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

For Hydrogen, substance is Hydrogen, verified against its source on 2026-08-05.

- **Substance:** Hydrogen

## What the source says

> 1333740 | | Hydrogen | (h) | --

## 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/).