Also found in: Thesaurus, Medical, Financial, Acronyms, Encyclopedia, Wikipedia.
n. Abbr. PM
Material suspended in the air in the form of minute solid particles or liquid droplets, especially when considered as an atmospheric pollutant.
Switch to new thesaurus
|Noun||1.||particulate matter - a small discrete mass of solid or liquid matter that remains individually dispersed in gas or liquid emissions (usually considered to be an atmospheric pollutant)|
material, stuff - the tangible substance that goes into the makeup of a physical object; "coal is a hard black material"; "wheat is the stuff they use to make bread"
dust - fine powdery material such as dry earth or pollen that can be blown about in the air; "the furniture was covered with dust"