# Nickel carbonyl; Ni (CO) $4 — US workplace chemical exposure limits: federal OSHA vs Cal/OSHA, side by side

For Nickel carbonyl; Ni (CO) $4, pel (ppm) is 0.001; pel (mg/m³) is 0.007, verified against its source on 2026-08-05.

- **Substance:** Nickel carbonyl; Ni (CO) $4
- **PEL (ppm):** 0.001
- **PEL (mg/m³):** 0.007

## What the source says

> 13463393 | | Nickel carbonyl; Ni (CO) $4 | 0.001 | 0.007

## Source

- 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/).