Methyl parathion — workplace exposure limit
What is the niosh rel (mg/m³) for Methyl parathion — workplace exposure limit?
For Methyl parathion, niosh rel (mg/m³) is TWA 0.2; cas no. is 298-00-0, verified against its source on 2026-09-08.
NIOSH REL TWA 0.2 mg/m3 [skin]
— cdc.gov, retrieved 2026-09-08
- Substance
- Methyl parathion verified
- CAS No.
- 298-00-0 verified
- NIOSH REL (mg/m³)
- TWA 0.2 verified
- PEL (mg/m³)
- 0.2 per dir.ca.gov
Where each value comes from
This source states these in separate places, so each value is shown with the passage that states it.
Substance
CDC - NIOSH Pocket Guide to Chemical Hazards - Methyl parathion
CAS No.
CAS No. 298-00-0
— all from cdc.gov, retrieved 2026-09-08
What dir.ca.gov says
298000 | S | Methyl parathion; o,o-dimethyl o-(p-nitrophenyl) phosphorothioate | -- | 0.2
— dir.ca.gov, retrieved 2026-08-05
Sources
- cdc.govhttps://www.cdc.gov/niosh/npg/npgd0427.html
- dir.ca.govhttps://www.dir.ca.gov/title8/5155.html