---
type: threshold
id: epn-o-ethyl-o-p-nitrophenyl-phenylphosphonothioate
asset: workplace-exposure-limits
title: "EPN; o-ethyl o-(p-nitrophenyl) phenylphosphonothioate — US workplace chemical exposure limits: federal OSHA vs Cal/OSHA, side by side"
sources:
  - https://www.dir.ca.gov/title8/5155.html
source_quote: "2104645 | S | EPN; o-ethyl o-(p-nitrophenyl) phenylphosphonothioate | -- | 0.1"
generated: true
harvested: 2026-08-05
stale_after: 2027-08-05
substance: "EPN; o-ethyl o-(p-nitrophenyl) phenylphosphonothioate"
pel_mgm3: "0.1"
verified: true
---
**Substance:** EPN; o-ethyl o-(p-nitrophenyl) phenylphosphonothioate

**PEL (mg/m³):** 0.1

> 2104645 | S | EPN; o-ethyl o-(p-nitrophenyl) phenylphosphonothioate | -- | 0.1

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