Mono- and polycentric urban spatial structure and PM2.5 concentrations: Regarding the dependence on population density

《Mono- and polycentric urban spatial structure and PM2.5 concentrations: Regarding the dependence on population density》

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关键字: PM2.5 concentrations;Urban spatial structure;Polycentricity;Mono-centricity;Population density;Moderating effect

作者单位: Research Center for China Administrative Division, East China Normal University, Shanghai 200241, People's Republic of China;Institute of Eco-Chongming, 20 Cuiniao Rd., Chenjia Zhen, Chongming, Shanghai, 202162, People's Republic of China;Future City Lab, East China Normal University, Shanghai, 200241, People's Republic of China;The Center for Modern Chinese City Studies, East China Normal University, Shanghai 200241, People's Republic of China;School of Urban and Regional Science, East China Normal University, Shanghai 200241, People's Republic of China;Research Center for China Administrative Division, East China Normal University, Shanghai 200241, People's Republic of China;Institute of Eco-Chongming, 20 Cuiniao Rd., Chenjia Zhen, Chongming, Shanghai, 202162, People's Republic of China;Future City Lab, East China Normal University, Shanghai, 200241, People's Republic of China;The Center for Modern Chinese City Studies, East China Normal University, Shanghai 200241, People's Republic of China;School of Urban and Regional Science, East China Normal University, Shanghai 200241, People's Republic of China

摘要: City planners are increasingly drawn to the possibilities of transforming urban spatial structure as an important strategy for reducing air pollution. This paper addresses mixed findings in the existing literature through reliable methodology and heterogeneity tests. We examined the effects of spatial mono- and polycentricity on PM2.5 concentrations using spatial econometric models based on a three-year panel of data for cities at, or above, the prefecture in China. We found that population density had a robust moderating effect. That is, all else being equal, PM2.5 concentrations are lower when low-density cities have a strong-monocentric spatial structure and when high-density cities are polycentric. We estimated the population density threshold at which point the relationship between structure and density changes at about 160 persons/km.2 Our findings can serve as a possible criterion for differentiating low- and high-density cities in China and guide policymakers in planning optimal urban structures to mitigate air pollution.