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We analyzed fluctuation in Beijing’s air quality over 328 days, based on air quality grades and air quality data from 35 atmospheric monitoring stations. Our results show the air over Beijing is subject to pollution 152 days of the year, or 46.34 %. Among all pollutants, fine particulates, solid or liquid, 2.5 μm or less in size (PM 2.5 ), appeared most frequently as the primary...
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