Heavy haze pollution during the COVID-19 lockdown in the Beijing-Tianjin-Hebei region,China

作     者：Xin Zhang Zhongzhi Zhang Zhisheng Xiao Guigang Tang Hong Li Rui Gao Xu Dao Yeyao Wang Wenxing Wang Xin Zhang;Zhongzhi Zhang;Zhisheng Xiao;Guigang Tang;Hong Li;Rui Gao;Xu Dao;Yeyao Wang;Wenxing Wang

作者机构：Environment Research InstituteShandong UniversityQingdao 266237China State Key Laboratory of Environmental Criteria and Risk AssessmentChinese Research Academy of Environmental SciencesBeijing 100012China China National Environmental Monitoring CentreBeijing 100012China 

出 版 物：《Journal of Environmental Sciences》 (环境科学学报（英文版）)

年 卷 期：2022年第34卷第4期

页      面：170-178页

核心收录：

学科分类：07[理学] 070602[理学-大气物理学与大气环境] 0706[理学-大气科学] 

基　　金：supported by the National Key R&D Program of China(Nos.2019YFC0214800 and 2018YFC0213203) the Fundamental Research Funds for Central Public Welfare Scientific Research Institutes of China,Chinese Research Academy of Environmental Sciences(No.2019YSKY-012) 

主　　题：COVID-19 lockdown Heavy haze pollution Chemical compositions Source apportionment Beijing-Tianjin-Hebei region 

摘      要：To investigate the characteristics of particulate matter with an aerodynamic diameter less than 2.5μm(PM_(2.5))and its chemical compositions in the Beijing-Tianjin-Hebei(BTH)region of China during the novel coronavirus disease(COVID-19)lockdown,the ground-based data of PM_(2.5),trace gases,water-soluble inorganic ions,and organic and elemental carbon were analyzed in three typical cities(Beijing,Tianjin,and Baoding)in the BTH region of China from 5-15 February *** PM_(2.5)source apportionment was established by combining the weather research and forecasting model and comprehensive air quality model with extensions(WRF-CAMx).The results showed that the maximum daily PM_(2.5)concentration reached the heavy pollution level(150μg/m^(3))in the above three *** sum concentration of SO_(4)^(2-),NO_(3)^(-)and NH_(4)^(+)played a dominant position in PM_(2.5)chemical compositions of Beijing,Tianjin,and Baoding;secondary transformation of gaseous pollutants contributed significantly to PM_(2.5)generation,and the secondary transformation was enhanced as the increased PM_(2.5)*** results of WRF-CAMx showed obviously inter-transport of PM_(2.5)in the BTH region;the contribution of transportation source decreased significantly than previous reports in Beijing,Tianjin,and Baoding during the COVID-19 lockdown;but the contribution of industrial and residential emission sources increased significantly with the increase of PM_(2.5)concentration,and industry emission sources contributed the most to PM_(2.5)***,control policies should be devoted to reducing industrial emissions and regional joint control strategies to mitigate haze pollution.