Dioxane — CAS 123-91-1 — workplace exposure limit
What is the niosh rel (ppm) for Dioxane — CAS 123-91-1 — workplace exposure limit?
For Dioxane, niosh rel (ppm) is C 1; niosh rel (mg/m³) is 3.6; cas no. is 123-91-1, verified against its source on 2026-09-08.
NIOSH REL Ca C 1 ppm (3.6 mg/m3) [30-minute]
— cdc.gov, retrieved 2026-09-08
- Substance
- Dioxane verified
- CAS No.
- 123-91-1 verified
- NIOSH REL (ppm)
- C 1 verified
- NIOSH REL (mg/m³)
- 3.6 verified
- PEL (ppm)
- 100 per osha.gov
- PEL (mg/m³)
- 360 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 - Dioxane
CAS No.
CAS No. 123-91-1
— all from cdc.gov, retrieved 2026-09-08
What osha.gov says
Dioxane (Diethylene dioxide) | 123-91-1 | 100 | 360 | X |
— osha.gov, retrieved 2026-08-05
What dir.ca.gov says
123911 | S | p-Dioxane;
— dir.ca.gov, retrieved 2026-08-05
What dir.ca.gov says
123911 | | 1,4-Diethylene dioxide; see p-Dioxane
— dir.ca.gov, retrieved 2026-08-05
Sources
- cdc.govhttps://www.cdc.gov/niosh/npg/npgd0237.html
- osha.govhttps://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1
- dir.ca.govhttps://www.dir.ca.gov/title8/5155.html