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particulate matter

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particulate matter  
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® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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N95 Swine Flu Virus Masks
NIOSH Approved, Meet CDC Guidelines Seen on ABC News, IN STOCK
www.FluArmour.com
particulate matter

noun
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) [syn: particulate] 
WordNet® 3.0, © 2006 by Princeton University.
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