| Definition of 'particulate matter' |
Princeton's WordNet |
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1. (noun) particulate, 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)
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| Definition of 'particulate matter' |
U.S. National Library of Medicine |
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1. particulate matter
Particles of any solid substance, generally under 30 microns in size, often noted as PM30. There is special concern with PM1 which can get down to PULMONARY ALVEOLI and induce MACROPHAGE ACTIVATION and PHAGOCYTOSIS leading to FOREIGN BODY REACTION and LUNG DISEASES.
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Definitions of particulate matter 
