# Endosulfan — workplace exposure limit

For Endosulfan, niosh rel (mg/m³) is TWA 0.1; cas no. is 115-29-7, verified against its source on 2026-09-08.

- **Substance:** Endosulfan _(verified: appears in its own passage below)_
- **CAS No.:** 115-29-7 _(verified: appears in its own passage below)_
- **NIOSH REL (mg/m³):** TWA 0.1 _(verified: appears in the quote below)_
- **PEL (mg/m³):** 0.1 _(per dir.ca.gov, not stated by the source above)_

## What the source says

> NIOSH REL TWA 0.1 mg/m3 [skin]

## 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 - Endosulfan

### CAS No.

> CAS No. 115-29-7

## What dir.ca.gov says

> 115297 | S | Endosulfan; 6,7,8,9,10,10-hexachloro-1,5,5a,6,9,9a-hexahydro-6,9-methano-2,4, 3-benzodioxathiepin-3-oxide | -- | 0.1

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

## Source

- https://www.cdc.gov/niosh/npg/npgd0251.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/).