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

For Tetranitromethane, cas no. is 509-14-8; pel (ppm) is 1; pel (mg/m³) is 8, verified against its source on 2026-08-05.

- **Substance:** Tetranitromethane
- **CAS No.:** 509-14-8
- **PEL (ppm):** 1
- **PEL (mg/m³):** 8

## What the source says

> Tetranitromethane | 509-14-8 | 1 | 8 | - |

## 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 **1**, as of 2026-08-05.

> Tetranitromethane | 509-14-8 | 1 | 8 | - |

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

dir.ca.gov says pel (ppm) is **0.005**, as of 2026-08-05.

> 509148 | | Tetranitromethane | 0.005 | 0.04

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


### PEL (mg/m³)

osha.gov says pel (mg/m³) is **8**, as of 2026-08-05.

> Tetranitromethane | 509-14-8 | 1 | 8 | - |

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

dir.ca.gov says pel (mg/m³) is **0.04**, as of 2026-08-05.

> 509148 | | Tetranitromethane | 0.005 | 0.04

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/).