【摘要】 2021年8月18日至27日通过离线采样对某市大气中的挥发性有机物（volatile organic compounds, VOCs）浓度水平和组分特征进行分析，并通过来源解析和O₃生成活性评估探究VOCs排放源对O₃生成的影响。结果发现：采样期间环境空气中VOCs主要组分为含氧VOCs（OVOCs）和烷烃；VOCs单日浓度谷值与NO₂浓度谷值、O₃浓度峰值同时出现；VOCs的主要来源为汽车尾气排放、天然气/液化石油气（NG/LPG）的使用和挥发、工业排放和生物排放；通过O₃活性评估发现，关键物种为间乙基甲苯、乙苯、间二甲苯、1,2,3-三甲苯和异戊二烯等，烯烃、含氧VOCs类物质O₃活性较高；机动车是O₃生成影响最大的排放源。更多还原

【Abstract】 The concentration and composition characteristics of VOCs in a city atmosphere were off-line sampled during Augest 18 th to 27 th, 2021. The effect of VOCs emission sources on the production of ozone was studied through VOCs source apportionment and ozone production activity appraisal.Results showed that OVOCsand alkanes were main components of sample. The concentration of ozone reached peak value while the concentration of VOCs and NO₂ reached valley value. The four principal sources of VOCs are: vehicle exhaust emission, use and volatilization of NG/LPG, industrial and biogenic emission.3-ethyltoluene, ethylbenzene, m-xylene, 1,2,3-trimethylbenzene and isoprene are the most active species in ozone production. Among the four VOCs sources, vehicle exhaust contributes to the most production of ozone.更多还原