
An educational diagram comparing the sizes of airborne particulate matter: PM2.5 (combustion particles, organic compounds, metals, less than 2.5 microns in diameter) and PM10 (dust, pollen, mold, less than 10 microns in diameter), shown relative to a human hair (50–70 microns in diameter) and fine beach sand (90 microns in diameter).Open full document
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An educational diagram comparing the sizes of airborne particulate matter: PM2.5 (combustion particles, organic compounds, metals, less than 2.5 microns in diameter) and PM10 (dust, pollen, mold, less than 10 microns in diameter), shown relative to a human hair (50–70 microns in diameter) and fine beach sand (90 microns in diameter).