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Examining the Potential Scaling Law in Urban PM2.5 Pollution Risks along with the Nationwide Air Environmental Effort in China

Author

Listed:
  • Lei Yao

    (College of Geography and Environment, Shandong Normal University, Jinan 250014, China)

  • Wentian Xu

    (College of Geography and Environment, Shandong Normal University, Jinan 250014, China)

  • Ying Xu

    (School of Civil Engineering, Shandong Jiaotong University, Jinan 250023, China)

  • Shuo Sun

    (College of Geography and Environment, Shandong Normal University, Jinan 250014, China)

Abstract

Urban scaling law provides a quantitative understanding of the fundamental nonlinear properties of how cities work. Addressing this, this study intended to examine the potential scaling law that may lie in urban air pollution. With ground-monitored PM2.5 data and statistical socioeconomic factors in 265 Chinese cities (2015–2019), a targeted analysis, based on the scaling power-law model and scale-adjusted metropolitan indicator (SAMI) was conducted. The main findings of this study were summarized as follows: (1) A significant sublinear scaling relationship between PM2.5 and urban population size indicated that air quality degradation significantly lagged behind urban growth, affirming the remarkable effectiveness of national efforts on atmospheric environment improvement. (2) SAMI analysis expressed the relative conflict risk between PM2.5 pollution and urbanization and showed significant spatial cluster characteristics. Cities in central China showed higher potential risk than other regions, and there was a clear southward tendency for the city clusters with increasing SAMIs during the study period. (3) During the study period, urbanization was not the reason affecting the human-land conflict in terms of air pollution. This study is significant in that it marked the first innovative incorporation of the scaling law model into an urban environmental risk study. It also offered a new perspective from which to reframe the urban PM2.5 pollution risk, along with the nationwide air environmental effort in China, which will benefit future research on multi-types of urban environmental issues.

Suggested Citation

  • Lei Yao & Wentian Xu & Ying Xu & Shuo Sun, 2022. "Examining the Potential Scaling Law in Urban PM2.5 Pollution Risks along with the Nationwide Air Environmental Effort in China," IJERPH, MDPI, vol. 19(8), pages 1-18, April.
    • Handle: RePEc:gam:jijerp:v:19:y:2022:i:8:p:4460-:d:789045
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