16051 IUPAC Gold Book - respirable dust 10.1351/goldbook.16051 16051 current synonym: respirable particles 1 Mass fraction of dust (particles) that penetrates to the unciliated airways of the lung (the alveolar region). This fraction is represented by a cumulative log-normal curve having a median aerodynamic diameter of \(\pu{4 \upmu m}\), standard deviation \(\pu{2 \upmu m}\) (values for humans). PAC, 2007, 79, 1153. 'Glossary of terms used in toxicology, 2nd edition (IUPAC Recommendations 2007)' on page 1301 (https://doi.org/10.1351/pac200779071153) https://goldbook.iupac.org/terms/view/16051/html https://goldbook.iupac.org/terms/view/16051/json https://goldbook.iupac.org/terms/view/16051/plain Citation: 'respirable dust' 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.16051 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. 2026-05-08T03:58:25+00:00