CIIC:Today's featured article/January 14, 2013
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Revision as of 02:35, 14 January 2013 by imported>Ciic (Created page with 'thumb|250px|left|Thick smog engulfs Beijing. '''PM2.5''' particles are air pollutants with a diameter of 2.5 micrometers or less, small enough to invade even the...')
PM2.5 particles are air pollutants with a diameter of 2.5 micrometers or less, small enough to invade even the smallest airways. They generally come from activities that burn fossil fuels, such as traffic, smelting, and metal processing. (More...)
