Also found in: Dictionary, Thesaurus, 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.
The American Heritage® Medical Dictionary Copyright © 2007, 2004 by Houghton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved.
PM10A general term for organic air pollutants measuring less than 10 µm in diameter, which are linked to increased respiratory morbidity and mortality.
Segen's Medical Dictionary. © 2012 Farlex, Inc. All rights reserved.
Small but discrete airborne or waterborne solids, such as fragments of ash, dust, pollen, or soot. They may be generated by the burning of fossil fuels, agricultural or construction projects, incineration, mining, and other natural and artificial processes. Higher levels of PM in air have been associated with increases in lung disease and mortality in exposed populations.
Medical Dictionary, © 2009 Farlex and Partners