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

For o-Dichlorobenzene, cas no. is 95-50-1; pel (ppm) is (C)50; pel (mg/m³) is (C)300, verified against its source on 2026-08-05.

- **Substance:** o-Dichlorobenzene
- **CAS No.:** 95-50-1
- **PEL (ppm):** (C)50
- **PEL (mg/m³):** (C)300

## What the source says

> o-Dichlorobenzene | 95-50-1 | (C)50 | (C)300 | - |

## 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)50**, as of 2026-08-05.

> o-Dichlorobenzene | 95-50-1 | (C)50 | (C)300 | - |

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

dir.ca.gov says pel (ppm) is **25**, as of 2026-08-05.

> 95501 | S | o-Dichlorobenzene | 25 | 150 | 50 ppm

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


### PEL (mg/m³)

osha.gov says pel (mg/m³) is **(C)300**, as of 2026-08-05.

> o-Dichlorobenzene | 95-50-1 | (C)50 | (C)300 | - |

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

dir.ca.gov says pel (mg/m³) is **150**, as of 2026-08-05.

> 95501 | S | o-Dichlorobenzene | 25 | 150 | 50 ppm

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/).