---
type: threshold
id: mercury-metallic-and-inorganic-compounds-as-hg
asset: workplace-exposure-limits
title: "Mercury, metallic and inorganic compounds as Hg — US workplace chemical exposure limits: federal OSHA vs Cal/OSHA, side by side"
sources:
  - https://www.dir.ca.gov/title8/5155.html
source_quote: "7439976 | S | Mercury, metallic and inorganic compounds as Hg | -- | 0.025 | 0.1 mg/M 3"
generated: true
harvested: 2026-08-05
stale_after: 2027-08-05
substance: "Mercury, metallic and inorganic compounds as Hg"
pel_mgm3: "0.025"
ceiling: "0.1 mg/M 3"
verified: true
---
**Substance:** Mercury, metallic and inorganic compounds as Hg

**PEL (mg/m³):** 0.025

**Ceiling:** 0.1 mg/M 3

> 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>