# Methyl parathion; o,o-dimethyl o-(p-nitrophenyl) phosphorothioate — US workplace chemical exposure limits: federal OSHA vs Cal/OSHA, side by side

For Methyl parathion; o,o-dimethyl o-(p-nitrophenyl) phosphorothioate, pel (mg/m³) is 0.2, verified against its source on 2026-08-05.

- **Substance:** Methyl parathion; o,o-dimethyl o-(p-nitrophenyl) phosphorothioate
- **PEL (mg/m³):** 0.2

## What the source says

> 298000 | S | Methyl parathion; o,o-dimethyl o-(p-nitrophenyl) phosphorothioate | -- | 0.2

## Source

- https://www.dir.ca.gov/title8/5155.html

Last verified: 2026-08-05. Review by: 2027-08-05.
Part of [US workplace chemical exposure limits: federal OSHA vs Cal/OSHA, side by side](https://referencesource.org/workplace-exposure-limits/).