Changes in China's anthropogenic emissions and air quality during the COVID-19 pandemic in 2020

作者：Bo Zheng, Qiang Zhang, Guannan Geng, Cuihong Chen, Qinren Shi, Mengshi Cui, Yu Lei, Kebin He · 发表于：Earth system science data · 年份：2021 · DOI：10.5194/essd-13-2895-2021 · 被引用次数：354 · 研究领域：Air Quality and Health Impacts、COVID-19 impact on air quality、Climate Change and Health Impacts

The COVID-19 pandemic lockdowns led to a sharp drop in socio-economic activities in China in 2020, including reductions in fossil fuel use, industry productions, and traffic volumes. The short-term impacts of lockdowns on China's air quality have been measured and reported, however, the changes in anthropogenic emissions have not yet been assessed quantitatively, which hinders our understanding of the causes of the air quality changes during COVID-19. Here, for the first time, we report the anthropogenic air pollutant emissions from mainland China by using a bottom-up approach based on the near-real-time data in 2020 and use the estimated emissions to simulate air quality changes with a chemical transport model. The COVID-19 lockdown was estimated to have reduced China's anthropogenic emissions substantially between January and March in 2020, with the largest reductions in February. Emissions of SO 2 , NO x , CO, non-methane volatile organic compounds (NMVOCs), and primary PM 2.5 were estimated to have decreased by 27 %, 36 %, 28 %, 31 %, and 24 %, respectively, in February 2020 compared to the same month in 2019. The reductions in anthropogenic emissions were dominated by the industry sector for SO 2 and PM 2.5 and were contributed to approximately equally by the industry and transportation sectors for NO x , CO, and NMVOCs. With the spread of coronavirus controlled, China's anthropogenic emissions rebounded in April and since then returned to the comparable levels of 2019 i...