June 23, 2015
June 17, 2015
China Air Daily
A contrast in air quality between two different days in Beijing, June 17 and June 23, 2015, with PM2.5 levels of 70 and 258, respectively.
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A contrast in air quality between two different days in Beijing, June 17 and June 23, 2015, with PM2.5 levels of 70 and 258, respectively.