CIIC:Today's featured article/December 26, 2015
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Revision as of 09:38, 25 December 2015 by imported>Ciic (Created page with 'thumb|250px|left|Thick smog engulfs Beijing. '''Particulate matters''' or '''PM''' , is the term for particles found in the air, including dust, dirt, soot, smok...')
Particulate matters or PM , is the term for particles found in the air, including dust, dirt, soot, smoke, and liquid droplets. PM2.5 (细颗粒物) particles are air pollutants with a diameter of 2.5 micrometers or less, small enough to invade even the smallest airways. (More...)
