“…The exacerbation of urban haze pollution and its serious consequences have stimulated scholars' enthusiasm for the research on the causes [7], formation mechanisms [8], sources [9][10][11], and influencing factors of haze pollution [12][13][14][15]. Generally, the influencing factors include economic growth [16][17][18], transportation construction [19][20][21], urbanization [22,23], industrial agglomeration [24,25], energy intensity [5,16,26,27], FDI [28], trade liberalization [29], technological progress [30], environmental regulation [31][32][33], and other meteorological factors [34][35][36]. Xu and Lin [5] adopted panel data models to study the main driving forces of PM2.5, involving economic growth, urbanization, private cars, coal consumption, and energy efficiency, and also analyzed the regional heterogeneity in China.…”