15442 IUPAC Gold Book - action level 10.1351/goldbook.15442 15442 current 1 Concentration of a substance in air, soil, water, or other defined medium at which specified emergency counter-measures, such as the seizure and destruction of contaminated materials, evacuation of the local population or closing down the sources of pollution, are to be taken. Concentration of a pollutant in air, soil, water, or other defined medium at which some kind of preventive action (not necessarily of an emergency nature) is to be taken. PAC, 2007, 79, 1153. 'Glossary of terms used in toxicology, 2nd edition (IUPAC Recommendations 2007)' on page 1159 (https://doi.org/10.1351/pac200779071153) https://goldbook.iupac.org/terms/view/15442/html https://goldbook.iupac.org/terms/view/15442/json https://goldbook.iupac.org/terms/view/15442/plain Citation: 'action level' 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.15442 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. If you are interested in licensing the Gold Book for commercial use, please contact the IUPAC Executive Director at executivedirector@iupac.org . 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. 2026-06-06T21:40:23+00:00