Carbon dioxide
For Carbon dioxide, cas no. is 124-38-9; pel (ppm) is 5000; pel (mg/m³) is 9000, verified against its source on 2026-08-05.
- Substance
- Carbon dioxide
- CAS No.
- 124-38-9
- PEL (ppm)
- 5000
- PEL (mg/m³)
- 9000
What the source says
Carbon dioxide | 124-38-9 | 5000 | 9000 | - |
— 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 5000, as of 2026-08-05.
Carbon dioxide | 124-38-9 | 5000 | 9000 | - |
https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1
dir.ca.gov says pel (ppm) is 5,000, as of 2026-08-05.
124389 | | Carbon dioxide | 5,000 | 9,000 | | 30,000 | 54,000
https://www.dir.ca.gov/title8/5155.html
PEL (mg/m³)
osha.gov says pel (mg/m³) is 9000, as of 2026-08-05.
Carbon dioxide | 124-38-9 | 5000 | 9000 | - |
https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1
dir.ca.gov says pel (mg/m³) is 9,000, as of 2026-08-05.
124389 | | Carbon dioxide | 5,000 | 9,000 | | 30,000 | 54,000
Sources
- osha.govhttps://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1
- dir.ca.govhttps://www.dir.ca.gov/title8/5155.html