Reference Source

Methyl bromide — workplace exposure limit

What is the pel (ppm) for Methyl bromide — workplace exposure limit?

For Methyl bromide, pel (ppm) is (C)20; pel (mg/m³) is (C)80; cas no. is 74-83-9, verified against its source on 2026-08-05.

Methyl bromide | 74-83-9 | (C)20 | (C)80 | X |

— osha.gov, retrieved 2026-08-05

(C)20
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
Methyl bromide verified
CAS No.
74-83-9 verified
PEL (ppm)
(C)20 verified
PEL (mg/m³)
(C)80 verified
Ceiling
20 ppm per dir.ca.gov
NIOSH REL, as stated
Ca See Appendix A per cdc.gov

What cdc.gov says

NIOSH REL Ca See Appendix A

— 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 (C)20, as of 2026-08-05.

Methyl bromide | 74-83-9 | (C)20 | (C)80 | X |

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

dir.ca.gov says pel (ppm) is 1, as of 2026-08-05.

74839 | S | Methyl bromide | 1 | 3.88 | 20 ppm

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

PEL (mg/m³)

osha.gov says pel (mg/m³) is (C)80, as of 2026-08-05.

Methyl bromide | 74-83-9 | (C)20 | (C)80 | X |

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

dir.ca.gov says pel (mg/m³) is 3.88, as of 2026-08-05.

74839 | S | Methyl bromide | 1 | 3.88 | 20 ppm

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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