# n-Valeraldehyde — workplace exposure limit

For n-Valeraldehyde, niosh rel (ppm) is TWA 50; niosh rel (mg/m³) is 175; cas no. is 110-62-3, verified against its source on 2026-09-08.

- **Substance:** n-Valeraldehyde _(verified: appears in its own passage below)_
- **CAS No.:** 110-62-3 _(verified: appears in its own passage below)_
- **NIOSH REL (ppm):** TWA 50 _(verified: appears in the quote below)_
- **NIOSH REL (mg/m³):** 175 _(verified: appears in the quote below)_
- **PEL (ppm):** 50 _(per dir.ca.gov, not stated by the source above)_
- **PEL (mg/m³):** 175 _(per dir.ca.gov, not stated by the source above)_

## What the source says

> NIOSH REL TWA 50 ppm (175 mg/m3)

## 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 - n-Valeraldehyde

### CAS No.

> CAS No. 110-62-3

## What dir.ca.gov says

> 110623 | | Valeraldehyde | 50 | 175

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

## Source

- https://www.cdc.gov/niosh/npg/npgd0652.html
- https://www.dir.ca.gov/title8/5155.html

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/).