Benzene — CAS 71-43-2 — workplace exposure limit
What is the niosh rel (ppm) for Benzene — CAS 71-43-2 — workplace exposure limit?
For Benzene, niosh rel (ppm) is TWA 0.1; cas no. is 71-43-2, verified against its source on 2026-09-08.
NIOSH REL Ca TWA 0.1 ppm ST 1 ppm
— cdc.gov, retrieved 2026-09-08
- Substance
- Benzene verified
- CAS No.
- 71-43-2 verified
- NIOSH REL (ppm)
- TWA 0.1 verified
- PEL (ppm)
- 1 per dir.ca.gov
- STEL (ppm)
- 5 per dir.ca.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 - Benzene
CAS No.
CAS No. 71-43-2
— all from cdc.gov, retrieved 2026-09-08
What osha.gov says
Benzene; see 1910.1028 | 71-43-2 | - | - | - |
— osha.gov, retrieved 2026-08-05
What dir.ca.gov says
71432 | S | Benzene; see also Section 5218 | 1 | | | 5 | --
— dir.ca.gov, retrieved 2026-08-05
What dir.ca.gov says
71432 | | Benzol; see Benzene
— dir.ca.gov, retrieved 2026-08-05
Sources
- cdc.govhttps://www.cdc.gov/niosh/npg/npgd0049.html
- osha.govhttps://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1
- dir.ca.govhttps://www.dir.ca.gov/title8/5155.html