Wang Shuai, Wang Xiu-Yan, Yang Wen, Wang Yu-Yan, Bai Jin-Feng, Cheng Ying
College of Environmental Science and Engineering, Nankai University, Tianjin 300350, China.
Chinese Research Academy of Environmental Sciences, Beijing 100012, China.
Huan Jing Ke Xue. 2022 Mar 8;43(3):1277-1285. doi: 10.13227/j.hjkx.202106197.
In recent years, ozone pollution has been growing increasingly serious in the urban areas of China. Volatile organic compounds (VOCs) are important precursors of O formation, which is of great significance to studying the main characteristics and sources of VOCs for controlling O pollution. In this study, we conducted online VOCs observation in Zibo City from May to September in 2019, monitoring 56 species in total. During the observation, the over-standard rate of ozone was up to 67.8%, the average of (VOCs) was 140.71 μg·m, and the concentration of VOCs in the ozone over standard days was 1.04 times that on the non-standard days. The rank of VOC classes was aromatic hydrocarbons>alkanes>alkenes>alkynes. Among them, 1,3,5-tritoluene, -ethyltoluene, 1-butene, and -hexane achieved high emission in the exceeding O and non-exceeding days. Aromatic hydrocarbon and alkenes contributed more to the potential of ozone formation. According to the PMF source analysis results, VOCs sources in the urban area mainly included motor vehicle sources, fixed combustion sources, solvent sources, process sources, and natural plant sources, among which motor vehicle sources were the most important source of VOCs in the urban area. In addition, motor vehicle sources accounted for 32.3%, and fixed combustion sources accounted for 24.2% on days when ozone exceeded the standard, which increased by 3.3% and 6.9%, respectively, compared with those on days when ozone did not exceed the standard. However, the proportion of solvent sources and process sources decreased by 5.1% when ozone exceeded the standard compared with that on a non-standard day.
近年来，中国城市地区的臭氧污染日益严重。挥发性有机化合物（VOCs）是臭氧形成的重要前体物，研究VOCs的主要特征和来源对于控制臭氧污染具有重要意义。本研究于2019年5月至9月在淄博市进行了VOCs在线观测，共监测了56种物质。观测期间，臭氧超标率高达67.8%，VOCs平均浓度为140.71μg·m ，臭氧超标日的VOCs浓度是非超标日的1.04倍。VOCs类别排序为芳香烃>烷烃>烯烃>炔烃。其中，1,3,5-三甲苯、乙苯、1-丁烯和己烷在臭氧超标日和非超标日排放均较高。芳香烃和烯烃对臭氧生成潜势的贡献更大。根据PMF源解析结果，城区VOCs来源主要包括机动车源、固定燃烧源、溶剂源、工艺源和天然植物源，其中机动车源是城区VOCs的最重要来源。此外，臭氧超标日机动车源占32.3%，固定燃烧源占24.2%，与臭氧未超标日相比分别增加了3.3%和6.9%。然而，臭氧超标日溶剂源和工艺源的占比与非超标日相比下降了5.1%。
