# Mercury, metallic and inorganic compounds as Hg — US workplace chemical exposure limits: federal OSHA vs Cal/OSHA, side by side

For Mercury, metallic and inorganic compounds as Hg, pel (mg/m³) is 0.025; ceiling is 0.1 mg/M 3, verified against its source on 2026-08-05.

- **Substance:** Mercury, metallic and inorganic compounds as Hg
- **PEL (mg/m³):** 0.025
- **Ceiling:** 0.1 mg/M 3

## What the source says

> 7439976 | S | Mercury, metallic and inorganic compounds as Hg | -- | 0.025 | 0.1 mg/M 3

## 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/).