# alpha-Naphthylamine — workplace exposure limit

For alpha-Naphthylamine, niosh rel, as stated is Ca See Appendix A; cas no. is 134-32-7, verified against its source on 2026-09-08.

- **Substance:** alpha-Naphthylamine _(verified: appears in its own passage below)_
- **CAS No.:** 134-32-7 _(verified: appears in its own passage below)_
- **NIOSH REL, as stated:** Ca See Appendix A _(verified: appears in the quote below)_

## What the source says

> NIOSH REL Ca See Appendix A

## Where each value comes from

This source states these in separate places, so each value is shown with the passage that states it.

### Substance

> CDC - NIOSH Pocket Guide to Chemical Hazards - alpha-Naphthylamine

### CAS No.

> CAS No. 134-32-7

## What dir.ca.gov says

> 134327 | | alpha-Naphthylamine; 1-naphthylamine, see Section 5209

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

## What osha.gov says

> alpha-Naphthylamine; see 1910.1004 | 134-32-7 | - | - | - |

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

## Source

- https://www.cdc.gov/niosh/npg/npgd0441.html
- https://www.dir.ca.gov/title8/5155.html
- https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1

Last verified: 2026-09-08. Review by: 2027-08-05.
Part of [US workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side](https://referencesource.org/workplace-exposure-limits/).