Biphenyl; diphenyl; phenylbenzene — CAS 92524 — workplace exposure limit

What is the pel (ppm) for Biphenyl; diphenyl; phenylbenzene — CAS 92524 — workplace exposure limit?

For Biphenyl; diphenyl; phenylbenzene, pel (ppm) is 0.2; pel (mg/m³) is disputed: 1.5 per dir.ca.gov, 1 per osha.gov; cas no. is 92524, verified against its source on 2026-09-29.

92524 | | Biphenyl; diphenyl; phenylbenzene | 0.2 | 1.5

— dir.ca.gov, retrieved 2026-08-05

0.2

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.

Sourcedir.ca.gov

Verified2026-09-29

Review by2027-08-05

DatasetUS workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side

Substance: Biphenyl; diphenyl; phenylbenzene verified
CAS No.: 92524 verified
PEL (ppm): 0.2 verified
PEL (mg/m³): 1.5 sources disagree
NIOSH REL (ppm): 0.2 per cdc.gov
NIOSH REL (mg/m³): TWA 1 per cdc.gov

What cdc.gov says

NIOSH REL TWA 1 mg/m3 (0.2 ppm)

— cdc.gov, retrieved 2026-09-08

Substance

CDC - NIOSH Pocket Guide to Chemical Hazards - Diphenyl

CAS No.

CAS No. 92-52-4

The same source also states

92524 | | Diphenyl; see Biphenyl

— 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 (mg/m³)

dir.ca.gov says pel (mg/m³) is 1.5, as of 2026-08-05.

92524 | | Biphenyl; diphenyl; phenylbenzene | 0.2 | 1.5

https://www.dir.ca.gov/title8/5155.html

osha.gov says pel (mg/m³) is 1, as of 2026-08-05.

Diphenyl (Biphenyl) | 92-52-4 | 0.2 | 1 | - |

https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1

Sources

dir.ca.govhttps://www.dir.ca.gov/title8/5155.html
cdc.govhttps://www.cdc.gov/niosh/npg/npgd0239.html
osha.govhttps://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1

Last verified against source: 2026-09-29. Due for re-check by 2027-08-05. This page as Markdown · OKF bundle · full dataset as JSON.

What is the OSHA exposure limit for this substance?Find the exposure limit for a substance in workplace air — federal OSHA, California and NIOSH, side by side.