---
type: threshold
id: methyl-parathion-o-o-dimethyl-o-p-nitrophenyl-phosphorothioate
asset: workplace-exposure-limits
title: "Methyl parathion; o,o-dimethyl o-(p-nitrophenyl) phosphorothioate — US workplace chemical exposure limits: federal OSHA vs Cal/OSHA, side by side"
sources:
  - https://www.dir.ca.gov/title8/5155.html
source_quote: "298000 | S | Methyl parathion; o,o-dimethyl o-(p-nitrophenyl) phosphorothioate | -- | 0.2"
generated: true
harvested: 2026-08-05
stale_after: 2027-08-05
substance: "Methyl parathion; o,o-dimethyl o-(p-nitrophenyl) phosphorothioate"
pel_mgm3: "0.2"
verified: true
---
**Substance:** Methyl parathion; o,o-dimethyl o-(p-nitrophenyl) phosphorothioate

**PEL (mg/m³):** 0.2

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

Source: <https://www.dir.ca.gov/title8/5155.html>