Reference Source

Naphtha (Coal tar) — workplace exposure limit

What is the pel (ppm) for Naphtha (Coal tar) — workplace exposure limit?

For Naphtha (Coal tar), pel (ppm) is 100; pel (mg/m³) is 400; cas no. is 8030-30-6, verified against its source on 2026-08-05.

Naphtha (Coal tar) | 8030-30-6 | 100 | 400 | - |

— osha.gov, retrieved 2026-08-05

100
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.
Sourceosha.gov
Verified
Review by
DatasetUS workplace chemical exposure limits: federal OSHA, Cal/OSHA and NIOSH, side by side
Substance
Naphtha (Coal tar) verified
CAS No.
8030-30-6 verified
PEL (ppm)
100 verified
PEL (mg/m³)
400 verified
NIOSH REL (ppm)
TWA 100 per cdc.gov
NIOSH REL (mg/m³)
400 per cdc.gov
STEL (ppm)
400 per dir.ca.gov
STEL (mg/m³)
1800 per dir.ca.gov

What cdc.gov says

NIOSH REL TWA 100 ppm (400 mg/m3)

— cdc.gov, retrieved 2026-09-08

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 100, as of 2026-08-05.

Naphtha (Coal tar) | 8030-30-6 | 100 | 400 | - |

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

dir.ca.gov says pel (ppm) is 300, as of 2026-08-05.

8030306 | | VM & P (Varnish Makers and Painters) Naphtha | 300 | 1,350 | | 400 | 1800

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

PEL (mg/m³)

osha.gov says pel (mg/m³) is 400, as of 2026-08-05.

Naphtha (Coal tar) | 8030-30-6 | 100 | 400 | - |

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

dir.ca.gov says pel (mg/m³) is 1,350, as of 2026-08-05.

8030306 | | VM & P (Varnish Makers and Painters) Naphtha | 300 | 1,350 | | 400 | 1800

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

Sources

Last verified against source: . Due for re-check by . 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.

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