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What is particulate matter and how is it formed?

formed Particulate
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What is particulate matter and how is it formed?

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Particulate matter 2.5 (PM 2.5) can be produced directly or may form in the atmosphere when other pollutants react. It consists of microscopic fine particles—some only as wide as 1/28th the width of a human hair—that can be breathed deeply into the lungs.

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