Characteristics of PM_(2.5) pollution in Beijing after the improvement of air quality

作     者：Xiaojuan Huang Guiqian Tang Junke Zhang Baoxian Liu Chao Liu Jin Zhang Leilei Cong Mengtian Cheng Guangxuan Yan Wenkang Gao Yinghong Wang Yuesi Wang Xiaojuan Huang;Guiqian Tang;Junke Zhang;Baoxian Liu;Chao Liu;Jin Zhang;Leilei Cong;Mengtian Cheng;Guangxuan Yan;Wenkang Gao;Yinghong Wang;Yuesi Wang

作者机构：Plateau Atmosphere and Environment Key Laboratory of Sichuan ProvinceSchool of Atmospheric SciencesChengdu University of Information TechnologyChengdu 610225China State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry(LAPC)Institute of Atmospheric PhysicsChinese Academy of SciencesBeijing 100029China Faculty of Geosciences and Environmental EngineeringSouthiuest Jiaotong UniversityChengdu 611756China Beijing Municipal Environmental Monitoring CentreBeijing 100048China Fengtai District Ecology and Environment BureauBeijing 100071China School of EnvironmentHenan Normal UniuersityKey Laboratory Jor YellouRiuer and Huai Riuer Water Environment and Pollution ControlMinistry of EducationHenan Key Laboratory/or EnvironmentaI Pollution ControlXinxiang 453007China 

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

年 卷 期：2021年第33卷第2期

页      面：1-10页

核心收录：

学科分类：0830[工学-环境科学与工程（可授工学、理学、农学学位）] 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：the National Natural Science Foundation of China(Nos.41805095,41705113,41877312) the Sichuan Science and Technology Program(Nos.2018SZ0288 and 2019YFS0476) the National Research Program for Key Is-sues in Air Pollution Control(DQGG0101) the Beijing Ma-jor Science and Technology Project(Z181100005418014) 

主　　题：PM_(2.5) Seasonal variations Chemical composition Source apportionment Pollution evolution 

摘      要：Following the implementation of the strictest clean air policies to date in Beijing,the physicochemical characteristics and sources of PM_(2.5) have changed over the past few *** improve pollution reduction policies and subsequent air quality further,it is necessary to explore the changes in PM_(2.5) over *** this study,over one year(2017-2018)field study based on filter sampling(TH-150C;Wuhan Tianhong,China)was conducted in Fengtai District,Beijing,revealed that the annual average PM_(2.5) concentration(64.8±43.1μg/m^3)was significantly lower than in previous years and the highest PM_(2.5) concentration occurred in spring(84.4±59.9μg/m^3).Secondary nitrate was the largest source and accounted for 25.7%of the measured PM_(2.5).Vehicular emission,the second largest source(17.6%),deserves more attention when considering the increase in the number of motor vehicles and its contribution to gaseous *** addition,the contribution from coal combustion to PM_(2.5) decreased *** weekends,the contribution from EC and NO3−increased whereas the contributions from SO4^2−,OM,and trace elements decreased,compared with *** the period of residential heating,PM_(2.5) mass decreased by 23.1%,compared with non-heating period,while the contributions from coal combustion and vehicular emission,and related species *** the aggravation of pollution,the contribution of vehicular emission and secondary sulfate increased and then decreased,while the contribution of NO3−and secondary nitrate continued to increase,and accounted for 34.0%and 57.5%of the PM_(2.5) during the heavily polluted days,respectively.