Ammonia — CAS 7664-41-7 — workplace exposure limit
What is the pel (ppm) for Ammonia — CAS 7664-41-7 — workplace exposure limit?
For Ammonia, pel (ppm) is disputed: 50 per osha.gov, 25 per dir.ca.gov; pel (mg/m³) is disputed: 35 per osha.gov, 18 per dir.ca.gov; cas no. is 7664-41-7, verified against its source on 2026-08-05.
Ammonia | 7664-41-7 | 50 | 35 | - |
— osha.gov, retrieved 2026-08-05
- Substance
- Ammonia verified
- CAS No.
- 7664-41-7 verified
- PEL (ppm)
- 50 sources disagree
- PEL (mg/m³)
- 35 sources disagree
- STEL (ppm)
- 35 per dir.ca.gov
- STEL (mg/m³)
- 27 per dir.ca.gov
- NIOSH REL (ppm)
- TWA 25 per cdc.gov
- NIOSH REL (mg/m³)
- 18 per cdc.gov
What cdc.gov says
NIOSH REL TWA 25 ppm (18 mg/m3) ST 35 ppm (27 mg/m3)
— cdc.gov, retrieved 2026-09-08
Substance
CDC - NIOSH Pocket Guide to Chemical Hazards - Ammonia
CAS No.
CAS No. 7664-41-7
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.
Ammonia | 7664-41-7 | 50 | 35 | - |
https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1
dir.ca.gov says pel (ppm) is 25, as of 2026-08-05.
7664417 | | Ammonia | 25 | 18 | | 35 | 27
https://www.dir.ca.gov/title8/5155.html
PEL (mg/m³)
osha.gov says pel (mg/m³) is 35, as of 2026-08-05.
Ammonia | 7664-41-7 | 50 | 35 | - |
https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1
dir.ca.gov says pel (mg/m³) is 18, as of 2026-08-05.
7664417 | | Ammonia | 25 | 18 | | 35 | 27
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/npgd0028.html