Particulate Matter (PM) Basics | US EPA
www.epa.gov/pm-pollution/particulate-matter-pm-basics
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Most particles form in the atmosphere as a result of complex reactions of chemicals such as sulfur dioxide and nitrogen oxides, which are pollutants emitted from power plants, industries and automobiles
microscopic solids or liquid droplets
some may even get into your bloodstream
PM2.5, pose the greatest risk to health.
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