US workplace chemical exposure limits: federal OSHA vs Cal/OSHA, side by side

Name: US workplace chemical exposure limits: federal OSHA vs Cal/OSHA, side by side
Creator: Reference Source
License: US and California government works — public domain. ACGIH TLVs deliberately excluded (copyrighted). NIOSH RELs excluded: obtainable only second-hand.

Airborne exposure limits for workplace chemicals as stated by two independent authorities: federal OSHA's Table Z-1 (29 CFR 1910.1000) and California's own Table AC-1 (8 CCR 5155). Each record is one substance with the permissible exposure limit that agency publishes for it, the URL it came from and the verbatim table row it was read from. **The product is the disagreement**: where both regulate the same substance California is frequently stricter — acetaldehyde 200 ppm federally against 25 ppm in California, 1,1-dimethylhydrazine 0.5 against 0.01 — and exceeding a PEL is what triggers engineering controls, PPE and medical surveillance, so which number applies is consequential. Answers 'what is the exposure limit for [chemical]?', 'is the California PEL different from OSHA's?' and 'what is the PEL for acetone' — the questions where an assistant gives one number without saying whose it is.

Records1,031

Sources2

Verified2026-08-05

Review by2027-08-05

LicenceUS and California government works — public domain. ACGIH TLVs deliberately excluded (copyrighted). NIOSH RELs excluded: obtainable only second-hand.

153 records where two or more sources state different values. Both sides are reproduced on the record page, each with its own source and quote.

The data

Substance	CAS No.	PEL (ppm)	PEL (mg/m³)	Ceiling	STEL (ppm)	STEL (mg/m³)
1,1,1,2-Tetrachloro-2,2-difluoroethanesources differ	76-11-9	500	4170
1,1,1,-Trichloro-2,2-bis(p-chlorophenyl)ethane; see DDT
1,1,1-Trichloroethane; see Methyl chloroform
1,1,2,2-Tetrabromoethane; see Acetylene tetrabromide
1,1,2,2-Tetrachloro-1,2-difluoroethane	76-12-0	500	4170
1,1,2,2-Tetrachloro-1,2-difluoroethane; fluorocarbon 112		500	4,170
1,1,2,2-Tetrachloroethane	79-34-5	5	35
1,1,2,2-Tetrachloroethane; acetylene tetrachloride		1	7
1,1,2-Trichloro-1,2,2-trifluoroethanesources differ	76-13-1	1000	7600
1,1,2-Trichloroethanesources differ	79-00-5	10	45
1,1-Dichloro-1-nitroethanesources differ	594-72-9	(C)10	(C)60
1,1-Dichloroethanesources differ	75-34-3	100	400
1,1-Dichloroethylene; see Vinylidene chloride
1,1-Dimethylhydrazinesources differ	57-14-7	0.5	1
1,2,3-Trichloropropanesources differ	96-18-4	50	300
1,2,4-Trichlorobenzene		5	40	C
1,2-Diaminoethane; see Ethylenediamine Diatomacous earth; see Silica-amorphous
1,2-Dibromo-3-chloropropane (DBCP); see 1910.1044	96-12-8
1,2-Dibromo-3-chloropropane; DBCP; see Section 5212		.001	.01
1,2-Dibromoethane; see Ethylene dibromide, Section 5219
1,2-Dichloroethane, see Ethylene dichloride
1,2-Dichloroethylene	540-59-0	200	790
1,2-Dichloroethylene; acetylene dichloride		200	790
1,2-Dichloropropane; see Propylene dichloride
1,2-Dichlorotetrafluoroethane; Fluorocarbon 114		1,000	7,000
1,2-Epoxypropane; see Propylene oxide
1,3,5-Triglycidyl-s-triazinetrione			0.005
1,3-Butadiene (see also section 5201)		1	2.2		5	11
1,3-Dichloro-5,5-dimethyl hydantoinsources differ	118-52-5		0.2
1,3-Dimethylbutyl acetate; see sec-Hexyl acetate
1,4-Dichloro-2-butene		0.005	0.025
1,4-Diethylene dioxide; see p-Dioxane
1,6-Hexanediamine		0.5	2.3
1-bromopropane, n-propyl bromide		5	25
1-Butanethiol; see Butyl mercaptan
1-Butanol; see n-Butyl alcohol
1-Chloro-1-nitropropanesources differ	600-25-9	20	100
1-Chloro-2,3-epoxypropane; see Epichlorohydrin
1-Chloro-4-nitrobenzene; see p-Nitrochlorobenzene
1-Hexene		50	180
1-Naphthyl N-methylcarbamate; see Carbaryl
1-Nitropropanesources differ	108-03-2	25	90
2,2′-Azobisisobutyronitrile decomposition product, see Tetramethyl succinonitrile
2,2-Dichloropropionic acid		1	6
2,3-Epoxypropanol; see Glycidol
2,4,5-T (2,4,5-trichlorophenoxyacetic acid)	93-76-5		10
2,4,5-T;2,4,5-trichlorophenoxyacetic acid Talc; see Silicates			10
2,4,5-Trichlorophenoxyacetic acid see 2,4,5-T
2,4,6-Trinitrophenol; see Picric acid
2,4,6-Trinitrophenylmethyl nitramine; see Tetryl
2,4,6-Trinitrotoluene (TNT)	118-96-7		1.5
2,4,6-Trinitrotoluene; TNT			0.5
2,4-D;2,4-dichlorophenoxyacetic acid			10
2,4-D (Dichlorophenoxyacetic acid)	94-75-7		10
2,4-Dinitrotoluene			0.15
2,6-Di-tert-butyl-p-cresol			10
2,6-Dimethyl-4-heptanone; see Diisobutyl ketone
2-Acetylaminofluorene; N-fluoren-2-yl acetamide; see Section 5209
2-Acetylaminofluorine; see 1910.1014	53-96-3
2-Aminoethanol; see Ethanolamine
2-Aminonapthalene; see beta-Naphthylamine, Section 5209
2-Aminopyridinesources differ	504-29-0	0.5	2
2-Butanone (Methyl ethyl ketone)	78-93-3	200	590
2-Butanone; see Methyl ethyl ketone
2-Butoxyethanol	111-76-2	50	240
2-Butoxyethanol (EGBE)		20	97
2-Chloro-1,3-butadiene; see Chloroprene
2-Chloro-6-(trichloromethyl) pyridine	1929-82-4
2-Chloro-6-(trichloromethyl)pyridine; see Nitrapyrin
2-Chloroethanol; see Ethylene chlorohydrin
2-Chloropropionic acid		0.1	0.44
2-(Diethylamino) ethanol		2	9.6
2-Diethylaminoethanol	100-37-8	10	50
2-Ethoxyethanol		5	18
2-Ethoxyethanol (Cellosolve)	110-80-5	200	740
2-Ethoxyethyl acetate		5	27
2-Ethoxyethyl acetate (Cellosolve acetate)	111-15-9	100	540
2-Hexanone (Methyl n-butyl ketone)	591-78-6	100	410
2-Hexanone; see Methyl butyl ketone
2-Hydroxypropyl acrylate		0.5	3
2-Methoxyethanol		5	16
2-Methoxyethanol (Methyl cellosolve)	109-86-4	25	80
2-Methoxyethyl acetate		5	24
2-Methoxyethyl acetate (Methyl cellosolve acetate)	110-49-6	25	120
2-Methylbutyl acetate; see Pentyl acetate
2-Methylcyclopentadienyl manganese tricarbonyl, as Mn			0.2
2-N-Dibutylaminoethanol		2	14
2-Nitropropanesources differ	79-46-9	25	90
2-Pentanone (Methyl propyl ketone)	107-87-9	200	700
2-Pentanone; see Methyl propyl ketone
3,3'-Dichlorobenzidine; 4,4'-diamino-3,3'-dichlorobiphenyl; see Section 5209
3-Amyl acetate; see Pentyl acetate
3,′-Dichlorobenzidine; see 1910.1007	91-94-1
4,4′-Methylene bis(2-chloroaniline), see also Section 5215			0.01
4,4′-Methylene dianiline; MDA (see also Sections 1535 & 5200)		0.01	0.08		0.1	0.8
4,4′-Thiobis (6-tert, Butyl-m-cresol)	96-69-5
4,4′-Thiobis(6-tert-butyl-m-cresol
4,6-Dinitro-o-cresol; 2-methyl-4,6-dinitrophenol			0.2
4-Aminodiphenyl; see 1910.1011	92-67-1
4-Aminodiphenyl; see Section 5209
4-Dimethylaminoazobenzene; see 1910.1015	60-11-7
4-Dimethylaminoazobenzene, see Section 5209
4-Methoxyphenol			5
4-Nitrodiphenyl; see 1910.1003	92-93-3
4-Nitrodiphenyl, see Section 5209
4-Vinyl cyclohexene		0.1	0.4
a-Chloroacetophenone (Phenacyl chloride)	532-27-4	0.05	0.3
Acetaldehydesources differ	75-07-0	200	360
Acetic acidsources differ	64-19-7	10	25
Acetic anhydridesources differ	108-24-7	5	20
Acetonesources differ	67-64-1	1000	2400
Acetone cyanohydrin as CN		4.7	5	C
Acetonitrilesources differ	75-05-8	40	70
Acetophenone		10	49
Acetylene
Acetylene dichloride; see 1,2-Dichloroethylene
Acetylene tetrabromide	79-27-6	1	14
Acetylene tetrabromide: 1,1,2,2-tetrabromoethane		1	14
Acetylene tetrachloride; see 1,1,2,2-Tetrachloroethane
Acetylsalicylic acid (Aspirin)			5
Acroleinsources differ	107-02-8	0.1	0.25
Acrylamidesources differ	79-06-1		0.3
Acrylic acid		2	5.9
Acrylonitrile; see 1910.1045	107-13-1
Acrylonitrile; see Section 5213		2	4.5
Adipic acid			5
Adiponitrile		2	8.8
Aldrin	309-00-2		0.25
Aldrin; 1,2,3,4,10,10-hexachloro-1,4,4a,5,8,8a-hexahydro-endo-1,2-exo-5,8-dimethanonaphthalene			0.25
Allyl alcoholsources differ	107-18-6	2	5
Allyl chloridesources differ	107-05-1	1	3
Allyl glycidyl ether (AGE)	106-92-3	(C)10	(C)45
Allyl glycidyl ether; AGE		0.2	0.93
Allyl propyl disulfidesources differ	2179-59-1	2	12
alpha-Alumina	1344-28-1
alpha-Chloroacetophenone; phenacyl chloride		0.05	0.3
alpha-Methyl styrene	98-83-9	(C)100	(C)480
alpha-Methylacrylonitrile		1	3
alpha-Methylstyrene; 1-methyl-1-phenylethene		50	240		100	485
alpha-Naphthylamine; 1-naphthylamine, see Section 5209
alpha-Naphthylamine; see 1910.1004	134-32-7
Alumina; see Particulates not otherwise regulated
Aluminum distearate			10
Aluminum, metal (as Al)	7429-90-5
Aluminum stearate			10
Aluminum tristearate			10
Aminodimethylbenzene; see Xylidene
Amitrole			0.2
Ammoniasources differ	7664-41-7	50	35
Ammonium chloride fume			10			20
Ammonium perfluorooctanoate			0.01
Ammonium stearate			10
Ammonium sulfamatesources differ	7773-06-0
Aniline		2	7.6
Aniline and homologs	62-53-3	5	19
Anisidine (o-, p-isomers)	29191-52-4		0.5
Anisidine (ortho and para isomers)		0.1	0.5
Antimony and compounds (as Sb)	7440-36-0		0.5
ANTU; 1-(1-naphthyl)-2-thiourea; Bantu; Rattrack			0.3
ANTU (alpha Naphthylthiourea)	86-88-4		0.3
Argon
Arsenic and inorganic arsenic compounds; see also Section 5214			0.01
Arsenic, inorganic compounds (as As); see 1910.1018	7440-38-2
Arsenic, organic compounds (as As)	7440-38-2		0.5
Arsine	7784-42-1	0.05	0.2
Arsine; AsH $3		0.05	0.2
Asphalt (petroleum) fumes			5
Atrazine			5
Azinphos-methyl	86-50-0		0.2
Azinphos methyl; o,o-dimethyl S-(4-oxo-1,2,3-benzotriazin-3(4H)-ylmethyl) phosphorodithioate			0.2
Barium, soluble compounds (as Ba)	7440-39-3		0.5
Barium, soluble compounds, as Ba			0.5
Barium sulfate	7727-43-7
Barium sulfate; see Particulates not otherwise regulated
Benomylsources differ	17804-35-2
Benzene; see 1910.1028	71-43-2
Benzene; see also Section 5218		1			5
Benzidine; 4,4′-diaminobiphenyl, see Section 5209
Benzidine; see 1910.1010	92-87-5
Benzol; see Benzene
Benzoyl chloride		0.2	1.1	C
Benzoyl peroxide	94-36-0		5
Benzoyl peroxide; dibenzoyl peroxide			5
Benzyl acetate		10	61
Benzyl chloride	100-44-7	1	5
benzyl chloride; alpha-chlorotoluene		0.03	0.16
Beryllium, and beryllium compounds			0.0002	0.025mg/M 3		0.002
Beryllium and beryllium compounds (as Be); see 1926.1124 8	7440-41-7
beta-Chloroprene	126-99-8	25	90
beta-Naphthylamine; 2-naphthylamine, see Section 5209
beta-Naphthylamine; see 1910.1009	91-59-8
beta-Propiolactone, see Section 5209		0.5	1.5
beta-Propriolactone; see 1910.1013	57-57-8
Biphenyl; diphenyl; phenylbenzene		0.2	1.5
bis(Chloromethyl) ether; see 1910.1008	542-88-1
bis-Chloromethyl ether, see also Section 5209		0.001	0.005
Bis(chloromethyl) ether, see bis-Chloromethyl ether, Section 5209
Bis (Dimethylaminoethyl) ether (DMAEE)		0.05	0.328		0.15	0.983
Bismuth telluride
Bismuth telluride, Undoped	1304-82-1
Boron oxidesources differ	1303-86-2
Boron tribromide		1	10	C
Boron trifluoridesources differ	7637-07-2	(C)1	(C)3
Bromacil		1	10
Brominesources differ	7726-95-6	0.1	0.7
Bromine pentafluoride		0.1	0.7
Bromochloromethane; see Chlorobromethane
Bromoethane; see Ethyl bromide
Bromoform	75-25-2	0.5	5
Bromoform; tribromomethane		0.5	5
Bromomethane, see Methyl bromide
Bromotrifluoromethane; see Trifluorobromomethane
Butadiene (1,3-Butadiene); See 29 CFR 1910.1051; 29 CFR 1910.19(l)	106-99-0	1 ppm/5 ppm STEL
Butane		800	1,900
Butyl acrylate		2	11
Butyl mercaptan	109-79-5	10	35
Butylaminesources differ	109-73-9	(C)5	(C)15
Cadmium (as Cd); see 1910.1027	7440-43-9
Cadmium metal dust, as Cd
Cadmium oxide fume, as Cd
Calcium arsenate; see Arsenic, inorganic (see also Section 5214)
Calcium carbonate	1317-65-3
Calcium carbonate; see Particulates not otherwise regulated
Calcium cyanamide			0.5
Calcium hydroxidesources differ	1305-62-0
Calcium oxidesources differ	1305-78-8		5
Calcium silicate	1344-95-2
Calcium silicate (synthetic): see Particulates not otherwise regulated
Calcium stearate			10
Calcium sulfate	7778-18-9
Calcium sulfate; see Particulates not otherwise regulated
Camphor, synthetic	76-22-2		2
Camphor (synthetic)			2
Caprolactam dust			1			3
Caprolactam vapor		5	20		10	40
Captafol			0.1
Captan			5
Carbaryl; 1-naphthyl N-methylcarbamate			5
Carbaryl (Sevin)	63-25-2		5
Carbofuran			0.1
Carbon blacksources differ	1333-86-4		3.5
Carbon dioxidesources differ	124-38-9	5000	9000
Carbon disulfidesources differ	75-15-0
Carbon monoxidesources differ	630-08-0	50	55
Carbon tetrabromide		0.1	1.4		0.3	4
Carbon tetrachloridesources differ	56-23-5
Carbonyl chloride; see Phosgene
Carbonyl fluoride		2	5		5	15
Catechol; pyrocatechol		5	20
Cellulose	9004-34-6
Cellulose (paper fiber); see Particulates not otherwise regulated
Cesium hydroxide		2
Chlordane	57-74-9		0.5
Chlordane; 1,2,4,5,6,7,8,8-octachloro-3a,4,7,7a-tetrahydro-4,7-methanoindane			0.5
Chlorinated camphene	8001-35-2		0.5
Chlorinated camphene; toxaphene			0.5			1
Chlorinated diphenyl oxide	55720-99-5		0.5
Chlorinesources differ	7782-50-5	(C)1	(C)3
Chlorine dioxidesources differ	10049-04-4	0.1	0.3
Chlorine trifluoridesources differ	7790-91-2	(C)0.1	(C)0.4
Chloroacetaldehydesources differ	107-20-0	(C)1	(C)3
Chloroacetone		1	3.8	C
Chloroacetyl chloride		0.05	0.2		0.15	0.69
Chlorobenzene	108-90-7	75	350
Chlorobenzene; monochlorobenzene		10	46
Chlorobromomethane	74-97-5	200	1050
Chlorobromomethane; bromochloromethane		200	1,050
Chlorodifluoromethane; Fluorocarbon 22		1,000	3,500
Chlorodiphenyl (42% chlorine)			1
Chlorodiphenyl (42% Chlorine) (PCB)	53469-21-9		1
Chlorodiphenyl (54% chlorine)			0.5
Chlorodiphenyl (54% Chlorine) (PCB)	11097-69-1		0.5
Chloroethane; see Ethyl chloride
Chloroethylene, see Vinyl chloride, Section 5210
Chloroform (Trichloromethane)	67-66-3	(C)50	(C)240
Chloroform; trichloromethane		2	9.78
Chloromethane, see Methyl chloride
Chloromethyl methyl ether; see 1910.1006	107-30-2
Chloromethyl methyl ether; see Methyl chloromethyl ether, Section 5209
Chloropentafluoroethane		1,000	6,320
Chloropicrin	76-06-2	0.1	0.7
Chloropicrin; trichloronitromethane		0.1	0.7
Chloroprene; 2-chloro-1,3-butadiene		10	36
Chlorpyrifos			0.2
Chromium metal			0.5
Chromium metal and insol. salts (as Cr)	7440-47-3		1
Chromyl chloride		0.025	0.15
Clopidolsources differ	2971-90-6
Coal tar pitch volatiles (benzene soluble fraction), anthracene, BaP, phenanthrene, acridine, chrysene, pyrene	65966-93-2		0.2
Cobalt hydrocarbonyl, as Co			0.1
Cobalt metal, dust, and fume (as Co)	7440-48-4		0.1
Cobalt, metal fume and dust, as Co			0.02
Copper	7440-50-8
Copper metal fume, as Cu			0.1
Crag herbicide (Sesone)	136-78-7
Cresol, all isomers	1319-77-3	5	22
Cresol (all isomers)		5	22
Cristobalite,			0.05
Cristobalite; see 1910.1053 7	14464-46-1
Crotonaldehyde; beta-methylacrolein				0.3
Crufomate			5
Cumene	98-82-8	50	245
Cumene; isopropylbenzene		50	245
Cyanamide			2
Cyanogen		10	20
Cyanogen chloride		0.3	0.6	C
Cyclohexanesources differ	110-82-7	300	1050
Cyclohexanolsources differ	108-93-0	50	200
Cyclohexanonesources differ	108-94-1	50	200
Cyclohexenesources differ	110-83-8	300	1015
Cyclohexylamine		10	40
Cyclonite; RDX; cyclotrimethylenetrinitramine			0.07
Cyclopentadienesources differ	542-92-7	75	200
Cyclopentane		600	1,720
Cyhexatin; tricyclohexyltin hydroxide			5
D-Benzoquinone; see Quinone
DDT; 1,1,1-trichloro-2,2-bis-(p-chlorophenyl)ethane			1
DDVP, see Dichlorvos
Decaboranesources differ	17702-41-9	0.05	0.3
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
Demeton (Systox)	8065-48-3		0.1
Di-(2-ethylhexyl) phthalate; see Di-sec-octyl phthalate
Di-sec-octyl phthalate; bis(2 ethylhexyl) phthalate			5
Di-sec octyl phthalate (Di-(2-ethylhexyl) phthalate)	117-81-7		5
Diacetone alcohol (4-Hydroxy-4-methyl-2-pentanone)	123-42-2	50	240
Diacetone alcohol; 4-hydroxy-4-methyl-2-pentanone		50	240
Diazinon; o,o-diethyl o-(2-isopropyl-6-methyl-4-pyrimidinyl) phosphorothioate			0.1
Diazomethanesources differ	334-88-3	0.2	0.4
Dibenzoyl peroxide; see Benzoyl peroxide
Diboranesources differ	19287-45-7	0.1	0.1
Dibromodifluoromethane; see Difluorodibromomethane
Dibutyl phenyl phosphate		0.3	3.5
Dibutyl phosphatesources differ	107-66-4	1	5
Dibutyl phthalatesources differ	84-74-2		5
Dichloroacetylene		0.1	0.4	C
Dichlorodifluoromethanesources differ	75-71-8	1000	4950
Dichlorodiphenyltrichloroethane (DDT)	50-29-3		1
Dichloroethyl ether	111-44-4	(C)15	(C)90
Dichloroethyl ether; bis(2-chloroethyl) ether		5	30		10	60
Dichlorofluoromethane; Fluorocarbon 21		10	42
Dichloromethane; see Methylene chloride
Dichloromonofluoromethane	75-43-4	1000	4200
Dichloropropene		1	5
Dichlorotetrafluoroethane	76-14-2	1000	7000
Dichlorvos (DDVP)	62-73-7		1
Dichlorvos (DDVP); 2,2-dichlorovinyl dimethyl phosphate		0.1	1
Dicrotophos			0.25
Dicyclohexylmethane-4,4'-diisocyanate; see Methylene bis-(4-cyclohexylisocyanate)
Dicyclopentadiene		5	30
Dicyclopentadienyl ironsources differ	102-54-5
Dieldrin	60-57-1		0.25
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
Diethanolamine		0.46	2
Diethyl ether; see Ethyl ether
Diethyl ketone		200	705		300	1057
Diethyl phthalate			5
Diethylaminesources differ	109-89-7	25	75
Diethylene glycol diethyl ether, Ethyl diglyme		5	33
Diethylene glycol dimethyl ether, Diglyme		1	5.5		5	27
Difluorodibromomethane	75-61-6	100	860
Difluorodibromomethane; dibromodifluoromethane		100	860
Diglycidyl ether (DGE)	2238-07-5	(C)0.5	(C)2.8
Diglycidyl ether; DGE; bis(2,3-epoxypropyl) ether		0.1	0.5
Diisobutyl ketone	108-83-8	50	290
Diisobutyl ketone; 2,6-dimethyl-4-heptanone		25	150
Diisopropyl ether; see Isopryl ether
Diisopropylaminesources differ	108-18-9	5	20
Dimethoxymethane; see Methylal
Dimethyl-1,2-dibromo-2,2-dichloroethyl phosphate	300-76-5		3
Dimethyl acetamide	127-19-5	10	35
Dimethyl ketone; see Acetone
Dimethyl phthalate			5
Dimethyl sulfate	77-78-1	1	5
Dimethyl sulfate; methyl sulfate		0.1	0.5
Dimethylacetamide		10	35
Dimethylaminesources differ	124-40-3	10	18
Dimethylaminobenzene; see Xylidene
Dimethylaniline (N,N-Dimethylaniline)	121-69-7	5	25
Dimethylbenzene; see Xylene
Dimethylethoxysilane		0.5	2.1		1.5	6.4
Dimethylformamide	68-12-2	10	30
Dimethylformamide; DMF		10	30
Dimethylphthalate	131-11-3		5
Dinitolmide; 3,5-Dinitro-o-toluamide			5
Dinitro-o-cresol	534-52-1		0.2
Dinitrotoluene	25321-14-6		1.5
Dioxane (Diethylene dioxide)	123-91-1	100	360
Dioxathion			0.2
Diphenyl (Biphenyl)	92-52-4	0.2	1
Diphenyl; see Biphenyl
Diphenylamine; N-phenylaniline			10
Diphenylmethane diisocyanate; see Methylene bis(phenylisocyanate)
Dipropyl ketone		50	235
Dipropylene glycol methyl ethersources differ	34590-94-8	100	600
Diquat; 1,1'-ethylene-2,2'-dipyridinium dibromide
Disulfiram			2
Disulfoton; o,o-diethyl S-2-(ethylthio)ethyl phosphorodithioate			0.1
Diuron			10
Divinyl benzene		10	50
DMF; see Dimethylformamide
DMH; see 1,1-Dimethylhydrazine
Emery	12415-34-8
Emery; see Particulates not otherwise regulated
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
Endrin	72-20-8		0.1
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
Enflurane		2	15
Epichlorohydrin	106-89-8	5	19
Epichlorohydrin; 1-chloro-2, 3-epoxypropane		0.05	0.19
EPN	2104-64-5		0.5
EPN; o-ethyl o-(p-nitrophenyl) phenylphosphonothioate			0.1
Ethane
Ethanethiol; see Ethyl mercaptan
Ethanol; see Ethyl alcohol
Ethanolamine	141-43-5	3	6
Ethanolamine; 2-aminoethanol		3	8		6	15
Ethion			0.4
Ethyl acetatesources differ	141-78-6	400	1400
Ethyl acrylatesources differ	140-88-5	25	100
Ethyl alcohol (Ethanol)	64-17-5	1000	1900
Ethyl alcohol; ethanol		1,000	1,900
Ethyl amyl ketone (5-Methyl-3-heptanone)	541-85-5	25	130
Ethyl benzene	100-41-4	100	435
Ethyl bromidesources differ	74-96-4	200	890
Ethyl butyl ketone (3-Heptanone)	106-35-4	50	230
Ethyl butyl ketone; 3-heptanone		50	230		75	345
Ethyl chloride	75-00-3	1000	2600
Ethyl chloride; chloroethane		100	264
Ethyl cyanoacrylate		0.2	1.02
Ethyl ethersources differ	60-29-7	400	1200
Ethyl formatesources differ	109-94-4	100	300
Ethyl mercaptan	75-08-1	(C)10	(C)25
Ethyl mercaptan; ethanethiol		0.5	1
Ethyl methyl ketone; see Methyl ethyl ketone
Ethyl sec-amyl ketone; 5-methyl-3-heptanone		25	130
Ethyl silicate	78-10-4	100	850
Ethyl silicate; tetraethyl silicate		10	85
Ethyl tert-butyl ether		5	21
Ethylaminesources differ	75-04-7	10	18
Ethylbenzene		5	22		30	130
Ethylene
Ethylene chlorohydrin	107-07-3	5	16
Ethylene chlorohydrin; 2-chloroethanol		1	3	C
Ethylene dibromide	106-93-4
Ethylene dibromide; 1,2-dibromoethane, see Section 5219		0.13	1	C
Ethylene dichloride (1,2-Dichloroethane)	107-06-2
Ethylene dichloride; 1,2-dichloroethane		1	4	200 ppm	2	8
Ethylene glycol diethyl ether, 1,2-diethoxyethane		5	24
Ethylene glycol dimethyl ether, 1,2-dimethoxyethane, Glyme		1	3.7		5	18
Ethylene glycol dinitratesources differ	628-96-6	(C)0.2	(C)1
Ethylene glycol monoethyl ether, see 2-Ethoxyethanol
Ethylene glycol monomethyl ether acetate; see 2-Methoxyethyl acetate
Ethylene glycol monomethyl ether, see 2-Methoxyethanol
Ethylene glycol (vapor)		40	100	C
Ethylene oxide; see 1910.1047	75-21-8
Ethylene oxide; see Section 5220		1	2		5
Ethylenediamine	107-15-3	10	25
Ethylenediamine; 1,2-diaminoethane		10	25
Ethyleneimine; see 1910.1012	151-56-4
Ethyleneimine; see also Section 5209		0.5	1
Ethylidene chloride; see 1,1-Dichloroethane
Ethylidene norbornene		5	25	C
Fenamiphos			0.1
Fensulfothion			0.1
Fenthion			0.2
Ferbam	14484-64-1
Ferbam; ferric N,N-dimethylthiocarbamate			10
Ferrovanadium dustsources differ	12604-58-9		1
Fibrous glass, see Glass
Fluorinesources differ	7782-41-4	0.1	0.2
Fluorocarbon 11; see Trichlorofluoromethane
Fluorocarbon 112; see 1,1,2,2-Tetrachloro-1,2-difluoroethane
Fluorocarbon 113; see 1,1,2-Trichloro-1,2,2-trifluoroethane
Fluorocarbon 12; see Dichlorodifluoromethane
Fluorocarbon 21; see Dichlorofluoromethane
Fluorocarbon 22; see Chlorodifluoromethane
Fluorotrichloromethane; see Trichlorofluoromethane
Fluorotrichloromethane (Trichlorofluoromethane)	75-69-4	1000	5600
Fonofos			0.1
Formaldehyde; see 1910.1048	50-00-0
Formaldehyde, see Section 5217		0.75			2
Formamide		10	18
Formic acidsources differ	64-18-6	5	9
Furfuralsources differ	98-01-1	5	20
Furfuryl alcoholsources differ	98-00-0	50	200
Gasoline		300	900		500	1500
Germanium tetrahydride		0.2	0.6
Glutaraldehyde (t)		0.05	0.2	C
Glycerin (mist)	56-81-5
Glycerin mist; see Particulates not otherwise regulated
Glyceryl stearate			10
Glycidol	556-52-5	50	150
Glycidol; 2,3-epoxy-1-propanol		2	6.1
Glycol monobutyl ether; see 2-Butoxyethanol
Glycol monoethyl ether; see 2-Ethoxyethanol
Glycol monomethyl ether; see 2-Methoxyethanol
Glyoxal, 1,2-ethanedione			0.1 (s), (u)
Graphite, natural, respirable dust	7782-42-5
Graphite, natural respirable dust			2.5
Gypsum	13397-24-5
Gypsum; Calcium sulfate dihydrate; see Particulates not otherwise regulated
Hafniumsources differ	7440-58-6		0.5
Halothane		2	16
HDI; see Hexamethylene diisocyanate
Helium
Heptachlor	76-44-8		0.5
Heptachlor; 1,4,5,6,7,8,8-hepta-chloro-3a,4,7,7a-tetrahydro-4,7-methanoindene			0.05
Heptane (n-Heptane)	142-82-5	500	2000
Hexachlorobenzene			0.002
Hexachlorobutadiene		0.02	0.24
Hexachlorocyclopentadiene		0.01	0.11
Hexachloroethane	67-72-1	1	10
Hexachloroethane; perchloroethane		1	10
Hexachloronaphthalenesources differ	1335-87-1		0.2
Hexafluoroacetone; 1,1,1,3,3,3-hexafluoro-2-propanone		0.1	0.7
Hexamethylene diisocyanate; HDI		0.005	0.034
Hexone (Methyl isobutyl ketone)	108-10-1	100	410
Hexone; see Methyl isobutyl ketone
Hexylene glycol		25	125	C
Hydrazinesources differ	302-01-2	1	1.3
Hydrobromic acid; see Hydrogen bromide
Hydrochloric acid; see Hydrogen chloride
Hydrocyanic acid; see Hydrogen cyanide
Hydrofluoric acid; see Hydrogen fluoride
Hydrogen
Hydrogen bromidesources differ	10035-10-6	3	10
Hydrogen chloridesources differ	7647-01-0	(C)5	(C)7
Hydrogen cyanidesources differ	74-90-8	10	11
Hydrogen fluoride (as F)	7664-39-3
Hydrogen fluoride, as F		0.4	0.33		1	0.83
Hydrogen peroxide	7722-84-1	1	1.4
Hydrogen peroxide, as H $2 O $2		1	1.4
Hydrogen selenide (as Se)	7783-07-5	0.05	0.2
Hydrogen selenide, as Se		0.05	0.2
Hydrogen sulfidesources differ	7783-06-4
Hydrogenated terphenyls		0.5	5
Hydroquinone	123-31-9		2
Hydroquinone; 1,4-benezendiol			2
Indene		10	48
Indium			0.1
Iodinesources differ	7553-56-2	(C)0.1	(C)1
Iodoform		0.6	10
IPDI; see Isophorone diisocyanate
Iron oxide fumesources differ	1309-37-1		10
Iron pentacarbonyl, as Fe		0.1	0.8		0.2	1.6
Isoamyl acetate	123-92-2	100	525
Isoamyl acetate; 3-methylbutyl acetate; see Pentyl acetate
Isoamyl alcohol; 3-methylbutanol		100	360		125	450
Isoamyl alcohol (primary and secondary)	123-51-3	100	360
Isobutyl acetate	110-19-0	150	700
Isobutyl acetate; 2-methylpropyl acetate		150	700
Isobutyl alcohol	78-83-1	100	300
Isobutyl alcohol; 2-methylpropanol		50	150
Isoflurane		2	15
Isooctyl alcohol		50	270
Isophorone	78-59-1	25	140
Isophorone; 3,5,5-trimethyl-2-cyclohexene-1-one		4	23
Isophorone diisocyanate; IPDI		0.005	0.045		0.02
Isopropoxyethanol		25	105
Isopropyl acetatesources differ	108-21-4	250	950
Isopropyl alcoholsources differ	67-63-0	400	980
Isopropyl ether	108-20-3	500	2100
Isopropyl ether; diisopropyl ether		250	1,050
Isopropyl glycidyl ether (IGE)	4016-14-2	50	240
Isopropyl glycidyl ether; IGE; 1,2-epoxy-3-isopropoxypropane		50	240		75	360
Isopropylaminesources differ	75-31-0	5	12
Kaolin	1332-58-7
Kaolin; (respirable dust containing no asbestos and <1% crystaline silica)			2
Ketene	463-51-4	0.5	0.9
Ketene; ethenone		0.5	0.9		1.5	3
L.P.G. (Liquefied petroleum gas)	68476-85-7	1000	1800
Lead chromate, as Pb			0.01
Lead, inorganic (as Pb); see 1910.1025	7439-92-1
Lead (metallic) and inorganic compounds, dust and fume, as Pb			0.01
Lead tetraethyl, see Tetraethyl lead
Lead tetramethyl, see Tetramethyl lead
Limestone	1317-65-3
Limestone; calcium carbonate; see Particulates not otherwise regulated
Lindane	58-89-9		0.5
Lindane; 1,2,3,4,5,6-hexachlorocyclohexane, gamma isomer			0.5
Lithium hydridesources differ	7580-67-8		0.025
Lithium stearate			10
m-isomer	99-08-1
m-Phthalodinitrile			5
m-Toluidine		2	9
m-Xylene-a,a′-diamine			0.1	C
Magnesite	546-93-0
Magnesite; magnesium carbonate; see Particulates not otherwise regulated
Magnesium oxide fume	1309-48-4
Magnesium oxide fume, as Mg			10
Magnesium stearate			10
Malathion	121-75-5
Malathion; o,o-dimethyl S-1(1,2-dicarboethyoxyethyl) phosphorodithioate			10
Maleic anhydride	108-31-6	0.25	1
Maleic anhydride; cis-butenedioic anhydride		0.1	0.4
Manganese compounds (as Mn)	7439-96-5		(C)5
Manganese, cyclopentadienyl-tricarbonyl, as Mn			0.1
Manganese fume (as Mn)	7439-96-5		(C)5
Manganese fume, as Mn			0.2			3
Marble	1317-65-3
MDA; see 4,4′-Methylene dianiline
MDI; see Methylene bis(phenylisocyanate)
Mercury alkyls, as Hg			0.01	0.04 mg/M 3		0.03
Mercury (aryl and inorganic) (as Hg)	7439-97-6
Mercury aryl compounds as Hg			0.1	C
Mercury, metallic and inorganic compounds as Hg			0.025	0.1 mg/M 3
Mercury (organo) alkyl compounds (as Hg)	7439-97-6
Mercury (vapor) (as Hg)	7439-97-6
Mesityl oxide	141-79-7	25	100
Mesityl oxide; 4-methyl-3-pentene-2-one		15	60		25	100
Mesitylene; see 1,3,5-Trimethylbenzene
(meta)	99-65-0
Methacrylic acid		20	70
Methane
Methanethiol; see Methyl mercaptan
Methanol; see Methyl alcohol
Methomyl			2.5
Methoxychlor	72-43-5
Methoxychlor; 1,1,1-trichloro-2, 2-bis(p-methoxyphenyl)ethane			10
Methoxyflurane		2	13
Methyl 2-cyanoacrylate		0.2	0.908
Methyl acetatesources differ	79-20-9	200	610
Methyl acetylene (Propyne)	74-99-7	1000	1650
Methyl acetylene; propyne		1,000	1,650
Methyl acrylatesources differ	96-33-3	10	35
Methyl alcohol	67-56-1	200	260
Methyl alcohol; methanol		200	260	1000 ppm	250	325
Methyl amyl alcohol; see Methyl isobutyl carbinol
Methyl bromidesources differ	74-83-9	(C)20	(C)80
Methyl chloridesources differ	74-87-3
Methyl chloroform (1,1,1-Trichloroethane)	71-55-6	350	1900
Methyl chloroform; 1,1,1-trichloroethane		350	1900	800 ppm	450	2450
Methyl chloromethyl ether; see Section 5209
Methyl cyanide; see Acetonitrile
Methyl demeton; a mixture of o,o-dimethyl o-(2-(ethylthio)ethyl) phosphorothioate and o,o-dimethyl S-(2-(ethylthio)-ethyl) phosphorothioate			0.5
Methyl ethyl ketone; MEK; 2-butanone; ethyl methyl ketone		200	590		300	885
Methyl ethyl ketone peroxide		0.2	1.5	C
Methyl formatesources differ	107-31-3	100	250
Methyl hydrazine (Monomethyl hydrazine)	60-34-4	(C)0.2	(C)0.35
Methyl hydrazine; monomethyl hydrazine		0.01	0.019
Methyl iodidesources differ	74-88-4	5	28
Methyl isoamyl ketonesources differ	110-12-3	100	475
Methyl isobutyl carbinol	108-11-2	25	100
Methyl isobutyl carbinol; 4-methyl-2-pentanol; methyl amyl alcohol		25	100		40	165
Methyl isobutyl ketone; Hexone		50	205		75	300
Methyl isocyanatesources differ	624-83-9	0.02	0.05
Methyl isopropyl ketone		200	705
Methyl mercaptansources differ	74-93-1	(C)10	(C)20
Methyl methacrylate	80-62-6	100	410
Methyl methacrylate; methyl 2-methyl-2-propenoate		50	205		100	410
Methyl n-amyl ketone	110-43-0	100	465
Methyl n-amyl ketone; 2-heptanone		50	235
Methyl n-butyl ketone; 2-hexanone		1	4		10	40
Methyl parathion; o,o-dimethyl o-(p-nitrophenyl) phosphorothioate			0.2
Methyl propyl ketone; 2-pentanone		200	700		250	875
Methyl silicate; tetramethyl silicate		1	6
Methyl sulfate; see Dimethyl sulfate
Methyl tert-butyl ether; MTBE		40	144
Methyl vinyl ketone		0.05	0.14	C
Methylal (Dimethoxy-methane)	109-87-5	1000	3100
Methylal; dimethoxymethane		1,000	3,100
Methylaminesources differ	74-89-5	10	12
Methylcyclohexanesources differ	108-87-2	500	2000
Methylcyclohexanol	25639-42-3	100	470
Methylcyclohexanol (meta- and para-isomer mixture)		50	235
Methylene bis(4-cyclohexylisocyanate); hydrogenated MDI		0.005	0.054
Methylene bis(phenylisocyanate); MDI; diphenylmethane diisocyanate		0.005	0.051
Methylene bisphenyl isocyanate (MDI)	101-68-8	(C)0.02	(C)0.2
Methylene chloride	75-09-2
Methylene chloride; dichloromethane (see also section 5202)		25	87		125	435
Metribuzin			5
Mevinphos; 2-carbomethoxyl-1-propen-2-yl dimethyl phosphate		0.01	0.1		0.03	0.3
Mica (respirable dust)sources differ	12001-26-2
Molybdenum (as Mo)	7439-98-7
Molybdenum, insoluble compounds, as Mo			0.5 (n)
Monocrotophos			0.25
Monomethyl aniline	100-61-8	2	9
Monomethylaniline; see N-Methylaniline
Monomethylhydrazine; see Methyl hydrazine
Morpholine	110-91-8	20	70
Morpholine; tetrahydro-4H-1, 4-oxazine		20	70		30	105
Muriatic acid; see Hydrogen chloride
n-Amyl acetate	628-63-7	100	525
n-Amyl acetate; see Pentyl acetate
n-Butyl-acetate	123-86-4	150	710
n-Butyl acetate		150	710		200	950
n-Butyl alcohol	71-36-3	100	300
n-Butyl alcohol; 1-butanol		50	150	C
n-Butyl glycidyl ether (BGE)	2426-08-6	50	270
n-Butyl glycidyl ether; BGE; 1-butoxy-2,3-epoxypropane		25	135
n-Butyl lactate		5	25
n-Butyl mercaptan		0.5	1.5
N-Ethylmorpholine	100-74-3	20	94
N-Ethylmorpholine; 4-ethyl-1, 4-tetrahydrooxazine		5	23
n-Heptane		400	1,600		500	2000
n-Hexanesources differ	110-54-3	500	1800
N-isopropylaniline		2	10
N-Methylaniline; monomethylaniline		0.5	2
N-Methylpyrrolidone (NMP)		1	4
N,N-Dimethylaniline; dimethylphenylamine		5	25		10	50
N,N-Dimethylnitrosamine; see N-Nitrosodimethylamine, Section 5209
N-Nitrosodimethylamine, see Section 5209
n-Propyl acetatesources differ	109-60-4	200	840
n-Propyl alcoholsources differ	71-23-8	200	500
n-Propyl nitratesources differ	627-13-4	25	110
Naled; o,o-dimethyl o-(1,2-dibromo-2,2-dichloroethyl) phosphate			3
Naphtha (Coal tar)	8030-30-6	100	400
Naphtha, coal tar		100	400
Naphthalenesources differ	91-20-3	10	50
Naphthalene diisocyanate; NDI		0.01	0.085	C
Neon
Nickel carbonyl (as Ni)	13463-39-3	0.001	0.007
Nickel carbonyl; Ni (CO) $4		0.001	0.007
Nickel, metal and insoluble compounds (as Ni)	7440-02-0		1
Nickel metal, as Ni			0.5
Nickel, soluble compounds (as Ni)	7440-02-0		1
Nickel subsulfide			.05
Nicotine	54-11-5		0.5
Nicotine; 1-methyl-2-(3-pyridyl)-pyrrolidine		0.075	0.5
Nitrapyrin
Nitric acidsources differ	7697-37-2	2	5
Nitric oxide	10102-43-9	25	30
Nitric oxide; NO		25	30
Nitrobenzenesources differ	98-95-3	1	5
Nitroethanesources differ	79-24-3	100	310
Nitrogen
Nitrogen dioxidesources differ	10102-44-0	(C)5	(C)9
Nitrogen trifluoridesources differ	7783-54-2	10	29
Nitroglycerinsources differ	55-63-0	(C)0.2	(C)2
Nitromethanesources differ	75-52-5	100	250
Nitrotrichloromethane; see Chloropicrin
Nitrous oxide		50	90
Nonane		200	1,050
o-Chlorobenzylidene malononitrile	2698-41-1	0.05	0.4
o-Chlorobenzylidene malononitrile; OCBM		0.05	0.4	C
o-Chlorostyrene		50	285		75	428
o-Chlorotoluene		50	250
o-Dichlorobenzenesources differ	95-50-1	(C)50	(C)300
o-isomer	88-72-2
o-Methylaniline; see o-Toluidine
o-Methylcyclohexanonesources differ	583-60-8	100	460
o,o-Dimethyl o-(1,2-dibromo-2,2-dichloroethyl) phosphate; see Naled
o-sec-Butylphenol		5	30
o-Toluidine	95-53-4	5	22
o-Toluidine; o-methylaniline		2	9
Octachloronaphthalenesources differ	2234-13-1		0.1
Octanesources differ	111-65-9	500	2350
Oil (mineral) mist, particulate			(5) (l)
Oil mist, mineral	8012-95-1		5
(ortho)	528-29-0
Osmium tetroxide (as Os)	20816-12-0		0.002
Osmium tetroxide, as Os		0.0002	0.002		0.0006	0.006
Oxalic acidsources differ	144-62-7		1
Oxygen difluoridesources differ	7783-41-7	0.05	0.1
Ozonesources differ	10028-15-6	0.1	0.2
p-Dichlorobenzene	106-46-7	75	450
p-Dichlorobenzene; 1,4-dichlorobenzene		10	60	200 ppm	110	675
p-Dihydroxybenzene; see Hydroquinone
p-Dioxane;
p-isomer	99-99-0
p-Nitroanilinesources differ	100-01-6	1	6
p-Nitrochlorobenzene	100-00-5		1
p-Nitrochlorobenzene; 1-chloro-4-nitrobenzene		0.1	0.64
p-Phenylene diamine	106-50-3		0.1
p-Phenylenediamine			0.1
p-tert-Butyltoluenesources differ	98-51-1	10	60
p-Toluidine		2	9
(para)	100-25-4
Paraffin wax fume			2
Parathion	56-38-2		0.1
Parathion; o,o-diethyl o-(p-nitrophenyl) phosphorothioate			0.1
PCP; see Pentachlorophenol
Pentaboranesources differ	19624-22-7	0.005	0.01
Pentachloronaphthalenesources differ	1321-64-8		0.5
Pentachlorophenol	87-86-5		0.5
Pentachlorophenol; PCP			0.5
Pentaerythritol	115-77-5
Pentaerythritol; tetrakis-(hydroxymethyl)methane; tetra-methylolmethane; see Particulates not otherwise regulated
Pentanesources differ	109-66-0	1000	2950
Perchloroethane; see Hexachloroethane
Perchloroethylene		25	170	300 ppm	100	685
Perchloroethylene (Tetrachloroethylene)	127-18-4
Perchloromethyl mercaptan	594-42-3	0.1	0.8
Perchloromethyl mercaptan; trichloromethanethiol		0.1	0.8
Perchloryl fluoride	7616-94-6	3	13.5
Perchloryl fluoride; C10 $3 F		3	14		6	28
Perfluoroisobutylene		0.01	0.082	C
Phenolsources differ	108-95-2	5	19
Phenothiazine; dibenzothiazine			5
Phenyl ether, vaporsources differ	101-84-8	1	7
Phenyl glycidyl ether (PGE)	122-60-1	10	60
Phenyl glycidyl ether, PGE; 1,2-epoxy-3-phenoxypropane		0.1	0.6
Phenyl mercaptan		0.5	2
Phenylethylene; see Styrene
Phenylhydrazinesources differ	100-63-0	5	22
Phenylphosphine		0.05	0.25	C
Phorate; o,o-diethyl S-(ethylthio)methyl phosphorodithioate			0.05			0.2
Phosdrin (Mevinphos)	7786-34-7		0.1
Phosgene (Carbonyl chloride)	75-44-5	0.1	0.4
Phosgene; carbonyl chloride; COCl $2		0.1	0.4
Phosphine	7803-51-2	0.3	0.4
Phosphine; PH $3		0.3	0.4		1	1
Phosphoric acidsources differ	7664-38-2		1
Phosphorus oxychloride		0.1	0.6
Phosphorus pentachloridesources differ	10026-13-8		1
Phosphorus pentasulfide	1314-80-3		1
Phosphorus pentasulfide; P $2 S $5			1			3
Phosphorus trichloridesources differ	7719-12-2	0.5	3
Phosphorus (yellow)	7723-14-0		0.1
Phosphorus, yellow			0.1
Phthalic anhydridesources differ	85-44-9	2	12
Picloramsources differ	1918-02-1
Picric acid	88-89-1		0.1
Picric acid; 2,4,6-trinitrophenol			0.1
Pindone (2-Pivalyl-1,3-indandione)	83-26-1		0.1
Pindone; 2-pivalyl-1, 3-indandione			0.1
Piperazine dihydrochloride			5
Plaster of Paris	26499-65-0
Plaster of Paris; calcium sulfate hemihydrate; see Particulates not otherwise regulated
Platinum (as Pt)	7440-06-4
Platinum, metal			1
Portland cement	65997-15-1
Potassium hydroxide; caustic potash			2	C
Potassium stearate			10
Propanesources differ	74-98-6	1000	1800
Propargyl alcohol; 2-propyn-1-o1		1	2
Propionic acid		10	30
Propoxur; 2-isopropoxyphenyl N-methyl carbamate			0.5
Propylene
Propylene dichloride	78-87-5	75	350
Propylene dichloride; 1,2-dichloropropane		75	350		110	510
Propylene glycol dinitrate; PGDN		0.05	0.3
Propylene glycol monomethyl ether		100	360		150	540
Propylene glycol monomethyl ether acetate		100	541		150	811
Propylene imine	75-55-8	2	5
Propylene oxide	75-56-9	100	240
Propylene oxide; 1,2-epoxy-propane		2	4.75
Propyleneimine; 2-methylaziridine		2	5
Propyne; see Methylacetylene
Pyrethrumsources differ	8003-34-7		5
Pyridinesources differ	110-86-1	5	15
Quartz,			0.05
Quartz; see 1910.1053 7	14808-60-7
Quinonesources differ	106-51-4	0.1	0.4
RDX; see Cyclonite
Resorcinol		10	45		20	90
Rhodium (as Rh), metal fume and insoluble compounds	7440-16-6		0.1
Rhodium (as Rh), soluble compounds	7440-16-6		0.001
Rhodium, metal			0.1
Ronnel	299-84-3		15
Ronnel; o,o-dimethyl o-(2,4,5-trichlorophenyl) phosphorothioite			10
Rotenone	83-79-4		5
Rotenone, commercial			5
Rouge; see Particulates not otherwise regulated
sec-Amyl acetate	626-38-0	125	650
sec-Amyl acetate (all isomers and mixtures); see Pentyl acetate
sec-Butyl acetatesources differ	105-46-4	200	950
sec-Butyl alcoholsources differ	78-92-2	150	450
sec-Hexyl acetate	108-84-9	50	300
sec-Hexyl acetate; 4-methyl-2-pentyl acetate; 1,3-dimethyl-butyl acetate		50	300
Selenium compounds (as Se)	7782-49-2		0.2
Selenium hexafluoride		0.05	0.4
Selenium hexafluoride (as Se)	7783-79-1	0.05	0.4
Sesone; sodium 2,4-dichloro-phenoxyethyl sulfate
Silica, amorphous Diatomaceous earth
Silica, amorphous, diatomaceous earth, containing less than 1% crystalline silica	61790-53-2
Silica, amorphous, precipitated and gel	112926-00-8
Silica, fused, respirable dustsources differ	60676-86-0
Silicon	7440-21-3
Silicon carbide	409-21-2
Silicon carbide; SiC; see Particulates not otherwise regulated
Silicon; see Particulates not otherwise regulated
Silicon tetrahydride; silane		5	7
Silver, metal and soluble compounds (as Ag)	7440-22-4		0.01
Silver metal, as Ag			0.01
Sodium 2,4-dichlorophenoxyethyl sulfate; see Sesone
Sodium azide		0.1	0.3	C
Sodium bisulfite			5
Sodium fluoroacetatesources differ	62-74-8		0.05
Sodium hydroxide	1310-73-2		2
Sodium hydroxide; caustic soda			2	C
Sodium metabisulfite			5
Sodium stearate			10
Starch	9005-25-8
Starch; see Particulates not otherwise regulated
Stibine	7803-52-3	0.1	0.5
Stibine; SbH $3		0.1	0.5
Stoddard solventsources differ	8052-41-3	500	2900
Strontium chromate, as Cr (see also Sections 1532.2, 5206 & 8359) Stearates; see specific compound			0.0005
Strychninesources differ	57-24-9		0.15
Styrene	100-42-5
Styrene (monomer); phenylethylene		50	215	500 ppm	100	425
Subtilisins (as pure crystalline proteolytic enzymes)						0.00006 (r)
Sucrose	57-50-1
Sucrose; see Particulates not otherwise regulated
Sulfometuron methyl			3.5
Sulfotep; tetraethyl dithionopyrophosphate			0.2
Sulfur dioxidesources differ	7446-09-5	5	13
Sulfur hexafluoridesources differ	2551-62-4	1000	6000
Sulfur monochloride	10025-67-9	1	6
Sulfur monochloride; S $2 Cl $2		1	6	C
Sulfur pentafluoride	5714-22-7	0.025	0.25
Sulfur pentafluoride; S $2 F $10		0.01	0.1	C
Sulfur tetrafluoride		0.1	0.4	C
Sulfuric acidsources differ	7664-93-9		1
Sulfuryl fluoride	2699-79-8	5	20
Sulfuryl fluoride; SO $2 F $2		5	20		10	40
Sulprofos			1
Talc (containing no asbestos fibers), respirable dust			2
Talc (containing no asbestos), respirable dust	14807-96-6
Tantalum, metal and oxide dust	7440-25-7		5
Tantalum metal dust, as Ta			5
Tantalum oxide dust, as Ta			5
TCP; see Triorthocresyl phosphate
TDI; see Toluene-2,4-diisocyanate
TEDP; see Sulfotep
TEDP (Sulfotep)	3689-24-5		0.2
Tellurium and compounds (as Te)	13494-80-9		0.1
Tellurium hexafluoride		0.02	0.2
Tellurium hexafluoride (as Te)	7783-80-4	0.02	0.2
Temephos	3383-96-8
Temephos; o,o,o′ ,o′-tetramethyl o,o′-thiodi-p-phenylene phosphorothioate Total dust			10
TEPP (Tetraethyl pyrophosphate)	107-49-3		0.05
TEPP; tetraethyl pyrophosphate;		0.004	0.05
Terephthalic acid			10
Terphenyls	26140-60-3	(C)1	(C)9
tert-Amyl acetate; see Pentyl acetate
tert-Butyl acetatesources differ	540-88-5	200	950
tert-Butyl alcoholsources differ	75-65-0	100	300
tert-Butyl chromate (as CrO 3 ); see 1910.1026 6	1189-85-1
tert-Butyl chromate; di-tert-butyl Chromate, as CrO $3			0.1	C
Tetrachloroethylene; see Perchloroethylene
Tetrachloromethane; see Carbon tetrachloride
Tetrachloronaphthalenesources differ	1335-88-2		2
Tetraethyl dithionopyrophosphate; see Sulfotep
Tetraethyl lead (as Pb)	78-00-2		0.075
Tetraethyl lead; tetraethylplumbane, as Pb			0.075
Tetraethyl pyrophosphate; see TEPP
Tetrahydrofuransources differ	109-99-9	200	590
Tetramethyl lead (as Pb)	75-74-1		0.075
Tetramethyl lead; tetramethylplumbane, as Pb			0.075
Tetramethyl succinonitrile	3333-52-6	0.5	3
Tetramethyl succinonitrile (decomposition product of 2,2′-azobisisobutyronitrile)		0.5	3
Tetramethyl thiuram disulfide, see Thiram
Tetramethylolmethane; see Pentaerythritol
Tetranitromethanesources differ	509-14-8	1	8
Tetrasodium pyrophosphate			5
Tetryl (2,4,6-Trinitrophenylmethylnitramine)	479-45-8		1.5
Tetryl; 2,4,6-trinitrophenylmethylnitramine			1.5
Thallium, soluble compounds (as Tl)	7440-28-0		0.1
THF; see Tetrahydrofuran
Thioglycolic acid		1	3.8
Thionyl chloride		1	5	C
Thiram	137-26-8		5
Thiram; bis(dimethylthiocarbamoyl) disulfide			5
Tin, inorganic compounds (except oxides) (as Sn)	7440-31-5		2
Tin, organic compounds (as Sn)	7440-31-5		0.1
Tin, tin oxide and inorganic compounds, except SnH $4 , as Sn			2
Titanium dioxide	13463-67-7
Titanium dioxide, as Ti; see Particulates not otherwise regulated
TMTD; see Thiram
TNT; see 2,4,6-Trinitrotoluene
Toluene	108-88-3
Toluene-2,4-diisocyanate (TDI)	584-84-9	(C)0.02	(C)0.14
Toluene-2,4-diisocyanate; TDI		0.005	0.04	0.02 ppm	0.02	0.15
Toluene; toluol		10	37	500 ppm	150	560
Toxaphene; see Chlorinated camphene
Tpp; see Triphenyl phosphate
Tribromomethane; see Bromoform
Tributyl phosphatesources differ	126-73-8		5
Trichloroacetic acid		1	5
Trichloroethylene	79-01-6
Trichloroethylene; trichloro-ethene		25	135	300 ppm	100	537
Trichlorofluoromethane; Fluorocarbon 11		1,000	5,600	C
Trichloromethane; see Chloroform
Trichloromethanethiol; see Perchloromethyl mercaptan
Trichloronaphthalenesources differ	1321-65-9		5
Trichloronitromethane; see Chloropicrin
Tricresyl phosphate; see Triorthocresyl phosphate
Tricyclohexyltin hydroxide; see Cyhexatin
Tridymite,			0.05
Tridymite; see 1910.1053 7	15468-32-3
Triethanolamine			5
Triethylaminesources differ	121-44-8	25	100
Triethylene glycol dimethyl ether, Triglyme		5	36
Trifluorobromomethanesources differ	75-63-8	1000	6100
Trimellitic anhydride		0.005	0.04	C
Trimethyl phosphite		2	10
Trimethylamine		5	12		15	36
Triorthocresyl phosphatesources differ	78-30-8		0.1
Triphenyl phosphate	115-86-6		3
Triphenyl phosphate; TPP			3
Triphenylamine			5
Tripoli, (as quartz)			0.05
Tripoli (as quartz); see 1910.1053 7	1317-95-9
Tungsten metal, as W			5
Turpentinesources differ	8006-64-2	100	560
Uranium (as U)	7440-61-1
Valeraldehyde		50	175
Vanadium	1314-62-1
Vanadium pentoxide (V $2 O $5 ), respirable dust and fume			0.05
VC; see Vinyl chloride, Section 5210
Vinyl acetate		10	30		15	45
Vinyl bromide; bromoethylene		0.1	0.44
Vinyl chloride; see 1910.1017	75-01-4
Vinyl chloride, see Section 5210		1
Vinyl cyanide, see Acrylonitrile, Section 5213
Vinyl cyclohexene dioxide		0.1	0.57
Vinyl fluoride		0.2	0.38
Vinyl toluene	25013-15-4	100	480
Vinylbenzene; see Styrene
Vinylidene chloride; 1,1-dichloroethylene		1	4
Vinylidene fluoride		100	262
Vinyltoluene		50	240
VM & P (Varnish Makers and Painters) Naphtha		300	1,350		400	1800
Warfarin	81-81-2		0.1
Warfarin; 3-(alpha-acetonyl-benzyl)-4-hydroxycoumarin			0.1
Xylene; xylol; dimethylbenzene		100	435	300 ppm	150	655
Xylenes (o-, m-, p-isomers)	1330-20-7	100	435
Xylidine	1300-73-8	5	25
Xylidine; aminodimethylbenzene		0.5	2.5
Yttrium	7440-65-5		1
Zinc chloride fumesources differ	7646-85-7		1
Zinc chromate, as Cr			0.005
Zinc chromate hydroxide, as Cr			0.005
Zinc oxide	1314-13-2
Zinc oxide fumesources differ	1314-13-2		5
Zinc potassium chromate, as Cr			0.005
Zinc stearatesources differ	557-05-1
Zinc yellow, as Cr			0.005
Zirconium compounds (as Zr)	7440-67-7		5

Where this came from

Every record above links the page it was taken from and quotes the sentence that states it. These are the 2 sources this dataset was assembled from.

osha.govhttps://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1
dir.ca.govhttps://www.dir.ca.gov/title8/5155.html

Machine-readable

data.jsonThe whole dataset — every record with its source URL and source quote.
Open Knowledge Format bundleOne file per record, frontmatter plus the quoted span, exactly as it is held here.
How this is made and checkedWhat "verified against source" does and does not mean.

1,031 records. Licence: US and California government works — public domain. ACGIH TLVs deliberately excluded (copyrighted). NIOSH RELs excluded: obtainable only second-hand.. Last verified against source: 2026-08-05. Scheduled for re-check by: 2027-08-05.