Yao Dan, Tang Guiqian, Sun Jie, Wang Yinghong, Yang Yuan, Wang Yiming, Liu Baoxian, He Hong, Wang Yuesi
Center for Excellence in Regional Atmospheric Environment, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China; State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, China; University of Chinese Academy of Sciences, Beijing 100049, China.
State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, China; University of Chinese Academy of Sciences, Beijing 100049, China.
J Environ Sci (China). 2022 Feb;112:210-217. doi: 10.1016/j.jes.2021.04.017. Epub 2021 Jun 5.
High loads of ground-level ozone have occurred with the implementation of the Air Pollution 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 results 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. Moreover, 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 reduction 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.
随着《大气污染防治行动计划》的实施，地面臭氧出现了高负荷情况。然而，前驱体非甲烷碳氢化合物（NMHCs）的长期时间变化却鲜有研究。在本研究中，我们基于2000年至2019年的环境监测数据，研究了北京NMHCs的演变情况。结果表明，2000年至2019年期间环境NMHCs的年变化可分为两个阶段。2000年至2009年期间，NMHCs的混合比迅速上升（每年1.76 ppbv），但从2009年至2019年呈下降趋势，下降速率为每年0.80 ppbv。此外，2009年之后烯烃和芳烃的显著减少导致丙烯当量浓度（PEC）急剧下降（每年-0.80 ppbv）。北京实施的减排措施有效降低了与车辆相关源的贡献，但溶剂使用和燃料消耗的贡献增加，这将成为未来北京挥发性有机物控制的重点。
