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TeachMeFinance.com - explain Particulate Matter (PM) Particulate Matter (PM) The term 'Particulate Matter (PM)' as it applies to the area of the environment can be defined as 'Very small pieces of solid or liquid matter such as particles of soot, dust, fumes, mists or aerosols. The physical characteristics of particles, and how they combine with other particles, are part of the feedback mechanisms of the atmosphere. See aerosol, sulfate aerosols.6'. Previous 5 Terms: Particle size Particle Trajectory Model Particle velocity Particulate particulate matter Next 5 Terms: particulates Particulates partim Partly Cloudy Partly Sunny About the author Mark McCracken Author: Mark McCracken is a corporate trainer and author living in Higashi Osaka, Japan. He is the author of thousands of online articles as well as the Business English textbook, "25 Business Skills in English". Copyright © 2005-2011 by Mark McCracken, All Rights Reserved. TeachMeFinance.com is an informational website, and should not be used as a substitute for professional medical, legal or financial advice. Information presented at TeachMeFinance.com is provided on an "AS-IS" basis. Please read the disclaimer for details.