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

For Propane, cas no. is 74-98-6; pel (ppm) is 1000; pel (mg/m³) is 1800, verified against its source on 2026-08-05.

- **Substance:** Propane
- **CAS No.:** 74-98-6
- **PEL (ppm):** 1000
- **PEL (mg/m³):** 1800

## What the source says

> Propane | 74-98-6 | 1000 | 1800 | - |

## 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 (mg/m³)

osha.gov says pel (mg/m³) is **1800**, as of 2026-08-05.

> Propane | 74-98-6 | 1000 | 1800 | - |

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

dir.ca.gov says pel (mg/m³) is **1800 (h)**, as of 2026-08-05.

> 74986 | | Propane | 1000 | 1800 (h)

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/).