Carbon dioxide — CAS 124-38-9 — workplace exposure limit
What is the pel (ppm) for Carbon dioxide — CAS 124-38-9 — workplace exposure limit?
For Carbon dioxide, pel (ppm) is 5000; pel (mg/m³) is 9000; cas no. is 124-38-9, verified against its source on 2026-08-05.
Carbon dioxide | 124-38-9 | 5000 | 9000 | - |
— osha.gov, retrieved 2026-08-05
5000
The most of this substance workplace air may legally contain, averaged over an 8-hour shift — OSHA's permissible exposure limit (PEL), in parts per million, from the agency's own table row quoted below. Where federal OSHA and Cal/OSHA disagree, both limits are stated, each with its own agency's table row as evidence. NIOSH's number, where there is one, is shown separately: it is a recommended limit, not a legal one, and it is often the strictest of the three.
- Substance
- Carbon dioxide verified
- CAS No.
- 124-38-9 verified
- PEL (ppm)
- 5000 verified
- PEL (mg/m³)
- 9000 verified
- STEL (ppm)
- 30,000 per dir.ca.gov
- STEL (mg/m³)
- 54,000 per dir.ca.gov
- NIOSH REL (ppm)
- TWA 5000 per cdc.gov
- NIOSH REL (mg/m³)
- 9000 per cdc.gov
What dir.ca.gov says
124389 | | Carbon dioxide | 5,000 | 9,000 | | 30,000 | 54,000
— dir.ca.gov, retrieved 2026-08-05
What cdc.gov says
NIOSH REL TWA 5000 ppm (9000 mg/m3) ST 30,000 ppm (54,000 mg/m3)
— cdc.gov, retrieved 2026-09-08
Substance
CDC - NIOSH Pocket Guide to Chemical Hazards - Carbon dioxide
CAS No.
CAS No. 124-38-9
Sources
- osha.govhttps://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1
- dir.ca.govhttps://www.dir.ca.gov/title8/5155.html
- cdc.govhttps://www.cdc.gov/niosh/npg/npgd0103.html