---
type: threshold
id: mesityl-oxide
asset: workplace-exposure-limits
title: "Mesityl oxide — US workplace chemical exposure limits: federal OSHA vs Cal/OSHA, side by side"
sources:
  - https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1
source_quote: "Mesityl oxide | 141-79-7 | 25 | 100 | - |"
generated: true
harvested: 2026-08-05
stale_after: 2027-08-05
substance: "Mesityl oxide"
cas_number: "141-79-7"
pel_ppm: "25"
pel_mgm3: "100"
verified: true
---
**Substance:** Mesityl oxide

**CAS No.:** 141-79-7

**PEL (ppm):** 25

**PEL (mg/m³):** 100

> Mesityl oxide | 141-79-7 | 25 | 100 | - |

Source: <https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1>