# Hexachlorocyclopentadiene — US workplace chemical exposure limits: federal OSHA vs Cal/OSHA, side by side

For Hexachlorocyclopentadiene, pel (ppm) is 0.01; pel (mg/m³) is 0.11, verified against its source on 2026-08-05.

- **Substance:** Hexachlorocyclopentadiene
- **PEL (ppm):** 0.01
- **PEL (mg/m³):** 0.11

## What the source says

> 77474 | | Hexachlorocyclopentadiene | 0.01 | 0.11

## 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/).