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Nov 27, 2015 · Dust particles are the main source of PM10. PM2.5 is comparatively much smaller in size as compared to other particles and pollutants. Meanwhile, PM 2.5 is particulates that have a diameter of 2.5 micrometers or smaller. These particles are so small that they can only be viewed under a microscope. Exactly how bad is PM2.5 in China?
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