# Naphtha, coal tar — US workplace chemical exposure limits: federal OSHA vs Cal/OSHA, side by side

For Naphtha, coal tar, pel (ppm) is 100; pel (mg/m³) is 400, verified against its source on 2026-08-05.

- **Substance:** Naphtha, coal tar
- **PEL (ppm):** 100
- **PEL (mg/m³):** 400

## What the source says

> 8030317 | | Naphtha, coal tar | 100 | 400

## Source

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

Last verified: 2026-08-05. Review by: 2027-08-05.
Part of [US workplace chemical exposure limits: federal OSHA vs Cal/OSHA, side by side](https://referencesource.org/workplace-exposure-limits/).