Spatiotemporal behaviors of particulate matter (PM 2.5 and PM 10 ) and trace gases (SO 2 , NO 2 , CO, and O 3 ) in Hefei during the period from December 2013 to November 2015 are investigated. The mean annual PM 2.5 (PM 10 ) concentrations are 89.1 ± 59.4 µg/m 3 (118.9 ± 66.8 µg/m 3 ) and 61.6 ± 32.2 µg/m 3 (91.3 ± 40.9 µg/m 3
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