Chloroform — CAS 67-66-3 — workplace exposure limit
What is the niosh rel (ppm) for Chloroform — CAS 67-66-3 — workplace exposure limit?
For Chloroform, niosh rel (ppm) is ST 2; niosh rel (mg/m³) is 9.78; cas no. is 67-66-3, verified against its source on 2026-09-08.
NIOSH REL Ca ST 2 ppm (9.78 mg/m3) [60-minute]
— cdc.gov, retrieved 2026-09-08
- Substance
- Chloroform verified
- CAS No.
- 67-66-3 verified
- NIOSH REL (ppm)
- ST 2 verified
- NIOSH REL (mg/m³)
- 9.78 verified
- PEL (ppm)
- (C)50 per osha.gov
- PEL (mg/m³)
- (C)240 per osha.gov
Where each value comes from
This source states these in separate places, so each value is shown with the passage that states it.
Substance
CDC - NIOSH Pocket Guide to Chemical Hazards - Chloroform
CAS No.
CAS No. 67-66-3
— all from cdc.gov, retrieved 2026-09-08
What osha.gov says
Chloroform (Trichloromethane) | 67-66-3 | (C)50 | (C)240 | - |
— osha.gov, retrieved 2026-08-05
What dir.ca.gov says
67663 | | Chloroform; trichloromethane | 2 | 9.78
— dir.ca.gov, retrieved 2026-08-05
What dir.ca.gov says
67663 | | Trichloromethane; see Chloroform
— dir.ca.gov, retrieved 2026-08-05
Sources
- cdc.govhttps://www.cdc.gov/niosh/npg/npgd0127.html
- osha.govhttps://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1
- dir.ca.govhttps://www.dir.ca.gov/title8/5155.html