---
type: threshold
id: carbon-monoxide
asset: workplace-exposure-limits
title: "Carbon monoxide — US workplace chemical exposure limits: federal OSHA vs Cal/OSHA, side by side"
sources:
  - https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1
source_quote: "Carbon monoxide | 630-08-0 | 50 | 55 | - |"
generated: true
harvested: 2026-08-05
stale_after: 2027-08-05
substance: "Carbon monoxide"
cas_number: "630-08-0"
pel_ppm: "50"
pel_mgm3: "55"
verified: true
---
**Substance:** Carbon monoxide

**CAS No.:** 630-08-0

**PEL (ppm):** 50

**PEL (mg/m³):** 55

> Carbon monoxide | 630-08-0 | 50 | 55 | - |

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