# Propylene oxide; 1,2-epoxy-propane — US workplace chemical exposure limits: federal OSHA vs Cal/OSHA, side by side

For Propylene oxide; 1,2-epoxy-propane, pel (ppm) is 2; pel (mg/m³) is 4.75, verified against its source on 2026-08-05.

- **Substance:** Propylene oxide; 1,2-epoxy-propane
- **PEL (ppm):** 2
- **PEL (mg/m³):** 4.75

## What the source says

> 75569 | | Propylene oxide; 1,2-epoxy-propane | 2 | 4.75

## 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/).