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Particulate Matter

Definition:  all types of airborne solid and liquid particles; sizes range from 0.005 – 100 microns [mm]

Comparisons

  • diameter human hair:  60-70 microns

  • smallest visible:  20-30 microns

Sources include mechanical reduction, wind erosion, combustion, skin flakes, paper dust, insect parts, natural and synthetic fibers, industrial processes, smog, copiers and printers

People emit large numbers of particles:

  • 400,000 per minute sitting at a desk

  • 45,000,000 per minute during exercise

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