Heptachlor — workplace exposure limit
What is the pel (mg/m³) for Heptachlor — workplace exposure limit?
For Heptachlor, pel (mg/m³) is 0.5; cas no. is 76-44-8, verified against its source on 2026-08-05.
Heptachlor | 76-44-8 | - | 0.5 | X |
— osha.gov, retrieved 2026-08-05
- Substance
- Heptachlor verified
- CAS No.
- 76-44-8 verified
- PEL (mg/m³)
- 0.5 verified
- NIOSH REL (mg/m³)
- TWA 0.5 per cdc.gov
What cdc.gov says
NIOSH REL Ca TWA 0.5 mg/m3 [skin]
— cdc.gov, retrieved 2026-09-08
Sources disagree
More than one authority states this, and they do not state the same thing. Both are reproduced with the source each came from — deciding between them is yours, not ours.
PEL (mg/m³)
osha.gov says pel (mg/m³) is 0.5, as of 2026-08-05.
Heptachlor | 76-44-8 | - | 0.5 | X |
https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1
dir.ca.gov says pel (mg/m³) is 0.05, as of 2026-08-05.
76448 | S | Heptachlor; 1,4,5,6,7,8,8-hepta-chloro-3a,4,7,7a-tetrahydro-4,7-methanoindene | -- | 0.05
Sources
- osha.govhttps://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1
- dir.ca.govhttps://www.dir.ca.gov/title8/5155.html
- cdc.govhttps://www.cdc.gov/niosh/npg/npgd0311.html