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

For Phosphoric acid, cas no. is 7664-38-2; pel (mg/m³) is 1, verified against its source on 2026-08-05.

- **Substance:** Phosphoric acid
- **CAS No.:** 7664-38-2
- **PEL (mg/m³):** 1

## What the source says

> Phosphoric acid | 7664-38-2 | - | 1 | - |

## Source

- https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1
- 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/).