Carbon monoxide
For Carbon monoxide, cas no. is 630-08-0; pel (ppm) is 50; pel (mg/m³) is 55, verified against its source on 2026-08-05.
- Substance
- Carbon monoxide
- CAS No.
- 630-08-0
- PEL (ppm)
- 50
- PEL (mg/m³)
- 55
What the source says
Carbon monoxide | 630-08-0 | 50 | 55 | - |
— osha.gov, retrieved 2026-08-05
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 — deciding between them is yours, not ours.
PEL (ppm)
osha.gov says pel (ppm) is 50, as of 2026-08-05.
Carbon monoxide | 630-08-0 | 50 | 55 | - |
https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1
dir.ca.gov says pel (ppm) is 25, as of 2026-08-05.
630080 | | Carbon monoxide | 25 | 29 | 200 ppm
https://www.dir.ca.gov/title8/5155.html
PEL (mg/m³)
osha.gov says pel (mg/m³) is 55, as of 2026-08-05.
Carbon monoxide | 630-08-0 | 50 | 55 | - |
https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1
dir.ca.gov says pel (mg/m³) is 29, as of 2026-08-05.
630080 | | Carbon monoxide | 25 | 29 | 200 ppm
Sources
- osha.govhttps://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1
- dir.ca.govhttps://www.dir.ca.gov/title8/5155.html