# Ethylene glycol — workplace exposure limit

For Ethylene glycol, niosh rel, as stated is See Appendix D; cas no. is 107-21-1, verified against its source on 2026-09-08.

- **Substance:** Ethylene glycol _(verified: appears in its own passage below)_
- **CAS No.:** 107-21-1 _(verified: appears in its own passage below)_
- **NIOSH REL, as stated:** See Appendix D _(verified: appears in the quote below)_
- **PEL (ppm):** 40 _(per dir.ca.gov, not stated by the source above)_
- **PEL (mg/m³):** 100 _(per dir.ca.gov, not stated by the source above)_
- **Ceiling:** C _(per dir.ca.gov, not stated by the source above)_

## What the source says

> NIOSH REL See Appendix D

## 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 - Ethylene glycol

### CAS No.

> CAS No. 107-21-1

## What dir.ca.gov says

> 107211 | | Ethylene glycol (vapor) | 40 | 100 | C

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

## Source

- https://www.cdc.gov/niosh/npg/npgd0272.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/).