---
type: threshold
id: isophorone-3-5-5-trimethyl-2-cyclohexene-1-one
asset: workplace-exposure-limits
title: "Isophorone; 3,5,5-trimethyl-2-cyclohexene-1-one — US workplace chemical exposure limits: federal OSHA vs Cal/OSHA, side by side"
sources:
  - https://www.dir.ca.gov/title8/5155.html
source_quote: "78591 | | Isophorone; 3,5,5-trimethyl-2-cyclohexene-1-one | 4 | 23"
generated: true
harvested: 2026-08-05
stale_after: 2027-08-05
substance: "Isophorone; 3,5,5-trimethyl-2-cyclohexene-1-one"
pel_ppm: "4"
pel_mgm3: "23"
verified: true
---
**Substance:** Isophorone; 3,5,5-trimethyl-2-cyclohexene-1-one

**PEL (ppm):** 4

**PEL (mg/m³):** 23

> 78591 | | Isophorone; 3,5,5-trimethyl-2-cyclohexene-1-one | 4 | 23

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