Annual nonmethane hydrocarbon trends in Beijing from 2000 to 2019 |
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| Authors: | Dan Yao Guiqian Tang Jie Sun Yinghong Wang Yuan Yang Yiming Wang Baoxian Liu Hong He Yuesi Wang |
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| Institution: | 1. Center for Excellence in Regional Atmospheric Environment, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China;2. State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, China;3. State Key Joint Laboratory of Environment Simulation and Pollution Control, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China;4. School of Environment, Tsinghua University, Beijing 100084, China;5. Beijing Key Laboratory of Airborne Particulate Matter Monitoring Technology, Beijing Municipal Environmental Monitoring Center, Beijing 100048, China;6. University of Chinese Academy of Sciences, Beijing 100049, China |
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| Abstract: | High loads of ground-level ozone have occurred with the implementation of the Air Poilu-tion Prevention and Control Action Plan.However,the long temporal variation in precursor nonmethane hydrocarbons (NMHCs) has rarely been studied.In this study,we examined the evolution of NMHCs in Beijing based on ambient measurements from 2000 to 2019.The re-sults indicated that the annual variation of ambient NMHCs during 2000 and 2019 could be divided into two stages.The mixing ratios of NMHCs rapidly rose during 2000 and 2009 (1.76 ppbv/year) but exhibited a downward trend from 2009 to 2019 at rate of 0.80 ppbv/yr.More-over,the notable decrease in alkenes and aromatics after 2009 led to a sharp decrease in the propylene-equivalent concentration (PEC) (-0.80 ppbv/year).Implementation of emission re-duction measures in Beijing have effectively reduced the contribution of vehicle-related sources,but the contribution of solvent usage and fuel consumption increased,which will become the focus of VOC control in Beijing in the future. |
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| Keywords: | Beijing NMHCs Reactivity Temporal variation |
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