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Pertaining to microorganisms, particles below a specified size, and droplet nuclei that are small enough to remain suspended in the atmosphere for long periods, during which they may be inhaled and cause disease or lung damage. The specified size varies with density and environmental conditions. Particles from 25 to 50 microns can remain suspended for long periods; particles smaller than 2.5 microns can penetrate to the alveoli of the lungs.

Subjects: Public Health and Epidemiology.

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