
Keywords: Air pollution; PM2.5; Spatiotemporal variations; Panel data model; China; PM2.5, PM10; Particulate Matter Smaller than 2.5â¯Î¼m, 10â¯Î¼m; SO2; Sulfur Dioxide; NO2; Nitrogen Dioxide; CAAQS; Chinese Ambient Air Quality Standards; MEP; Ministry of Environm