# Trimethylbenzene, all isomers — workplace exposure limit

For Trimethylbenzene, all isomers, pel (ppm) is 25; pel (mg/m³) is 125, verified against its source on 2026-09-29.

- **Substance:** Trimethylbenzene, all isomers _(verified: appears in the quote below)_
- **PEL (ppm):** 25 _(verified: appears in the quote below)_
- **PEL (mg/m³):** 125 _(verified: appears in the quote below)_

## What the source says

> Trimethylbenzene, all isomers | 25 | 125

## Source

- https://www.dir.ca.gov/title8/5155.html

Last verified: 2026-09-29. Review by: 2027-09-29.
Part of [US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side](https://referencesource.org/workplace-exposure-limits/).