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

For Ethyl mercaptan; ethanethiol, pel (ppm) is 0.5; pel (mg/m³) is 1, verified against its source on 2026-08-05.

- **Substance:** Ethyl mercaptan; ethanethiol
- **PEL (ppm):** 0.5
- **PEL (mg/m³):** 1

## What the source says

> 75081 | | Ethyl mercaptan; ethanethiol | 0.5 | 1

## 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/).