Phosphine — workplace exposure limit
What is the pel (ppm) for Phosphine — workplace exposure limit?
For Phosphine, pel (ppm) is 0.3; pel (mg/m³) is 0.4; cas no. is 7803-51-2, verified against its source on 2026-08-05.
Phosphine | 7803-51-2 | 0.3 | 0.4 | - |
— osha.gov, retrieved 2026-08-05
0.3
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
- Phosphine verified
- CAS No.
- 7803-51-2 verified
- PEL (ppm)
- 0.3 verified
- PEL (mg/m³)
- 0.4 verified
- NIOSH REL (ppm)
- TWA 0.3 per cdc.gov
- NIOSH REL (mg/m³)
- 0.4 per cdc.gov
- STEL (ppm)
- 1 per dir.ca.gov
- STEL (mg/m³)
- 1 per dir.ca.gov
What cdc.gov says
NIOSH REL TWA 0.3 ppm (0.4 mg/m3) ST 1 ppm (1 mg/m3)
— cdc.gov, retrieved 2026-09-08
What dir.ca.gov says
7803512 | | Phosphine; PH$3 | 0.3 | 0.4 | | 1 | 1
— dir.ca.gov, retrieved 2026-08-05
Sources
- osha.govhttps://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1
- cdc.govhttps://www.cdc.gov/niosh/npg/npgd0505.html
- dir.ca.govhttps://www.dir.ca.gov/title8/5155.html