Hydrogen chloride — workplace exposure limit
What is the pel (ppm) for Hydrogen chloride — workplace exposure limit?
For Hydrogen chloride, pel (ppm) is (C)5; pel (mg/m³) is (C)7; cas no. is 7647-01-0, verified against its source on 2026-08-05.
Hydrogen chloride | 7647-01-0 | (C)5 | (C)7 | - |
— osha.gov, retrieved 2026-08-05
- Substance
- Hydrogen chloride verified
- CAS No.
- 7647-01-0 verified
- PEL (ppm)
- (C)5 verified
- PEL (mg/m³)
- (C)7 verified
- Ceiling
- 2 ppm per dir.ca.gov
- NIOSH REL (ppm)
- C 5 per cdc.gov
- NIOSH REL (mg/m³)
- 7 per cdc.gov
What cdc.gov says
NIOSH REL C 5 ppm (7 mg/m3)
— cdc.gov, retrieved 2026-09-08
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 (C)5, as of 2026-08-05.
Hydrogen chloride | 7647-01-0 | (C)5 | (C)7 | - |
https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1
dir.ca.gov says pel (ppm) is 0.3, as of 2026-08-05.
7647010 | | Hydrogen chloride | 0.3 | 0.45 | 2 ppm
https://www.dir.ca.gov/title8/5155.html
PEL (mg/m³)
osha.gov says pel (mg/m³) is (C)7, as of 2026-08-05.
Hydrogen chloride | 7647-01-0 | (C)5 | (C)7 | - |
https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1
dir.ca.gov says pel (mg/m³) is 0.45, as of 2026-08-05.
7647010 | | Hydrogen chloride | 0.3 | 0.45 | 2 ppm
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/npgd0332.html