Impact of urban agglomeration construction on urban air quality-empirical test based on PSM-DID model.

From the above regression results also untested: in general, the construction of urban agglomerations generally reduces the concentrations of urban air pollutants, urban air quality conditions are on a positive trend .From the results of the inclusion of control variables, the socio-economic factors of the Central Yunnan and Central Chengdu-Chongqing urban agglomerations basically show a trend towards lower urban air pollutant concentrations, Urban air quality conditions are improving. while the effect of socio-economic factors on urban air pollutant concentrations in the Central Guizhou urban agglomeration is insignificant.

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From the regression results of the control variables, the socio-economic factors, the socio-economic development level has a significant effect on the urban AQI, PM10, PM2.5 and CO concentration with negative coefficients, which indicates that the socio-economic development level significantly reduces the urban PM10, PM and CO concentration, and the air quality index (AQI) has a significant trend to become better.

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