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10.1016/j.buildenv.2021.108231

http://scihub22266oqcxt.onion/10.1016/j.buildenv.2021.108231
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suck abstract from ncbi


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pmid34393324      Build+Environ 2021 ; 205 (ä): 108231
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  • Characterizing the interruption-recovery patterns of urban air pollution under the COVID-19 lockdown in China #MMPMID34393324
  • Cai WJ; Wang HW; Wu CL; Lu KF; Peng ZR; He HD
  • Build Environ 2021[Nov]; 205 (ä): 108231 PMID34393324show ga
  • The COVID-19 pandemic provides an opportunity to study the effects of urban lockdown policies on the variation in pollutant concentrations and to characterize the recovery patterns of urban air pollution under the interruption of COVID-19 lockdown policies. In this paper, interruption-recovery models and regression discontinuity design were developed to characterize air pollution interruption-recovery patterns and analyze environmental impacts of the COVID-19 lockdown, using air pollution data from four Chinese metropolises (i.e., Shanghai, Wuhan, Tianjin, and Guangzhou). The results revealed the air pollutant interruption-recovery curve represented by the three lockdown response periods (Level I, Level II and Level III) during COVID-19. The curve decreased during Level I (A 25.3%-48.8% drop in the concentration of NO(2) has been observed in the four metropolises compared with the same period in 2018-2019.), then recovered around reopening, but decreased again during Level III. Moreover, the interruption-recovery curve of the year-on-year air pollution difference suggests a process of first decreasing during Level I and gradually recovering to a new equilibrium during Level III (e.g., the unit cumulative difference of NO(2) mass concentrations in Shanghai was 21.7, 22.5, 11.3 (mug/m(3)) during Level I, II, and III and other metropolises shared similar results). Our findings reveal general trends in the air quality externality of different lockdown policies, hence could provide valuable insights into air pollutant interruption-recovery patterns and clear scientific guides for policymakers to estimate the effect of different lockdown policies on urban air quality.
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