# 2-Pentanone — workplace exposure limit

For 2-Pentanone, niosh rel (ppm) is TWA 150; niosh rel (mg/m³) is 530; cas no. is 107-87-9, verified against its source on 2026-09-08.

- **Substance:** 2-Pentanone _(verified: appears in its own passage below)_
- **CAS No.:** 107-87-9 _(verified: appears in its own passage below)_
- **NIOSH REL (ppm):** TWA 150 _(verified: appears in the quote below)_
- **NIOSH REL (mg/m³):** 530 _(verified: appears in the quote below)_

## What the source says

> NIOSH REL TWA 150 ppm (530 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 - 2-Pentanone

### CAS No.

> CAS No. 107-87-9

## Source

- https://www.cdc.gov/niosh/npg/npgd0488.html

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