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 

机构地区：[1]Key Lab of Geographic Information Science of the Ministry of Education,School of Geographic Sciences,East China Normal University,Shanghai 200062,China [2]Institute for Environmental and Climate Research,Jinan University,Guangzhou 511443,China [3]School of Public Policy and Administration,Northwestern Polytechnical University,Xi’an 710061,China [4]State Key Laboratory of Loess and Quaternary Geology,Institute of Earth Environment,Chinese Academy of Sciences,Xi’an 710061,China [5]School of Environment and Planning,Liaocheng University,Liaocheng 252000,China [6]Institute of Eco-Chongming,Chenjia Zhen,Chongming,Shanghai 202162,China

出　　处：《Journal of Environmental Sciences》2023年第4期754-760,共7页环境科学学报（英文版）

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。

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.

关 键 词：AMMONIA Non-agricultural sources Vehicle emission stable nitrogen isotope Organic tracers 

分 类 号：X51[环境科学与工程—环境工程]