---
type: threshold
id: beta-propiolactone-see-section-5209
asset: workplace-exposure-limits
title: "beta-Propiolactone, see Section 5209 — US workplace chemical exposure limits: federal OSHA vs Cal/OSHA, side by side"
sources:
  - https://www.dir.ca.gov/title8/5155.html
source_quote: "57578 | | beta-Propiolactone, see Section 5209 | 0.5 | 1.5"
generated: true
harvested: 2026-08-05
stale_after: 2027-08-05
substance: "beta-Propiolactone, see Section 5209"
pel_ppm: "0.5"
pel_mgm3: "1.5"
verified: true
---
**Substance:** beta-Propiolactone, see Section 5209

**PEL (ppm):** 0.5

**PEL (mg/m³):** 1.5

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

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