Topical Terminology > Pm2.5 (Particulate Matter Less Than 2.5 Microns)
1 Definition
PM2.5 (Particulate Matter less than 2.5 microns)
For PM2.5 (Particulate Matter less than 2.5 microns) we have a term and definition in Air Quality.
Pm2.5 (Particulate Matter Less Than 2.5 Microns) (Air Quality) 
Tiny solid or liquid particules, generally soot and aerosols. The size of the particles (2.5 microns or smaller, about 0.0001 inches or less) allows them to easily enter the air sacs deep in the lungs where they may cause adverse health effects; PM2.5 also causes visibility reduction
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