o-Toluidine — CAS 95-53-4 — workplace exposure limit
What is the pel (ppm) for o-Toluidine — CAS 95-53-4 — workplace exposure limit?
For o-Toluidine, pel (ppm) is disputed: 5 per osha.gov, 2 per dir.ca.gov; pel (mg/m³) is disputed: 22 per osha.gov, 9 per dir.ca.gov; cas no. is 95-53-4, verified against its source on 2026-08-05.
o-Toluidine | 95-53-4 | 5 | 22 | X |
— osha.gov, retrieved 2026-08-05
- Substance
- o-Toluidine verified
- CAS No.
- 95-53-4 verified
- PEL (ppm)
- 5 sources disagree
- PEL (mg/m³)
- 22 sources disagree
- NIOSH REL, as stated
- Ca [skin] See Appendix A per cdc.gov
What cdc.gov says
NIOSH REL Ca [skin] See Appendix A
— cdc.gov, retrieved 2026-09-08
Substance
CDC - NIOSH Pocket Guide to Chemical Hazards - o-Toluidine
CAS No.
CAS No. 95-53-4
What dir.ca.gov says
95534 | | o-Methylaniline; see o-Toluidine
— dir.ca.gov, retrieved 2026-08-05
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 5, as of 2026-08-05.
o-Toluidine | 95-53-4 | 5 | 22 | X |
https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1
dir.ca.gov says pel (ppm) is 2, as of 2026-08-05.
95534 | S | o-Toluidine; o-methylaniline | 2 | 9
https://www.dir.ca.gov/title8/5155.html
PEL (mg/m³)
osha.gov says pel (mg/m³) is 22, as of 2026-08-05.
o-Toluidine | 95-53-4 | 5 | 22 | X |
https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1
dir.ca.gov says pel (mg/m³) is 9, as of 2026-08-05.
95534 | S | o-Toluidine; o-methylaniline | 2 | 9
Sources
- osha.govhttps://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1
- cdc.govhttps://www.cdc.gov/niosh/npg/npgd0622.html
- dir.ca.govhttps://www.dir.ca.gov/title8/5155.html