---
type: threshold
id: phosphine-ph-3
asset: workplace-exposure-limits
title: "Phosphine; PH $3 — US workplace chemical exposure limits: federal OSHA vs Cal/OSHA, side by side"
sources:
  - https://www.dir.ca.gov/title8/5155.html
source_quote: "7803512 | | Phosphine; PH $3 | 0.3 | 0.4 | | 1 | 1"
generated: true
harvested: 2026-08-05
stale_after: 2027-08-05
substance: "Phosphine; PH $3"
pel_ppm: "0.3"
pel_mgm3: "0.4"
stel_ppm: "1"
stel_mgm3: "1"
verified: true
---
**Substance:** Phosphine; PH $3

**PEL (ppm):** 0.3

**PEL (mg/m³):** 0.4

**STEL (ppm):** 1

**STEL (mg/m³):** 1

> 7803512 | | Phosphine; PH $3 | 0.3 | 0.4 | | 1 | 1

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