Particulate matter (PM)
PM stands for particulate matter, which is the term for a mixture of solid particles and liquids droplets found in the air. Particles have different sizes and or more or less visible.
PM10 are particles with diameter of 10 micrometers and smaller. Examples of PM10: pollen, dust (settling dust, cement dust), mold spores.
PM2.5 have a diameter of 2.5 micrometers and smaller. (human hair is approximately 70 micrometer in diameter). Example of PM2.5: house dust, animal dander, bacteria, cooking oil smoke/grease, smog, fly ash, settling dust.
PM1 have a diameter of 1 micrometer and smaller.Example of PM1 (from 0.3 to 1 micrometer): Bacteria, suspended dust, house dust, animal dander, smog, tobacco smoke, soot
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