Difference between revisions of "CIIC:Today's featured article/December 18, 2016"
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Latest revision as of 06:58, 19 December 2016
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...)
