# Phosphine; PH $3 — US workplace chemical exposure limits: federal OSHA vs Cal/OSHA, side by side

For Phosphine; PH $3, pel (ppm) is 0.3; pel (mg/m³) is 0.4; stel (ppm) is 1; stel (mg/m³) is 1, verified against its source on 2026-08-05.

- **Substance:** Phosphine; PH $3
- **PEL (ppm):** 0.3
- **PEL (mg/m³):** 0.4
- **STEL (ppm):** 1
- **STEL (mg/m³):** 1

## What the source says

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

## 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/).