1. Large contributions of emission reductions and meteorological conditions to the abatement of PM2.5 in Beijing during the 24th Winter Olympic Games in 2022
- Author
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Yaping Jiang, Shaocai Yu, Xue Chen, Yibo Zhang, Mengying Li, Zhen Li, Zhe Song, Pengfei Li, Xiaoye Zhang, Eric Lichtfouse, Daniel Rosenfeld, Zhejiang University, Agricultural University of Hebei, Centre européen de recherche et d'enseignement des géosciences de l'environnement (CEREGE), Institut de Recherche pour le Développement (IRD)-Aix Marseille Université (AMU)-Collège de France (CdF (institution))-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE), The Hebrew University of Jerusalem (HUJ), and National Natu-ral Science Foundation of China (Nos. 42175084, 21577126,and 41561144004), the Department of Science and Technol-ogy of China (Nos. 2018YFC0213506, 2018YFC0213503, and2016YFC0202702) and the National Research Program for KeyIssues in Air Pollution Control in China (No. DQGG0107). Partof this work was also supported by the 'Zhejiang 1000 TalentPlan' and Research Center for Air Pollution and Health in Zhe-jiang University. Pengfei Li is supported by the National Nat-ural Science Foundation of China (No. 22006030), the Initia-tion Fund for Introducing Talents of Hebei Agricultural Uni-versity (412201904), and the Hebei Youth Top Q15 Fund (No.BJ2020032)
- Subjects
China ,Environmental Engineering ,air ,Winter Olympic games 2022 ,PM2.5 ,General Medicine ,air quality ,[SDU]Sciences of the Universe [physics] ,trajectory ,Beijing ,[SDE]Environmental Sciences ,pollution ,Environmental Chemistry ,General Environmental Science - Abstract
International audience; To guarantee the blue skies for the 2022 Winter Olympics held in Beijing and Zhangjiakou from February 4 to 20, Beijing and its surrounding areas adopted a series of emission control measures. This provides an opportunity to determine the impacts of large-scale temporary control measures on the air quality in Beijing during this special period. Here, we applied the WRF-CMAQ model to quantify the contributions of emission reduction measures and meteorological conditions. Results show that meteorological conditions in 2022 decreased PM2.5 in Beijing by 6.9 and 11.8 μg/m3 relative to 2021 under the scenarios with and without emission reductions, respectively. Strict emission reduction measures implemented in Beijing and seven neighboring provinces resulted in an average decrease of 13.0 μg/m3 (-41.2%) in PM2.5 in Beijing. Over the entire period, local emission reductions contributed more to good air quality in Beijing than nonlocal emission reductions. Under the emission reduction scenario, local, controlled regions, other regions, and boundary conditions contributed 47.7%, 42.0%, 5.3%, and 5.0% to the PM2.5 concentrations in Beijing, respectively. The results indicate that during the cleaning period with the air masses from the northwest, the abatements of PM2.5 were mainly caused by local emission reductions. However, during the potential pollution period with the air masses from the east-northeast and west-southwest, the abatements of PM2.5 were caused by both local and nonlocal emission reductions almost equally. This implies that regional coordinated prevention and control strategies need to be arranged scientifically and rationally when heavy pollution events are forecasted.
- Published
- 2024