Title: permissible exposure limit
Long Title: IUPAC Gold Book - permissible exposure limit
DOI: 10.1351/goldbook.15971
Status: current

Definition
Recommendation by U.S. OSHA for a time-weighted average concentration that must not be exceeded during any \(\pu{8\!\mbox{-}h}\) work shift of a \(\pu{40\!\mbox{-}h}\) working week.

Related Term
- time-weighted average concentration: https://goldbook.iupac.org//terms/view/16143

Source
- PAC, 2007, 79, 1153. 'Glossary of terms used in toxicology, 2nd edition (IUPAC Recommendations 2007)' on page 1280 (https://doi.org/10.1351/pac200779071153)

Other Outputs
- html: https://goldbook.iupac.org/terms/view/15971/html
- json: https://goldbook.iupac.org/terms/view/15971/json
- xml: https://goldbook.iupac.org/terms/view/15971/xml

Citation: Citation: 'permissible exposure limit' in IUPAC Compendium of Chemical Terminology, 5th ed. International Union of Pure and Applied Chemistry; 2025. Online version 5.0.0, 2025. 10.1351/goldbook.15971
License: The IUPAC Gold Book is licensed under Creative Commons Attribution-ShareAlike CC BY-SA 4.0 International (https://creativecommons.org/licenses/by-sa/4.0/) for individual terms.
Collection: If you are interested in licensing the Gold Book for commercial use, please contact the IUPAC Executive Director at executivedirector@iupac.org .
Disclaimer: The International Union of Pure and Applied Chemistry (IUPAC) is continuously reviewing and, where needed, updating terms in the Compendium of Chemical Terminology (the IUPAC Gold Book). Users of these terms are encouraged to include the version of a term with its use and to check regularly for updates to term definitions that you are using.
Accessed: 2026-05-08T04:00:24+00:00