---
type: threshold
id: manganese-fume-as-mn-2
asset: workplace-exposure-limits
title: "Manganese fume, as Mn — US workplace chemical exposure limits: federal OSHA vs Cal/OSHA, side by side"
sources:
  - https://www.dir.ca.gov/title8/5155.html
source_quote: "7439965 | | Manganese fume, as Mn | -- | 0.2 | | -- | 3"
generated: true
harvested: 2026-08-05
stale_after: 2027-08-05
substance: "Manganese fume, as Mn"
pel_mgm3: "0.2"
stel_mgm3: "3"
verified: true
---
**Substance:** Manganese fume, as Mn

**PEL (mg/m³):** 0.2

**STEL (mg/m³):** 3

> 7439965 | | Manganese fume, as Mn | -- | 0.2 | | -- | 3

Source: <https://www.dir.ca.gov/title8/5155.html>