# Nitrous oxide — US workplace chemical exposure limits: federal OSHA vs Cal/OSHA, side by side

For Nitrous oxide, pel (ppm) is 50; pel (mg/m³) is 90, verified against its source on 2026-08-05.

- **Substance:** Nitrous oxide
- **PEL (ppm):** 50
- **PEL (mg/m³):** 90

## What the source says

> 0024972 | | Nitrous oxide | 50 | 90

## Source

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

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