38-0", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - sec-Amyl acetate", "rel_mgm3": "650", "rel_ppm": "TWA 125", "source_quote": "NIOSH REL TWA 125 ppm (650 mg/m3)", "sources": ["https://www.cdc.gov/niosh/npg/npgd0032.html"], "stale_after": "2027-09-08", "substance": "sec-Amyl acetate", "title": "sec-Amyl acetate \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** sec-Amyl acetate (all isomers and mixtures); see Pentyl acetate\n\n**CAS No.:** 626380\n\n> 626380 | | sec-Amyl acetate (all isomers and mixtures); see Pentyl acetate\n\nSource: \n", "cas_number": "626380", "file": "sec-amyl-acetate-all-isomers-and-mixtures-see-pentyl-acetate.md", "generated": true, "harvested": "2026-08-05", "id": "sec-amyl-acetate-all-isomers-and-mixtures-see-pentyl-acetate", "source_quote": "626380 | | sec-Amyl acetate (all isomers and mixtures); see Pentyl acetate", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "sec-Amyl acetate (all isomers and mixtures); see Pentyl acetate", "title": "sec-Amyl acetate (all isomers and mixtures); see Pentyl acetate \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** sec-Amyl acetate\n\n**CAS No.:** 626-38-0\n\n**PEL (ppm):** 125\n\n**PEL (mg/m\u00b3):** 650\n\n> sec-Amyl acetate | 626-38-0 | 125 | 650 | - |\n\nSource: \n", "cas_number": "626-38-0", "file": "sec-amyl-acetate.md", "generated": true, "harvested": "2026-08-05", "id": "sec-amyl-acetate", "pel_mgm3": "650", "pel_ppm": "125", "source_quote": "sec-Amyl acetate | 626-38-0 | 125 | 650 | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "sec-Amyl acetate", "title": "sec-Amyl acetate \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** sec-Butyl acetate\n\n**CAS No.:** 105464\n\n**PEL (ppm):** 200\n\n**PEL (mg/m\u00b3):** 950\n\n> 105464 | | sec-Butyl acetate | 200 | 950\n\nSource: \n", "cas_number": "105464", "file": "sec-butyl-acetate-2.md", "generated": true, "harvested": "2026-08-05", "id": "sec-butyl-acetate-2", "pel_mgm3": "950", "pel_ppm": "200", "source_quote": "105464 | | sec-Butyl acetate | 200 | 950", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "sec-Butyl acetate", "title": "sec-Butyl acetate \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** sec-Butyl acetate\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - sec-Butyl acetate\n\n**CAS No.:** 105-46-4\n\n> CAS No. 105-46-4\n\n**NIOSH REL (ppm):** TWA 200\n\n**NIOSH REL (mg/m\u00b3):** 950\n\n> NIOSH REL TWA 200 ppm (950 mg/m3)\n\nSource: \n", "cas_number": "105-46-4", "file": "sec-butyl-acetate-3.md", "generated": true, "harvested": "2026-09-08", "id": "sec-butyl-acetate-3", "quote_cas_number": "CAS No. 105-46-4", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - sec-Butyl acetate", "rel_mgm3": "950", "rel_ppm": "TWA 200", "source_quote": "NIOSH REL TWA 200 ppm (950 mg/m3)", "sources": ["https://www.cdc.gov/niosh/npg/npgd0073.html"], "stale_after": "2027-09-08", "substance": "sec-Butyl acetate", "title": "sec-Butyl acetate \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** sec-Butyl acetate\n\n**CAS No.:** 105-46-4\n\n**PEL (ppm):** 200\n\n**PEL (mg/m\u00b3):** 950\n\n> sec-Butyl acetate | 105-46-4 | 200 | 950 | - |\n\nSource: \n", "cas_number": "105-46-4", "file": "sec-butyl-acetate.md", "generated": true, "harvested": "2026-08-05", "id": "sec-butyl-acetate", "pel_mgm3": "950", "pel_ppm": "200", "source_quote": "sec-Butyl acetate | 105-46-4 | 200 | 950 | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "sec-Butyl acetate", "title": "sec-Butyl acetate \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** sec-Butyl alcohol\n\n**CAS No.:** 78922\n\n**PEL (ppm):** 100\n\n**PEL (mg/m\u00b3):** 305\n\n> 78922 | | sec-Butyl alcohol | 100 | 305\n\nSource: \n", "cas_number": "78922", "file": "sec-butyl-alcohol-2.md", "generated": true, "harvested": "2026-08-05", "id": "sec-butyl-alcohol-2", "pel_mgm3": "305", "pel_ppm": "100", "source_quote": "78922 | | sec-Butyl alcohol | 100 | 305", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "sec-Butyl alcohol", "title": "sec-Butyl alcohol \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** sec-Butyl alcohol\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - sec-Butyl alcohol\n\n**CAS No.:** 78-92-2\n\n> CAS No. 78-92-2\n\n**NIOSH REL (ppm):** TWA 100\n\n**NIOSH REL (mg/m\u00b3):** 305\n\n> NIOSH REL TWA 100 ppm (305 mg/m3) ST 150 ppm (455 mg/m3)\n\nSource: \n", "cas_number": "78-92-2", "file": "sec-butyl-alcohol-3.md", "generated": true, "harvested": "2026-09-08", "id": "sec-butyl-alcohol-3", "quote_cas_number": "CAS No. 78-92-2", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - sec-Butyl alcohol", "rel_mgm3": "305", "rel_ppm": "TWA 100", "source_quote": "NIOSH REL TWA 100 ppm (305 mg/m3) ST 150 ppm (455 mg/m3)", "sources": ["https://www.cdc.gov/niosh/npg/npgd0077.html"], "stale_after": "2027-09-08", "substance": "sec-Butyl alcohol", "title": "sec-Butyl alcohol \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** sec-Butyl alcohol\n\n**CAS No.:** 78-92-2\n\n**PEL (ppm):** 150\n\n**PEL (mg/m\u00b3):** 450\n\n> sec-Butyl alcohol | 78-92-2 | 150 | 450 | - |\n\nSource: \n", "cas_number": "78-92-2", "file": "sec-butyl-alcohol.md", "generated": true, "harvested": "2026-08-05", "id": "sec-butyl-alcohol", "pel_mgm3": "450", "pel_ppm": "150", "source_quote": "sec-Butyl alcohol | 78-92-2 | 150 | 450 | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "sec-Butyl alcohol", "title": "sec-Butyl alcohol \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** sec-Hexyl acetate\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - sec-Hexyl acetate\n\n**CAS No.:** 108-84-9\n\n> CAS No. 108-84-9\n\n**NIOSH REL (ppm):** TWA 50\n\n**NIOSH REL (mg/m\u00b3):** 300\n\n> NIOSH REL TWA 50 ppm (300 mg/m3)\n\nSource: \n", "cas_number": "108-84-9", "file": "sec-hexyl-acetate-2.md", "generated": true, "harvested": "2026-09-08", "id": "sec-hexyl-acetate-2", "quote_cas_number": "CAS No. 108-84-9", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - sec-Hexyl acetate", "rel_mgm3": "300", "rel_ppm": "TWA 50", "source_quote": "NIOSH REL TWA 50 ppm (300 mg/m3)", "sources": ["https://www.cdc.gov/niosh/npg/npgd0327.html"], "stale_after": "2027-09-08", "substance": "sec-Hexyl acetate", "title": "sec-Hexyl acetate \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** sec-Hexyl acetate; 4-methyl-2-pentyl acetate; 1,3-dimethyl-butyl acetate\n\n**CAS No.:** 108849\n\n**PEL (ppm):** 50\n\n**PEL (mg/m\u00b3):** 300\n\n> 108849 | | sec-Hexyl acetate; 4-methyl-2-pentyl acetate; 1,3-dimethyl-butyl acetate | 50 | 300\n\nSource: \n", "cas_number": "108849", "file": "sec-hexyl-acetate-4-methyl-2-pentyl-acetate-1-3-dimethyl-butyl-acetate.md", "generated": true, "harvested": "2026-08-05", "id": "sec-hexyl-acetate-4-methyl-2-pentyl-acetate-1-3-dimethyl-butyl-acetate", "pel_mgm3": "300", "pel_ppm": "50", "source_quote": "108849 | | sec-Hexyl acetate; 4-methyl-2-pentyl acetate; 1,3-dimethyl-butyl acetate | 50 | 300", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "sec-Hexyl acetate; 4-methyl-2-pentyl acetate; 1,3-dimethyl-butyl acetate", "title": "sec-Hexyl acetate; 4-methyl-2-pentyl acetate; 1,3-dimethyl-butyl acetate \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** sec-Hexyl acetate\n\n**CAS No.:** 108-84-9\n\n**PEL (ppm):** 50\n\n**PEL (mg/m\u00b3):** 300\n\n> sec-Hexyl acetate | 108-84-9 | 50 | 300 | - |\n\nSource: \n", "cas_number": "108-84-9", "file": "sec-hexyl-acetate.md", "generated": true, "harvested": "2026-08-05", "id": "sec-hexyl-acetate", "pel_mgm3": "300", "pel_ppm": "50", "source_quote": "sec-Hexyl acetate | 108-84-9 | 50 | 300 | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "sec-Hexyl acetate", "title": "sec-Hexyl acetate \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Selenium compounds (as Se)\n\n**CAS No.:** 7782-49-2\n\n**PEL (mg/m\u00b3):** 0.2\n\n> Selenium compounds (as Se) | 7782-49-2 | - | 0.2 | - |\n\nSource: \n", "cas_number": "7782-49-2", "file": "selenium-compounds-as-se.md", "generated": true, "harvested": "2026-08-05", "id": "selenium-compounds-as-se", "pel_mgm3": "0.2", "source_quote": "Selenium compounds (as Se) | 7782-49-2 | - | 0.2 | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Selenium compounds (as Se)", "title": "Selenium compounds (as Se) \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Selenium hexafluoride\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Selenium hexafluoride\n\n**CAS No.:** 7783-79-1\n\n> CAS No. 7783-79-1\n\n**NIOSH REL (ppm):** TWA 0.05\n\n> NIOSH REL TWA 0.05 ppm\n\nSource: \n", "cas_number": "7783-79-1", "file": "selenium-hexafluoride-2.md", "generated": true, "harvested": "2026-09-08", "id": "selenium-hexafluoride-2", "quote_cas_number": "CAS No. 7783-79-1", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Selenium hexafluoride", "rel_ppm": "TWA 0.05", "source_quote": "NIOSH REL TWA 0.05 ppm", "sources": ["https://www.cdc.gov/niosh/npg/npgd0551.html"], "stale_after": "2027-09-08", "substance": "Selenium hexafluoride", "title": "Selenium hexafluoride \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Selenium hexafluoride (as Se)\n\n**CAS No.:** 7783-79-1\n\n**PEL (ppm):** 0.05\n\n**PEL (mg/m\u00b3):** 0.4\n\n> Selenium hexafluoride (as Se) | 7783-79-1 | 0.05 | 0.4 | - |\n\nSource: \n", "cas_number": "7783-79-1", "file": "selenium-hexafluoride-as-se.md", "generated": true, "harvested": "2026-08-05", "id": "selenium-hexafluoride-as-se", "pel_mgm3": "0.4", "pel_ppm": "0.05", "source_quote": "Selenium hexafluoride (as Se) | 7783-79-1 | 0.05 | 0.4 | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Selenium hexafluoride (as Se)", "title": "Selenium hexafluoride (as Se) \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Selenium hexafluoride\n\n**CAS No.:** 7783791\n\n**PEL (ppm):** 0.05\n\n**PEL (mg/m\u00b3):** 0.4\n\n> 7783791 | | Selenium hexafluoride | 0.05 | 0.4\n\nSource: \n", "cas_number": "7783791", "file": "selenium-hexafluoride.md", "generated": true, "harvested": "2026-08-05", "id": "selenium-hexafluoride", "pel_mgm3": "0.4", "pel_ppm": "0.05", "source_quote": "7783791 | | Selenium hexafluoride | 0.05 | 0.4", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Selenium hexafluoride", "title": "Selenium hexafluoride \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Selenium\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Selenium\n\n**CAS No.:** 7782-49-2\n\n> CAS No. 7782-49-2\n\n**NIOSH REL (mg/m\u00b3):** TWA 0.2\n\n> NIOSH REL TWA 0.2 mg/m3\n\nSource: \n", "cas_number": "7782-49-2", "file": "selenium.md", "generated": true, "harvested": "2026-09-08", "id": "selenium", "quote_cas_number": "CAS No. 7782-49-2", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Selenium", "rel_mgm3": "TWA 0.2", "source_quote": "NIOSH REL TWA 0.2 mg/m3", "sources": ["https://www.cdc.gov/niosh/npg/npgd0550.html"], "stale_after": "2027-09-08", "substance": "Selenium", "title": "Selenium \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Sesone; sodium 2,4-dichloro-phenoxyethyl sulfate\n\n**CAS No.:** 136787\n\n> 136787 | | Sesone; sodium 2,4-dichloro-phenoxyethyl sulfate\n\nSource: \n", "cas_number": "136787", "file": "sesone-sodium-2-4-dichloro-phenoxyethyl-sulfate.md", "generated": true, "harvested": "2026-08-05", "id": "sesone-sodium-2-4-dichloro-phenoxyethyl-sulfate", "source_quote": "136787 | | Sesone; sodium 2,4-dichloro-phenoxyethyl sulfate", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Sesone; sodium 2,4-dichloro-phenoxyethyl sulfate", "title": "Sesone; sodium 2,4-dichloro-phenoxyethyl sulfate \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Silica, amorphous, diatomaceous earth, containing less than 1% crystalline silica\n\n**CAS No.:** 61790-53-2\n\n> Silica, amorphous, diatomaceous earth, containing less than 1% crystalline silica | 61790-53-2 | - | (3) | - |\n\nSource: \n", "cas_number": "61790-53-2", "file": "silica-amorphous-diatomaceous-earth-containing-less-than-1-crystalline-silica.md", "generated": true, "harvested": "2026-08-05", "id": "silica-amorphous-diatomaceous-earth-containing-less-than-1-crystalline-silica", "source_quote": "Silica, amorphous, diatomaceous earth, containing less than 1% crystalline silica | 61790-53-2 | - | (3) | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Silica, amorphous, diatomaceous earth, containing less than 1% crystalline silica", "title": "Silica, amorphous, diatomaceous earth, containing less than 1% crystalline silica \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Silica, amorphous Diatomaceous earth\n\n**CAS No.:** 61790532\n\n> 61790532 | | Silica, amorphous Diatomaceous earth\n\nSource: \n", "cas_number": "61790532", "file": "silica-amorphous-diatomaceous-earth.md", "generated": true, "harvested": "2026-08-05", "id": "silica-amorphous-diatomaceous-earth", "source_quote": "61790532 | | Silica, amorphous Diatomaceous earth", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Silica, amorphous Diatomaceous earth", "title": "Silica, amorphous Diatomaceous earth \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Silica, amorphous, precipitated and gel\n\n**CAS No.:** 112926-00-8\n\n> Silica, amorphous, precipitated and gel | 112926-00-8 | - | (3) | - |\n\nSource: \n", "cas_number": "112926-00-8", "file": "silica-amorphous-precipitated-and-gel.md", "generated": true, "harvested": "2026-08-05", "id": "silica-amorphous-precipitated-and-gel", "source_quote": "Silica, amorphous, precipitated and gel | 112926-00-8 | - | (3) | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Silica, amorphous, precipitated and gel", "title": "Silica, amorphous, precipitated and gel \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Silica, amorphous\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Silica, amorphous\n\n**CAS No.:** 7631-86-9\n\n> CAS No. 7631-86-9\n\n**NIOSH REL (mg/m\u00b3):** TWA 6\n\n> NIOSH REL TWA 6 mg/m3\n\nSource: \n", "cas_number": "7631-86-9", "file": "silica-amorphous.md", "generated": true, "harvested": "2026-09-08", "id": "silica-amorphous", "quote_cas_number": "CAS No. 7631-86-9", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Silica, amorphous", "rel_mgm3": "TWA 6", "source_quote": "NIOSH REL TWA 6 mg/m3", "sources": ["https://www.cdc.gov/niosh/npg/npgd0552.html"], "stale_after": "2027-09-08", "substance": "Silica, amorphous", "title": "Silica, amorphous \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Silica, crystalline (as respirable dust)\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Silica, crystalline (as respirable dust)\n\n**CAS No.:** 14808-60-7\n\n> CAS No. 14808-60-7\n\n**NIOSH REL (mg/m\u00b3):** TWA 0.05\n\n> NIOSH REL Ca TWA 0.05 mg/m\u00b3\n\nSource: \n", "cas_number": "14808-60-7", "file": "silica-crystalline-as-respirable-dust.md", "generated": true, "harvested": "2026-09-08", "id": "silica-crystalline-as-respirable-dust", "quote_cas_number": "CAS No. 14808-60-7", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Silica, crystalline (as respirable dust)", "rel_mgm3": "TWA 0.05", "source_quote": "NIOSH REL Ca TWA 0.05 mg/m\u00b3", "sources": ["https://www.cdc.gov/niosh/npg/npgd0684.html"], "stale_after": "2027-09-08", "substance": "Silica, crystalline (as respirable dust)", "title": "Silica, crystalline (as respirable dust) \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Silica, fused, respirable dust\n\n**CAS No.:** 60676860\n\n**PEL (mg/m\u00b3):** 0.1\n\n> 60676860 | | Silica, fused, respirable dust | -- | 0.1\n\nSource: \n", "cas_number": "60676860", "file": "silica-fused-respirable-dust-2.md", "generated": true, "harvested": "2026-08-05", "id": "silica-fused-respirable-dust-2", "pel_mgm3": "0.1", "source_quote": "60676860 | | Silica, fused, respirable dust | -- | 0.1", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Silica, fused, respirable dust", "title": "Silica, fused, respirable dust \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Silica, fused, respirable dust\n\n**CAS No.:** 60676-86-0\n\n> Silica, fused, respirable dust | 60676-86-0 | - | (3) | - |\n\nSource: \n", "cas_number": "60676-86-0", "file": "silica-fused-respirable-dust.md", "generated": true, "harvested": "2026-08-05", "id": "silica-fused-respirable-dust", "source_quote": "Silica, fused, respirable dust | 60676-86-0 | - | (3) | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Silica, fused, respirable dust", "title": "Silica, fused, respirable dust \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Silicon\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Silicon\n\n**CAS No.:** 7440-21-3\n\n> CAS No. 7440-21-3\n\n**NIOSH REL, as stated:** TWA 10 mg/m3 (total) TWA 5 mg/m3 (resp)\n\n> NIOSH REL TWA 10 mg/m3 (total) TWA 5 mg/m3 (resp)\n\nSource: \n", "cas_number": "7440-21-3", "file": "silicon-2.md", "generated": true, "harvested": "2026-09-08", "id": "silicon-2", "quote_cas_number": "CAS No. 7440-21-3", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Silicon", "rel_statement": "TWA 10 mg/m3 (total) TWA 5 mg/m3 (resp)", "source_quote": "NIOSH REL TWA 10 mg/m3 (total) TWA 5 mg/m3 (resp)", "sources": ["https://www.cdc.gov/niosh/npg/npgd0554.html"], "stale_after": "2027-09-08", "substance": "Silicon", "title": "Silicon \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Silicon carbide\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Silicon carbide\n\n**CAS No.:** 409-21-2\n\n> CAS No. 409-21-2\n\n**NIOSH REL, as stated:** TWA 10 mg/m3 (total) TWA 5 mg/m3 (resp)\n\n> NIOSH REL TWA 10 mg/m3 (total) TWA 5 mg/m3 (resp)\n\nSource: \n", "cas_number": "409-21-2", "file": "silicon-carbide-2.md", "generated": true, "harvested": "2026-09-08", "id": "silicon-carbide-2", "quote_cas_number": "CAS No. 409-21-2", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Silicon carbide", "rel_statement": "TWA 10 mg/m3 (total) TWA 5 mg/m3 (resp)", "source_quote": "NIOSH REL TWA 10 mg/m3 (total) TWA 5 mg/m3 (resp)", "sources": ["https://www.cdc.gov/niosh/npg/npgd0555.html"], "stale_after": "2027-09-08", "substance": "Silicon carbide", "title": "Silicon carbide \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Silicon carbide; SiC; see Particulates not otherwise regulated\n\n**CAS No.:** 409212\n\n> 409212 | | Silicon carbide; SiC; see Particulates not otherwise regulated\n\nSource: \n", "cas_number": "409212", "file": "silicon-carbide-sic-see-particulates-not-otherwise-regulated.md", "generated": true, "harvested": "2026-08-05", "id": "silicon-carbide-sic-see-particulates-not-otherwise-regulated", "source_quote": "409212 | | Silicon carbide; SiC; see Particulates not otherwise regulated", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Silicon carbide; SiC; see Particulates not otherwise regulated", "title": "Silicon carbide; SiC; see Particulates not otherwise regulated \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Silicon carbide\n\n**CAS No.:** 409-21-2\n\n> Silicon carbide | 409-21-2 | - | - | - |\n\nSource: \n", "cas_number": "409-21-2", "file": "silicon-carbide.md", "generated": true, "harvested": "2026-08-05", "id": "silicon-carbide", "source_quote": "Silicon carbide | 409-21-2 | - | - | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Silicon carbide", "title": "Silicon carbide \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Silicon; see Particulates not otherwise regulated\n\n**CAS No.:** 7440213\n\n> 7440213 | | Silicon; see Particulates not otherwise regulated\n\nSource: \n", "cas_number": "7440213", "file": "silicon-see-particulates-not-otherwise-regulated.md", "generated": true, "harvested": "2026-08-05", "id": "silicon-see-particulates-not-otherwise-regulated", "source_quote": "7440213 | | Silicon; see Particulates not otherwise regulated", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Silicon; see Particulates not otherwise regulated", "title": "Silicon; see Particulates not otherwise regulated \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Silicon tetrahydride; silane\n\n**CAS No.:** 7803625\n\n**PEL (ppm):** 5\n\n**PEL (mg/m\u00b3):** 7\n\n> 7803625 | | Silicon tetrahydride; silane | 5 | 7\n\nSource: \n", "cas_number": "7803625", "file": "silicon-tetrahydride-silane.md", "generated": true, "harvested": "2026-08-05", "id": "silicon-tetrahydride-silane", "pel_mgm3": "7", "pel_ppm": "5", "source_quote": "7803625 | | Silicon tetrahydride; silane | 5 | 7", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Silicon tetrahydride; silane", "title": "Silicon tetrahydride; silane \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Silicon tetrahydride\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Silicon tetrahydride\n\n**CAS No.:** 7803-62-5\n\n> CAS No. 7803-62-5\n\n**NIOSH REL (ppm):** TWA 5\n\n**NIOSH REL (mg/m\u00b3):** 7\n\n> NIOSH REL TWA 5 ppm (7 mg/m3)\n\nSource: \n", "cas_number": "7803-62-5", "file": "silicon-tetrahydride.md", "generated": true, "harvested": "2026-09-08", "id": "silicon-tetrahydride", "quote_cas_number": "CAS No. 7803-62-5", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Silicon tetrahydride", "rel_mgm3": "7", "rel_ppm": "TWA 5", "source_quote": "NIOSH REL TWA 5 ppm (7 mg/m3)", "sources": ["https://www.cdc.gov/niosh/npg/npgd0556.html"], "stale_after": "2027-09-08", "substance": "Silicon tetrahydride", "title": "Silicon tetrahydride \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Silicon\n\n**CAS No.:** 7440-21-3\n\n> Silicon | 7440-21-3 | - | - | - |\n\nSource: \n", "cas_number": "7440-21-3", "file": "silicon.md", "generated": true, "harvested": "2026-08-05", "id": "silicon", "source_quote": "Silicon | 7440-21-3 | - | - | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Silicon", "title": "Silicon \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Silver, metal and soluble compounds (as Ag)\n\n**CAS No.:** 7440-22-4\n\n**PEL (mg/m\u00b3):** 0.01\n\n> Silver, metal and soluble compounds (as Ag) | 7440-22-4 | - | 0.01 | - |\n\nSource: \n", "cas_number": "7440-22-4", "file": "silver-metal-and-soluble-compounds-as-ag.md", "generated": true, "harvested": "2026-08-05", "id": "silver-metal-and-soluble-compounds-as-ag", "pel_mgm3": "0.01", "source_quote": "Silver, metal and soluble compounds (as Ag) | 7440-22-4 | - | 0.01 | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Silver, metal and soluble compounds (as Ag)", "title": "Silver, metal and soluble compounds (as Ag) \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Silver metal, as Ag\n\n**CAS No.:** 7440224\n\n**PEL (mg/m\u00b3):** 0.01\n\n> 7440224 | | Silver metal, as Ag | -- | 0.01\n\nSource: \n", "cas_number": "7440224", "file": "silver-metal-as-ag.md", "generated": true, "harvested": "2026-08-05", "id": "silver-metal-as-ag", "pel_mgm3": "0.01", "source_quote": "7440224 | | Silver metal, as Ag | -- | 0.01", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Silver metal, as Ag", "title": "Silver metal, as Ag \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Silver (metal dust and soluble compounds, as Ag)\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Silver (metal dust and soluble compounds, as Ag)\n\n**CAS No.:** 7440-22-4 (metal)\n\n> CAS No. 7440-22-4 (metal)\n\n**NIOSH REL (mg/m\u00b3):** TWA 0.01\n\n> NIOSH REL TWA 0.01 mg/m3\n\nSource: \n", "cas_number": "7440-22-4 (metal)", "file": "silver-metal-dust-and-soluble-compounds-as-ag.md", "generated": true, "harvested": "2026-09-08", "id": "silver-metal-dust-and-soluble-compounds-as-ag", "quote_cas_number": "CAS No. 7440-22-4 (metal)", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Silver (metal dust and soluble compounds, as Ag)", "rel_mgm3": "TWA 0.01", "source_quote": "NIOSH REL TWA 0.01 mg/m3", "sources": ["https://www.cdc.gov/niosh/npg/npgd0557.html"], "stale_after": "2027-09-08", "substance": "Silver (metal dust and soluble compounds, as Ag)", "title": "Silver (metal dust and soluble compounds, as Ag) \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Sodium 2,4-dichlorophenoxyethyl sulfate; see Sesone\n\n**CAS No.:** 136787\n\n> 136787 | | Sodium 2,4-dichlorophenoxyethyl sulfate; see Sesone\n\nSource: \n", "cas_number": "136787", "file": "sodium-2-4-dichlorophenoxyethyl-sulfate-see-sesone.md", "generated": true, "harvested": "2026-08-05", "id": "sodium-2-4-dichlorophenoxyethyl-sulfate-see-sesone", "source_quote": "136787 | | Sodium 2,4-dichlorophenoxyethyl sulfate; see Sesone", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Sodium 2,4-dichlorophenoxyethyl sulfate; see Sesone", "title": "Sodium 2,4-dichlorophenoxyethyl sulfate; see Sesone \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Sodium aluminum fluoride (as F)\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Sodium aluminum fluoride (as F)\n\n**CAS No.:** 15096-52-3\n\n> CAS No. 15096-52-3\n\n**NIOSH REL (mg/m\u00b3):** TWA 2.5\n\n> NIOSH REL TWA 2.5 mg/m3\n\nSource: \n", "cas_number": "15096-52-3", "file": "sodium-aluminum-fluoride-as-f.md", "generated": true, "harvested": "2026-09-08", "id": "sodium-aluminum-fluoride-as-f", "quote_cas_number": "CAS No. 15096-52-3", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Sodium aluminum fluoride (as F)", "rel_mgm3": "TWA 2.5", "source_quote": "NIOSH REL TWA 2.5 mg/m3", "sources": ["https://www.cdc.gov/niosh/npg/npgd0559.html"], "stale_after": "2027-09-08", "substance": "Sodium aluminum fluoride (as F)", "title": "Sodium aluminum fluoride (as F) \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Sodium azide\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Sodium azide\n\n**CAS No.:** 26628-22-8\n\n> CAS No. 26628-22-8\n\n**NIOSH REL, as stated:** C 0.1 ppm (as HN3) [skin] C 0.3 mg/m3 (as NaN3) [skin]\n\n> NIOSH REL C 0.1 ppm (as HN3) [skin] C 0.3 mg/m3 (as NaN3) [skin]\n\nSource: \n", "cas_number": "26628-22-8", "file": "sodium-azide-2.md", "generated": true, "harvested": "2026-09-08", "id": "sodium-azide-2", "quote_cas_number": "CAS No. 26628-22-8", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Sodium azide", "rel_statement": "C 0.1 ppm (as HN3) [skin] C 0.3 mg/m3 (as NaN3) [skin]", "source_quote": "NIOSH REL C 0.1 ppm (as HN3) [skin] C 0.3 mg/m3 (as NaN3) [skin]", "sources": ["https://www.cdc.gov/niosh/npg/npgd0560.html"], "stale_after": "2027-09-08", "substance": "Sodium azide", "title": "Sodium azide \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Sodium azide\n\n**CAS No.:** 26628228\n\n**PEL (ppm):** 0.1\n\n**PEL (mg/m\u00b3):** 0.3\n\n**Ceiling:** C\n\n> 26628228 | S | Sodium azide | 0.1 | 0.3 | C\n\nSource: \n", "cas_number": "26628228", "ceiling": "C", "file": "sodium-azide.md", "generated": true, "harvested": "2026-08-05", "id": "sodium-azide", "pel_mgm3": "0.3", "pel_ppm": "0.1", "source_quote": "26628228 | S | Sodium azide | 0.1 | 0.3 | C", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Sodium azide", "title": "Sodium azide \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Sodium bisulfite\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Sodium bisulfite\n\n**CAS No.:** 7631-90-5\n\n> CAS No. 7631-90-5\n\n**NIOSH REL (mg/m\u00b3):** TWA 5\n\n> NIOSH REL TWA 5 mg/m3\n\nSource: \n", "cas_number": "7631-90-5", "file": "sodium-bisulfite-2.md", "generated": true, "harvested": "2026-09-08", "id": "sodium-bisulfite-2", "quote_cas_number": "CAS No. 7631-90-5", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Sodium bisulfite", "rel_mgm3": "TWA 5", "source_quote": "NIOSH REL TWA 5 mg/m3", "sources": ["https://www.cdc.gov/niosh/npg/npgd0561.html"], "stale_after": "2027-09-08", "substance": "Sodium bisulfite", "title": "Sodium bisulfite \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Sodium bisulfite\n\n**CAS No.:** 7631905\n\n**PEL (mg/m\u00b3):** 5\n\n> 7631905 | | Sodium bisulfite | -- | 5\n\nSource: \n", "cas_number": "7631905", "file": "sodium-bisulfite.md", "generated": true, "harvested": "2026-08-05", "id": "sodium-bisulfite", "pel_mgm3": "5", "source_quote": "7631905 | | Sodium bisulfite | -- | 5", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Sodium bisulfite", "title": "Sodium bisulfite \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Sodium cyanide (as CN)\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Sodium cyanide (as CN)\n\n**CAS No.:** 143-33-9\n\n> CAS No. 143-33-9\n\n**NIOSH REL (ppm):** 4.7\n\n**NIOSH REL (mg/m\u00b3):** C 5\n\n> NIOSH REL C 5 mg/m3 (4.7 ppm) [10-minute]\n\nSource: \n", "cas_number": "143-33-9", "file": "sodium-cyanide-as-cn.md", "generated": true, "harvested": "2026-09-08", "id": "sodium-cyanide-as-cn", "quote_cas_number": "CAS No. 143-33-9", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Sodium cyanide (as CN)", "rel_mgm3": "C 5", "rel_ppm": "4.7", "source_quote": "NIOSH REL C 5 mg/m3 (4.7 ppm) [10-minute]", "sources": ["https://www.cdc.gov/niosh/npg/npgd0562.html"], "stale_after": "2027-09-08", "substance": "Sodium cyanide (as CN)", "title": "Sodium cyanide (as CN) \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Sodium fluoride (as F)\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Sodium fluoride (as F)\n\n**CAS No.:** 7681-49-4\n\n> CAS No. 7681-49-4\n\n**NIOSH REL (mg/m\u00b3):** TWA 2.5\n\n> NIOSH REL TWA 2.5 mg/m3\n\nSource: \n", "cas_number": "7681-49-4", "file": "sodium-fluoride-as-f.md", "generated": true, "harvested": "2026-09-08", "id": "sodium-fluoride-as-f", "quote_cas_number": "CAS No. 7681-49-4", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Sodium fluoride (as F)", "rel_mgm3": "TWA 2.5", "source_quote": "NIOSH REL TWA 2.5 mg/m3", "sources": ["https://www.cdc.gov/niosh/npg/npgd0563.html"], "stale_after": "2027-09-08", "substance": "Sodium fluoride (as F)", "title": "Sodium fluoride (as F) \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Sodium fluoroacetate\n\n**CAS No.:** 62748\n\n**PEL (mg/m\u00b3):** 0.05\n\n**STEL (mg/m\u00b3):** 0.15\n\n> 62748 | S | Sodium fluoroacetate | -- | 0.05 | | -- | 0.15\n\nSource: \n", "cas_number": "62748", "file": "sodium-fluoroacetate-2.md", "generated": true, "harvested": "2026-08-05", "id": "sodium-fluoroacetate-2", "pel_mgm3": "0.05", "source_quote": "62748 | S | Sodium fluoroacetate | -- | 0.05 | | -- | 0.15", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "stel_mgm3": "0.15", "substance": "Sodium fluoroacetate", "title": "Sodium fluoroacetate \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Sodium fluoroacetate\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Sodium fluoroacetate\n\n**CAS No.:** 62-74-8\n\n> CAS No. 62-74-8\n\n**NIOSH REL (mg/m\u00b3):** TWA 0.05\n\n> NIOSH REL TWA 0.05 mg/m3 ST 0.15 mg/m3 [skin]\n\nSource: \n", "cas_number": "62-74-8", "file": "sodium-fluoroacetate-3.md", "generated": true, "harvested": "2026-09-08", "id": "sodium-fluoroacetate-3", "quote_cas_number": "CAS No. 62-74-8", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Sodium fluoroacetate", "rel_mgm3": "TWA 0.05", "source_quote": "NIOSH REL TWA 0.05 mg/m3 ST 0.15 mg/m3 [skin]", "sources": ["https://www.cdc.gov/niosh/npg/npgd0564.html"], "stale_after": "2027-09-08", "substance": "Sodium fluoroacetate", "title": "Sodium fluoroacetate \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Sodium fluoroacetate\n\n**CAS No.:** 62-74-8\n\n**PEL (mg/m\u00b3):** 0.05\n\n> Sodium fluoroacetate | 62-74-8 | - | 0.05 | X |\n\nSource: \n", "cas_number": "62-74-8", "file": "sodium-fluoroacetate.md", "generated": true, "harvested": "2026-08-05", "id": "sodium-fluoroacetate", "pel_mgm3": "0.05", "source_quote": "Sodium fluoroacetate | 62-74-8 | - | 0.05 | X |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Sodium fluoroacetate", "title": "Sodium fluoroacetate \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Sodium hydroxide\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Sodium hydroxide\n\n**CAS No.:** 1310-73-2\n\n> CAS No. 1310-73-2\n\n**NIOSH REL (mg/m\u00b3):** C 2\n\n> NIOSH REL C 2 mg/m3\n\nSource: \n", "cas_number": "1310-73-2", "file": "sodium-hydroxide-2.md", "generated": true, "harvested": "2026-09-08", "id": "sodium-hydroxide-2", "quote_cas_number": "CAS No. 1310-73-2", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Sodium hydroxide", "rel_mgm3": "C 2", "source_quote": "NIOSH REL C 2 mg/m3", "sources": ["https://www.cdc.gov/niosh/npg/npgd0565.html"], "stale_after": "2027-09-08", "substance": "Sodium hydroxide", "title": "Sodium hydroxide \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Sodium hydroxide; caustic soda\n\n**CAS No.:** 1310732\n\n**PEL (mg/m\u00b3):** 2\n\n**Ceiling:** C\n\n> 1310732 | | Sodium hydroxide; caustic soda | -- | 2 | C\n\nSource: \n", "cas_number": "1310732", "ceiling": "C", "file": "sodium-hydroxide-caustic-soda.md", "generated": true, "harvested": "2026-08-05", "id": "sodium-hydroxide-caustic-soda", "pel_mgm3": "2", "source_quote": "1310732 | | Sodium hydroxide; caustic soda | -- | 2 | C", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Sodium hydroxide; caustic soda", "title": "Sodium hydroxide; caustic soda \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Sodium hydroxide\n\n**CAS No.:** 1310-73-2\n\n**PEL (mg/m\u00b3):** 2\n\n> Sodium hydroxide | 1310-73-2 | - | 2 | - |\n\nSource: \n", "cas_number": "1310-73-2", "file": "sodium-hydroxide.md", "generated": true, "harvested": "2026-08-05", "id": "sodium-hydroxide", "pel_mgm3": "2", "source_quote": "Sodium hydroxide | 1310-73-2 | - | 2 | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Sodium hydroxide", "title": "Sodium hydroxide \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Sodium metabisulfite\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Sodium metabisulfite\n\n**CAS No.:** 7681-57-4\n\n> CAS No. 7681-57-4\n\n**NIOSH REL (mg/m\u00b3):** TWA 5\n\n> NIOSH REL TWA 5 mg/m3\n\nSource: \n", "cas_number": "7681-57-4", "file": "sodium-metabisulfite-2.md", "generated": true, "harvested": "2026-09-08", "id": "sodium-metabisulfite-2", "quote_cas_number": "CAS No. 7681-57-4", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Sodium metabisulfite", "rel_mgm3": "TWA 5", "source_quote": "NIOSH REL TWA 5 mg/m3", "sources": ["https://www.cdc.gov/niosh/npg/npgd0566.html"], "stale_after": "2027-09-08", "substance": "Sodium metabisulfite", "title": "Sodium metabisulfite \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Sodium metabisulfite\n\n**CAS No.:** 7681574\n\n**PEL (mg/m\u00b3):** 5\n\n> 7681574 | | Sodium metabisulfite | -- | 5\n\nSource: \n", "cas_number": "7681574", "file": "sodium-metabisulfite.md", "generated": true, "harvested": "2026-08-05", "id": "sodium-metabisulfite", "pel_mgm3": "5", "source_quote": "7681574 | | Sodium metabisulfite | -- | 5", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Sodium metabisulfite", "title": "Sodium metabisulfite \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Sodium stearate\n\n**CAS No.:** 822162\n\n**PEL (mg/m\u00b3):** 10\n\n> 822162 | | Sodium stearate | -- | 10\n\nSource: \n", "cas_number": "822162", "file": "sodium-stearate.md", "generated": true, "harvested": "2026-08-05", "id": "sodium-stearate", "pel_mgm3": "10", "source_quote": "822162 | | Sodium stearate | -- | 10", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Sodium stearate", "title": "Sodium stearate \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Starch\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Starch\n\n**CAS No.:** 9005-25-8\n\n> CAS No. 9005-25-8\n\n**NIOSH REL, as stated:** TWA 10 mg/m3 (total) TWA 5 mg/m3 (resp)\n\n> NIOSH REL TWA 10 mg/m3 (total) TWA 5 mg/m3 (resp)\n\nSource: \n", "cas_number": "9005-25-8", "file": "starch-2.md", "generated": true, "harvested": "2026-09-08", "id": "starch-2", "quote_cas_number": "CAS No. 9005-25-8", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Starch", "rel_statement": "TWA 10 mg/m3 (total) TWA 5 mg/m3 (resp)", "source_quote": "NIOSH REL TWA 10 mg/m3 (total) TWA 5 mg/m3 (resp)", "sources": ["https://www.cdc.gov/niosh/npg/npgd0567.html"], "stale_after": "2027-09-08", "substance": "Starch", "title": "Starch \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Starch; see Particulates not otherwise regulated\n\n**CAS No.:** 9005258\n\n> 9005258 | | Starch; see Particulates not otherwise regulated\n\nSource: \n", "cas_number": "9005258", "file": "starch-see-particulates-not-otherwise-regulated.md", "generated": true, "harvested": "2026-08-05", "id": "starch-see-particulates-not-otherwise-regulated", "source_quote": "9005258 | | Starch; see Particulates not otherwise regulated", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Starch; see Particulates not otherwise regulated", "title": "Starch; see Particulates not otherwise regulated \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Starch\n\n**CAS No.:** 9005-25-8\n\n> Starch | 9005-25-8 | - | - | - |\n\nSource: \n", "cas_number": "9005-25-8", "file": "starch.md", "generated": true, "harvested": "2026-08-05", "id": "starch", "source_quote": "Starch | 9005-25-8 | - | - | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Starch", "title": "Starch \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Stibine\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Stibine\n\n**CAS No.:** 7803-52-3\n\n> CAS No. 7803-52-3\n\n**NIOSH REL (ppm):** TWA 0.1\n\n**NIOSH REL (mg/m\u00b3):** 0.5\n\n> NIOSH REL TWA 0.1 ppm (0.5 mg/m3)\n\nSource: \n", "cas_number": "7803-52-3", "file": "stibine-2.md", "generated": true, "harvested": "2026-09-08", "id": "stibine-2", "quote_cas_number": "CAS No. 7803-52-3", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Stibine", "rel_mgm3": "0.5", "rel_ppm": "TWA 0.1", "source_quote": "NIOSH REL TWA 0.1 ppm (0.5 mg/m3)", "sources": ["https://www.cdc.gov/niosh/npg/npgd0568.html"], "stale_after": "2027-09-08", "substance": "Stibine", "title": "Stibine \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Stibine; SbH$3\n\n**CAS No.:** 7803523\n\n**PEL (ppm):** 0.1\n\n**PEL (mg/m\u00b3):** 0.5\n\n> 7803523 | | Stibine; SbH$3 | 0.1 | 0.5\n\nSource: \n", "cas_number": "7803523", "file": "stibine-sbh-3.md", "generated": true, "harvested": "2026-08-05", "id": "stibine-sbh-3", "pel_mgm3": "0.5", "pel_ppm": "0.1", "source_quote": "7803523 | | Stibine; SbH$3 | 0.1 | 0.5", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Stibine; SbH$3", "title": "Stibine; SbH $3 \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Stibine\n\n**CAS No.:** 7803-52-3\n\n**PEL (ppm):** 0.1\n\n**PEL (mg/m\u00b3):** 0.5\n\n> Stibine | 7803-52-3 | 0.1 | 0.5 | - |\n\nSource: \n", "cas_number": "7803-52-3", "file": "stibine.md", "generated": true, "harvested": "2026-08-05", "id": "stibine", "pel_mgm3": "0.5", "pel_ppm": "0.1", "source_quote": "Stibine | 7803-52-3 | 0.1 | 0.5 | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Stibine", "title": "Stibine \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Stoddard solvent\n\n**CAS No.:** 8052413\n\n**PEL (ppm):** 100\n\n**PEL (mg/m\u00b3):** 525\n\n> 8052413 | | Stoddard solvent | 100 | 525\n\nSource: \n", "cas_number": "8052413", "file": "stoddard-solvent-2.md", "generated": true, "harvested": "2026-08-05", "id": "stoddard-solvent-2", "pel_mgm3": "525", "pel_ppm": "100", "source_quote": "8052413 | | Stoddard solvent | 100 | 525", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Stoddard solvent", "title": "Stoddard solvent \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Stoddard solvent\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Stoddard solvent\n\n**CAS No.:** 8052-41-3\n\n> CAS No. 8052-41-3\n\n**NIOSH REL (mg/m\u00b3):** TWA 350\n\n> NIOSH REL TWA 350 mg/m3 C 1800 mg/m3 [15-minute]\n\nSource: \n", "cas_number": "8052-41-3", "file": "stoddard-solvent-3.md", "generated": true, "harvested": "2026-09-08", "id": "stoddard-solvent-3", "quote_cas_number": "CAS No. 8052-41-3", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Stoddard solvent", "rel_mgm3": "TWA 350", "source_quote": "NIOSH REL TWA 350 mg/m3 C 1800 mg/m3 [15-minute]", "sources": ["https://www.cdc.gov/niosh/npg/npgd0569.html"], "stale_after": "2027-09-08", "substance": "Stoddard solvent", "title": "Stoddard solvent \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Stoddard solvent\n\n**CAS No.:** 8052-41-3\n\n**PEL (ppm):** 500\n\n**PEL (mg/m\u00b3):** 2900\n\n> Stoddard solvent | 8052-41-3 | 500 | 2900 | - |\n\nSource: \n", "cas_number": "8052-41-3", "file": "stoddard-solvent.md", "generated": true, "harvested": "2026-08-05", "id": "stoddard-solvent", "pel_mgm3": "2900", "pel_ppm": "500", "source_quote": "Stoddard solvent | 8052-41-3 | 500 | 2900 | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Stoddard solvent", "title": "Stoddard solvent \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Strontium chromate, as Cr (see also Sections 1532.2, 5206 & 8359) Stearates; see specific compound\n\n**CAS No.:** 7789062\n\n**PEL (mg/m\u00b3):** 0.0005\n\n> 7789062 | | Strontium chromate, as Cr (see also Sections 1532.2, 5206 & 8359) Stearates; see specific compound | -- | 0.0005\n\nSource: \n", "cas_number": "7789062", "file": "strontium-chromate-as-cr-see-also-sections-1532-2-5206-8359-stearates-see-specif.md", "generated": true, "harvested": "2026-08-05", "id": "strontium-chromate-as-cr-see-also-sections-1532-2-5206-8359-stearates-see-specif", "pel_mgm3": "0.0005", "source_quote": "7789062 | | Strontium chromate, as Cr (see also Sections 1532.2, 5206 & 8359) Stearates; see specific compound | -- | 0.0005", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Strontium chromate, as Cr (see also Sections 1532.2, 5206 & 8359) Stearates; see specific compound", "title": "Strontium chromate, as Cr (see also Sections 1532.2, 5206 & 8359) Stearates; see specific compound \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Strychnine\n\n**CAS No.:** 57249\n\n**PEL (mg/m\u00b3):** 0.15\n\n> 57249 | | Strychnine | -- | 0.15\n\nSource: \n", "cas_number": "57249", "file": "strychnine-2.md", "generated": true, "harvested": "2026-08-05", "id": "strychnine-2", "pel_mgm3": "0.15", "source_quote": "57249 | | Strychnine | -- | 0.15", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Strychnine", "title": "Strychnine \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Strychnine\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Strychnine\n\n**CAS No.:** 57-24-9\n\n> CAS No. 57-24-9\n\n**NIOSH REL (mg/m\u00b3):** TWA 0.15\n\n> NIOSH REL TWA 0.15 mg/m3\n\nSource: \n", "cas_number": "57-24-9", "file": "strychnine-3.md", "generated": true, "harvested": "2026-09-08", "id": "strychnine-3", "quote_cas_number": "CAS No. 57-24-9", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Strychnine", "rel_mgm3": "TWA 0.15", "source_quote": "NIOSH REL TWA 0.15 mg/m3", "sources": ["https://www.cdc.gov/niosh/npg/npgd0570.html"], "stale_after": "2027-09-08", "substance": "Strychnine", "title": "Strychnine \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Strychnine\n\n**CAS No.:** 57-24-9\n\n**PEL (mg/m\u00b3):** 0.15\n\n> Strychnine | 57-24-9 | - | 0.15 | - |\n\nSource: \n", "cas_number": "57-24-9", "file": "strychnine.md", "generated": true, "harvested": "2026-08-05", "id": "strychnine", "pel_mgm3": "0.15", "source_quote": "Strychnine | 57-24-9 | - | 0.15 | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Strychnine", "title": "Strychnine \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Styrene\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Styrene\n\n**CAS No.:** 100-42-5\n\n> CAS No. 100-42-5\n\n**NIOSH REL (ppm):** TWA 50\n\n**NIOSH REL (mg/m\u00b3):** 215\n\n> NIOSH REL TWA 50 ppm (215 mg/m3) ST 100 ppm (425 mg/m3)\n\nSource: \n", "cas_number": "100-42-5", "file": "styrene-2.md", "generated": true, "harvested": "2026-09-08", "id": "styrene-2", "quote_cas_number": "CAS No. 100-42-5", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Styrene", "rel_mgm3": "215", "rel_ppm": "TWA 50", "source_quote": "NIOSH REL TWA 50 ppm (215 mg/m3) ST 100 ppm (425 mg/m3)", "sources": ["https://www.cdc.gov/niosh/npg/npgd0571.html"], "stale_after": "2027-09-08", "substance": "Styrene", "title": "Styrene \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Styrene (monomer); phenylethylene\n\n**CAS No.:** 100425\n\n**PEL (ppm):** 50\n\n**PEL (mg/m\u00b3):** 215\n\n**Ceiling:** 500 ppm\n\n**STEL (ppm):** 100\n\n**STEL (mg/m\u00b3):** 425\n\n> 100425 | S | Styrene (monomer); phenylethylene | 50 | 215 | 500 ppm | 100 | 425\n\nSource: \n", "cas_number": "100425", "ceiling": "500 ppm", "file": "styrene-monomer-phenylethylene.md", "generated": true, "harvested": "2026-08-05", "id": "styrene-monomer-phenylethylene", "pel_mgm3": "215", "pel_ppm": "50", "source_quote": "100425 | S | Styrene (monomer); phenylethylene | 50 | 215 | 500 ppm | 100 | 425", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "stel_mgm3": "425", "stel_ppm": "100", "substance": "Styrene (monomer); phenylethylene", "title": "Styrene (monomer); phenylethylene \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Styrene\n\n**CAS No.:** 100-42-5\n\n> Styrene | 100-42-5 | - | (2) | - |\n\nSource: \n", "cas_number": "100-42-5", "file": "styrene.md", "generated": true, "harvested": "2026-08-05", "id": "styrene", "source_quote": "Styrene | 100-42-5 | - | (2) | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Styrene", "title": "Styrene \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Subtilisins (as pure crystalline proteolytic enzymes)\n\n**CAS No.:** 9014011\n\n**STEL (mg/m\u00b3):** 0.00006(r)\n\n> 9014011 | | Subtilisins (as pure crystalline proteolytic enzymes) | -- | | | | 0.00006(r)\n\nSource: \n", "cas_number": "9014011", "file": "subtilisins-as-pure-crystalline-proteolytic-enzymes.md", "generated": true, "harvested": "2026-08-05", "id": "subtilisins-as-pure-crystalline-proteolytic-enzymes", "source_quote": "9014011 | | Subtilisins (as pure crystalline proteolytic enzymes) | -- | | | | 0.00006(r)", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "stel_mgm3": "0.00006(r)", "substance": "Subtilisins (as pure crystalline proteolytic enzymes)", "title": "Subtilisins (as pure crystalline proteolytic enzymes) \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Subtilisins\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Subtilisins\n\n**CAS No.:** 1395-21-7 (BPN) 9014-01-1 (Carlsburg)\n\n> CAS No. 1395-21-7 (BPN) 9014-01-1 (Carlsburg)\n\n**NIOSH REL (mg/m\u00b3):** ST 0.00006\n\n> NIOSH REL ST 0.00006 mg/m3 [60-minute]\n\nSource: \n", "cas_number": "1395-21-7 (BPN) 9014-01-1 (Carlsburg)", "file": "subtilisins.md", "generated": true, "harvested": "2026-09-08", "id": "subtilisins", "quote_cas_number": "CAS No. 1395-21-7 (BPN) 9014-01-1 (Carlsburg)", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Subtilisins", "rel_mgm3": "ST 0.00006", "source_quote": "NIOSH REL ST 0.00006 mg/m3 [60-minute]", "sources": ["https://www.cdc.gov/niosh/npg/npgd0572.html"], "stale_after": "2027-09-08", "substance": "Subtilisins", "title": "Subtilisins \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Succinonitrile\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Succinonitrile\n\n**CAS No.:** 110-61-2\n\n> CAS No. 110-61-2\n\n**NIOSH REL (ppm):** TWA 6\n\n**NIOSH REL (mg/m\u00b3):** 20\n\n> NIOSH REL TWA 6 ppm (20 mg/m3)\n\nSource: \n", "cas_number": "110-61-2", "file": "succinonitrile.md", "generated": true, "harvested": "2026-09-08", "id": "succinonitrile", "quote_cas_number": "CAS No. 110-61-2", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Succinonitrile", "rel_mgm3": "20", "rel_ppm": "TWA 6", "source_quote": "NIOSH REL TWA 6 ppm (20 mg/m3)", "sources": ["https://www.cdc.gov/niosh/npg/npgd0573.html"], "stale_after": "2027-09-08", "substance": "Succinonitrile", "title": "Succinonitrile \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Sucrose\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Sucrose\n\n**CAS No.:** 57-50-1\n\n> CAS No. 57-50-1\n\n**NIOSH REL, as stated:** TWA 10 mg/m3 (total) TWA 5 mg/m3 (resp)\n\n> NIOSH REL TWA 10 mg/m3 (total) TWA 5 mg/m3 (resp)\n\nSource: \n", "cas_number": "57-50-1", "file": "sucrose-2.md", "generated": true, "harvested": "2026-09-08", "id": "sucrose-2", "quote_cas_number": "CAS No. 57-50-1", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Sucrose", "rel_statement": "TWA 10 mg/m3 (total) TWA 5 mg/m3 (resp)", "source_quote": "NIOSH REL TWA 10 mg/m3 (total) TWA 5 mg/m3 (resp)", "sources": ["https://www.cdc.gov/niosh/npg/npgd0574.html"], "stale_after": "2027-09-08", "substance": "Sucrose", "title": "Sucrose \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Sucrose; see Particulates not otherwise regulated\n\n**CAS No.:** 57501\n\n> 57501 | | Sucrose; see Particulates not otherwise regulated\n\nSource: \n", "cas_number": "57501", "file": "sucrose-see-particulates-not-otherwise-regulated.md", "generated": true, "harvested": "2026-08-05", "id": "sucrose-see-particulates-not-otherwise-regulated", "source_quote": "57501 | | Sucrose; see Particulates not otherwise regulated", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Sucrose; see Particulates not otherwise regulated", "title": "Sucrose; see Particulates not otherwise regulated \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Sucrose\n\n**CAS No.:** 57-50-1\n\n> Sucrose | 57-50-1 | - | - | - |\n\nSource: \n", "cas_number": "57-50-1", "file": "sucrose.md", "generated": true, "harvested": "2026-08-05", "id": "sucrose", "source_quote": "Sucrose | 57-50-1 | - | - | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Sucrose", "title": "Sucrose \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Sulfometuron methyl\n\n**CAS No.:** 74222972\n\n**PEL (mg/m\u00b3):** 3.5\n\n> 74222972 | | Sulfometuron methyl | -- | 3.5\n\nSource: \n", "cas_number": "74222972", "file": "sulfometuron-methyl.md", "generated": true, "harvested": "2026-08-05", "id": "sulfometuron-methyl", "pel_mgm3": "3.5", "source_quote": "74222972 | | Sulfometuron methyl | -- | 3.5", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Sulfometuron methyl", "title": "Sulfometuron methyl \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Sulfotep; tetraethyl dithionopyrophosphate\n\n**CAS No.:** 3689245\n\n**PEL (mg/m\u00b3):** 0.2\n\n> 3689245 | S | Sulfotep; tetraethyl dithionopyrophosphate | | 0.2\n\nSource: \n", "cas_number": "3689245", "file": "sulfotep-tetraethyl-dithionopyrophosphate.md", "generated": true, "harvested": "2026-08-05", "id": "sulfotep-tetraethyl-dithionopyrophosphate", "pel_mgm3": "0.2", "source_quote": "3689245 | S | Sulfotep; tetraethyl dithionopyrophosphate | | 0.2", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Sulfotep; tetraethyl dithionopyrophosphate", "title": "Sulfotep; tetraethyl dithionopyrophosphate \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Sulfur dioxide\n\n**CAS No.:** 7446095\n\n**PEL (ppm):** 2\n\n**PEL (mg/m\u00b3):** 5\n\n**STEL (ppm):** 5\n\n**STEL (mg/m\u00b3):** 10\n\n> 7446095 | | Sulfur dioxide | 2 | 5 | | 5 | 10\n\nSource: \n", "cas_number": "7446095", "file": "sulfur-dioxide-2.md", "generated": true, "harvested": "2026-08-05", "id": "sulfur-dioxide-2", "pel_mgm3": "5", "pel_ppm": "2", "source_quote": "7446095 | | Sulfur dioxide | 2 | 5 | | 5 | 10", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "stel_mgm3": "10", "stel_ppm": "5", "substance": "Sulfur dioxide", "title": "Sulfur dioxide \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Sulfur dioxide\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Sulfur dioxide\n\n**CAS No.:** 7446-09-5\n\n> CAS No. 7446-09-5\n\n**NIOSH REL (ppm):** TWA 2\n\n**NIOSH REL (mg/m\u00b3):** 5\n\n> NIOSH REL TWA 2 ppm (5 mg/m3) ST 5 ppm (13 mg/m3)\n\nSource: \n", "cas_number": "7446-09-5", "file": "sulfur-dioxide-3.md", "generated": true, "harvested": "2026-09-08", "id": "sulfur-dioxide-3", "quote_cas_number": "CAS No. 7446-09-5", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Sulfur dioxide", "rel_mgm3": "5", "rel_ppm": "TWA 2", "source_quote": "NIOSH REL TWA 2 ppm (5 mg/m3) ST 5 ppm (13 mg/m3)", "sources": ["https://www.cdc.gov/niosh/npg/npgd0575.html"], "stale_after": "2027-09-08", "substance": "Sulfur dioxide", "title": "Sulfur dioxide \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Sulfur dioxide\n\n**CAS No.:** 7446-09-5\n\n**PEL (ppm):** 5\n\n**PEL (mg/m\u00b3):** 13\n\n> Sulfur dioxide | 7446-09-5 | 5 | 13 | - |\n\nSource: \n", "cas_number": "7446-09-5", "file": "sulfur-dioxide.md", "generated": true, "harvested": "2026-08-05", "id": "sulfur-dioxide", "pel_mgm3": "13", "pel_ppm": "5", "source_quote": "Sulfur dioxide | 7446-09-5 | 5 | 13 | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Sulfur dioxide", "title": "Sulfur dioxide \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Sulfur hexafluoride\n\n**CAS No.:** 2551624\n\n**PEL (ppm):** 1,000\n\n**PEL (mg/m\u00b3):** 6,000\n\n> 2551624 | | Sulfur hexafluoride | 1,000 | 6,000\n\nSource: \n", "cas_number": "2551624", "file": "sulfur-hexafluoride-2.md", "generated": true, "harvested": "2026-08-05", "id": "sulfur-hexafluoride-2", "pel_mgm3": "6,000", "pel_ppm": "1,000", "source_quote": "2551624 | | Sulfur hexafluoride | 1,000 | 6,000", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Sulfur hexafluoride", "title": "Sulfur hexafluoride \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Sulfur hexafluoride\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Sulfur hexafluoride\n\n**CAS No.:** 2551-62-4\n\n> CAS No. 2551-62-4\n\n**NIOSH REL (ppm):** TWA 1000\n\n**NIOSH REL (mg/m\u00b3):** 6000\n\n> NIOSH REL TWA 1000 ppm (6000 mg/m3)\n\nSource: \n", "cas_number": "2551-62-4", "file": "sulfur-hexafluoride-3.md", "generated": true, "harvested": "2026-09-08", "id": "sulfur-hexafluoride-3", "quote_cas_number": "CAS No. 2551-62-4", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Sulfur hexafluoride", "rel_mgm3": "6000", "rel_ppm": "TWA 1000", "source_quote": "NIOSH REL TWA 1000 ppm (6000 mg/m3)", "sources": ["https://www.cdc.gov/niosh/npg/npgd0576.html"], "stale_after": "2027-09-08", "substance": "Sulfur hexafluoride", "title": "Sulfur hexafluoride \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Sulfur hexafluoride\n\n**CAS No.:** 2551-62-4\n\n**PEL (ppm):** 1000\n\n**PEL (mg/m\u00b3):** 6000\n\n> Sulfur hexafluoride | 2551-62-4 | 1000 | 6000 | - |\n\nSource: \n", "cas_number": "2551-62-4", "file": "sulfur-hexafluoride.md", "generated": true, "harvested": "2026-08-05", "id": "sulfur-hexafluoride", "pel_mgm3": "6000", "pel_ppm": "1000", "source_quote": "Sulfur hexafluoride | 2551-62-4 | 1000 | 6000 | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Sulfur hexafluoride", "title": "Sulfur hexafluoride \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Sulfur monochloride\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Sulfur monochloride\n\n**CAS No.:** 10025-67-9\n\n> CAS No. 10025-67-9\n\n**NIOSH REL (ppm):** C 1\n\n**NIOSH REL (mg/m\u00b3):** 6\n\n> NIOSH REL C 1 ppm (6 mg/m3)\n\nSource: \n", "cas_number": "10025-67-9", "file": "sulfur-monochloride-2.md", "generated": true, "harvested": "2026-09-08", "id": "sulfur-monochloride-2", "quote_cas_number": "CAS No. 10025-67-9", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Sulfur monochloride", "rel_mgm3": "6", "rel_ppm": "C 1", "source_quote": "NIOSH REL C 1 ppm (6 mg/m3)", "sources": ["https://www.cdc.gov/niosh/npg/npgd0578.html"], "stale_after": "2027-09-08", "substance": "Sulfur monochloride", "title": "Sulfur monochloride \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Sulfur monochloride; S$2Cl$2\n\n**CAS No.:** 10025679\n\n**PEL (ppm):** 1\n\n**PEL (mg/m\u00b3):** 6\n\n**Ceiling:** C\n\n> 10025679 | | Sulfur monochloride; S$2Cl$2 | 1 | 6 | C\n\nSource: \n", "cas_number": "10025679", "ceiling": "C", "file": "sulfur-monochloride-s-2-cl-2.md", "generated": true, "harvested": "2026-08-05", "id": "sulfur-monochloride-s-2-cl-2", "pel_mgm3": "6", "pel_ppm": "1", "source_quote": "10025679 | | Sulfur monochloride; S$2Cl$2 | 1 | 6 | C", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Sulfur monochloride; S$2Cl$2", "title": "Sulfur monochloride; S $2 Cl $2 \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Sulfur monochloride\n\n**CAS No.:** 10025-67-9\n\n**PEL (ppm):** 1\n\n**PEL (mg/m\u00b3):** 6\n\n> Sulfur monochloride | 10025-67-9 | 1 | 6 | - |\n\nSource: \n", "cas_number": "10025-67-9", "file": "sulfur-monochloride.md", "generated": true, "harvested": "2026-08-05", "id": "sulfur-monochloride", "pel_mgm3": "6", "pel_ppm": "1", "source_quote": "Sulfur monochloride | 10025-67-9 | 1 | 6 | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Sulfur monochloride", "title": "Sulfur monochloride \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Sulfur pentafluoride\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Sulfur pentafluoride\n\n**CAS No.:** 5714-22-7\n\n> CAS No. 5714-22-7\n\n**NIOSH REL (ppm):** C 0.01\n\n**NIOSH REL (mg/m\u00b3):** 0.1\n\n> NIOSH REL C 0.01 ppm (0.1 mg/m3)\n\nSource: \n", "cas_number": "5714-22-7", "file": "sulfur-pentafluoride-2.md", "generated": true, "harvested": "2026-09-08", "id": "sulfur-pentafluoride-2", "quote_cas_number": "CAS No. 5714-22-7", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Sulfur pentafluoride", "rel_mgm3": "0.1", "rel_ppm": "C 0.01", "source_quote": "NIOSH REL C 0.01 ppm (0.1 mg/m3)", "sources": ["https://www.cdc.gov/niosh/npg/npgd0579.html"], "stale_after": "2027-09-08", "substance": "Sulfur pentafluoride", "title": "Sulfur pentafluoride \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Sulfur pentafluoride; S$2F$10\n\n**CAS No.:** 5714227\n\n**PEL (ppm):** 0.01\n\n**PEL (mg/m\u00b3):** 0.1\n\n**Ceiling:** C\n\n> 5714227 | | Sulfur pentafluoride; S$2F$10 | 0.01 | 0.1 | C\n\nSource: \n", "cas_number": "5714227", "ceiling": "C", "file": "sulfur-pentafluoride-s-2-f-10.md", "generated": true, "harvested": "2026-08-05", "id": "sulfur-pentafluoride-s-2-f-10", "pel_mgm3": "0.1", "pel_ppm": "0.01", "source_quote": "5714227 | | Sulfur pentafluoride; S$2F$10 | 0.01 | 0.1 | C", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Sulfur pentafluoride; S$2F$10", "title": "Sulfur pentafluoride; S $2 F $10 \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Sulfur pentafluoride\n\n**CAS No.:** 5714-22-7\n\n**PEL (ppm):** 0.025\n\n**PEL (mg/m\u00b3):** 0.25\n\n> Sulfur pentafluoride | 5714-22-7 | 0.025 | 0.25 | - |\n\nSource: \n", "cas_number": "5714-22-7", "file": "sulfur-pentafluoride.md", "generated": true, "harvested": "2026-08-05", "id": "sulfur-pentafluoride", "pel_mgm3": "0.25", "pel_ppm": "0.025", "source_quote": "Sulfur pentafluoride | 5714-22-7 | 0.025 | 0.25 | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Sulfur pentafluoride", "title": "Sulfur pentafluoride \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Sulfur tetrafluoride\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Sulfur tetrafluoride\n\n**CAS No.:** 7783-60-0\n\n> CAS No. 7783-60-0\n\n**NIOSH REL (ppm):** C 0.1\n\n**NIOSH REL (mg/m\u00b3):** 0.4\n\n> NIOSH REL C 0.1 ppm (0.4 mg/m3)\n\nSource: \n", "cas_number": "7783-60-0", "file": "sulfur-tetrafluoride-2.md", "generated": true, "harvested": "2026-09-08", "id": "sulfur-tetrafluoride-2", "quote_cas_number": "CAS No. 7783-60-0", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Sulfur tetrafluoride", "rel_mgm3": "0.4", "rel_ppm": "C 0.1", "source_quote": "NIOSH REL C 0.1 ppm (0.4 mg/m3)", "sources": ["https://www.cdc.gov/niosh/npg/npgd0580.html"], "stale_after": "2027-09-08", "substance": "Sulfur tetrafluoride", "title": "Sulfur tetrafluoride \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Sulfur tetrafluoride\n\n**CAS No.:** 7783600\n\n**PEL (ppm):** 0.1\n\n**PEL (mg/m\u00b3):** 0.4\n\n**Ceiling:** C\n\n> 7783600 | | Sulfur tetrafluoride | 0.1 | 0.4 | C\n\nSource: \n", "cas_number": "7783600", "ceiling": "C", "file": "sulfur-tetrafluoride.md", "generated": true, "harvested": "2026-08-05", "id": "sulfur-tetrafluoride", "pel_mgm3": "0.4", "pel_ppm": "0.1", "source_quote": "7783600 | | Sulfur tetrafluoride | 0.1 | 0.4 | C", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Sulfur tetrafluoride", "title": "Sulfur tetrafluoride \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Sulfuric acid\n\n**CAS No.:** 7664939\n\n**PEL (mg/m\u00b3):** 0.1\n\n**STEL (mg/m\u00b3):** 3\n\n> 7664939 | | Sulfuric acid | -- | 0.1 | | -- | 3\n\nSource: \n", "cas_number": "7664939", "file": "sulfuric-acid-2.md", "generated": true, "harvested": "2026-08-05", "id": "sulfuric-acid-2", "pel_mgm3": "0.1", "source_quote": "7664939 | | Sulfuric acid | -- | 0.1 | | -- | 3", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "stel_mgm3": "3", "substance": "Sulfuric acid", "title": "Sulfuric acid \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Sulfuric acid\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Sulfuric acid\n\n**CAS No.:** 7664-93-9\n\n> CAS No. 7664-93-9\n\n**NIOSH REL (mg/m\u00b3):** TWA 1\n\n> NIOSH REL TWA 1 mg/m3\n\nSource: \n", "cas_number": "7664-93-9", "file": "sulfuric-acid-3.md", "generated": true, "harvested": "2026-09-08", "id": "sulfuric-acid-3", "quote_cas_number": "CAS No. 7664-93-9", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Sulfuric acid", "rel_mgm3": "TWA 1", "source_quote": "NIOSH REL TWA 1 mg/m3", "sources": ["https://www.cdc.gov/niosh/npg/npgd0577.html"], "stale_after": "2027-09-08", "substance": "Sulfuric acid", "title": "Sulfuric acid \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Sulfuric acid\n\n**CAS No.:** 7664-93-9\n\n**PEL (mg/m\u00b3):** 1\n\n> Sulfuric acid | 7664-93-9 | - | 1 | - |\n\nSource: \n", "cas_number": "7664-93-9", "file": "sulfuric-acid.md", "generated": true, "harvested": "2026-08-05", "id": "sulfuric-acid", "pel_mgm3": "1", "source_quote": "Sulfuric acid | 7664-93-9 | - | 1 | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Sulfuric acid", "title": "Sulfuric acid \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Sulfuryl fluoride\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Sulfuryl fluoride\n\n**CAS No.:** 2699-79-8\n\n> CAS No. 2699-79-8\n\n**NIOSH REL (ppm):** TWA 5\n\n**NIOSH REL (mg/m\u00b3):** 20\n\n> NIOSH REL TWA 5 ppm (20 mg/m3) ST 10 ppm (40 mg/m3)\n\nSource: \n", "cas_number": "2699-79-8", "file": "sulfuryl-fluoride-2.md", "generated": true, "harvested": "2026-09-08", "id": "sulfuryl-fluoride-2", "quote_cas_number": "CAS No. 2699-79-8", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Sulfuryl fluoride", "rel_mgm3": "20", "rel_ppm": "TWA 5", "source_quote": "NIOSH REL TWA 5 ppm (20 mg/m3) ST 10 ppm (40 mg/m3)", "sources": ["https://www.cdc.gov/niosh/npg/npgd0581.html"], "stale_after": "2027-09-08", "substance": "Sulfuryl fluoride", "title": "Sulfuryl fluoride \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Sulfuryl fluoride; SO$2F$2\n\n**CAS No.:** 2699798\n\n**PEL (ppm):** 5\n\n**PEL (mg/m\u00b3):** 20\n\n**STEL (ppm):** 10\n\n**STEL (mg/m\u00b3):** 40\n\n> 2699798 | | Sulfuryl fluoride; SO$2F$2 | 5 | 20 | | 10 | 40\n\nSource: \n", "cas_number": "2699798", "file": "sulfuryl-fluoride-so-2-f-2.md", "generated": true, "harvested": "2026-08-05", "id": "sulfuryl-fluoride-so-2-f-2", "pel_mgm3": "20", "pel_ppm": "5", "source_quote": "2699798 | | Sulfuryl fluoride; SO$2F$2 | 5 | 20 | | 10 | 40", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "stel_mgm3": "40", "stel_ppm": "10", "substance": "Sulfuryl fluoride; SO$2F$2", "title": "Sulfuryl fluoride; SO $2 F $2 \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Sulfuryl fluoride\n\n**CAS No.:** 2699-79-8\n\n**PEL (ppm):** 5\n\n**PEL (mg/m\u00b3):** 20\n\n> Sulfuryl fluoride | 2699-79-8 | 5 | 20 | - |\n\nSource: \n", "cas_number": "2699-79-8", "file": "sulfuryl-fluoride.md", "generated": true, "harvested": "2026-08-05", "id": "sulfuryl-fluoride", "pel_mgm3": "20", "pel_ppm": "5", "source_quote": "Sulfuryl fluoride | 2699-79-8 | 5 | 20 | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Sulfuryl fluoride", "title": "Sulfuryl fluoride \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Sulprofos\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Sulprofos\n\n**CAS No.:** 35400-43-2\n\n> CAS No. 35400-43-2\n\n**NIOSH REL (mg/m\u00b3):** TWA 1\n\n> NIOSH REL TWA 1 mg/m3\n\nSource: \n", "cas_number": "35400-43-2", "file": "sulprofos-2.md", "generated": true, "harvested": "2026-09-08", "id": "sulprofos-2", "quote_cas_number": "CAS No. 35400-43-2", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Sulprofos", "rel_mgm3": "TWA 1", "source_quote": "NIOSH REL TWA 1 mg/m3", "sources": ["https://www.cdc.gov/niosh/npg/npgd0582.html"], "stale_after": "2027-09-08", "substance": "Sulprofos", "title": "Sulprofos \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Sulprofos\n\n**CAS No.:** 35400432\n\n**PEL (mg/m\u00b3):** 1\n\n> 35400432 | | Sulprofos | | 1\n\nSource: \n", "cas_number": "35400432", "file": "sulprofos.md", "generated": true, "harvested": "2026-08-05", "id": "sulprofos", "pel_mgm3": "1", "source_quote": "35400432 | | Sulprofos | | 1", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Sulprofos", "title": "Sulprofos \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Talc (containing no asbestos and less than 1% quartz)\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Talc (containing no asbestos and less than 1% quartz)\n\n**CAS No.:** 14807-96-6\n\n> CAS No. 14807-96-6\n\n**NIOSH REL, as stated:** TWA 2 mg/m3 (resp)\n\n> NIOSH REL TWA 2 mg/m3 (resp)\n\nSource: \n", "cas_number": "14807-96-6", "file": "talc-containing-no-asbestos-and-less-than-1-quartz.md", "generated": true, "harvested": "2026-09-08", "id": "talc-containing-no-asbestos-and-less-than-1-quartz", "quote_cas_number": "CAS No. 14807-96-6", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Talc (containing no asbestos and less than 1% quartz)", "rel_statement": "TWA 2 mg/m3 (resp)", "source_quote": "NIOSH REL TWA 2 mg/m3 (resp)", "sources": ["https://www.cdc.gov/niosh/npg/npgd0584.html"], "stale_after": "2027-09-08", "substance": "Talc (containing no asbestos and less than 1% quartz)", "title": "Talc (containing no asbestos and less than 1% quartz) \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Talc (containing no asbestos fibers), respirable dust\n\n**CAS No.:** 14807966\n\n**PEL (mg/m\u00b3):** 2\n\n> 14807966 | | Talc (containing no asbestos fibers), respirable dust | -- | 2\n\nSource: \n", "cas_number": "14807966", "file": "talc-containing-no-asbestos-fibers-respirable-dust.md", "generated": true, "harvested": "2026-08-05", "id": "talc-containing-no-asbestos-fibers-respirable-dust", "pel_mgm3": "2", "source_quote": "14807966 | | Talc (containing no asbestos fibers), respirable dust | -- | 2", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Talc (containing no asbestos fibers), respirable dust", "title": "Talc (containing no asbestos fibers), respirable dust \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Talc (containing no asbestos), respirable dust\n\n**CAS No.:** 14807-96-6\n\n> Talc (containing no asbestos), respirable dust | 14807-96-6 | - | (3) | - |\n\nSource: \n", "cas_number": "14807-96-6", "file": "talc-containing-no-asbestos-respirable-dust.md", "generated": true, "harvested": "2026-08-05", "id": "talc-containing-no-asbestos-respirable-dust", "source_quote": "Talc (containing no asbestos), respirable dust | 14807-96-6 | - | (3) | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Talc (containing no asbestos), respirable dust", "title": "Talc (containing no asbestos), respirable dust \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Tantalum (metal and oxide dust, as Ta)\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Tantalum (metal and oxide dust, as Ta)\n\n**CAS No.:** 7440-25-7 (metal)\n\n> CAS No. 7440-25-7 (metal)\n\n**NIOSH REL (mg/m\u00b3):** TWA 5\n\n> NIOSH REL TWA 5 mg/m3 ST 10 mg/m3\n\nSource: \n", "cas_number": "7440-25-7 (metal)", "file": "tantalum-metal-and-oxide-dust-as-ta.md", "generated": true, "harvested": "2026-09-08", "id": "tantalum-metal-and-oxide-dust-as-ta", "quote_cas_number": "CAS No. 7440-25-7 (metal)", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Tantalum (metal and oxide dust, as Ta)", "rel_mgm3": "TWA 5", "source_quote": "NIOSH REL TWA 5 mg/m3 ST 10 mg/m3", "sources": ["https://www.cdc.gov/niosh/npg/npgd0585.html"], "stale_after": "2027-09-08", "substance": "Tantalum (metal and oxide dust, as Ta)", "title": "Tantalum (metal and oxide dust, as Ta) \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Tantalum, metal and oxide dust\n\n**CAS No.:** 7440-25-7\n\n**PEL (mg/m\u00b3):** 5\n\n> Tantalum, metal and oxide dust | 7440-25-7 | - | 5 | - |\n\nSource: \n", "cas_number": "7440-25-7", "file": "tantalum-metal-and-oxide-dust.md", "generated": true, "harvested": "2026-08-05", "id": "tantalum-metal-and-oxide-dust", "pel_mgm3": "5", "source_quote": "Tantalum, metal and oxide dust | 7440-25-7 | - | 5 | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Tantalum, metal and oxide dust", "title": "Tantalum, metal and oxide dust \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Tantalum metal dust, as Ta\n\n**CAS No.:** 7440257\n\n**PEL (mg/m\u00b3):** 5\n\n> 7440257 | | Tantalum metal dust, as Ta | -- | 5\n\nSource: \n", "cas_number": "7440257", "file": "tantalum-metal-dust-as-ta.md", "generated": true, "harvested": "2026-08-05", "id": "tantalum-metal-dust-as-ta", "pel_mgm3": "5", "source_quote": "7440257 | | Tantalum metal dust, as Ta | -- | 5", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Tantalum metal dust, as Ta", "title": "Tantalum metal dust, as Ta \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Tantalum oxide dust, as Ta\n\n**CAS No.:** 1314610\n\n**PEL (mg/m\u00b3):** 5\n\n> 1314610 | | Tantalum oxide dust, as Ta | -- | 5\n\nSource: \n", "cas_number": "1314610", "file": "tantalum-oxide-dust-as-ta.md", "generated": true, "harvested": "2026-08-05", "id": "tantalum-oxide-dust-as-ta", "pel_mgm3": "5", "source_quote": "1314610 | | Tantalum oxide dust, as Ta | -- | 5", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Tantalum oxide dust, as Ta", "title": "Tantalum oxide dust, as Ta \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** TCP; see Triorthocresyl phosphate\n\n**CAS No.:** 78308\n\n> 78308 | | TCP; see Triorthocresyl phosphate\n\nSource: \n", "cas_number": "78308", "file": "tcp-see-triorthocresyl-phosphate.md", "generated": true, "harvested": "2026-08-05", "id": "tcp-see-triorthocresyl-phosphate", "source_quote": "78308 | | TCP; see Triorthocresyl phosphate", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "TCP; see Triorthocresyl phosphate", "title": "TCP; see Triorthocresyl phosphate \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** TDI; see Toluene-2,4-diisocyanate\n\n**CAS No.:** 584849\n\n> 584849 | | TDI; see Toluene-2,4-diisocyanate\n\nSource: \n", "cas_number": "584849", "file": "tdi-see-toluene-2-4-diisocyanate.md", "generated": true, "harvested": "2026-08-05", "id": "tdi-see-toluene-2-4-diisocyanate", "source_quote": "584849 | | TDI; see Toluene-2,4-diisocyanate", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "TDI; see Toluene-2,4-diisocyanate", "title": "TDI; see Toluene-2,4-diisocyanate \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** TEDP; see Sulfotep\n\n**CAS No.:** 3689245\n\n> 3689245 | S | TEDP; see Sulfotep\n\nSource: \n", "cas_number": "3689245", "file": "tedp-see-sulfotep.md", "generated": true, "harvested": "2026-08-05", "id": "tedp-see-sulfotep", "source_quote": "3689245 | S | TEDP; see Sulfotep", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "TEDP; see Sulfotep", "title": "TEDP; see Sulfotep \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** TEDP (Sulfotep)\n\n**CAS No.:** 3689-24-5\n\n**PEL (mg/m\u00b3):** 0.2\n\n> TEDP (Sulfotep) | 3689-24-5 | - | 0.2 | X |\n\nSource: \n", "cas_number": "3689-24-5", "file": "tedp-sulfotep.md", "generated": true, "harvested": "2026-08-05", "id": "tedp-sulfotep", "pel_mgm3": "0.2", "source_quote": "TEDP (Sulfotep) | 3689-24-5 | - | 0.2 | X |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "TEDP (Sulfotep)", "title": "TEDP (Sulfotep) \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** TEDP\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - TEDP\n\n**CAS No.:** 3689-24-5\n\n> CAS No. 3689-24-5\n\n**NIOSH REL (mg/m\u00b3):** TWA 0.2\n\n> NIOSH REL TWA 0.2 mg/m3 [skin]\n\nSource: \n", "cas_number": "3689-24-5", "file": "tedp.md", "generated": true, "harvested": "2026-09-08", "id": "tedp", "quote_cas_number": "CAS No. 3689-24-5", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - TEDP", "rel_mgm3": "TWA 0.2", "source_quote": "NIOSH REL TWA 0.2 mg/m3 [skin]", "sources": ["https://www.cdc.gov/niosh/npg/npgd0586.html"], "stale_after": "2027-09-08", "substance": "TEDP", "title": "TEDP \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Tellurium and compounds (as Te)\n\n**CAS No.:** 13494-80-9\n\n**PEL (mg/m\u00b3):** 0.1\n\n> Tellurium and compounds (as Te) | 13494-80-9 | - | 0.1 | - |\n\nSource: \n", "cas_number": "13494-80-9", "file": "tellurium-and-compounds-as-te.md", "generated": true, "harvested": "2026-08-05", "id": "tellurium-and-compounds-as-te", "pel_mgm3": "0.1", "source_quote": "Tellurium and compounds (as Te) | 13494-80-9 | - | 0.1 | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Tellurium and compounds (as Te)", "title": "Tellurium and compounds (as Te) \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Tellurium hexafluoride\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Tellurium hexafluoride\n\n**CAS No.:** 7783-80-4\n\n> CAS No. 7783-80-4\n\n**NIOSH REL (ppm):** TWA 0.02\n\n**NIOSH REL (mg/m\u00b3):** 0.2\n\n> NIOSH REL TWA 0.02 ppm (0.2 mg/m3)\n\nSource: \n", "cas_number": "7783-80-4", "file": "tellurium-hexafluoride-2.md", "generated": true, "harvested": "2026-09-08", "id": "tellurium-hexafluoride-2", "quote_cas_number": "CAS No. 7783-80-4", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Tellurium hexafluoride", "rel_mgm3": "0.2", "rel_ppm": "TWA 0.02", "source_quote": "NIOSH REL TWA 0.02 ppm (0.2 mg/m3)", "sources": ["https://www.cdc.gov/niosh/npg/npgd0588.html"], "stale_after": "2027-09-08", "substance": "Tellurium hexafluoride", "title": "Tellurium hexafluoride \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Tellurium hexafluoride (as Te)\n\n**CAS No.:** 7783-80-4\n\n**PEL (ppm):** 0.02\n\n**PEL (mg/m\u00b3):** 0.2\n\n> Tellurium hexafluoride (as Te) | 7783-80-4 | 0.02 | 0.2 | - |\n\nSource: \n", "cas_number": "7783-80-4", "file": "tellurium-hexafluoride-as-te.md", "generated": true, "harvested": "2026-08-05", "id": "tellurium-hexafluoride-as-te", "pel_mgm3": "0.2", "pel_ppm": "0.02", "source_quote": "Tellurium hexafluoride (as Te) | 7783-80-4 | 0.02 | 0.2 | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Tellurium hexafluoride (as Te)", "title": "Tellurium hexafluoride (as Te) \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Tellurium hexafluoride\n\n**CAS No.:** 7783804\n\n**PEL (ppm):** 0.02\n\n**PEL (mg/m\u00b3):** 0.2\n\n> 7783804 | | Tellurium hexafluoride | 0.02 | 0.2\n\nSource: \n", "cas_number": "7783804", "file": "tellurium-hexafluoride.md", "generated": true, "harvested": "2026-08-05", "id": "tellurium-hexafluoride", "pel_mgm3": "0.2", "pel_ppm": "0.02", "source_quote": "7783804 | | Tellurium hexafluoride | 0.02 | 0.2", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Tellurium hexafluoride", "title": "Tellurium hexafluoride \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Tellurium\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Tellurium\n\n**CAS No.:** 13494-80-9\n\n> CAS No. 13494-80-9\n\n**NIOSH REL (mg/m\u00b3):** TWA 0.1\n\n> NIOSH REL TWA 0.1 mg/m3\n\nSource: \n", "cas_number": "13494-80-9", "file": "tellurium.md", "generated": true, "harvested": "2026-09-08", "id": "tellurium", "quote_cas_number": "CAS No. 13494-80-9", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Tellurium", "rel_mgm3": "TWA 0.1", "source_quote": "NIOSH REL TWA 0.1 mg/m3", "sources": ["https://www.cdc.gov/niosh/npg/npgd0587.html"], "stale_after": "2027-09-08", "substance": "Tellurium", "title": "Tellurium \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Temephos\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Temephos\n\n**CAS No.:** 3383-96-8\n\n> CAS No. 3383-96-8\n\n**NIOSH REL, as stated:** TWA 10 mg/m3 (total) TWA 5 mg/m3 (resp)\n\n> NIOSH REL TWA 10 mg/m3 (total) TWA 5 mg/m3 (resp)\n\nSource: \n", "cas_number": "3383-96-8", "file": "temephos-2.md", "generated": true, "harvested": "2026-09-08", "id": "temephos-2", "quote_cas_number": "CAS No. 3383-96-8", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Temephos", "rel_statement": "TWA 10 mg/m3 (total) TWA 5 mg/m3 (resp)", "source_quote": "NIOSH REL TWA 10 mg/m3 (total) TWA 5 mg/m3 (resp)", "sources": ["https://www.cdc.gov/niosh/npg/npgd0589.html"], "stale_after": "2027-09-08", "substance": "Temephos", "title": "Temephos \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Temephos; o,o,o\u2032 ,o\u2032-tetramethyl o,o\u2032-thiodi-p-phenylene phosphorothioate Total dust\n\n**CAS No.:** 3383968\n\n**PEL (mg/m\u00b3):** 10\n\n> 3383968 | | Temephos; o,o,o\u2032 ,o\u2032-tetramethyl o,o\u2032-thiodi-p-phenylene phosphorothioate Total dust | -- | 10\n\nSource: \n", "cas_number": "3383968", "file": "temephos-o-o-o-o-tetramethyl-o-o-thiodi-p-phenylene-phosphorothioate-total-dust.md", "generated": true, "harvested": "2026-08-05", "id": "temephos-o-o-o-o-tetramethyl-o-o-thiodi-p-phenylene-phosphorothioate-total-dust", "pel_mgm3": "10", "source_quote": "3383968 | | Temephos; o,o,o\u2032 ,o\u2032-tetramethyl o,o\u2032-thiodi-p-phenylene phosphorothioate Total dust | -- | 10", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Temephos; o,o,o\u2032 ,o\u2032-tetramethyl o,o\u2032-thiodi-p-phenylene phosphorothioate Total dust", "title": "Temephos; o,o,o\u2032 ,o\u2032-tetramethyl o,o\u2032-thiodi-p-phenylene phosphorothioate Total dust \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Temephos\n\n**CAS No.:** 3383-96-8\n\n> Temephos | 3383-96-8 | - | - | - |\n\nSource: \n", "cas_number": "3383-96-8", "file": "temephos.md", "generated": true, "harvested": "2026-08-05", "id": "temephos", "source_quote": "Temephos | 3383-96-8 | - | - | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Temephos", "title": "Temephos \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** TEPP; tetraethyl pyrophosphate;\n\n**CAS No.:** 107493\n\n**PEL (ppm):** 0.004\n\n**PEL (mg/m\u00b3):** 0.05\n\n> 107493 | S | TEPP; tetraethyl pyrophosphate; | 0.004 | 0.05\n\nSource: \n", "cas_number": "107493", "file": "tepp-tetraethyl-pyrophosphate-2.md", "generated": true, "harvested": "2026-08-05", "id": "tepp-tetraethyl-pyrophosphate-2", "pel_mgm3": "0.05", "pel_ppm": "0.004", "source_quote": "107493 | S | TEPP; tetraethyl pyrophosphate; | 0.004 | 0.05", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "TEPP; tetraethyl pyrophosphate;", "title": "TEPP; tetraethyl pyrophosphate; \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** TEPP (Tetraethyl pyrophosphate)\n\n**CAS No.:** 107-49-3\n\n**PEL (mg/m\u00b3):** 0.05\n\n> TEPP (Tetraethyl pyrophosphate) | 107-49-3 | - | 0.05 | X |\n\nSource: \n", "cas_number": "107-49-3", "file": "tepp-tetraethyl-pyrophosphate.md", "generated": true, "harvested": "2026-08-05", "id": "tepp-tetraethyl-pyrophosphate", "pel_mgm3": "0.05", "source_quote": "TEPP (Tetraethyl pyrophosphate) | 107-49-3 | - | 0.05 | X |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "TEPP (Tetraethyl pyrophosphate)", "title": "TEPP (Tetraethyl pyrophosphate) \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** TEPP\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - TEPP\n\n**CAS No.:** 107-49-3\n\n> CAS No. 107-49-3\n\n**NIOSH REL (mg/m\u00b3):** TWA 0.05\n\n> NIOSH REL TWA 0.05 mg/m3 [skin]\n\nSource: \n", "cas_number": "107-49-3", "file": "tepp.md", "generated": true, "harvested": "2026-09-08", "id": "tepp", "quote_cas_number": "CAS No. 107-49-3", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - TEPP", "rel_mgm3": "TWA 0.05", "source_quote": "NIOSH REL TWA 0.05 mg/m3 [skin]", "sources": ["https://www.cdc.gov/niosh/npg/npgd0590.html"], "stale_after": "2027-09-08", "substance": "TEPP", "title": "TEPP \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Terephthalic acid\n\n**CAS No.:** 100210\n\n**PEL (mg/m\u00b3):** 10\n\n> 100210 | | Terephthalic acid | -- | 10\n\nSource: \n", "cas_number": "100210", "file": "terephthalic-acid.md", "generated": true, "harvested": "2026-08-05", "id": "terephthalic-acid", "pel_mgm3": "10", "source_quote": "100210 | | Terephthalic acid | -- | 10", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Terephthalic acid", "title": "Terephthalic acid \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Terphenyls\n\n**CAS No.:** 26140-60-3\n\n**PEL (ppm):** (C)1\n\n**PEL (mg/m\u00b3):** (C)9\n\n> Terphenyls | 26140-60-3 | (C)1 | (C)9 | - |\n\nSource: \n", "cas_number": "26140-60-3", "file": "terphenyls.md", "generated": true, "harvested": "2026-08-05", "id": "terphenyls", "pel_mgm3": "(C)9", "pel_ppm": "(C)1", "source_quote": "Terphenyls | 26140-60-3 | (C)1 | (C)9 | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Terphenyls", "title": "Terphenyls \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** tert-Amyl acetate; see Pentyl acetate\n\n**CAS No.:** 625161\n\n> 625161 | | tert-Amyl acetate; see Pentyl acetate\n\nSource: \n", "cas_number": "625161", "file": "tert-amyl-acetate-see-pentyl-acetate.md", "generated": true, "harvested": "2026-08-05", "id": "tert-amyl-acetate-see-pentyl-acetate", "source_quote": "625161 | | tert-Amyl acetate; see Pentyl acetate", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "tert-Amyl acetate; see Pentyl acetate", "title": "tert-Amyl acetate; see Pentyl acetate \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** tert-Butyl acetate\n\n**CAS No.:** 540885\n\n**PEL (ppm):** 200\n\n**PEL (mg/m\u00b3):** 955\n\n> 540885 | | tert-Butyl acetate | 200 | 955\n\nSource: \n", "cas_number": "540885", "file": "tert-butyl-acetate-2.md", "generated": true, "harvested": "2026-08-05", "id": "tert-butyl-acetate-2", "pel_mgm3": "955", "pel_ppm": "200", "source_quote": "540885 | | tert-Butyl acetate | 200 | 955", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "tert-Butyl acetate", "title": "tert-Butyl acetate \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** tert-Butyl acetate\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - tert-Butyl acetate\n\n**CAS No.:** 540-88-5\n\n> CAS No. 540-88-5\n\n**NIOSH REL (ppm):** TWA 200\n\n**NIOSH REL (mg/m\u00b3):** 950\n\n> NIOSH REL TWA 200 ppm (950 mg/m3)\n\nSource: \n", "cas_number": "540-88-5", "file": "tert-butyl-acetate-3.md", "generated": true, "harvested": "2026-09-08", "id": "tert-butyl-acetate-3", "quote_cas_number": "CAS No. 540-88-5", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - tert-Butyl acetate", "rel_mgm3": "950", "rel_ppm": "TWA 200", "source_quote": "NIOSH REL TWA 200 ppm (950 mg/m3)", "sources": ["https://www.cdc.gov/niosh/npg/npgd0074.html"], "stale_after": "2027-09-08", "substance": "tert-Butyl acetate", "title": "tert-Butyl acetate \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** tert-Butyl acetate\n\n**CAS No.:** 540-88-5\n\n**PEL (ppm):** 200\n\n**PEL (mg/m\u00b3):** 950\n\n> tert-Butyl acetate | 540-88-5 | 200 | 950 | - |\n\nSource: \n", "cas_number": "540-88-5", "file": "tert-butyl-acetate.md", "generated": true, "harvested": "2026-08-05", "id": "tert-butyl-acetate", "pel_mgm3": "950", "pel_ppm": "200", "source_quote": "tert-Butyl acetate | 540-88-5 | 200 | 950 | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "tert-Butyl acetate", "title": "tert-Butyl acetate \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** tert-Butyl alcohol\n\n**CAS No.:** 75650\n\n**PEL (ppm):** 100\n\n**PEL (mg/m\u00b3):** 300\n\n**STEL (ppm):** 150\n\n**STEL (mg/m\u00b3):** 450\n\n> 75650 | | tert-Butyl alcohol | 100 | 300 | | 150 | 450\n\nSource: \n", "cas_number": "75650", "file": "tert-butyl-alcohol-2.md", "generated": true, "harvested": "2026-08-05", "id": "tert-butyl-alcohol-2", "pel_mgm3": "300", "pel_ppm": "100", "source_quote": "75650 | | tert-Butyl alcohol | 100 | 300 | | 150 | 450", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "stel_mgm3": "450", "stel_ppm": "150", "substance": "tert-Butyl alcohol", "title": "tert-Butyl alcohol \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** tert-Butyl alcohol\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - tert-Butyl alcohol\n\n**CAS No.:** 75-65-0\n\n> CAS No. 75-65-0\n\n**NIOSH REL (ppm):** TWA 100\n\n**NIOSH REL (mg/m\u00b3):** 300\n\n> NIOSH REL TWA 100 ppm (300 mg/m3) ST 150 ppm (450 mg/m3)\n\nSource: \n", "cas_number": "75-65-0", "file": "tert-butyl-alcohol-3.md", "generated": true, "harvested": "2026-09-08", "id": "tert-butyl-alcohol-3", "quote_cas_number": "CAS No. 75-65-0", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - tert-Butyl alcohol", "rel_mgm3": "300", "rel_ppm": "TWA 100", "source_quote": "NIOSH REL TWA 100 ppm (300 mg/m3) ST 150 ppm (450 mg/m3)", "sources": ["https://www.cdc.gov/niosh/npg/npgd0078.html"], "stale_after": "2027-09-08", "substance": "tert-Butyl alcohol", "title": "tert-Butyl alcohol \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** tert-Butyl alcohol\n\n**CAS No.:** 75-65-0\n\n**PEL (ppm):** 100\n\n**PEL (mg/m\u00b3):** 300\n\n> tert-Butyl alcohol | 75-65-0 | 100 | 300 | - |\n\nSource: \n", "cas_number": "75-65-0", "file": "tert-butyl-alcohol.md", "generated": true, "harvested": "2026-08-05", "id": "tert-butyl-alcohol", "pel_mgm3": "300", "pel_ppm": "100", "source_quote": "tert-Butyl alcohol | 75-65-0 | 100 | 300 | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "tert-Butyl alcohol", "title": "tert-Butyl alcohol \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** tert-Butyl chromate (as CrO3); see 1910.10266\n\n**CAS No.:** 1189-85-1\n\n> tert-Butyl chromate (as CrO3); see 1910.10266 | 1189-85-1 | - | - | - |\n\nSource: \n", "cas_number": "1189-85-1", "file": "tert-butyl-chromate-as-cro-3-see-1910-1026-6.md", "generated": true, "harvested": "2026-08-05", "id": "tert-butyl-chromate-as-cro-3-see-1910-1026-6", "source_quote": "tert-Butyl chromate (as CrO3); see 1910.10266 | 1189-85-1 | - | - | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "tert-Butyl chromate (as CrO3); see 1910.10266", "title": "tert-Butyl chromate (as CrO 3 ); see 1910.1026 6 \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** tert-Butyl chromate; di-tert-butyl Chromate, as CrO$3\n\n**CAS No.:** 1189851\n\n**PEL (mg/m\u00b3):** 0.1\n\n**Ceiling:** C\n\n> 1189851 | S | tert-Butyl chromate; di-tert-butyl Chromate, as CrO$3 | -- | 0.1 | C\n\nSource: \n", "cas_number": "1189851", "ceiling": "C", "file": "tert-butyl-chromate-di-tert-butyl-chromate-as-cro-3.md", "generated": true, "harvested": "2026-08-05", "id": "tert-butyl-chromate-di-tert-butyl-chromate-as-cro-3", "pel_mgm3": "0.1", "source_quote": "1189851 | S | tert-Butyl chromate; di-tert-butyl Chromate, as CrO$3 | -- | 0.1 | C", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "tert-Butyl chromate; di-tert-butyl Chromate, as CrO$3", "title": "tert-Butyl chromate; di-tert-butyl Chromate, as CrO $3 \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** tert-Butyl chromate\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - tert-Butyl chromate\n\n**CAS No.:** 1189-85-1\n\n> CAS No. 1189-85-1\n\n**NIOSH REL, as stated:** Ca TWA 0.001 mg Cr(VI)/m3 See Appendix A See Appendix C\n\n> NIOSH REL Ca TWA 0.001 mg Cr(VI)/m3 See Appendix A See Appendix C\n\nSource: \n", "cas_number": "1189-85-1", "file": "tert-butyl-chromate.md", "generated": true, "harvested": "2026-09-08", "id": "tert-butyl-chromate", "quote_cas_number": "CAS No. 1189-85-1", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - tert-Butyl chromate", "rel_statement": "Ca TWA 0.001 mg Cr(VI)/m3 See Appendix A See Appendix C", "source_quote": "NIOSH REL Ca TWA 0.001 mg Cr(VI)/m3 See Appendix A See Appendix C", "sources": ["https://www.cdc.gov/niosh/npg/npgd0080.html"], "stale_after": "2027-09-08", "substance": "tert-Butyl chromate", "title": "tert-Butyl chromate \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Tetrachloroethylene; see Perchloroethylene\n\n**CAS No.:** 127184\n\n> 127184 | | Tetrachloroethylene; see Perchloroethylene\n\nSource: \n", "cas_number": "127184", "file": "tetrachloroethylene-see-perchloroethylene.md", "generated": true, "harvested": "2026-08-05", "id": "tetrachloroethylene-see-perchloroethylene", "source_quote": "127184 | | Tetrachloroethylene; see Perchloroethylene", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Tetrachloroethylene; see Perchloroethylene", "title": "Tetrachloroethylene; see Perchloroethylene \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Tetrachloroethylene\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Tetrachloroethylene\n\n**CAS No.:** 127-18-4\n\n> CAS No. 127-18-4\n\n**NIOSH REL, as stated:** Ca Minimize workplace exposure concentrations. See Appendix A\n\n> NIOSH REL Ca Minimize workplace exposure concentrations. See Appendix A\n\nSource: \n", "cas_number": "127-18-4", "file": "tetrachloroethylene.md", "generated": true, "harvested": "2026-09-08", "id": "tetrachloroethylene", "quote_cas_number": "CAS No. 127-18-4", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Tetrachloroethylene", "rel_statement": "Ca Minimize workplace exposure concentrations. See Appendix A", "source_quote": "NIOSH REL Ca Minimize workplace exposure concentrations. See Appendix A", "sources": ["https://www.cdc.gov/niosh/npg/npgd0599.html"], "stale_after": "2027-09-08", "substance": "Tetrachloroethylene", "title": "Tetrachloroethylene \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Tetrachloromethane; see Carbon tetrachloride\n\n**CAS No.:** 56235\n\n> 56235 | | Tetrachloromethane; see Carbon tetrachloride\n\nSource: \n", "cas_number": "56235", "file": "tetrachloromethane-see-carbon-tetrachloride.md", "generated": true, "harvested": "2026-08-05", "id": "tetrachloromethane-see-carbon-tetrachloride", "source_quote": "56235 | | Tetrachloromethane; see Carbon tetrachloride", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Tetrachloromethane; see Carbon tetrachloride", "title": "Tetrachloromethane; see Carbon tetrachloride \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Tetrachloronaphthalene\n\n**CAS No.:** 1335882\n\n**PEL (mg/m\u00b3):** 2\n\n> 1335882 | S | Tetrachloronaphthalene | -- | 2\n\nSource: \n", "cas_number": "1335882", "file": "tetrachloronaphthalene-2.md", "generated": true, "harvested": "2026-08-05", "id": "tetrachloronaphthalene-2", "pel_mgm3": "2", "source_quote": "1335882 | S | Tetrachloronaphthalene | -- | 2", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Tetrachloronaphthalene", "title": "Tetrachloronaphthalene \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Tetrachloronaphthalene\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Tetrachloronaphthalene\n\n**CAS No.:** 1335-88-2\n\n> CAS No. 1335-88-2\n\n**NIOSH REL (mg/m\u00b3):** TWA 2\n\n> NIOSH REL TWA 2 mg/m3 [skin]\n\nSource: \n", "cas_number": "1335-88-2", "file": "tetrachloronaphthalene-3.md", "generated": true, "harvested": "2026-09-08", "id": "tetrachloronaphthalene-3", "quote_cas_number": "CAS No. 1335-88-2", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Tetrachloronaphthalene", "rel_mgm3": "TWA 2", "source_quote": "NIOSH REL TWA 2 mg/m3 [skin]", "sources": ["https://www.cdc.gov/niosh/npg/npgd0600.html"], "stale_after": "2027-09-08", "substance": "Tetrachloronaphthalene", "title": "Tetrachloronaphthalene \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Tetrachloronaphthalene\n\n**CAS No.:** 1335-88-2\n\n**PEL (mg/m\u00b3):** 2\n\n> Tetrachloronaphthalene | 1335-88-2 | - | 2 | X |\n\nSource: \n", "cas_number": "1335-88-2", "file": "tetrachloronaphthalene.md", "generated": true, "harvested": "2026-08-05", "id": "tetrachloronaphthalene", "pel_mgm3": "2", "source_quote": "Tetrachloronaphthalene | 1335-88-2 | - | 2 | X |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Tetrachloronaphthalene", "title": "Tetrachloronaphthalene \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Tetraethyl dithionopyrophosphate; see Sulfotep\n\n**CAS No.:** 3689245\n\n> 3689245 | | Tetraethyl dithionopyrophosphate; see Sulfotep\n\nSource: \n", "cas_number": "3689245", "file": "tetraethyl-dithionopyrophosphate-see-sulfotep.md", "generated": true, "harvested": "2026-08-05", "id": "tetraethyl-dithionopyrophosphate-see-sulfotep", "source_quote": "3689245 | | Tetraethyl dithionopyrophosphate; see Sulfotep", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Tetraethyl dithionopyrophosphate; see Sulfotep", "title": "Tetraethyl dithionopyrophosphate; see Sulfotep \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Tetraethyl lead (as Pb)\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Tetraethyl lead (as Pb)\n\n**CAS No.:** 78-00-2\n\n> CAS No. 78-00-2\n\n**NIOSH REL (mg/m\u00b3):** TWA 0.075\n\n> NIOSH REL TWA 0.075 mg/m3 [skin]\n\nSource: \n", "cas_number": "78-00-2", "file": "tetraethyl-lead-as-pb-2.md", "generated": true, "harvested": "2026-09-08", "id": "tetraethyl-lead-as-pb-2", "quote_cas_number": "CAS No. 78-00-2", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Tetraethyl lead (as Pb)", "rel_mgm3": "TWA 0.075", "source_quote": "NIOSH REL TWA 0.075 mg/m3 [skin]", "sources": ["https://www.cdc.gov/niosh/npg/npgd0601.html"], "stale_after": "2027-09-08", "substance": "Tetraethyl lead (as Pb)", "title": "Tetraethyl lead (as Pb) \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Tetraethyl lead (as Pb)\n\n**CAS No.:** 78-00-2\n\n**PEL (mg/m\u00b3):** 0.075\n\n> Tetraethyl lead (as Pb) | 78-00-2 | - | 0.075 | X |\n\nSource: \n", "cas_number": "78-00-2", "file": "tetraethyl-lead-as-pb.md", "generated": true, "harvested": "2026-08-05", "id": "tetraethyl-lead-as-pb", "pel_mgm3": "0.075", "source_quote": "Tetraethyl lead (as Pb) | 78-00-2 | - | 0.075 | X |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Tetraethyl lead (as Pb)", "title": "Tetraethyl lead (as Pb) \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Tetraethyl lead; tetraethylplumbane, as Pb\n\n**CAS No.:** 78002\n\n**PEL (mg/m\u00b3):** 0.075\n\n> 78002 | S | Tetraethyl lead; tetraethylplumbane, as Pb | -- | 0.075\n\nSource: \n", "cas_number": "78002", "file": "tetraethyl-lead-tetraethylplumbane-as-pb.md", "generated": true, "harvested": "2026-08-05", "id": "tetraethyl-lead-tetraethylplumbane-as-pb", "pel_mgm3": "0.075", "source_quote": "78002 | S | Tetraethyl lead; tetraethylplumbane, as Pb | -- | 0.075", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Tetraethyl lead; tetraethylplumbane, as Pb", "title": "Tetraethyl lead; tetraethylplumbane, as Pb \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Tetraethyl pyrophosphate; see TEPP\n\n**CAS No.:** 107493\n\n> 107493 | | Tetraethyl pyrophosphate; see TEPP\n\nSource: \n", "cas_number": "107493", "file": "tetraethyl-pyrophosphate-see-tepp.md", "generated": true, "harvested": "2026-08-05", "id": "tetraethyl-pyrophosphate-see-tepp", "source_quote": "107493 | | Tetraethyl pyrophosphate; see TEPP", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Tetraethyl pyrophosphate; see TEPP", "title": "Tetraethyl pyrophosphate; see TEPP \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Tetrahydrofuran\n\n**CAS No.:** 109999\n\n**PEL (ppm):** 200\n\n**PEL (mg/m\u00b3):** 590\n\n**STEL (ppm):** 250\n\n**STEL (mg/m\u00b3):** 735\n\n> 109999 | | Tetrahydrofuran | 200 | 590 | | 250 | 735\n\nSource: \n", "cas_number": "109999", "file": "tetrahydrofuran-2.md", "generated": true, "harvested": "2026-08-05", "id": "tetrahydrofuran-2", "pel_mgm3": "590", "pel_ppm": "200", "source_quote": "109999 | | Tetrahydrofuran | 200 | 590 | | 250 | 735", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "stel_mgm3": "735", "stel_ppm": "250", "substance": "Tetrahydrofuran", "title": "Tetrahydrofuran \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Tetrahydrofuran\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Tetrahydrofuran\n\n**CAS No.:** 109-99-9\n\n> CAS No. 109-99-9\n\n**NIOSH REL (ppm):** TWA 200\n\n**NIOSH REL (mg/m\u00b3):** 590\n\n> NIOSH REL TWA 200 ppm (590 mg/m3) ST 250 ppm (735 mg/m3)\n\nSource: \n", "cas_number": "109-99-9", "file": "tetrahydrofuran-3.md", "generated": true, "harvested": "2026-09-08", "id": "tetrahydrofuran-3", "quote_cas_number": "CAS No. 109-99-9", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Tetrahydrofuran", "rel_mgm3": "590", "rel_ppm": "TWA 200", "source_quote": "NIOSH REL TWA 200 ppm (590 mg/m3) ST 250 ppm (735 mg/m3)", "sources": ["https://www.cdc.gov/niosh/npg/npgd0602.html"], "stale_after": "2027-09-08", "substance": "Tetrahydrofuran", "title": "Tetrahydrofuran \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Tetrahydrofuran\n\n**CAS No.:** 109-99-9\n\n**PEL (ppm):** 200\n\n**PEL (mg/m\u00b3):** 590\n\n> Tetrahydrofuran | 109-99-9 | 200 | 590 | - |\n\nSource: \n", "cas_number": "109-99-9", "file": "tetrahydrofuran.md", "generated": true, "harvested": "2026-08-05", "id": "tetrahydrofuran", "pel_mgm3": "590", "pel_ppm": "200", "source_quote": "Tetrahydrofuran | 109-99-9 | 200 | 590 | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Tetrahydrofuran", "title": "Tetrahydrofuran \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Tetramethyl lead (as Pb)\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Tetramethyl lead (as Pb)\n\n**CAS No.:** 75-74-1\n\n> CAS No. 75-74-1\n\n**NIOSH REL (mg/m\u00b3):** TWA 0.075\n\n> NIOSH REL TWA 0.075 mg/m3 [skin]\n\nSource: \n", "cas_number": "75-74-1", "file": "tetramethyl-lead-as-pb-2.md", "generated": true, "harvested": "2026-09-08", "id": "tetramethyl-lead-as-pb-2", "quote_cas_number": "CAS No. 75-74-1", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Tetramethyl lead (as Pb)", "rel_mgm3": "TWA 0.075", "source_quote": "NIOSH REL TWA 0.075 mg/m3 [skin]", "sources": ["https://www.cdc.gov/niosh/npg/npgd0603.html"], "stale_after": "2027-09-08", "substance": "Tetramethyl lead (as Pb)", "title": "Tetramethyl lead (as Pb) \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Tetramethyl lead (as Pb)\n\n**CAS No.:** 75-74-1\n\n**PEL (mg/m\u00b3):** 0.075\n\n> Tetramethyl lead (as Pb) | 75-74-1 | - | 0.075 | X |\n\nSource: \n", "cas_number": "75-74-1", "file": "tetramethyl-lead-as-pb.md", "generated": true, "harvested": "2026-08-05", "id": "tetramethyl-lead-as-pb", "pel_mgm3": "0.075", "source_quote": "Tetramethyl lead (as Pb) | 75-74-1 | - | 0.075 | X |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Tetramethyl lead (as Pb)", "title": "Tetramethyl lead (as Pb) \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Tetramethyl lead; tetramethylplumbane, as Pb\n\n**CAS No.:** 75741\n\n**PEL (mg/m\u00b3):** 0.075\n\n> 75741 | S | Tetramethyl lead; tetramethylplumbane, as Pb | -- | 0.075\n\nSource: \n", "cas_number": "75741", "file": "tetramethyl-lead-tetramethylplumbane-as-pb.md", "generated": true, "harvested": "2026-08-05", "id": "tetramethyl-lead-tetramethylplumbane-as-pb", "pel_mgm3": "0.075", "source_quote": "75741 | S | Tetramethyl lead; tetramethylplumbane, as Pb | -- | 0.075", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Tetramethyl lead; tetramethylplumbane, as Pb", "title": "Tetramethyl lead; tetramethylplumbane, as Pb \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Tetramethyl succinonitrile\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Tetramethyl succinonitrile\n\n**CAS No.:** 3333-52-6\n\n> CAS No. 3333-52-6\n\n**NIOSH REL (ppm):** 0.5\n\n**NIOSH REL (mg/m\u00b3):** TWA 3\n\n> NIOSH REL TWA 3 mg/m3 (0.5 ppm) [skin]\n\nSource: \n", "cas_number": "3333-52-6", "file": "tetramethyl-succinonitrile-2.md", "generated": true, "harvested": "2026-09-08", "id": "tetramethyl-succinonitrile-2", "quote_cas_number": "CAS No. 3333-52-6", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Tetramethyl succinonitrile", "rel_mgm3": "TWA 3", "rel_ppm": "0.5", "source_quote": "NIOSH REL TWA 3 mg/m3 (0.5 ppm) [skin]", "sources": ["https://www.cdc.gov/niosh/npg/npgd0604.html"], "stale_after": "2027-09-08", "substance": "Tetramethyl succinonitrile", "title": "Tetramethyl succinonitrile \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Tetramethyl succinonitrile (decomposition product of 2,2\u2032-azobisisobutyronitrile)\n\n**CAS No.:** 3333526\n\n**PEL (ppm):** 0.5\n\n**PEL (mg/m\u00b3):** 3\n\n> 3333526 | S | Tetramethyl succinonitrile (decomposition product of 2,2\u2032-azobisisobutyronitrile) | 0.5 | 3\n\nSource: \n", "cas_number": "3333526", "file": "tetramethyl-succinonitrile-decomposition-product-of-2-2-azobisisobutyronitrile.md", "generated": true, "harvested": "2026-08-05", "id": "tetramethyl-succinonitrile-decomposition-product-of-2-2-azobisisobutyronitrile", "pel_mgm3": "3", "pel_ppm": "0.5", "source_quote": "3333526 | S | Tetramethyl succinonitrile (decomposition product of 2,2\u2032-azobisisobutyronitrile) | 0.5 | 3", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Tetramethyl succinonitrile (decomposition product of 2,2\u2032-azobisisobutyronitrile)", "title": "Tetramethyl succinonitrile (decomposition product of 2,2\u2032-azobisisobutyronitrile) \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Tetramethyl succinonitrile\n\n**CAS No.:** 3333-52-6\n\n**PEL (ppm):** 0.5\n\n**PEL (mg/m\u00b3):** 3\n\n> Tetramethyl succinonitrile | 3333-52-6 | 0.5 | 3 | X |\n\nSource: \n", "cas_number": "3333-52-6", "file": "tetramethyl-succinonitrile.md", "generated": true, "harvested": "2026-08-05", "id": "tetramethyl-succinonitrile", "pel_mgm3": "3", "pel_ppm": "0.5", "source_quote": "Tetramethyl succinonitrile | 3333-52-6 | 0.5 | 3 | X |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Tetramethyl succinonitrile", "title": "Tetramethyl succinonitrile \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Tetramethyl thiuram disulfide, see Thiram\n\n**CAS No.:** 137268\n\n> 137268 | | Tetramethyl thiuram disulfide, see Thiram\n\nSource: \n", "cas_number": "137268", "file": "tetramethyl-thiuram-disulfide-see-thiram.md", "generated": true, "harvested": "2026-08-05", "id": "tetramethyl-thiuram-disulfide-see-thiram", "source_quote": "137268 | | Tetramethyl thiuram disulfide, see Thiram", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Tetramethyl thiuram disulfide, see Thiram", "title": "Tetramethyl thiuram disulfide, see Thiram \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Tetramethylolmethane; see Pentaerythritol\n\n**CAS No.:** 115775\n\n> 115775 | | Tetramethylolmethane; see Pentaerythritol\n\nSource: \n", "cas_number": "115775", "file": "tetramethylolmethane-see-pentaerythritol.md", "generated": true, "harvested": "2026-08-05", "id": "tetramethylolmethane-see-pentaerythritol", "source_quote": "115775 | | Tetramethylolmethane; see Pentaerythritol", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Tetramethylolmethane; see Pentaerythritol", "title": "Tetramethylolmethane; see Pentaerythritol \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Tetranitromethane\n\n**CAS No.:** 509148\n\n**PEL (ppm):** 0.005\n\n**PEL (mg/m\u00b3):** 0.04\n\n> 509148 | | Tetranitromethane | 0.005 | 0.04\n\nSource: \n", "cas_number": "509148", "file": "tetranitromethane-2.md", "generated": true, "harvested": "2026-08-05", "id": "tetranitromethane-2", "pel_mgm3": "0.04", "pel_ppm": "0.005", "source_quote": "509148 | | Tetranitromethane | 0.005 | 0.04", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Tetranitromethane", "title": "Tetranitromethane \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Tetranitromethane\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Tetranitromethane\n\n**CAS No.:** 509-14-8\n\n> CAS No. 509-14-8\n\n**NIOSH REL (ppm):** TWA 1\n\n**NIOSH REL (mg/m\u00b3):** 8\n\n> NIOSH REL TWA 1 ppm (8 mg/m3)\n\nSource: \n", "cas_number": "509-14-8", "file": "tetranitromethane-3.md", "generated": true, "harvested": "2026-09-08", "id": "tetranitromethane-3", "quote_cas_number": "CAS No. 509-14-8", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Tetranitromethane", "rel_mgm3": "8", "rel_ppm": "TWA 1", "source_quote": "NIOSH REL TWA 1 ppm (8 mg/m3)", "sources": ["https://www.cdc.gov/niosh/npg/npgd0605.html"], "stale_after": "2027-09-08", "substance": "Tetranitromethane", "title": "Tetranitromethane \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Tetranitromethane\n\n**CAS No.:** 509-14-8\n\n**PEL (ppm):** 1\n\n**PEL (mg/m\u00b3):** 8\n\n> Tetranitromethane | 509-14-8 | 1 | 8 | - |\n\nSource: \n", "cas_number": "509-14-8", "file": "tetranitromethane.md", "generated": true, "harvested": "2026-08-05", "id": "tetranitromethane", "pel_mgm3": "8", "pel_ppm": "1", "source_quote": "Tetranitromethane | 509-14-8 | 1 | 8 | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Tetranitromethane", "title": "Tetranitromethane \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Tetrasodium pyrophosphate\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Tetrasodium pyrophosphate\n\n**CAS No.:** 7722-88-5\n\n> CAS No. 7722-88-5\n\n**NIOSH REL (mg/m\u00b3):** TWA 5\n\n> NIOSH REL TWA 5 mg/m3\n\nSource: \n", "cas_number": "7722-88-5", "file": "tetrasodium-pyrophosphate-2.md", "generated": true, "harvested": "2026-09-08", "id": "tetrasodium-pyrophosphate-2", "quote_cas_number": "CAS No. 7722-88-5", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Tetrasodium pyrophosphate", "rel_mgm3": "TWA 5", "source_quote": "NIOSH REL TWA 5 mg/m3", "sources": ["https://www.cdc.gov/niosh/npg/npgd0606.html"], "stale_after": "2027-09-08", "substance": "Tetrasodium pyrophosphate", "title": "Tetrasodium pyrophosphate \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Tetrasodium pyrophosphate\n\n**CAS No.:** 7722885\n\n**PEL (mg/m\u00b3):** 5\n\n> 7722885 | | Tetrasodium pyrophosphate | -- | 5\n\nSource: \n", "cas_number": "7722885", "file": "tetrasodium-pyrophosphate.md", "generated": true, "harvested": "2026-08-05", "id": "tetrasodium-pyrophosphate", "pel_mgm3": "5", "source_quote": "7722885 | | Tetrasodium pyrophosphate | -- | 5", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Tetrasodium pyrophosphate", "title": "Tetrasodium pyrophosphate \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Tetryl; 2,4,6-trinitrophenylmethylnitramine\n\n**CAS No.:** 479458\n\n**PEL (mg/m\u00b3):** 1.5\n\n> 479458 | S | Tetryl; 2,4,6-trinitrophenylmethylnitramine | -- | 1.5\n\nSource: \n", "cas_number": "479458", "file": "tetryl-2-4-6-trinitrophenylmethylnitramine-2.md", "generated": true, "harvested": "2026-08-05", "id": "tetryl-2-4-6-trinitrophenylmethylnitramine-2", "pel_mgm3": "1.5", "source_quote": "479458 | S | Tetryl; 2,4,6-trinitrophenylmethylnitramine | -- | 1.5", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Tetryl; 2,4,6-trinitrophenylmethylnitramine", "title": "Tetryl; 2,4,6-trinitrophenylmethylnitramine \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Tetryl (2,4,6-Trinitrophenylmethylnitramine)\n\n**CAS No.:** 479-45-8\n\n**PEL (mg/m\u00b3):** 1.5\n\n> Tetryl (2,4,6-Trinitrophenylmethylnitramine) | 479-45-8 | - | 1.5 | X |\n\nSource: \n", "cas_number": "479-45-8", "file": "tetryl-2-4-6-trinitrophenylmethylnitramine.md", "generated": true, "harvested": "2026-08-05", "id": "tetryl-2-4-6-trinitrophenylmethylnitramine", "pel_mgm3": "1.5", "source_quote": "Tetryl (2,4,6-Trinitrophenylmethylnitramine) | 479-45-8 | - | 1.5 | X |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Tetryl (2,4,6-Trinitrophenylmethylnitramine)", "title": "Tetryl (2,4,6-Trinitrophenylmethylnitramine) \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Tetryl\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Tetryl\n\n**CAS No.:** 479-45-8\n\n> CAS No. 479-45-8\n\n**NIOSH REL (mg/m\u00b3):** TWA 1.5\n\n> NIOSH REL TWA 1.5 mg/m3 [skin]\n\nSource: \n", "cas_number": "479-45-8", "file": "tetryl.md", "generated": true, "harvested": "2026-09-08", "id": "tetryl", "quote_cas_number": "CAS No. 479-45-8", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Tetryl", "rel_mgm3": "TWA 1.5", "source_quote": "NIOSH REL TWA 1.5 mg/m3 [skin]", "sources": ["https://www.cdc.gov/niosh/npg/npgd0607.html"], "stale_after": "2027-09-08", "substance": "Tetryl", "title": "Tetryl \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Thallium, soluble compounds (as Tl)\n\n**CAS No.:** 7440-28-0\n\n**PEL (mg/m\u00b3):** 0.1\n\n> Thallium, soluble compounds (as Tl) | 7440-28-0 | - | 0.1 | X |\n\nSource: \n", "cas_number": "7440-28-0", "file": "thallium-soluble-compounds-as-tl.md", "generated": true, "harvested": "2026-08-05", "id": "thallium-soluble-compounds-as-tl", "pel_mgm3": "0.1", "source_quote": "Thallium, soluble compounds (as Tl) | 7440-28-0 | - | 0.1 | X |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Thallium, soluble compounds (as Tl)", "title": "Thallium, soluble compounds (as Tl) \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** THF; see Tetrahydrofuran\n\n**CAS No.:** 109999\n\n> 109999 | | THF; see Tetrahydrofuran\n\nSource: \n", "cas_number": "109999", "file": "thf-see-tetrahydrofuran.md", "generated": true, "harvested": "2026-08-05", "id": "thf-see-tetrahydrofuran", "source_quote": "109999 | | THF; see Tetrahydrofuran", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "THF; see Tetrahydrofuran", "title": "THF; see Tetrahydrofuran \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Thioglycolic acid\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Thioglycolic acid\n\n**CAS No.:** 68-11-1\n\n> CAS No. 68-11-1\n\n**NIOSH REL (ppm):** TWA 1\n\n**NIOSH REL (mg/m\u00b3):** 4\n\n> NIOSH REL TWA 1 ppm (4 mg/m3) [skin]\n\nSource: \n", "cas_number": "68-11-1", "file": "thioglycolic-acid-2.md", "generated": true, "harvested": "2026-09-08", "id": "thioglycolic-acid-2", "quote_cas_number": "CAS No. 68-11-1", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Thioglycolic acid", "rel_mgm3": "4", "rel_ppm": "TWA 1", "source_quote": "NIOSH REL TWA 1 ppm (4 mg/m3) [skin]", "sources": ["https://www.cdc.gov/niosh/npg/npgd0610.html"], "stale_after": "2027-09-08", "substance": "Thioglycolic acid", "title": "Thioglycolic acid \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Thioglycolic acid\n\n**CAS No.:** 68111\n\n**PEL (ppm):** 1\n\n**PEL (mg/m\u00b3):** 3.8\n\n> 68111 | S | Thioglycolic acid | 1 | 3.8\n\nSource: \n", "cas_number": "68111", "file": "thioglycolic-acid.md", "generated": true, "harvested": "2026-08-05", "id": "thioglycolic-acid", "pel_mgm3": "3.8", "pel_ppm": "1", "source_quote": "68111 | S | Thioglycolic acid | 1 | 3.8", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Thioglycolic acid", "title": "Thioglycolic acid \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Thionyl chloride\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Thionyl chloride\n\n**CAS No.:** 7719-09-7\n\n> CAS No. 7719-09-7\n\n**NIOSH REL (ppm):** C 1\n\n**NIOSH REL (mg/m\u00b3):** 5\n\n> NIOSH REL C 1 ppm (5 mg/m3)\n\nSource: \n", "cas_number": "7719-09-7", "file": "thionyl-chloride-2.md", "generated": true, "harvested": "2026-09-08", "id": "thionyl-chloride-2", "quote_cas_number": "CAS No. 7719-09-7", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Thionyl chloride", "rel_mgm3": "5", "rel_ppm": "C 1", "source_quote": "NIOSH REL C 1 ppm (5 mg/m3)", "sources": ["https://www.cdc.gov/niosh/npg/npgd0611.html"], "stale_after": "2027-09-08", "substance": "Thionyl chloride", "title": "Thionyl chloride \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Thionyl chloride\n\n**CAS No.:** 7719097\n\n**PEL (ppm):** 1\n\n**PEL (mg/m\u00b3):** 5\n\n**Ceiling:** C\n\n> 7719097 | | Thionyl chloride | 1 | 5 | C\n\nSource: \n", "cas_number": "7719097", "ceiling": "C", "file": "thionyl-chloride.md", "generated": true, "harvested": "2026-08-05", "id": "thionyl-chloride", "pel_mgm3": "5", "pel_ppm": "1", "source_quote": "7719097 | | Thionyl chloride | 1 | 5 | C", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Thionyl chloride", "title": "Thionyl chloride \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Thiram\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Thiram\n\n**CAS No.:** 137-26-8\n\n> CAS No. 137-26-8\n\n**NIOSH REL (mg/m\u00b3):** TWA 5\n\n> NIOSH REL TWA 5 mg/m3\n\nSource: \n", "cas_number": "137-26-8", "file": "thiram-2.md", "generated": true, "harvested": "2026-09-08", "id": "thiram-2", "quote_cas_number": "CAS No. 137-26-8", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Thiram", "rel_mgm3": "TWA 5", "source_quote": "NIOSH REL TWA 5 mg/m3", "sources": ["https://www.cdc.gov/niosh/npg/npgd0612.html"], "stale_after": "2027-09-08", "substance": "Thiram", "title": "Thiram \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Thiram; bis(dimethylthiocarbamoyl) disulfide\n\n**CAS No.:** 137268\n\n**PEL (mg/m\u00b3):** 5\n\n> 137268 | | Thiram; bis(dimethylthiocarbamoyl) disulfide | -- | 5\n\nSource: \n", "cas_number": "137268", "file": "thiram-bis-dimethylthiocarbamoyl-disulfide.md", "generated": true, "harvested": "2026-08-05", "id": "thiram-bis-dimethylthiocarbamoyl-disulfide", "pel_mgm3": "5", "source_quote": "137268 | | Thiram; bis(dimethylthiocarbamoyl) disulfide | -- | 5", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Thiram; bis(dimethylthiocarbamoyl) disulfide", "title": "Thiram; bis(dimethylthiocarbamoyl) disulfide \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Thiram\n\n**CAS No.:** 137-26-8\n\n**PEL (mg/m\u00b3):** 5\n\n> Thiram | 137-26-8 | - | 5 | - |\n\nSource: \n", "cas_number": "137-26-8", "file": "thiram.md", "generated": true, "harvested": "2026-08-05", "id": "thiram", "pel_mgm3": "5", "source_quote": "Thiram | 137-26-8 | - | 5 | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Thiram", "title": "Thiram \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Tin(II) oxide (as Sn)\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Tin(II) oxide (as Sn)\n\n**CAS No.:** 21651-19-4\n\n> CAS No. 21651-19-4\n\n**NIOSH REL (mg/m\u00b3):** TWA 2\n\n> NIOSH REL TWA 2 mg/m3\n\nSource: \n", "cas_number": "21651-19-4", "file": "tin-ii-oxide-as-sn.md", "generated": true, "harvested": "2026-09-08", "id": "tin-ii-oxide-as-sn", "quote_cas_number": "CAS No. 21651-19-4", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Tin(II) oxide (as Sn)", "rel_mgm3": "TWA 2", "source_quote": "NIOSH REL TWA 2 mg/m3", "sources": ["https://www.cdc.gov/niosh/npg/npgd0615.html"], "stale_after": "2027-09-08", "substance": "Tin(II) oxide (as Sn)", "title": "Tin(II) oxide (as Sn) \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Tin, inorganic compounds (except oxides) (as Sn)\n\n**CAS No.:** 7440-31-5\n\n**PEL (mg/m\u00b3):** 2\n\n> Tin, inorganic compounds (except oxides) (as Sn) | 7440-31-5 | - | 2 | - |\n\nSource: \n", "cas_number": "7440-31-5", "file": "tin-inorganic-compounds-except-oxides-as-sn.md", "generated": true, "harvested": "2026-08-05", "id": "tin-inorganic-compounds-except-oxides-as-sn", "pel_mgm3": "2", "source_quote": "Tin, inorganic compounds (except oxides) (as Sn) | 7440-31-5 | - | 2 | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Tin, inorganic compounds (except oxides) (as Sn)", "title": "Tin, inorganic compounds (except oxides) (as Sn) \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Tin(IV) oxide (as Sn)\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Tin(IV) oxide (as Sn)\n\n**CAS No.:** 18282-10-5\n\n> CAS No. 18282-10-5\n\n**NIOSH REL (mg/m\u00b3):** TWA 2\n\n> NIOSH REL TWA 2 mg/m3\n\nSource: \n", "cas_number": "18282-10-5", "file": "tin-iv-oxide-as-sn.md", "generated": true, "harvested": "2026-09-08", "id": "tin-iv-oxide-as-sn", "quote_cas_number": "CAS No. 18282-10-5", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Tin(IV) oxide (as Sn)", "rel_mgm3": "TWA 2", "source_quote": "NIOSH REL TWA 2 mg/m3", "sources": ["https://www.cdc.gov/niosh/npg/npgd0616.html"], "stale_after": "2027-09-08", "substance": "Tin(IV) oxide (as Sn)", "title": "Tin(IV) oxide (as Sn) \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Tin, organic compounds (as Sn)\n\n**CAS No.:** 7440-31-5\n\n**PEL (mg/m\u00b3):** 0.1\n\n> Tin, organic compounds (as Sn) | 7440-31-5 | - | 0.1 | - |\n\nSource: \n", "cas_number": "7440-31-5", "file": "tin-organic-compounds-as-sn.md", "generated": true, "harvested": "2026-08-05", "id": "tin-organic-compounds-as-sn", "pel_mgm3": "0.1", "source_quote": "Tin, organic compounds (as Sn) | 7440-31-5 | - | 0.1 | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Tin, organic compounds (as Sn)", "title": "Tin, organic compounds (as Sn) \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Tin, tin oxide and inorganic compounds, except SnH $4, as Sn\n\n**CAS No.:** 21651194\n\n**PEL (mg/m\u00b3):** 2\n\n> 21651194 | | Tin, tin oxide and inorganic compounds, except SnH $4, as Sn | -- | 2\n\nSource: \n", "cas_number": "21651194", "file": "tin-tin-oxide-and-inorganic-compounds-except-snh-4-as-sn.md", "generated": true, "harvested": "2026-08-05", "id": "tin-tin-oxide-and-inorganic-compounds-except-snh-4-as-sn", "pel_mgm3": "2", "source_quote": "21651194 | | Tin, tin oxide and inorganic compounds, except SnH $4, as Sn | -- | 2", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Tin, tin oxide and inorganic compounds, except SnH $4, as Sn", "title": "Tin, tin oxide and inorganic compounds, except SnH $4 , as Sn \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Tin\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Tin\n\n**CAS No.:** 7440-31-5\n\n> CAS No. 7440-31-5\n\n**NIOSH REL (mg/m\u00b3):** TWA 2\n\n> NIOSH REL TWA 2 mg/m3\n\nSource: \n", "cas_number": "7440-31-5", "file": "tin.md", "generated": true, "harvested": "2026-09-08", "id": "tin", "quote_cas_number": "CAS No. 7440-31-5", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Tin", "rel_mgm3": "TWA 2", "source_quote": "NIOSH REL TWA 2 mg/m3", "sources": ["https://www.cdc.gov/niosh/npg/npgd0613.html"], "stale_after": "2027-09-08", "substance": "Tin", "title": "Tin \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Titanium dioxide\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Titanium dioxide\n\n**CAS No.:** 13463-67-7\n\n> CAS No. 13463-67-7\n\n**NIOSH REL, as stated:** Ca See Appendix A\n\n> NIOSH REL Ca See Appendix A\n\nSource: \n", "cas_number": "13463-67-7", "file": "titanium-dioxide-2.md", "generated": true, "harvested": "2026-09-08", "id": "titanium-dioxide-2", "quote_cas_number": "CAS No. 13463-67-7", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Titanium dioxide", "rel_statement": "Ca See Appendix A", "source_quote": "NIOSH REL Ca See Appendix A", "sources": ["https://www.cdc.gov/niosh/npg/npgd0617.html"], "stale_after": "2027-09-08", "substance": "Titanium dioxide", "title": "Titanium dioxide \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Titanium dioxide, as Ti; see Particulates not otherwise regulated\n\n**CAS No.:** 13463677\n\n> 13463677 | | Titanium dioxide, as Ti; see Particulates not otherwise regulated\n\nSource: \n", "cas_number": "13463677", "file": "titanium-dioxide-as-ti-see-particulates-not-otherwise-regulated.md", "generated": true, "harvested": "2026-08-05", "id": "titanium-dioxide-as-ti-see-particulates-not-otherwise-regulated", "source_quote": "13463677 | | Titanium dioxide, as Ti; see Particulates not otherwise regulated", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Titanium dioxide, as Ti; see Particulates not otherwise regulated", "title": "Titanium dioxide, as Ti; see Particulates not otherwise regulated \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Titanium dioxide\n\n**CAS No.:** 13463-67-7\n\n> Titanium dioxide | 13463-67-7 | - | - | - |\n\nSource: \n", "cas_number": "13463-67-7", "file": "titanium-dioxide.md", "generated": true, "harvested": "2026-08-05", "id": "titanium-dioxide", "source_quote": "Titanium dioxide | 13463-67-7 | - | - | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Titanium dioxide", "title": "Titanium dioxide \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** TMTD; see Thiram\n\n**CAS No.:** 137268\n\n> 137268 | | TMTD; see Thiram\n\nSource: \n", "cas_number": "137268", "file": "tmtd-see-thiram.md", "generated": true, "harvested": "2026-08-05", "id": "tmtd-see-thiram", "source_quote": "137268 | | TMTD; see Thiram", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "TMTD; see Thiram", "title": "TMTD; see Thiram \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** TNT; see 2,4,6-Trinitrotoluene\n\n**CAS No.:** 118967\n\n> 118967 | | TNT; see 2,4,6-Trinitrotoluene\n\nSource: \n", "cas_number": "118967", "file": "tnt-see-2-4-6-trinitrotoluene.md", "generated": true, "harvested": "2026-08-05", "id": "tnt-see-2-4-6-trinitrotoluene", "source_quote": "118967 | | TNT; see 2,4,6-Trinitrotoluene", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "TNT; see 2,4,6-Trinitrotoluene", "title": "TNT; see 2,4,6-Trinitrotoluene \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Toluene-2,4-diisocyanate; TDI\n\n**CAS No.:** 584849\n\n**PEL (ppm):** 0.005\n\n**PEL (mg/m\u00b3):** 0.04\n\n**Ceiling:** 0.02 ppm\n\n**STEL (ppm):** 0.02\n\n**STEL (mg/m\u00b3):** 0.15\n\n> 584849 | | Toluene-2,4-diisocyanate; TDI | 0.005 | 0.04 | 0.02 ppm | 0.02 | 0.15\n\nSource: \n", "cas_number": "584849", "ceiling": "0.02 ppm", "file": "toluene-2-4-diisocyanate-tdi-2.md", "generated": true, "harvested": "2026-08-05", "id": "toluene-2-4-diisocyanate-tdi-2", "pel_mgm3": "0.04", "pel_ppm": "0.005", "source_quote": "584849 | | Toluene-2,4-diisocyanate; TDI | 0.005 | 0.04 | 0.02 ppm | 0.02 | 0.15", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "stel_mgm3": "0.15", "stel_ppm": "0.02", "substance": "Toluene-2,4-diisocyanate; TDI", "title": "Toluene-2,4-diisocyanate; TDI \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Toluene-2,4-diisocyanate (TDI)\n\n**CAS No.:** 584-84-9\n\n**PEL (ppm):** (C)0.02\n\n**PEL (mg/m\u00b3):** (C)0.14\n\n> Toluene-2,4-diisocyanate (TDI) | 584-84-9 | (C)0.02 | (C)0.14 | - |\n\nSource: \n", "cas_number": "584-84-9", "file": "toluene-2-4-diisocyanate-tdi.md", "generated": true, "harvested": "2026-08-05", "id": "toluene-2-4-diisocyanate-tdi", "pel_mgm3": "(C)0.14", "pel_ppm": "(C)0.02", "source_quote": "Toluene-2,4-diisocyanate (TDI) | 584-84-9 | (C)0.02 | (C)0.14 | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Toluene-2,4-diisocyanate (TDI)", "title": "Toluene-2,4-diisocyanate (TDI) \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Toluene-2,4-diisocyanate\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Toluene-2,4-diisocyanate\n\n**CAS No.:** 584-84-9\n\n> CAS No. 584-84-9\n\n**NIOSH REL, as stated:** Ca See Appendix A\n\n> NIOSH REL Ca See Appendix A\n\nSource: \n", "cas_number": "584-84-9", "file": "toluene-2-4-diisocyanate.md", "generated": true, "harvested": "2026-09-08", "id": "toluene-2-4-diisocyanate", "quote_cas_number": "CAS No. 584-84-9", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Toluene-2,4-diisocyanate", "rel_statement": "Ca See Appendix A", "source_quote": "NIOSH REL Ca See Appendix A", "sources": ["https://www.cdc.gov/niosh/npg/npgd0621.html"], "stale_after": "2027-09-08", "substance": "Toluene-2,4-diisocyanate", "title": "Toluene-2,4-diisocyanate \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Toluene\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Toluene\n\n**CAS No.:** 108-88-3\n\n> CAS No. 108-88-3\n\n**NIOSH REL (ppm):** TWA 100\n\n**NIOSH REL (mg/m\u00b3):** 375\n\n> NIOSH REL TWA 100 ppm (375 mg/m3) ST 150 ppm (560 mg/m3)\n\nSource: \n", "cas_number": "108-88-3", "file": "toluene-2.md", "generated": true, "harvested": "2026-09-08", "id": "toluene-2", "quote_cas_number": "CAS No. 108-88-3", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Toluene", "rel_mgm3": "375", "rel_ppm": "TWA 100", "source_quote": "NIOSH REL TWA 100 ppm (375 mg/m3) ST 150 ppm (560 mg/m3)", "sources": ["https://www.cdc.gov/niosh/npg/npgd0619.html"], "stale_after": "2027-09-08", "substance": "Toluene", "title": "Toluene \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Toluene; toluol\n\n**CAS No.:** 108883\n\n**PEL (ppm):** 10\n\n**PEL (mg/m\u00b3):** 37\n\n**Ceiling:** 500 ppm\n\n**STEL (ppm):** 150\n\n**STEL (mg/m\u00b3):** 560\n\n> 108883 | S | Toluene; toluol | 10 | 37 | 500 ppm | 150 | 560\n\nSource: \n", "cas_number": "108883", "ceiling": "500 ppm", "file": "toluene-toluol.md", "generated": true, "harvested": "2026-08-05", "id": "toluene-toluol", "pel_mgm3": "37", "pel_ppm": "10", "source_quote": "108883 | S | Toluene; toluol | 10 | 37 | 500 ppm | 150 | 560", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "stel_mgm3": "560", "stel_ppm": "150", "substance": "Toluene; toluol", "title": "Toluene; toluol \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Toluene\n\n**CAS No.:** 108-88-3\n\n> Toluene | 108-88-3 | - | (2) | - |\n\nSource: \n", "cas_number": "108-88-3", "file": "toluene.md", "generated": true, "harvested": "2026-08-05", "id": "toluene", "source_quote": "Toluene | 108-88-3 | - | (2) | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Toluene", "title": "Toluene \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Toluenediamine\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Toluenediamine\n\n**CAS No.:** 25376-45-8 95-80-7 (2,4-TDA)\n\n> CAS No. 25376-45-8 95-80-7 (2,4-TDA)\n\n**NIOSH REL, as stated:** Ca (all isomers) See Appendix A\n\n> NIOSH REL Ca (all isomers) See Appendix A\n\nSource: \n", "cas_number": "25376-45-8 95-80-7 (2,4-TDA)", "file": "toluenediamine.md", "generated": true, "harvested": "2026-09-08", "id": "toluenediamine", "quote_cas_number": "CAS No. 25376-45-8 95-80-7 (2,4-TDA)", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Toluenediamine", "rel_statement": "Ca (all isomers) See Appendix A", "source_quote": "NIOSH REL Ca (all isomers) See Appendix A", "sources": ["https://www.cdc.gov/niosh/npg/npgd0620.html"], "stale_after": "2027-09-08", "substance": "Toluenediamine", "title": "Toluenediamine \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Toxaphene; see Chlorinated camphene\n\n**CAS No.:** 8001352\n\n> 8001352 | | Toxaphene; see Chlorinated camphene\n\nSource: \n", "cas_number": "8001352", "file": "toxaphene-see-chlorinated-camphene.md", "generated": true, "harvested": "2026-08-05", "id": "toxaphene-see-chlorinated-camphene", "source_quote": "8001352 | | Toxaphene; see Chlorinated camphene", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Toxaphene; see Chlorinated camphene", "title": "Toxaphene; see Chlorinated camphene \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Tpp; see Triphenyl phosphate\n\n**CAS No.:** 115866\n\n> 115866 | | Tpp; see Triphenyl phosphate\n\nSource: \n", "cas_number": "115866", "file": "tpp-see-triphenyl-phosphate.md", "generated": true, "harvested": "2026-08-05", "id": "tpp-see-triphenyl-phosphate", "source_quote": "115866 | | Tpp; see Triphenyl phosphate", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Tpp; see Triphenyl phosphate", "title": "Tpp; see Triphenyl phosphate \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Tribromomethane; see Bromoform\n\n**CAS No.:** 75252\n\n> 75252 | | Tribromomethane; see Bromoform\n\nSource: \n", "cas_number": "75252", "file": "tribromomethane-see-bromoform.md", "generated": true, "harvested": "2026-08-05", "id": "tribromomethane-see-bromoform", "source_quote": "75252 | | Tribromomethane; see Bromoform", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Tribromomethane; see Bromoform", "title": "Tribromomethane; see Bromoform \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Tributyl phosphate\n\n**CAS No.:** 126738\n\n**PEL (ppm):** 0.2\n\n**PEL (mg/m\u00b3):** 2.5\n\n> 126738 | | Tributyl phosphate | 0.2 | 2.5\n\nSource: \n", "cas_number": "126738", "file": "tributyl-phosphate-2.md", "generated": true, "harvested": "2026-08-05", "id": "tributyl-phosphate-2", "pel_mgm3": "2.5", "pel_ppm": "0.2", "source_quote": "126738 | | Tributyl phosphate | 0.2 | 2.5", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Tributyl phosphate", "title": "Tributyl phosphate \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Tributyl phosphate\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Tributyl phosphate\n\n**CAS No.:** 126-73-8\n\n> CAS No. 126-73-8\n\n**NIOSH REL (ppm):** TWA 0.2\n\n**NIOSH REL (mg/m\u00b3):** 2.5\n\n> NIOSH REL TWA 0.2 ppm (2.5 mg/m3)\n\nSource: \n", "cas_number": "126-73-8", "file": "tributyl-phosphate-3.md", "generated": true, "harvested": "2026-09-08", "id": "tributyl-phosphate-3", "quote_cas_number": "CAS No. 126-73-8", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Tributyl phosphate", "rel_mgm3": "2.5", "rel_ppm": "TWA 0.2", "source_quote": "NIOSH REL TWA 0.2 ppm (2.5 mg/m3)", "sources": ["https://www.cdc.gov/niosh/npg/npgd0625.html"], "stale_after": "2027-09-08", "substance": "Tributyl phosphate", "title": "Tributyl phosphate \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Tributyl phosphate\n\n**CAS No.:** 126-73-8\n\n**PEL (mg/m\u00b3):** 5\n\n> Tributyl phosphate | 126-73-8 | - | 5 | - |\n\nSource: \n", "cas_number": "126-73-8", "file": "tributyl-phosphate.md", "generated": true, "harvested": "2026-08-05", "id": "tributyl-phosphate", "pel_mgm3": "5", "source_quote": "Tributyl phosphate | 126-73-8 | - | 5 | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Tributyl phosphate", "title": "Tributyl phosphate \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Trichloroacetic acid\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Trichloroacetic acid\n\n**CAS No.:** 76-03-9\n\n> CAS No. 76-03-9\n\n**NIOSH REL (ppm):** TWA 1\n\n**NIOSH REL (mg/m\u00b3):** 7\n\n> NIOSH REL TWA 1 ppm (7 mg/m3)\n\nSource: \n", "cas_number": "76-03-9", "file": "trichloroacetic-acid-2.md", "generated": true, "harvested": "2026-09-08", "id": "trichloroacetic-acid-2", "quote_cas_number": "CAS No. 76-03-9", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Trichloroacetic acid", "rel_mgm3": "7", "rel_ppm": "TWA 1", "source_quote": "NIOSH REL TWA 1 ppm (7 mg/m3)", "sources": ["https://www.cdc.gov/niosh/npg/npgd0626.html"], "stale_after": "2027-09-08", "substance": "Trichloroacetic acid", "title": "Trichloroacetic acid \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Trichloroacetic acid\n\n**CAS No.:** 76039\n\n**PEL (ppm):** 1\n\n**PEL (mg/m\u00b3):** 5\n\n> 76039 | | Trichloroacetic acid | 1 | 5\n\nSource: \n", "cas_number": "76039", "file": "trichloroacetic-acid.md", "generated": true, "harvested": "2026-08-05", "id": "trichloroacetic-acid", "pel_mgm3": "5", "pel_ppm": "1", "source_quote": "76039 | | Trichloroacetic acid | 1 | 5", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Trichloroacetic acid", "title": "Trichloroacetic acid \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Trichloroethylene\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Trichloroethylene\n\n**CAS No.:** 79-01-6\n\n> CAS No. 79-01-6\n\n**NIOSH REL, as stated:** Ca See Appendix A See Appendix C\n\n> NIOSH REL Ca See Appendix A See Appendix C\n\nSource: \n", "cas_number": "79-01-6", "file": "trichloroethylene-2.md", "generated": true, "harvested": "2026-09-08", "id": "trichloroethylene-2", "quote_cas_number": "CAS No. 79-01-6", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Trichloroethylene", "rel_statement": "Ca See Appendix A See Appendix C", "source_quote": "NIOSH REL Ca See Appendix A See Appendix C", "sources": ["https://www.cdc.gov/niosh/npg/npgd0629.html"], "stale_after": "2027-09-08", "substance": "Trichloroethylene", "title": "Trichloroethylene \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Trichloroethylene; trichloro-ethene\n\n**CAS No.:** 79016\n\n**PEL (ppm):** 25\n\n**PEL (mg/m\u00b3):** 135\n\n**Ceiling:** 300 ppm\n\n**STEL (ppm):** 100\n\n**STEL (mg/m\u00b3):** 537\n\n> 79016 | | Trichloroethylene; trichloro-ethene | 25 | 135 | 300 ppm | 100 | 537\n\nSource: \n", "cas_number": "79016", "ceiling": "300 ppm", "file": "trichloroethylene-trichloro-ethene.md", "generated": true, "harvested": "2026-08-05", "id": "trichloroethylene-trichloro-ethene", "pel_mgm3": "135", "pel_ppm": "25", "source_quote": "79016 | | Trichloroethylene; trichloro-ethene | 25 | 135 | 300 ppm | 100 | 537", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "stel_mgm3": "537", "stel_ppm": "100", "substance": "Trichloroethylene; trichloro-ethene", "title": "Trichloroethylene; trichloro-ethene \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Trichloroethylene\n\n**CAS No.:** 79-01-6\n\n> Trichloroethylene | 79-01-6 | - | (2) | - |\n\nSource: \n", "cas_number": "79-01-6", "file": "trichloroethylene.md", "generated": true, "harvested": "2026-08-05", "id": "trichloroethylene", "source_quote": "Trichloroethylene | 79-01-6 | - | (2) | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Trichloroethylene", "title": "Trichloroethylene \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Trichlorofluoromethane; Fluorocarbon 11\n\n**CAS No.:** 75694\n\n**PEL (ppm):** 1,000\n\n**PEL (mg/m\u00b3):** 5,600\n\n**Ceiling:** C\n\n> 75694 | | Trichlorofluoromethane; Fluorocarbon 11 | 1,000 | 5,600 | C\n\nSource: \n", "cas_number": "75694", "ceiling": "C", "file": "trichlorofluoromethane-fluorocarbon-11.md", "generated": true, "harvested": "2026-08-05", "id": "trichlorofluoromethane-fluorocarbon-11", "pel_mgm3": "5,600", "pel_ppm": "1,000", "source_quote": "75694 | | Trichlorofluoromethane; Fluorocarbon 11 | 1,000 | 5,600 | C", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Trichlorofluoromethane; Fluorocarbon 11", "title": "Trichlorofluoromethane; Fluorocarbon 11 \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Trichloromethane; see Chloroform\n\n**CAS No.:** 67663\n\n> 67663 | | Trichloromethane; see Chloroform\n\nSource: \n", "cas_number": "67663", "file": "trichloromethane-see-chloroform.md", "generated": true, "harvested": "2026-08-05", "id": "trichloromethane-see-chloroform", "source_quote": "67663 | | Trichloromethane; see Chloroform", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Trichloromethane; see Chloroform", "title": "Trichloromethane; see Chloroform \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Trichloromethanethiol; see Perchloromethyl mercaptan\n\n**CAS No.:** 594423\n\n> 594423 | | Trichloromethanethiol; see Perchloromethyl mercaptan\n\nSource: \n", "cas_number": "594423", "file": "trichloromethanethiol-see-perchloromethyl-mercaptan.md", "generated": true, "harvested": "2026-08-05", "id": "trichloromethanethiol-see-perchloromethyl-mercaptan", "source_quote": "594423 | | Trichloromethanethiol; see Perchloromethyl mercaptan", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Trichloromethanethiol; see Perchloromethyl mercaptan", "title": "Trichloromethanethiol; see Perchloromethyl mercaptan \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Trichloronaphthalene\n\n**CAS No.:** 1321659\n\n**PEL (mg/m\u00b3):** 5\n\n> 1321659 | S | Trichloronaphthalene | -- | 5\n\nSource: \n", "cas_number": "1321659", "file": "trichloronaphthalene-2.md", "generated": true, "harvested": "2026-08-05", "id": "trichloronaphthalene-2", "pel_mgm3": "5", "source_quote": "1321659 | S | Trichloronaphthalene | -- | 5", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Trichloronaphthalene", "title": "Trichloronaphthalene \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Trichloronaphthalene\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Trichloronaphthalene\n\n**CAS No.:** 1321-65-9\n\n> CAS No. 1321-65-9\n\n**NIOSH REL (mg/m\u00b3):** TWA 5\n\n> NIOSH REL TWA 5 mg/m3 [skin]\n\nSource: \n", "cas_number": "1321-65-9", "file": "trichloronaphthalene-3.md", "generated": true, "harvested": "2026-09-08", "id": "trichloronaphthalene-3", "quote_cas_number": "CAS No. 1321-65-9", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Trichloronaphthalene", "rel_mgm3": "TWA 5", "source_quote": "NIOSH REL TWA 5 mg/m3 [skin]", "sources": ["https://www.cdc.gov/niosh/npg/npgd0630.html"], "stale_after": "2027-09-08", "substance": "Trichloronaphthalene", "title": "Trichloronaphthalene \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Trichloronaphthalene\n\n**CAS No.:** 1321-65-9\n\n**PEL (mg/m\u00b3):** 5\n\n> Trichloronaphthalene | 1321-65-9 | - | 5 | X |\n\nSource: \n", "cas_number": "1321-65-9", "file": "trichloronaphthalene.md", "generated": true, "harvested": "2026-08-05", "id": "trichloronaphthalene", "pel_mgm3": "5", "source_quote": "Trichloronaphthalene | 1321-65-9 | - | 5 | X |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Trichloronaphthalene", "title": "Trichloronaphthalene \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Trichloronitromethane; see Chloropicrin\n\n**CAS No.:** 76062\n\n> 76062 | | Trichloronitromethane; see Chloropicrin\n\nSource: \n", "cas_number": "76062", "file": "trichloronitromethane-see-chloropicrin.md", "generated": true, "harvested": "2026-08-05", "id": "trichloronitromethane-see-chloropicrin", "source_quote": "76062 | | Trichloronitromethane; see Chloropicrin", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Trichloronitromethane; see Chloropicrin", "title": "Trichloronitromethane; see Chloropicrin \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Tricresyl phosphate; see Triorthocresyl phosphate\n\n**CAS No.:** 78308\n\n> 78308 | | Tricresyl phosphate; see Triorthocresyl phosphate\n\nSource: \n", "cas_number": "78308", "file": "tricresyl-phosphate-see-triorthocresyl-phosphate.md", "generated": true, "harvested": "2026-08-05", "id": "tricresyl-phosphate-see-triorthocresyl-phosphate", "source_quote": "78308 | | Tricresyl phosphate; see Triorthocresyl phosphate", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Tricresyl phosphate; see Triorthocresyl phosphate", "title": "Tricresyl phosphate; see Triorthocresyl phosphate \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Tricyclohexyltin hydroxide; see Cyhexatin\n\n**CAS No.:** 13121705\n\n> 13121705 | | Tricyclohexyltin hydroxide; see Cyhexatin\n\nSource: \n", "cas_number": "13121705", "file": "tricyclohexyltin-hydroxide-see-cyhexatin.md", "generated": true, "harvested": "2026-08-05", "id": "tricyclohexyltin-hydroxide-see-cyhexatin", "source_quote": "13121705 | | Tricyclohexyltin hydroxide; see Cyhexatin", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Tricyclohexyltin hydroxide; see Cyhexatin", "title": "Tricyclohexyltin hydroxide; see Cyhexatin \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Tridymite; see 1910.1053 7\n\n**CAS No.:** 15468-32-3\n\n> Tridymite; see 1910.1053 7 | 15468-32-3 | - | - | - |\n\nSource: \n", "cas_number": "15468-32-3", "file": "tridymite-see-1910-1053-7.md", "generated": true, "harvested": "2026-08-05", "id": "tridymite-see-1910-1053-7", "source_quote": "Tridymite; see 1910.1053 7 | 15468-32-3 | - | - | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Tridymite; see 1910.1053 7", "title": "Tridymite; see 1910.1053 7 \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Tridymite,\n\n**CAS No.:** 15468323\n\n**PEL (mg/m\u00b3):** 0.05\n\n> 15468323 | | Tridymite, | -- | 0.05\n\nSource: \n", "cas_number": "15468323", "file": "tridymite.md", "generated": true, "harvested": "2026-08-05", "id": "tridymite", "pel_mgm3": "0.05", "source_quote": "15468323 | | Tridymite, | -- | 0.05", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Tridymite,", "title": "Tridymite, \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Triethanolamine\n\n**CAS No.:** 102716\n\n**PEL (mg/m\u00b3):** 5\n\n> 102716 | | Triethanolamine | -- | 5\n\nSource: \n", "cas_number": "102716", "file": "triethanolamine.md", "generated": true, "harvested": "2026-08-05", "id": "triethanolamine", "pel_mgm3": "5", "source_quote": "102716 | | Triethanolamine | -- | 5", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Triethanolamine", "title": "Triethanolamine \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Triethylamine\n\n**CAS No.:** 121448\n\n**PEL (ppm):** 1\n\n**PEL (mg/m\u00b3):** 4.1\n\n**Ceiling:** C\n\n> 121448 | S | Triethylamine | 1 | 4.1 | C\n\nSource: \n", "cas_number": "121448", "ceiling": "C", "file": "triethylamine-2.md", "generated": true, "harvested": "2026-08-05", "id": "triethylamine-2", "pel_mgm3": "4.1", "pel_ppm": "1", "source_quote": "121448 | S | Triethylamine | 1 | 4.1 | C", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Triethylamine", "title": "Triethylamine \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Triethylamine\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Triethylamine\n\n**CAS No.:** 121-44-8\n\n> CAS No. 121-44-8\n\n**NIOSH REL, as stated:** See Appendix D\n\n> NIOSH REL See Appendix D\n\nSource: \n", "cas_number": "121-44-8", "file": "triethylamine-3.md", "generated": true, "harvested": "2026-09-08", "id": "triethylamine-3", "quote_cas_number": "CAS No. 121-44-8", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Triethylamine", "rel_statement": "See Appendix D", "source_quote": "NIOSH REL See Appendix D", "sources": ["https://www.cdc.gov/niosh/npg/npgd0633.html"], "stale_after": "2027-09-08", "substance": "Triethylamine", "title": "Triethylamine \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Triethylamine\n\n**CAS No.:** 121-44-8\n\n**PEL (ppm):** 25\n\n**PEL (mg/m\u00b3):** 100\n\n> Triethylamine | 121-44-8 | 25 | 100 | - |\n\nSource: \n", "cas_number": "121-44-8", "file": "triethylamine.md", "generated": true, "harvested": "2026-08-05", "id": "triethylamine", "pel_mgm3": "100", "pel_ppm": "25", "source_quote": "Triethylamine | 121-44-8 | 25 | 100 | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Triethylamine", "title": "Triethylamine \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Triethylene glycol dimethyl ether, Triglyme\n\n**CAS No.:** 112492\n\n**PEL (ppm):** 5\n\n**PEL (mg/m\u00b3):** 36\n\n> 112492 | S | Triethylene glycol dimethyl ether, Triglyme | 5 | 36\n\nSource: \n", "cas_number": "112492", "file": "triethylene-glycol-dimethyl-ether-triglyme.md", "generated": true, "harvested": "2026-08-05", "id": "triethylene-glycol-dimethyl-ether-triglyme", "pel_mgm3": "36", "pel_ppm": "5", "source_quote": "112492 | S | Triethylene glycol dimethyl ether, Triglyme | 5 | 36", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Triethylene glycol dimethyl ether, Triglyme", "title": "Triethylene glycol dimethyl ether, Triglyme \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Trifluorobromomethane\n\n**CAS No.:** 75638\n\n**PEL (ppm):** 1,000\n\n**PEL (mg/m\u00b3):** 6,100\n\n> 75638 | | Trifluorobromomethane | 1,000 | 6,100\n\nSource: \n", "cas_number": "75638", "file": "trifluorobromomethane-2.md", "generated": true, "harvested": "2026-08-05", "id": "trifluorobromomethane-2", "pel_mgm3": "6,100", "pel_ppm": "1,000", "source_quote": "75638 | | Trifluorobromomethane | 1,000 | 6,100", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Trifluorobromomethane", "title": "Trifluorobromomethane \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Trifluorobromomethane\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Trifluorobromomethane\n\n**CAS No.:** 75-63-8\n\n> CAS No. 75-63-8\n\n**NIOSH REL (ppm):** TWA 1000\n\n**NIOSH REL (mg/m\u00b3):** 6100\n\n> NIOSH REL TWA 1000 ppm (6100 mg/m3)\n\nSource: \n", "cas_number": "75-63-8", "file": "trifluorobromomethane-3.md", "generated": true, "harvested": "2026-09-08", "id": "trifluorobromomethane-3", "quote_cas_number": "CAS No. 75-63-8", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Trifluorobromomethane", "rel_mgm3": "6100", "rel_ppm": "TWA 1000", "source_quote": "NIOSH REL TWA 1000 ppm (6100 mg/m3)", "sources": ["https://www.cdc.gov/niosh/npg/npgd0634.html"], "stale_after": "2027-09-08", "substance": "Trifluorobromomethane", "title": "Trifluorobromomethane \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Trifluorobromomethane\n\n**CAS No.:** 75-63-8\n\n**PEL (ppm):** 1000\n\n**PEL (mg/m\u00b3):** 6100\n\n> Trifluorobromomethane | 75-63-8 | 1000 | 6100 | - |\n\nSource: \n", "cas_number": "75-63-8", "file": "trifluorobromomethane.md", "generated": true, "harvested": "2026-08-05", "id": "trifluorobromomethane", "pel_mgm3": "6100", "pel_ppm": "1000", "source_quote": "Trifluorobromomethane | 75-63-8 | 1000 | 6100 | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Trifluorobromomethane", "title": "Trifluorobromomethane \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Trimellitic anhydride\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Trimellitic anhydride\n\n**CAS No.:** 552-30-7\n\n> CAS No. 552-30-7\n\n**NIOSH REL (ppm):** TWA 0.005\n\n**NIOSH REL (mg/m\u00b3):** 0.04\n\n> NIOSH REL TWA 0.005 ppm (0.04 mg/m3) Should be handled in the workplace as an extremely toxic substance\n\nSource: \n", "cas_number": "552-30-7", "file": "trimellitic-anhydride-2.md", "generated": true, "harvested": "2026-09-08", "id": "trimellitic-anhydride-2", "quote_cas_number": "CAS No. 552-30-7", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Trimellitic anhydride", "rel_mgm3": "0.04", "rel_ppm": "TWA 0.005", "source_quote": "NIOSH REL TWA 0.005 ppm (0.04 mg/m3) Should be handled in the workplace as an extremely toxic substance", "sources": ["https://www.cdc.gov/niosh/npg/npgd0635.html"], "stale_after": "2027-09-08", "substance": "Trimellitic anhydride", "title": "Trimellitic anhydride \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Trimellitic anhydride\n\n**CAS No.:** 552307\n\n**PEL (ppm):** 0.005\n\n**PEL (mg/m\u00b3):** 0.04\n\n**Ceiling:** C\n\n> 552307 | | Trimellitic anhydride | 0.005 | 0.04 | C\n\nSource: \n", "cas_number": "552307", "ceiling": "C", "file": "trimellitic-anhydride.md", "generated": true, "harvested": "2026-08-05", "id": "trimellitic-anhydride", "pel_mgm3": "0.04", "pel_ppm": "0.005", "source_quote": "552307 | | Trimellitic anhydride | 0.005 | 0.04 | C", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Trimellitic anhydride", "title": "Trimellitic anhydride \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Trimethyl phosphite\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Trimethyl phosphite\n\n**CAS No.:** 121-45-9\n\n> CAS No. 121-45-9\n\n**NIOSH REL (ppm):** TWA 2\n\n**NIOSH REL (mg/m\u00b3):** 10\n\n> NIOSH REL TWA 2 ppm (10 mg/m3)\n\nSource: \n", "cas_number": "121-45-9", "file": "trimethyl-phosphite-2.md", "generated": true, "harvested": "2026-09-08", "id": "trimethyl-phosphite-2", "quote_cas_number": "CAS No. 121-45-9", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Trimethyl phosphite", "rel_mgm3": "10", "rel_ppm": "TWA 2", "source_quote": "NIOSH REL TWA 2 ppm (10 mg/m3)", "sources": ["https://www.cdc.gov/niosh/npg/npgd0640.html"], "stale_after": "2027-09-08", "substance": "Trimethyl phosphite", "title": "Trimethyl phosphite \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Trimethyl phosphite\n\n**CAS No.:** 121459\n\n**PEL (ppm):** 2\n\n**PEL (mg/m\u00b3):** 10\n\n> 121459 | | Trimethyl phosphite | 2 | 10\n\nSource: \n", "cas_number": "121459", "file": "trimethyl-phosphite.md", "generated": true, "harvested": "2026-08-05", "id": "trimethyl-phosphite", "pel_mgm3": "10", "pel_ppm": "2", "source_quote": "121459 | | Trimethyl phosphite | 2 | 10", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Trimethyl phosphite", "title": "Trimethyl phosphite \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Trimethylamine\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Trimethylamine\n\n**CAS No.:** 75-50-3\n\n> CAS No. 75-50-3\n\n**NIOSH REL (ppm):** TWA 10\n\n**NIOSH REL (mg/m\u00b3):** 24\n\n> NIOSH REL TWA 10 ppm (24 mg/m3) ST 15 ppm (36 mg/m3)\n\nSource: \n", "cas_number": "75-50-3", "file": "trimethylamine-2.md", "generated": true, "harvested": "2026-09-08", "id": "trimethylamine-2", "quote_cas_number": "CAS No. 75-50-3", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Trimethylamine", "rel_mgm3": "24", "rel_ppm": "TWA 10", "source_quote": "NIOSH REL TWA 10 ppm (24 mg/m3) ST 15 ppm (36 mg/m3)", "sources": ["https://www.cdc.gov/niosh/npg/npgd0636.html"], "stale_after": "2027-09-08", "substance": "Trimethylamine", "title": "Trimethylamine \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Trimethylamine\n\n**CAS No.:** 75503\n\n**PEL (ppm):** 5\n\n**PEL (mg/m\u00b3):** 12\n\n**STEL (ppm):** 15\n\n**STEL (mg/m\u00b3):** 36\n\n> 75503 | | Trimethylamine | 5 | 12 | | 15 | 36\n\nSource: \n", "cas_number": "75503", "file": "trimethylamine.md", "generated": true, "harvested": "2026-08-05", "id": "trimethylamine", "pel_mgm3": "12", "pel_ppm": "5", "source_quote": "75503 | | Trimethylamine | 5 | 12 | | 15 | 36", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "stel_mgm3": "36", "stel_ppm": "15", "substance": "Trimethylamine", "title": "Trimethylamine \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Triorthocresyl phosphate\n\n**CAS No.:** 78308\n\n**PEL (mg/m\u00b3):** 0.1\n\n> 78308 | S | Triorthocresyl phosphate | -- | 0.1\n\nSource: \n", "cas_number": "78308", "file": "triorthocresyl-phosphate-2.md", "generated": true, "harvested": "2026-08-05", "id": "triorthocresyl-phosphate-2", "pel_mgm3": "0.1", "source_quote": "78308 | S | Triorthocresyl phosphate | -- | 0.1", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Triorthocresyl phosphate", "title": "Triorthocresyl phosphate \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Triorthocresyl phosphate\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Triorthocresyl phosphate\n\n**CAS No.:** 78-30-8\n\n> CAS No. 78-30-8\n\n**NIOSH REL (mg/m\u00b3):** TWA 0.1\n\n> NIOSH REL TWA 0.1 mg/m3 [skin]\n\nSource: \n", "cas_number": "78-30-8", "file": "triorthocresyl-phosphate-3.md", "generated": true, "harvested": "2026-09-08", "id": "triorthocresyl-phosphate-3", "quote_cas_number": "CAS No. 78-30-8", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Triorthocresyl phosphate", "rel_mgm3": "TWA 0.1", "source_quote": "NIOSH REL TWA 0.1 mg/m3 [skin]", "sources": ["https://www.cdc.gov/niosh/npg/npgd0642.html"], "stale_after": "2027-09-08", "substance": "Triorthocresyl phosphate", "title": "Triorthocresyl phosphate \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Triorthocresyl phosphate\n\n**CAS No.:** 78-30-8\n\n**PEL (mg/m\u00b3):** 0.1\n\n> Triorthocresyl phosphate | 78-30-8 | - | 0.1 | - |\n\nSource: \n", "cas_number": "78-30-8", "file": "triorthocresyl-phosphate.md", "generated": true, "harvested": "2026-08-05", "id": "triorthocresyl-phosphate", "pel_mgm3": "0.1", "source_quote": "Triorthocresyl phosphate | 78-30-8 | - | 0.1 | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Triorthocresyl phosphate", "title": "Triorthocresyl phosphate \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Triphenyl phosphate\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Triphenyl phosphate\n\n**CAS No.:** 115-86-6\n\n> CAS No. 115-86-6\n\n**NIOSH REL (mg/m\u00b3):** TWA 3\n\n> NIOSH REL TWA 3 mg/m3\n\nSource: \n", "cas_number": "115-86-6", "file": "triphenyl-phosphate-2.md", "generated": true, "harvested": "2026-09-08", "id": "triphenyl-phosphate-2", "quote_cas_number": "CAS No. 115-86-6", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Triphenyl phosphate", "rel_mgm3": "TWA 3", "source_quote": "NIOSH REL TWA 3 mg/m3", "sources": ["https://www.cdc.gov/niosh/npg/npgd0644.html"], "stale_after": "2027-09-08", "substance": "Triphenyl phosphate", "title": "Triphenyl phosphate \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Triphenyl phosphate; TPP\n\n**CAS No.:** 115866\n\n**PEL (mg/m\u00b3):** 3\n\n> 115866 | S | Triphenyl phosphate; TPP | -- | 3\n\nSource: \n", "cas_number": "115866", "file": "triphenyl-phosphate-tpp.md", "generated": true, "harvested": "2026-08-05", "id": "triphenyl-phosphate-tpp", "pel_mgm3": "3", "source_quote": "115866 | S | Triphenyl phosphate; TPP | -- | 3", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Triphenyl phosphate; TPP", "title": "Triphenyl phosphate; TPP \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Triphenyl phosphate\n\n**CAS No.:** 115-86-6\n\n**PEL (mg/m\u00b3):** 3\n\n> Triphenyl phosphate | 115-86-6 | - | 3 | - |\n\nSource: \n", "cas_number": "115-86-6", "file": "triphenyl-phosphate.md", "generated": true, "harvested": "2026-08-05", "id": "triphenyl-phosphate", "pel_mgm3": "3", "source_quote": "Triphenyl phosphate | 115-86-6 | - | 3 | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Triphenyl phosphate", "title": "Triphenyl phosphate \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Triphenylamine\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Triphenylamine\n\n**CAS No.:** 603-34-9\n\n> CAS No. 603-34-9\n\n**NIOSH REL (mg/m\u00b3):** TWA 5\n\n> NIOSH REL TWA 5 mg/m3\n\nSource: \n", "cas_number": "603-34-9", "file": "triphenylamine-2.md", "generated": true, "harvested": "2026-09-08", "id": "triphenylamine-2", "quote_cas_number": "CAS No. 603-34-9", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Triphenylamine", "rel_mgm3": "TWA 5", "source_quote": "NIOSH REL TWA 5 mg/m3", "sources": ["https://www.cdc.gov/niosh/npg/npgd0643.html"], "stale_after": "2027-09-08", "substance": "Triphenylamine", "title": "Triphenylamine \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Triphenylamine\n\n**CAS No.:** 603349\n\n**PEL (mg/m\u00b3):** 5\n\n> 603349 | | Triphenylamine | -- | 5\n\nSource: \n", "cas_number": "603349", "file": "triphenylamine.md", "generated": true, "harvested": "2026-08-05", "id": "triphenylamine", "pel_mgm3": "5", "source_quote": "603349 | | Triphenylamine | -- | 5", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Triphenylamine", "title": "Triphenylamine \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Tripoli (as quartz); see 1910.1053 7\n\n**CAS No.:** 1317-95-9\n\n> Tripoli (as quartz); see 1910.1053 7 | 1317-95-9 | - | - | - |\n\nSource: \n", "cas_number": "1317-95-9", "file": "tripoli-as-quartz-see-1910-1053-7.md", "generated": true, "harvested": "2026-08-05", "id": "tripoli-as-quartz-see-1910-1053-7", "source_quote": "Tripoli (as quartz); see 1910.1053 7 | 1317-95-9 | - | - | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Tripoli (as quartz); see 1910.1053 7", "title": "Tripoli (as quartz); see 1910.1053 7 \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Tripoli, (as quartz)\n\n**CAS No.:** 1317959\n\n**PEL (mg/m\u00b3):** 0.05\n\n> 1317959 | | Tripoli, (as quartz) | -- | 0.05\n\nSource: \n", "cas_number": "1317959", "file": "tripoli-as-quartz.md", "generated": true, "harvested": "2026-08-05", "id": "tripoli-as-quartz", "pel_mgm3": "0.05", "source_quote": "1317959 | | Tripoli, (as quartz) | -- | 0.05", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Tripoli, (as quartz)", "title": "Tripoli, (as quartz) \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Tungsten carbide (cemented)\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Tungsten carbide (cemented)\n\n**CAS No.:** 1: 11107-01-0 2: 12718-69-3 3: 37329-49-0\n\n> CAS No. 1: 11107-01-0 2: 12718-69-3 3: 37329-49-0\n\n**NIOSH REL, as stated:** See Appendix C\n\n> NIOSH REL See Appendix C\n\nSource: \n", "cas_number": "1: 11107-01-0 2: 12718-69-3 3: 37329-49-0", "file": "tungsten-carbide-cemented.md", "generated": true, "harvested": "2026-09-08", "id": "tungsten-carbide-cemented", "quote_cas_number": "CAS No. 1: 11107-01-0 2: 12718-69-3 3: 37329-49-0", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Tungsten carbide (cemented)", "rel_statement": "See Appendix C", "source_quote": "NIOSH REL See Appendix C", "sources": ["https://www.cdc.gov/niosh/npg/npgd0647.html"], "stale_after": "2027-09-08", "substance": "Tungsten carbide (cemented)", "title": "Tungsten carbide (cemented) \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Tungsten metal, as W\n\n**CAS No.:** 7440337\n\n**PEL (mg/m\u00b3):** 5\n\n> 7440337 | | Tungsten metal, as W | -- | 5\n\nSource: \n", "cas_number": "7440337", "file": "tungsten-metal-as-w.md", "generated": true, "harvested": "2026-08-05", "id": "tungsten-metal-as-w", "pel_mgm3": "5", "source_quote": "7440337 | | Tungsten metal, as W | -- | 5", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Tungsten metal, as W", "title": "Tungsten metal, as W \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Tungsten\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Tungsten\n\n**CAS No.:** 7440-33-7\n\n> CAS No. 7440-33-7\n\n**NIOSH REL (mg/m\u00b3):** TWA 5\n\n> NIOSH REL TWA 5 mg/m3 ST 10 mg/m3\n\nSource: \n", "cas_number": "7440-33-7", "file": "tungsten.md", "generated": true, "harvested": "2026-09-08", "id": "tungsten", "quote_cas_number": "CAS No. 7440-33-7", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Tungsten", "rel_mgm3": "TWA 5", "source_quote": "NIOSH REL TWA 5 mg/m3 ST 10 mg/m3", "sources": ["https://www.cdc.gov/niosh/npg/npgd0645.html"], "stale_after": "2027-09-08", "substance": "Tungsten", "title": "Tungsten \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Turpentine\n\n**CAS No.:** 8006642\n\n**PEL (ppm):** 100\n\n**PEL (mg/m\u00b3):** 560\n\n> 8006642 | | Turpentine | 100 | 560\n\nSource: \n", "cas_number": "8006642", "file": "turpentine-2.md", "generated": true, "harvested": "2026-08-05", "id": "turpentine-2", "pel_mgm3": "560", "pel_ppm": "100", "source_quote": "8006642 | | Turpentine | 100 | 560", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Turpentine", "title": "Turpentine \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Turpentine\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Turpentine\n\n**CAS No.:** 8006-64-2\n\n> CAS No. 8006-64-2\n\n**NIOSH REL (ppm):** TWA 100\n\n**NIOSH REL (mg/m\u00b3):** 560\n\n> NIOSH REL TWA 100 ppm (560 mg/m3)\n\nSource: \n", "cas_number": "8006-64-2", "file": "turpentine-3.md", "generated": true, "harvested": "2026-09-08", "id": "turpentine-3", "quote_cas_number": "CAS No. 8006-64-2", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Turpentine", "rel_mgm3": "560", "rel_ppm": "TWA 100", "source_quote": "NIOSH REL TWA 100 ppm (560 mg/m3)", "sources": ["https://www.cdc.gov/niosh/npg/npgd0648.html"], "stale_after": "2027-09-08", "substance": "Turpentine", "title": "Turpentine \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Turpentine\n\n**CAS No.:** 8006-64-2\n\n**PEL (ppm):** 100\n\n**PEL (mg/m\u00b3):** 560\n\n> Turpentine | 8006-64-2 | 100 | 560 | - |\n\nSource: \n", "cas_number": "8006-64-2", "file": "turpentine.md", "generated": true, "harvested": "2026-08-05", "id": "turpentine", "pel_mgm3": "560", "pel_ppm": "100", "source_quote": "Turpentine | 8006-64-2 | 100 | 560 | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Turpentine", "title": "Turpentine \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Uranium (as U)\n\n**CAS No.:** 7440-61-1\n\n> Uranium (as U) | 7440-61-1 | - | - | - |\n\nSource: \n", "cas_number": "7440-61-1", "file": "uranium-as-u.md", "generated": true, "harvested": "2026-08-05", "id": "uranium-as-u", "source_quote": "Uranium (as U) | 7440-61-1 | - | - | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Uranium (as U)", "title": "Uranium (as U) \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Uranium (insoluble compounds, as U)\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Uranium (insoluble compounds, as U)\n\n**CAS No.:** 7440-61-1 (metal)\n\n> CAS No. 7440-61-1 (metal)\n\n**NIOSH REL (mg/m\u00b3):** TWA 0.2\n\n> NIOSH REL Ca TWA 0.2 mg/m3 ST 0.6 mg/m3\n\nSource: \n", "cas_number": "7440-61-1 (metal)", "file": "uranium-insoluble-compounds-as-u.md", "generated": true, "harvested": "2026-09-08", "id": "uranium-insoluble-compounds-as-u", "quote_cas_number": "CAS No. 7440-61-1 (metal)", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Uranium (insoluble compounds, as U)", "rel_mgm3": "TWA 0.2", "source_quote": "NIOSH REL Ca TWA 0.2 mg/m3 ST 0.6 mg/m3", "sources": ["https://www.cdc.gov/niosh/npg/npgd0650.html"], "stale_after": "2027-09-08", "substance": "Uranium (insoluble compounds, as U)", "title": "Uranium (insoluble compounds, as U) \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Valeraldehyde\n\n**CAS No.:** 110623\n\n**PEL (ppm):** 50\n\n**PEL (mg/m\u00b3):** 175\n\n> 110623 | | Valeraldehyde | 50 | 175\n\nSource: \n", "cas_number": "110623", "file": "valeraldehyde.md", "generated": true, "harvested": "2026-08-05", "id": "valeraldehyde", "pel_mgm3": "175", "pel_ppm": "50", "source_quote": "110623 | | Valeraldehyde | 50 | 175", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Valeraldehyde", "title": "Valeraldehyde \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Vanadium dust\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Vanadium dust\n\n**CAS No.:** 1314-62-1\n\n> CAS No. 1314-62-1\n\n**NIOSH REL, as stated:** C 0.05 mg V/m3 [15-minute]\n\n> NIOSH REL C 0.05 mg V/m3 [15-minute]\n\nSource: \n", "cas_number": "1314-62-1", "file": "vanadium-dust.md", "generated": true, "harvested": "2026-09-08", "id": "vanadium-dust", "quote_cas_number": "CAS No. 1314-62-1", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Vanadium dust", "rel_statement": "C 0.05 mg V/m3 [15-minute]", "source_quote": "NIOSH REL C 0.05 mg V/m3 [15-minute]", "sources": ["https://www.cdc.gov/niosh/npg/npgd0653.html"], "stale_after": "2027-09-08", "substance": "Vanadium dust", "title": "Vanadium dust \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Vanadium fume\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Vanadium fume\n\n**CAS No.:** 1314-62-1\n\n> CAS No. 1314-62-1\n\n**NIOSH REL, as stated:** C 0.05 mg V/m3 [15-minute]\n\n> NIOSH REL C 0.05 mg V/m3 [15-minute]\n\nSource: \n", "cas_number": "1314-62-1", "file": "vanadium-fume.md", "generated": true, "harvested": "2026-09-08", "id": "vanadium-fume", "quote_cas_number": "CAS No. 1314-62-1", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Vanadium fume", "rel_statement": "C 0.05 mg V/m3 [15-minute]", "source_quote": "NIOSH REL C 0.05 mg V/m3 [15-minute]", "sources": ["https://www.cdc.gov/niosh/npg/npgd0654.html"], "stale_after": "2027-09-08", "substance": "Vanadium fume", "title": "Vanadium fume \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Vanadium pentoxide (V$2O$5), respirable dust and fume\n\n**CAS No.:** 1314621\n\n**PEL (mg/m\u00b3):** 0.05\n\n> 1314621 | | Vanadium pentoxide (V$2O$5), respirable dust and fume | -- | 0.05\n\nSource: \n", "cas_number": "1314621", "file": "vanadium-pentoxide-v-2-o-5-respirable-dust-and-fume.md", "generated": true, "harvested": "2026-08-05", "id": "vanadium-pentoxide-v-2-o-5-respirable-dust-and-fume", "pel_mgm3": "0.05", "source_quote": "1314621 | | Vanadium pentoxide (V$2O$5), respirable dust and fume | -- | 0.05", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Vanadium pentoxide (V$2O$5), respirable dust and fume", "title": "Vanadium pentoxide (V $2 O $5 ), respirable dust and fume \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Vanadium\n\n**CAS No.:** 1314-62-1\n\n> Vanadium | 1314-62-1 | - | - | - |\n\nSource: \n", "cas_number": "1314-62-1", "file": "vanadium.md", "generated": true, "harvested": "2026-08-05", "id": "vanadium", "source_quote": "Vanadium | 1314-62-1 | - | - | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Vanadium", "title": "Vanadium \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** VC; see Vinyl chloride, Section 5210\n\n**CAS No.:** 75014\n\n> 75014 | S | VC; see Vinyl chloride, Section 5210\n\nSource: \n", "cas_number": "75014", "file": "vc-see-vinyl-chloride-section-5210.md", "generated": true, "harvested": "2026-08-05", "id": "vc-see-vinyl-chloride-section-5210", "source_quote": "75014 | S | VC; see Vinyl chloride, Section 5210", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "VC; see Vinyl chloride, Section 5210", "title": "VC; see Vinyl chloride, Section 5210 \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Vegetable oil mist\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Vegetable oil mist\n\n**CAS No.:** 68956-68-3\n\n> CAS No. 68956-68-3\n\n**NIOSH REL, as stated:** TWA 10 mg/m3 (total) TWA 5 mg/m3 (resp)\n\n> NIOSH REL TWA 10 mg/m3 (total) TWA 5 mg/m3 (resp)\n\nSource: \n", "cas_number": "68956-68-3", "file": "vegetable-oil-mist.md", "generated": true, "harvested": "2026-09-08", "id": "vegetable-oil-mist", "quote_cas_number": "CAS No. 68956-68-3", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Vegetable oil mist", "rel_statement": "TWA 10 mg/m3 (total) TWA 5 mg/m3 (resp)", "source_quote": "NIOSH REL TWA 10 mg/m3 (total) TWA 5 mg/m3 (resp)", "sources": ["https://www.cdc.gov/niosh/npg/npgd0655.html"], "stale_after": "2027-09-08", "substance": "Vegetable oil mist", "title": "Vegetable oil mist \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Vinyl acetate\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Vinyl acetate\n\n**CAS No.:** 108-05-4\n\n> CAS No. 108-05-4\n\n**NIOSH REL (ppm):** C 4\n\n**NIOSH REL (mg/m\u00b3):** 15\n\n> NIOSH REL C 4 ppm (15 mg/m3) [15-minute]\n\nSource: \n", "cas_number": "108-05-4", "file": "vinyl-acetate-2.md", "generated": true, "harvested": "2026-09-08", "id": "vinyl-acetate-2", "quote_cas_number": "CAS No. 108-05-4", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Vinyl acetate", "rel_mgm3": "15", "rel_ppm": "C 4", "source_quote": "NIOSH REL C 4 ppm (15 mg/m3) [15-minute]", "sources": ["https://www.cdc.gov/niosh/npg/npgd0656.html"], "stale_after": "2027-09-08", "substance": "Vinyl acetate", "title": "Vinyl acetate \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Vinyl acetate\n\n**CAS No.:** 108054\n\n**PEL (ppm):** 10\n\n**PEL (mg/m\u00b3):** 30\n\n**STEL (ppm):** 15\n\n**STEL (mg/m\u00b3):** 45\n\n> 108054 | | Vinyl acetate | 10 | 30 | | 15 | 45\n\nSource: \n", "cas_number": "108054", "file": "vinyl-acetate.md", "generated": true, "harvested": "2026-08-05", "id": "vinyl-acetate", "pel_mgm3": "30", "pel_ppm": "10", "source_quote": "108054 | | Vinyl acetate | 10 | 30 | | 15 | 45", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "stel_mgm3": "45", "stel_ppm": "15", "substance": "Vinyl acetate", "title": "Vinyl acetate \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Vinyl bromide; bromoethylene\n\n**CAS No.:** 593602\n\n**PEL (ppm):** 0.1\n\n**PEL (mg/m\u00b3):** 0.44\n\n> 593602 | | Vinyl bromide; bromoethylene | 0.1 | 0.44\n\nSource: \n", "cas_number": "593602", "file": "vinyl-bromide-bromoethylene.md", "generated": true, "harvested": "2026-08-05", "id": "vinyl-bromide-bromoethylene", "pel_mgm3": "0.44", "pel_ppm": "0.1", "source_quote": "593602 | | Vinyl bromide; bromoethylene | 0.1 | 0.44", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Vinyl bromide; bromoethylene", "title": "Vinyl bromide; bromoethylene \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Vinyl bromide\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Vinyl bromide\n\n**CAS No.:** 593-60-2\n\n> CAS No. 593-60-2\n\n**NIOSH REL, as stated:** Ca See Appendix A\n\n> NIOSH REL Ca See Appendix A\n\nSource: \n", "cas_number": "593-60-2", "file": "vinyl-bromide.md", "generated": true, "harvested": "2026-09-08", "id": "vinyl-bromide", "quote_cas_number": "CAS No. 593-60-2", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Vinyl bromide", "rel_statement": "Ca See Appendix A", "source_quote": "NIOSH REL Ca See Appendix A", "sources": ["https://www.cdc.gov/niosh/npg/npgd0657.html"], "stale_after": "2027-09-08", "substance": "Vinyl bromide", "title": "Vinyl bromide \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Vinyl chloride; see 1910.1017\n\n**CAS No.:** 75-01-4\n\n> Vinyl chloride; see 1910.1017 | 75-01-4 | - | - | - |\n\nSource: \n", "cas_number": "75-01-4", "file": "vinyl-chloride-see-1910-1017.md", "generated": true, "harvested": "2026-08-05", "id": "vinyl-chloride-see-1910-1017", "source_quote": "Vinyl chloride; see 1910.1017 | 75-01-4 | - | - | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Vinyl chloride; see 1910.1017", "title": "Vinyl chloride; see 1910.1017 \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Vinyl chloride, see Section 5210\n\n**CAS No.:** 75014\n\n**PEL (ppm):** 1\n\n> 75014 | S | Vinyl chloride, see Section 5210 | 1\n\nSource: \n", "cas_number": "75014", "file": "vinyl-chloride-see-section-5210.md", "generated": true, "harvested": "2026-08-05", "id": "vinyl-chloride-see-section-5210", "pel_ppm": "1", "source_quote": "75014 | S | Vinyl chloride, see Section 5210 | 1", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Vinyl chloride, see Section 5210", "title": "Vinyl chloride, see Section 5210 \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Vinyl chloride\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Vinyl chloride\n\n**CAS No.:** 75-01-4\n\n> CAS No. 75-01-4\n\n**NIOSH REL, as stated:** Ca See Appendix A\n\n> NIOSH REL Ca See Appendix A\n\nSource: \n", "cas_number": "75-01-4", "file": "vinyl-chloride.md", "generated": true, "harvested": "2026-09-08", "id": "vinyl-chloride", "quote_cas_number": "CAS No. 75-01-4", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Vinyl chloride", "rel_statement": "Ca See Appendix A", "source_quote": "NIOSH REL Ca See Appendix A", "sources": ["https://www.cdc.gov/niosh/npg/npgd0658.html"], "stale_after": "2027-09-08", "substance": "Vinyl chloride", "title": "Vinyl chloride \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Vinyl cyanide, see Acrylonitrile, Section 5213\n\n**CAS No.:** 107131\n\n> 107131 | S | Vinyl cyanide, see Acrylonitrile, Section 5213\n\nSource: \n", "cas_number": "107131", "file": "vinyl-cyanide-see-acrylonitrile-section-5213.md", "generated": true, "harvested": "2026-08-05", "id": "vinyl-cyanide-see-acrylonitrile-section-5213", "source_quote": "107131 | S | Vinyl cyanide, see Acrylonitrile, Section 5213", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Vinyl cyanide, see Acrylonitrile, Section 5213", "title": "Vinyl cyanide, see Acrylonitrile, Section 5213 \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Vinyl cyclohexene dioxide\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Vinyl cyclohexene dioxide\n\n**CAS No.:** 106-87-6\n\n> CAS No. 106-87-6\n\n**NIOSH REL (ppm):** TWA 10\n\n**NIOSH REL (mg/m\u00b3):** 60\n\n> NIOSH REL Ca TWA 10 ppm (60 mg/m3) [skin]\n\nSource: \n", "cas_number": "106-87-6", "file": "vinyl-cyclohexene-dioxide-2.md", "generated": true, "harvested": "2026-09-08", "id": "vinyl-cyclohexene-dioxide-2", "quote_cas_number": "CAS No. 106-87-6", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Vinyl cyclohexene dioxide", "rel_mgm3": "60", "rel_ppm": "TWA 10", "source_quote": "NIOSH REL Ca TWA 10 ppm (60 mg/m3) [skin]", "sources": ["https://www.cdc.gov/niosh/npg/npgd0659.html"], "stale_after": "2027-09-08", "substance": "Vinyl cyclohexene dioxide", "title": "Vinyl cyclohexene dioxide \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Vinyl cyclohexene dioxide\n\n**CAS No.:** 106876\n\n**PEL (ppm):** 0.1\n\n**PEL (mg/m\u00b3):** 0.57\n\n> 106876 | S | Vinyl cyclohexene dioxide | 0.1 | 0.57\n\nSource: \n", "cas_number": "106876", "file": "vinyl-cyclohexene-dioxide.md", "generated": true, "harvested": "2026-08-05", "id": "vinyl-cyclohexene-dioxide", "pel_mgm3": "0.57", "pel_ppm": "0.1", "source_quote": "106876 | S | Vinyl cyclohexene dioxide | 0.1 | 0.57", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Vinyl cyclohexene dioxide", "title": "Vinyl cyclohexene dioxide \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Vinyl fluoride\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Vinyl fluoride\n\n**CAS No.:** 75-02-5\n\n> CAS No. 75-02-5\n\n**NIOSH REL (ppm):** TWA 1\n\n> NIOSH REL TWA 1 ppm C 5 ppm [use 1910.1017]\n\nSource: \n", "cas_number": "75-02-5", "file": "vinyl-fluoride-2.md", "generated": true, "harvested": "2026-09-08", "id": "vinyl-fluoride-2", "quote_cas_number": "CAS No. 75-02-5", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Vinyl fluoride", "rel_ppm": "TWA 1", "source_quote": "NIOSH REL TWA 1 ppm C 5 ppm [use 1910.1017]", "sources": ["https://www.cdc.gov/niosh/npg/npgd0660.html"], "stale_after": "2027-09-08", "substance": "Vinyl fluoride", "title": "Vinyl fluoride \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Vinyl fluoride\n\n**CAS No.:** 75025\n\n**PEL (ppm):** 0.2\n\n**PEL (mg/m\u00b3):** 0.38\n\n> 75025 | | Vinyl fluoride | 0.2 | 0.38\n\nSource: \n", "cas_number": "75025", "file": "vinyl-fluoride.md", "generated": true, "harvested": "2026-08-05", "id": "vinyl-fluoride", "pel_mgm3": "0.38", "pel_ppm": "0.2", "source_quote": "75025 | | Vinyl fluoride | 0.2 | 0.38", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Vinyl fluoride", "title": "Vinyl fluoride \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Vinyl toluene\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Vinyl toluene\n\n**CAS No.:** 25013-15-4 (inhibited)\n\n> CAS No. 25013-15-4 (inhibited)\n\n**NIOSH REL (ppm):** TWA 100\n\n**NIOSH REL (mg/m\u00b3):** 480\n\n> NIOSH REL TWA 100 ppm (480 mg/m3)\n\nSource: \n", "cas_number": "25013-15-4 (inhibited)", "file": "vinyl-toluene-2.md", "generated": true, "harvested": "2026-09-08", "id": "vinyl-toluene-2", "quote_cas_number": "CAS No. 25013-15-4 (inhibited)", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Vinyl toluene", "rel_mgm3": "480", "rel_ppm": "TWA 100", "source_quote": "NIOSH REL TWA 100 ppm (480 mg/m3)", "sources": ["https://www.cdc.gov/niosh/npg/npgd0663.html"], "stale_after": "2027-09-08", "substance": "Vinyl toluene", "title": "Vinyl toluene \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Vinyl toluene\n\n**CAS No.:** 25013-15-4\n\n**PEL (ppm):** 100\n\n**PEL (mg/m\u00b3):** 480\n\n> Vinyl toluene | 25013-15-4 | 100 | 480 | - |\n\nSource: \n", "cas_number": "25013-15-4", "file": "vinyl-toluene.md", "generated": true, "harvested": "2026-08-05", "id": "vinyl-toluene", "pel_mgm3": "480", "pel_ppm": "100", "source_quote": "Vinyl toluene | 25013-15-4 | 100 | 480 | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Vinyl toluene", "title": "Vinyl toluene \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Vinylbenzene; see Styrene\n\n**CAS No.:** 100425\n\n> 100425 | | Vinylbenzene; see Styrene\n\nSource: \n", "cas_number": "100425", "file": "vinylbenzene-see-styrene.md", "generated": true, "harvested": "2026-08-05", "id": "vinylbenzene-see-styrene", "source_quote": "100425 | | Vinylbenzene; see Styrene", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Vinylbenzene; see Styrene", "title": "Vinylbenzene; see Styrene \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Vinylidene chloride; 1,1-dichloroethylene\n\n**CAS No.:** 75354\n\n**PEL (ppm):** 1\n\n**PEL (mg/m\u00b3):** 4\n\n> 75354 | | Vinylidene chloride; 1,1-dichloroethylene | 1 | 4\n\nSource: \n", "cas_number": "75354", "file": "vinylidene-chloride-1-1-dichloroethylene.md", "generated": true, "harvested": "2026-08-05", "id": "vinylidene-chloride-1-1-dichloroethylene", "pel_mgm3": "4", "pel_ppm": "1", "source_quote": "75354 | | Vinylidene chloride; 1,1-dichloroethylene | 1 | 4", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Vinylidene chloride; 1,1-dichloroethylene", "title": "Vinylidene chloride; 1,1-dichloroethylene \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Vinylidene chloride\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Vinylidene chloride\n\n**CAS No.:** 75-35-4\n\n> CAS No. 75-35-4\n\n**NIOSH REL, as stated:** Ca See Appendix A\n\n> NIOSH REL Ca See Appendix A\n\nSource: \n", "cas_number": "75-35-4", "file": "vinylidene-chloride.md", "generated": true, "harvested": "2026-09-08", "id": "vinylidene-chloride", "quote_cas_number": "CAS No. 75-35-4", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Vinylidene chloride", "rel_statement": "Ca See Appendix A", "source_quote": "NIOSH REL Ca See Appendix A", "sources": ["https://www.cdc.gov/niosh/npg/npgd0661.html"], "stale_after": "2027-09-08", "substance": "Vinylidene chloride", "title": "Vinylidene chloride \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Vinylidene fluoride\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Vinylidene fluoride\n\n**CAS No.:** 75-38-7\n\n> CAS No. 75-38-7\n\n**NIOSH REL (ppm):** TWA 1\n\n> NIOSH REL TWA 1 ppm C 5 ppm [use 1910.1017]\n\nSource: \n", "cas_number": "75-38-7", "file": "vinylidene-fluoride-2.md", "generated": true, "harvested": "2026-09-08", "id": "vinylidene-fluoride-2", "quote_cas_number": "CAS No. 75-38-7", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Vinylidene fluoride", "rel_ppm": "TWA 1", "source_quote": "NIOSH REL TWA 1 ppm C 5 ppm [use 1910.1017]", "sources": ["https://www.cdc.gov/niosh/npg/npgd0662.html"], "stale_after": "2027-09-08", "substance": "Vinylidene fluoride", "title": "Vinylidene fluoride \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Vinylidene fluoride\n\n**CAS No.:** 75387\n\n**PEL (ppm):** 100\n\n**PEL (mg/m\u00b3):** 262\n\n> 75387 | | Vinylidene fluoride | 100 | 262\n\nSource: \n", "cas_number": "75387", "file": "vinylidene-fluoride.md", "generated": true, "harvested": "2026-08-05", "id": "vinylidene-fluoride", "pel_mgm3": "262", "pel_ppm": "100", "source_quote": "75387 | | Vinylidene fluoride | 100 | 262", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Vinylidene fluoride", "title": "Vinylidene fluoride \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Vinyltoluene\n\n**CAS No.:** 25013154\n\n**PEL (ppm):** 50\n\n**PEL (mg/m\u00b3):** 240\n\n> 25013154 | | Vinyltoluene | 50 | 240\n\nSource: \n", "cas_number": "25013154", "file": "vinyltoluene.md", "generated": true, "harvested": "2026-08-05", "id": "vinyltoluene", "pel_mgm3": "240", "pel_ppm": "50", "source_quote": "25013154 | | Vinyltoluene | 50 | 240", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Vinyltoluene", "title": "Vinyltoluene \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** VM & P Naphtha\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - VM & P Naphtha\n\n**CAS No.:** 8032-32-4\n\n> CAS No. 8032-32-4\n\n**NIOSH REL (mg/m\u00b3):** TWA 350\n\n> NIOSH REL TWA 350 mg/m3 C 1800 mg/m3 [15-minute]\n\nSource: \n", "cas_number": "8032-32-4", "file": "vm-p-naphtha.md", "generated": true, "harvested": "2026-09-08", "id": "vm-p-naphtha", "quote_cas_number": "CAS No. 8032-32-4", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - VM & P Naphtha", "rel_mgm3": "TWA 350", "source_quote": "NIOSH REL TWA 350 mg/m3 C 1800 mg/m3 [15-minute]", "sources": ["https://www.cdc.gov/niosh/npg/npgd0664.html"], "stale_after": "2027-09-08", "substance": "VM & P Naphtha", "title": "VM & P Naphtha \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** VM & P (Varnish Makers and Painters) Naphtha\n\n**CAS No.:** 8030306\n\n**PEL (ppm):** 300\n\n**PEL (mg/m\u00b3):** 1,350\n\n**STEL (ppm):** 400\n\n**STEL (mg/m\u00b3):** 1800\n\n> 8030306 | | VM & P (Varnish Makers and Painters) Naphtha | 300 | 1,350 | | 400 | 1800\n\nSource: \n", "cas_number": "8030306", "file": "vm-p-varnish-makers-and-painters-naphtha.md", "generated": true, "harvested": "2026-08-05", "id": "vm-p-varnish-makers-and-painters-naphtha", "pel_mgm3": "1,350", "pel_ppm": "300", "source_quote": "8030306 | | VM & P (Varnish Makers and Painters) Naphtha | 300 | 1,350 | | 400 | 1800", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "stel_mgm3": "1800", "stel_ppm": "400", "substance": "VM & P (Varnish Makers and Painters) Naphtha", "title": "VM & P (Varnish Makers and Painters) Naphtha \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Warfarin\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Warfarin\n\n**CAS No.:** 81-81-2\n\n> CAS No. 81-81-2\n\n**NIOSH REL (mg/m\u00b3):** TWA 0.1\n\n> NIOSH REL TWA 0.1 mg/m3\n\nSource: \n", "cas_number": "81-81-2", "file": "warfarin-2.md", "generated": true, "harvested": "2026-09-08", "id": "warfarin-2", "quote_cas_number": "CAS No. 81-81-2", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Warfarin", "rel_mgm3": "TWA 0.1", "source_quote": "NIOSH REL TWA 0.1 mg/m3", "sources": ["https://www.cdc.gov/niosh/npg/npgd0665.html"], "stale_after": "2027-09-08", "substance": "Warfarin", "title": "Warfarin \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Warfarin; 3-(alpha-acetonyl-benzyl)-4-hydroxycoumarin\n\n**CAS No.:** 81812\n\n**PEL (mg/m\u00b3):** 0.1\n\n> 81812 | | Warfarin; 3-(alpha-acetonyl-benzyl)-4-hydroxycoumarin | -- | 0.1\n\nSource: \n", "cas_number": "81812", "file": "warfarin-3-alpha-acetonyl-benzyl-4-hydroxycoumarin.md", "generated": true, "harvested": "2026-08-05", "id": "warfarin-3-alpha-acetonyl-benzyl-4-hydroxycoumarin", "pel_mgm3": "0.1", "source_quote": "81812 | | Warfarin; 3-(alpha-acetonyl-benzyl)-4-hydroxycoumarin | -- | 0.1", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Warfarin; 3-(alpha-acetonyl-benzyl)-4-hydroxycoumarin", "title": "Warfarin; 3-(alpha-acetonyl-benzyl)-4-hydroxycoumarin \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Warfarin\n\n**CAS No.:** 81-81-2\n\n**PEL (mg/m\u00b3):** 0.1\n\n> Warfarin | 81-81-2 | - | 0.1 | - |\n\nSource: \n", "cas_number": "81-81-2", "file": "warfarin.md", "generated": true, "harvested": "2026-08-05", "id": "warfarin", "pel_mgm3": "0.1", "source_quote": "Warfarin | 81-81-2 | - | 0.1 | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Warfarin", "title": "Warfarin \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Xylene; xylol; dimethylbenzene\n\n**CAS No.:** 1330207\n\n**PEL (ppm):** 100\n\n**PEL (mg/m\u00b3):** 435\n\n**Ceiling:** 300 ppm\n\n**STEL (ppm):** 150\n\n**STEL (mg/m\u00b3):** 655\n\n> 1330207 | | Xylene; xylol; dimethylbenzene | 100 | 435 | 300 ppm | 150 | 655\n\nSource: \n", "cas_number": "1330207", "ceiling": "300 ppm", "file": "xylene-xylol-dimethylbenzene.md", "generated": true, "harvested": "2026-08-05", "id": "xylene-xylol-dimethylbenzene", "pel_mgm3": "435", "pel_ppm": "100", "source_quote": "1330207 | | Xylene; xylol; dimethylbenzene | 100 | 435 | 300 ppm | 150 | 655", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "stel_mgm3": "655", "stel_ppm": "150", "substance": "Xylene; xylol; dimethylbenzene", "title": "Xylene; xylol; dimethylbenzene \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Xylenes (o-, m-, p-isomers)\n\n**CAS No.:** 1330-20-7\n\n**PEL (ppm):** 100\n\n**PEL (mg/m\u00b3):** 435\n\n> Xylenes (o-, m-, p-isomers) | 1330-20-7 | 100 | 435 | - |\n\nSource: \n", "cas_number": "1330-20-7", "file": "xylenes-o-m-p-isomers.md", "generated": true, "harvested": "2026-08-05", "id": "xylenes-o-m-p-isomers", "pel_mgm3": "435", "pel_ppm": "100", "source_quote": "Xylenes (o-, m-, p-isomers) | 1330-20-7 | 100 | 435 | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Xylenes (o-, m-, p-isomers)", "title": "Xylenes (o-, m-, p-isomers) \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Xylidine\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Xylidine\n\n**CAS No.:** 1300-73-8\n\n> CAS No. 1300-73-8\n\n**NIOSH REL (ppm):** TWA 2\n\n**NIOSH REL (mg/m\u00b3):** 10\n\n> NIOSH REL TWA 2 ppm (10 mg/m3) [skin]\n\nSource: \n", "cas_number": "1300-73-8", "file": "xylidine-2.md", "generated": true, "harvested": "2026-09-08", "id": "xylidine-2", "quote_cas_number": "CAS No. 1300-73-8", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Xylidine", "rel_mgm3": "10", "rel_ppm": "TWA 2", "source_quote": "NIOSH REL TWA 2 ppm (10 mg/m3) [skin]", "sources": ["https://www.cdc.gov/niosh/npg/npgd0672.html"], "stale_after": "2027-09-08", "substance": "Xylidine", "title": "Xylidine \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Xylidine; aminodimethylbenzene\n\n**CAS No.:** 1300738\n\n**PEL (ppm):** 0.5\n\n**PEL (mg/m\u00b3):** 2.5\n\n> 1300738 | S | Xylidine; aminodimethylbenzene | 0.5 | 2.5\n\nSource: \n", "cas_number": "1300738", "file": "xylidine-aminodimethylbenzene.md", "generated": true, "harvested": "2026-08-05", "id": "xylidine-aminodimethylbenzene", "pel_mgm3": "2.5", "pel_ppm": "0.5", "source_quote": "1300738 | S | Xylidine; aminodimethylbenzene | 0.5 | 2.5", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Xylidine; aminodimethylbenzene", "title": "Xylidine; aminodimethylbenzene \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Xylidine\n\n**CAS No.:** 1300-73-8\n\n**PEL (ppm):** 5\n\n**PEL (mg/m\u00b3):** 25\n\n> Xylidine | 1300-73-8 | 5 | 25 | X |\n\nSource: \n", "cas_number": "1300-73-8", "file": "xylidine.md", "generated": true, "harvested": "2026-08-05", "id": "xylidine", "pel_mgm3": "25", "pel_ppm": "5", "source_quote": "Xylidine | 1300-73-8 | 5 | 25 | X |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Xylidine", "title": "Xylidine \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Yttrium\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Yttrium\n\n**CAS No.:** 7440-65-5\n\n> CAS No. 7440-65-5\n\n**NIOSH REL (mg/m\u00b3):** TWA 1\n\n> NIOSH REL TWA 1 mg/m3\n\nSource: \n", "cas_number": "7440-65-5", "file": "yttrium-2.md", "generated": true, "harvested": "2026-09-08", "id": "yttrium-2", "quote_cas_number": "CAS No. 7440-65-5", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Yttrium", "rel_mgm3": "TWA 1", "source_quote": "NIOSH REL TWA 1 mg/m3", "sources": ["https://www.cdc.gov/niosh/npg/npgd0673.html"], "stale_after": "2027-09-08", "substance": "Yttrium", "title": "Yttrium \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Yttrium\n\n**CAS No.:** 7440-65-5\n\n**PEL (mg/m\u00b3):** 1\n\n> Yttrium | 7440-65-5 | - | 1 | - |\n\nSource: \n", "cas_number": "7440-65-5", "file": "yttrium.md", "generated": true, "harvested": "2026-08-05", "id": "yttrium", "pel_mgm3": "1", "source_quote": "Yttrium | 7440-65-5 | - | 1 | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Yttrium", "title": "Yttrium \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Zinc chloride fume\n\n**CAS No.:** 7646857\n\n**PEL (mg/m\u00b3):** 1\n\n**STEL (mg/m\u00b3):** 2\n\n> 7646857 | | Zinc chloride fume | -- | 1 | | -- | 2\n\nSource: \n", "cas_number": "7646857", "file": "zinc-chloride-fume-2.md", "generated": true, "harvested": "2026-08-05", "id": "zinc-chloride-fume-2", "pel_mgm3": "1", "source_quote": "7646857 | | Zinc chloride fume | -- | 1 | | -- | 2", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "stel_mgm3": "2", "substance": "Zinc chloride fume", "title": "Zinc chloride fume \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Zinc chloride fume\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Zinc chloride fume\n\n**CAS No.:** 7646-85-7\n\n> CAS No. 7646-85-7\n\n**NIOSH REL (mg/m\u00b3):** TWA 1\n\n> NIOSH REL TWA 1 mg/m3 ST 2 mg/m3\n\nSource: \n", "cas_number": "7646-85-7", "file": "zinc-chloride-fume-3.md", "generated": true, "harvested": "2026-09-08", "id": "zinc-chloride-fume-3", "quote_cas_number": "CAS No. 7646-85-7", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Zinc chloride fume", "rel_mgm3": "TWA 1", "source_quote": "NIOSH REL TWA 1 mg/m3 ST 2 mg/m3", "sources": ["https://www.cdc.gov/niosh/npg/npgd0674.html"], "stale_after": "2027-09-08", "substance": "Zinc chloride fume", "title": "Zinc chloride fume \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Zinc chloride fume\n\n**CAS No.:** 7646-85-7\n\n**PEL (mg/m\u00b3):** 1\n\n> Zinc chloride fume | 7646-85-7 | - | 1 | - |\n\nSource: \n", "cas_number": "7646-85-7", "file": "zinc-chloride-fume.md", "generated": true, "harvested": "2026-08-05", "id": "zinc-chloride-fume", "pel_mgm3": "1", "source_quote": "Zinc chloride fume | 7646-85-7 | - | 1 | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Zinc chloride fume", "title": "Zinc chloride fume \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Zinc chromate, as Cr\n\n**CAS No.:** 13530659\n\n**PEL (mg/m\u00b3):** 0.005\n\n> 13530659 | | Zinc chromate, as Cr | -- | 0.005\n\nSource: \n", "cas_number": "13530659", "file": "zinc-chromate-as-cr.md", "generated": true, "harvested": "2026-08-05", "id": "zinc-chromate-as-cr", "pel_mgm3": "0.005", "source_quote": "13530659 | | Zinc chromate, as Cr | -- | 0.005", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Zinc chromate, as Cr", "title": "Zinc chromate, as Cr \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Zinc chromate hydroxide, as Cr\n\n**CAS No.:** 15930946\n\n**PEL (mg/m\u00b3):** 0.005\n\n> 15930946 | | Zinc chromate hydroxide, as Cr | -- | 0.005\n\nSource: \n", "cas_number": "15930946", "file": "zinc-chromate-hydroxide-as-cr.md", "generated": true, "harvested": "2026-08-05", "id": "zinc-chromate-hydroxide-as-cr", "pel_mgm3": "0.005", "source_quote": "15930946 | | Zinc chromate hydroxide, as Cr | -- | 0.005", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Zinc chromate hydroxide, as Cr", "title": "Zinc chromate hydroxide, as Cr \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Zinc oxide\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Zinc oxide\n\n**CAS No.:** 1314-13-2\n\n> CAS No. 1314-13-2\n\n**NIOSH REL, as stated:** Dust: TWA 5 mg/m3 C 15 mg/m3 Fume: TWA 5 mg/m3 ST 10 mg/m3\n\n> NIOSH REL Dust: TWA 5 mg/m3 C 15 mg/m3 Fume: TWA 5 mg/m3 ST 10 mg/m3\n\nSource: \n", "cas_number": "1314-13-2", "file": "zinc-oxide-2.md", "generated": true, "harvested": "2026-09-08", "id": "zinc-oxide-2", "quote_cas_number": "CAS No. 1314-13-2", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Zinc oxide", "rel_statement": "Dust: TWA 5 mg/m3 C 15 mg/m3 Fume: TWA 5 mg/m3 ST 10 mg/m3", "source_quote": "NIOSH REL Dust: TWA 5 mg/m3 C 15 mg/m3 Fume: TWA 5 mg/m3 ST 10 mg/m3", "sources": ["https://www.cdc.gov/niosh/npg/npgd0675.html"], "stale_after": "2027-09-08", "substance": "Zinc oxide", "title": "Zinc oxide \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Zinc oxide fume\n\n**CAS No.:** 1314132\n\n**PEL (mg/m\u00b3):** 5\n\n**STEL (mg/m\u00b3):** 10\n\n> 1314132 | | Zinc oxide fume | -- | 5 | | -- | 10\n\nSource: \n", "cas_number": "1314132", "file": "zinc-oxide-fume-2.md", "generated": true, "harvested": "2026-08-05", "id": "zinc-oxide-fume-2", "pel_mgm3": "5", "source_quote": "1314132 | | Zinc oxide fume | -- | 5 | | -- | 10", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "stel_mgm3": "10", "substance": "Zinc oxide fume", "title": "Zinc oxide fume \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Zinc oxide fume\n\n**CAS No.:** 1314-13-2\n\n**PEL (mg/m\u00b3):** 5\n\n> Zinc oxide fume | 1314-13-2 | - | 5 | - |\n\nSource: \n", "cas_number": "1314-13-2", "file": "zinc-oxide-fume.md", "generated": true, "harvested": "2026-08-05", "id": "zinc-oxide-fume", "pel_mgm3": "5", "source_quote": "Zinc oxide fume | 1314-13-2 | - | 5 | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Zinc oxide fume", "title": "Zinc oxide fume \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Zinc oxide\n\n**CAS No.:** 1314-13-2\n\n> Zinc oxide | 1314-13-2 | - | - | - |\n\nSource: \n", "cas_number": "1314-13-2", "file": "zinc-oxide.md", "generated": true, "harvested": "2026-08-05", "id": "zinc-oxide", "source_quote": "Zinc oxide | 1314-13-2 | - | - | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Zinc oxide", "title": "Zinc oxide \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Zinc potassium chromate, as Cr\n\n**CAS No.:** 11103869\n\n**PEL (mg/m\u00b3):** 0.005\n\n> 11103869 | | Zinc potassium chromate, as Cr | -- | 0.005\n\nSource: \n", "cas_number": "11103869", "file": "zinc-potassium-chromate-as-cr.md", "generated": true, "harvested": "2026-08-05", "id": "zinc-potassium-chromate-as-cr", "pel_mgm3": "0.005", "source_quote": "11103869 | | Zinc potassium chromate, as Cr | -- | 0.005", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Zinc potassium chromate, as Cr", "title": "Zinc potassium chromate, as Cr \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Zinc stearate\n\n**CAS No.:** 557051\n\n**PEL (mg/m\u00b3):** 10\n\n> 557051 | | Zinc stearate | -- | 10\n\nSource: \n", "cas_number": "557051", "file": "zinc-stearate-2.md", "generated": true, "harvested": "2026-08-05", "id": "zinc-stearate-2", "pel_mgm3": "10", "source_quote": "557051 | | Zinc stearate | -- | 10", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Zinc stearate", "title": "Zinc stearate \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Zinc stearate\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Zinc stearate\n\n**CAS No.:** 557-05-1\n\n> CAS No. 557-05-1\n\n**NIOSH REL, as stated:** TWA 10 mg/m3 (total) TWA 5 mg/m3 (resp)\n\n> NIOSH REL TWA 10 mg/m3 (total) TWA 5 mg/m3 (resp)\n\nSource: \n", "cas_number": "557-05-1", "file": "zinc-stearate-3.md", "generated": true, "harvested": "2026-09-08", "id": "zinc-stearate-3", "quote_cas_number": "CAS No. 557-05-1", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Zinc stearate", "rel_statement": "TWA 10 mg/m3 (total) TWA 5 mg/m3 (resp)", "source_quote": "NIOSH REL TWA 10 mg/m3 (total) TWA 5 mg/m3 (resp)", "sources": ["https://www.cdc.gov/niosh/npg/npgd0676.html"], "stale_after": "2027-09-08", "substance": "Zinc stearate", "title": "Zinc stearate \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Zinc stearate\n\n**CAS No.:** 557-05-1\n\n> Zinc stearate | 557-05-1 | - | - | - |\n\nSource: \n", "cas_number": "557-05-1", "file": "zinc-stearate.md", "generated": true, "harvested": "2026-08-05", "id": "zinc-stearate", "source_quote": "Zinc stearate | 557-05-1 | - | - | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Zinc stearate", "title": "Zinc stearate \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Zinc yellow, as Cr\n\n**CAS No.:** 37300235\n\n**PEL (mg/m\u00b3):** 0.005\n\n> 37300235 | | Zinc yellow, as Cr | -- | 0.005\n\nSource: \n", "cas_number": "37300235", "file": "zinc-yellow-as-cr.md", "generated": true, "harvested": "2026-08-05", "id": "zinc-yellow-as-cr", "pel_mgm3": "0.005", "source_quote": "37300235 | | Zinc yellow, as Cr | -- | 0.005", "sources": ["https://www.dir.ca.gov/title8/5155.html"], "stale_after": "2027-08-05", "substance": "Zinc yellow, as Cr", "title": "Zinc yellow, as Cr \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Zirconium compounds (as Zr)\n\n> CDC - NIOSH Pocket Guide to Chemical Hazards - Zirconium compounds (as Zr)\n\n**CAS No.:** 7440-67-7 (Metal)\n\n> CAS No. 7440-67-7 (Metal)\n\n**NIOSH REL (mg/m\u00b3):** TWA 5\n\n> NIOSH REL TWA 5 mg/m3 ST 10 mg/m3\n\nSource: \n", "cas_number": "7440-67-7 (Metal)", "file": "zirconium-compounds-as-zr-2.md", "generated": true, "harvested": "2026-09-08", "id": "zirconium-compounds-as-zr-2", "quote_cas_number": "CAS No. 7440-67-7 (Metal)", "quote_substance": "CDC - NIOSH Pocket Guide to Chemical Hazards - Zirconium compounds (as Zr)", "rel_mgm3": "TWA 5", "source_quote": "NIOSH REL TWA 5 mg/m3 ST 10 mg/m3", "sources": ["https://www.cdc.gov/niosh/npg/npgd0677.html"], "stale_after": "2027-09-08", "substance": "Zirconium compounds (as Zr)", "title": "Zirconium compounds (as Zr) \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "tool", "verified": true} {"asset": "workplace-exposure-limits", "body": "**Substance:** Zirconium compounds (as Zr)\n\n**CAS No.:** 7440-67-7\n\n**PEL (mg/m\u00b3):** 5\n\n> Zirconium compounds (as Zr) | 7440-67-7 | - | 5 | - |\n\nSource: \n", "cas_number": "7440-67-7", "file": "zirconium-compounds-as-zr.md", "generated": true, "harvested": "2026-08-05", "id": "zirconium-compounds-as-zr", "pel_mgm3": "5", "source_quote": "Zirconium compounds (as Zr) | 7440-67-7 | - | 5 | - |", "sources": ["https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1"], "stale_after": "2027-08-05", "substance": "Zirconium compounds (as Zr)", "title": "Zirconium compounds (as Zr) \u2014 US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side", "type": "threshold", "verified": true}