# beta-Propiolactone, see Section 5209 — US workplace chemical exposure limits: federal OSHA vs Cal/OSHA, side by side

For beta-Propiolactone, see Section 5209, pel (ppm) is 0.5; pel (mg/m³) is 1.5, verified against its source on 2026-08-05.

- **Substance:** beta-Propiolactone, see Section 5209
- **PEL (ppm):** 0.5
- **PEL (mg/m³):** 1.5

## What the source says

> 57578 | | beta-Propiolactone, see Section 5209 | 0.5 | 1.5

## 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/).