---
type: threshold
id: magnesium-oxide-fume-as-mg
asset: workplace-exposure-limits
title: "Magnesium oxide fume, as Mg — US workplace chemical exposure limits: federal OSHA vs Cal/OSHA, side by side"
sources:
  - https://www.dir.ca.gov/title8/5155.html
source_quote: "1309484 | | Magnesium oxide fume, as Mg | -- | 10"
generated: true
harvested: 2026-08-05
stale_after: 2027-08-05
substance: "Magnesium oxide fume, as Mg"
pel_mgm3: "10"
verified: true
---
**Substance:** Magnesium oxide fume, as Mg

**PEL (mg/m³):** 10

> 1309484 | | Magnesium oxide fume, as Mg | -- | 10

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