The short-term impacts of COVID-19 lockdown on urban air pollution in China

@article{He2020TheSI,
  title={The short-term impacts of COVID-19 lockdown on urban air pollution in China},
  author={Guojun He and Yuhang Pan and Takanao Tanaka},
  journal={Nature Sustainability},
  year={2020},
  pages={1-7}
}
To prevent the escalation of COVID-19 transmission, China locked down one-third of its cities, which strictly curtailed personal mobility and economic activities. Using comprehensive daily air quality data in China, we evaluated the impacts of these measures in terms of the Air Quality Index (AQI) and the concentrations of particulate matter with a diameter of less than 2.5 μm (PM 2.5 ). To infer their causal relationships, we employed difference-in-differences models that compare cities with… 
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