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The heaviest aerosol pollution day in the historical record of the Yangtze River Delta occurred on 19 January 2007, in which the daily concentration of PM 10 reached 512μgm −3 in Shanghai, 463μgm −3 in Suzhou, 354μgm −3 in Hangzhou, and 282μgm −3 in Nanjing. The hourly concentrations of PM 2.5 and PM 10 reached peak values of 466 and 744μgm ...
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