{"term":{"id":"14736","title":"hazard index","longtitle":"IUPAC Gold Book - hazard index","doi":"10.1351\/goldbook.14736","code":"14736","status":"current","initialism":"<em>initialism<\/em>: HI","definitions":[{"id":1,"text":"Sum of the hazard quotients for substances that affect the same target organ or organ system.","notes":{"1":"Ideally, hazard quotients should be combined for pollutants that cause adverse effects by the same mechanism. Aggregate exposures below an HI of \\(\\pu{1.0}\\) are unlikely to result in adverse health effects over a lifetime of exposure. An HI greater than \\(\\pu{1.0}\\) does not necessarily suggest a likelihood of adverse effects. The HI cannot be translated to a probability that adverse effects will occur, and is not likely to be proportional to risk."},"links":[{"term":"hazard quotients","url":"https:\/\/goldbook.iupac.org\/\/terms\/view\/14737"}],"sources":["PAC, 2009, 81, 829. 'Glossary of terms used in ecotoxicology (IUPAC Recommendations 2009)' on page 894 (https:\/\/doi.org\/10.1351\/PAC-REC-08-07-09)"]}],"altoutputs":{"html":"https:\/\/goldbook.iupac.org\/terms\/view\/14736\/html","xml":"https:\/\/goldbook.iupac.org\/terms\/view\/14736\/xml","plain":"https:\/\/goldbook.iupac.org\/terms\/view\/14736\/plain"},"citation":"Citation: 'hazard index' 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.14736","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":"2026-04-21T16:30:55+00:00"}}