# Perchloromethyl mercaptan; trichloromethanethiol — US workplace chemical exposure limits: federal OSHA vs Cal/OSHA, side by side

For Perchloromethyl mercaptan; trichloromethanethiol, pel (ppm) is 0.1; pel (mg/m³) is 0.8, verified against its source on 2026-08-05.

- **Substance:** Perchloromethyl mercaptan; trichloromethanethiol
- **PEL (ppm):** 0.1
- **PEL (mg/m³):** 0.8

## What the source says

> 594423 | | Perchloromethyl mercaptan; trichloromethanethiol | 0.1 | 0.8

## 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/).