The Direct and Spillover Effect of Multi-Dimensional Urbanization on PM_2.5 Concentrations: A Case Study from the Chengdu-Chongqing Urban Agglomeration in China.

Using population urbanization as an example, the results show that the coefficients of lnpop and W*lnpop for 2000 and 2015 were significantly greater than zero and showed an increasing trend ( Table 2 , columns 2 and 3).

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