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

For Chlorine, cas no. is 7782-50-5; pel (ppm) is (C)1; pel (mg/m³) is (C)3, verified against its source on 2026-08-05.

- **Substance:** Chlorine
- **CAS No.:** 7782-50-5
- **PEL (ppm):** (C)1
- **PEL (mg/m³):** (C)3

## What the source says

> Chlorine | 7782-50-5 | (C)1 | (C)3 | - |

## Sources disagree

More than one authority states this, and they do not state the same
thing. Both are reproduced with the source each came from.

### PEL (ppm)

osha.gov says pel (ppm) is **(C)1**, as of 2026-08-05.

> Chlorine | 7782-50-5 | (C)1 | (C)3 | - |

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

dir.ca.gov says pel (ppm) is **0.5**, as of 2026-08-05.

> 7782505 | | Chlorine | 0.5 | 1.5 | | 1 | 3

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


### PEL (mg/m³)

osha.gov says pel (mg/m³) is **(C)3**, as of 2026-08-05.

> Chlorine | 7782-50-5 | (C)1 | (C)3 | - |

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

dir.ca.gov says pel (mg/m³) is **1.5**, as of 2026-08-05.

> 7782505 | | Chlorine | 0.5 | 1.5 | | 1 | 3

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


## 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/).