The Direct and Spillover Effect of Multi-Dimensional Urbanization on PM2.5 Concentrations: A Case Study from the Chengdu-Chongqing Urban Agglomeration in China.

Sicheng Wang,Pingjun Sun,Guoen Wei,Shengnan Jiang,Feng Sun,Zhaomin Zhang

doi:10.3390/ijerph182010609

Abstract

The Chengdu-Chongqing urban agglomeration (CUA) faces considerable air quality concerns, although the situation has improved in the past 15 years. The driving effects of population, land and economic urbanization on PM2.5 concentrations in the CUA have largely been overlooked in previous studies. The contributions of natural and socio-economic factors to PM2.5 concentrations have been ignored and the spillover effects of multi-dimensional urbanization on PM2.5 concentrations have been underestimated. This study explores the spatial dependence and trend evolution of PM2.5 concentrations in the CUA at the grid and county level, analyzing the direct and spillover effects of multi-dimensional urbanization on PM2.5 concentrations. The results show that the mean PM2.5 concentrations in CUA dropped to 48.05 μg/m3 at an average annual rate of 4.6% from 2000 to 2015; however, in 2015, there were still 91% of areas exposed to pollution risk (>35 μg/m3). The PM2.5 concentrations in 92.98% of the area have slowly decreased but are rising in some areas, such as Shimian County, Xuyong County and Gulin County. The PM2.5 concentrations in this region presented a spatial dependence pattern of “cold spots in the east and hot spots in the west”. Urbanization was not the only factor contributing to PM2.5 concentrations. Commercial trade, building development and atmospheric pressure were found to have significant contributions. The spillover effect of multi-dimensional urbanization was found to be generally stronger than the direct effects and the positive impact of land urbanization on PM2.5 concentrations was stronger than population and economic urbanization. The findings provide support for urban agglomerations such as CUA that are still being cultivated to carry out cross-city joint control strategies of PM2.5 concentrations, also proving that PM2.5 pollution control should not only focus on urban socio-economic development strategies but should be an integration of work optimization in various areas such as population agglomeration, land expansion, economic construction, natural adaptation and socio-economic adjustment.

Highlights

The results showed that the Condition Index and Variance Inflation Factor (VIF) of tem, hum, afa and pre were all over the threshold and were eliminated
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)
We found that the impact of the direct and spillover effect of urbanization on PM2.5 concentrations was generally: land urbanization > economic urbanization > population urbanization

Summary

Introduction

While China’s rapid urbanization has significantly improved people’s living standards, social well-being and economic development, it has increased the concerns of PM2.5 air pollution caused by industrial production agglomeration, disorderly urban expansion and automobile exhaust emissions [1,2]. Long-term exposure to PM2.5 increases the survival risk of residents and causes nearly 1.3 million premature deaths in China every year [3]. The rapid transmission of PM2.5 pollution and its components is explicitly linked to human well-being, affecting public health, causing global warming and threatening regional.

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Conclusion