Particle:
A tiny mass of material. Airborne particles, materials that exist in the atmosphere as a solid or liquid, can be natural, caused by stirring of soil dusts, or anthropogenic. They vary in size from coarse (diameter > 3 µm) to fine (< 3µm) . Sometimes inhalable or respirable is used to describe those particles (< 2 µm) which can be inhaled through the nose and enter the lungs.
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