Spatial-temporal heterogeneity and driving factors of PM_2.5 in China: A natural and socioeconomic perspective.

In particular, PD coefficient was positive throughout the region and vary considerably (0.04 to 6.93).There was an increasing trend from southeast to northwest.

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PM 2.5 concentrations of 240 cities showed a decreasing trend among the 252 cities, with the proportion of decreasing cities reaching 95.24%, of which 42 cities had a decrease rate of more than 5 μg m −3 a −1 , accounting for 16.67% of the total number of decreasing cities ( Figures 1 , 2 ).

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The Moran's I value showed a trend of decreasing and then increasing, with the lowest value in 2017 and the highest values in 2018 and 2019, which indicated that an overall trend toward aggregation.

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