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

For Trichloronaphthalene, cas no. is 1321-65-9; pel (mg/m³) is 5, verified against its source on 2026-08-05.

- **Substance:** Trichloronaphthalene
- **CAS No.:** 1321-65-9
- **PEL (mg/m³):** 5

## What the source says

> Trichloronaphthalene | 1321-65-9 | - | 5 | X |

## Source

- https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1
- 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/).