CIIC:Today's featured article/October 14, 2016

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Thick smog engulfs Beijing.

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...)

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