particulate matter

== English == === Noun === particulate matter (countable and uncountable, plural particulate matters) Any solid or liquid in a finely subdivided state, especially when considered as an atmospheric pollutant. Synonyms: particulates, PM Hyponyms: atmospheric particulate matter, suspended particulate matter ==== Usage notes ==== Sometimes abbreviated as PM with a subscripted number representing the size of the particles in micrometres. Thus, PM2.5 represents particles with a maximum diameter of 2.5 µm. ==== Translations ==== ==== See also ==== aerosol (“particulate/air mixture”) === Further reading === particulates on Wikipedia.Wikipedia