Ammonia in urban atmosphere can be substantially reduced by vehicle emission control:A case study in Shanghai, China

作     者：Can Wu Shaojun Lv Fanglin Wang Xiaodi Liu Jin Li Lang Liu Si Zhang Wei Du Shijie Liu Fan Zhang Jianjun Li Jingjing Meng Gehui Wang Can Wu;Shaojun Lu;Fanglin Wang;Xiaodi Liu;Jin Li;Lang Liu;Si Zhang;Wei Du;Shijie Liu;Fan Zhang;Jianjun Li;Jingjing Meng;Gehui Wang

作者机构：Key Lab of Geographic Information Science of the Ministry of EducationSchool of Geographic SciencesEast China Normal UniversityShanghai 200062China Institute for Environmental and Climate ResearchJinan UniversityGuangzhou 511443China School of Public Policy and AdministrationNorthwestern Polytechnical UniversityXi’an 710061China State Key Laboratory of Loess and Quaternary GeologyInstitute of Earth EnvironmentChinese Academy of SciencesXi’an 710061China School of Environment and PlanningLiaocheng UniversityLiaocheng 252000China Institute of Eco-ChongmingChenjia ZhenChongmingShanghai 202162China 

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

年 卷 期：2023年第126卷第4期

页      面：754-760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：financially supported by the National Natural Science Foundation of China(Nos. 42007202,41773117) the National Key R&D Plan, Ministry of Science and Technology of China(Mechanism and chemical process characterization of atmospheric particulate matter multi-isotope fractionation)(No. 2017YFC0212703) the Shanghai Science and Technology Innovation Action Plan(No.20dz1204011) the program of Institute of Eco-Chongming and ECNU Happiness Flower 

主　　题：Ammonia Non-agricultural sources Vehicle emission stable nitrogen isotope Organic tracers 

摘      要：To investigate the impact of emission controls on ammonia(NH_(3)) pollution in urban atmosphere, observation on NH_(3)(1 hr interval) was performed in Shanghai before, during and after the 2019 China International Import Expo (CIIE) event, along with measurements on inorganic ions, organic tracers and stable nitrogen isotope compositions of ammonium in PM_(2.5). NH_(3)during the CIIE period was 6.5±1.0μg/m^(3), which is 41% and 32% lower than that before and after the event, respectively. Such a decrease was largely ascribed to the emission controls in nonagricultural sources, of which contribution for measured NH_(3)in control phase abated by ~20% compared to that during uncontrol period. Molecular compositions of PAHs and hopanes further suggested a dominant role of the reduced vehicle emissions in the urban NH_(3)abatement during the CIIE period. Our results revealed that vehicle exhaust emission control is an effective way to mitigate NH_(3)pollution and improve air quality in Chinese urban areas.