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Particulate matter(PM)has been of great concern in China due to the increasing haze pollution in recent years.In 2012,the Chinese national ambient air quality standard(NAAQS)was amended with a "more strict" regulation on the PM concentrations,i.e.,35 and 70 μg/m3 for annual PM2.5 and PM10 averages,respectively(Grade-Ⅱ,GB3095-2012).