Abstract Based on the detailed data of volatile organic compounds (VOCs) with 102 components measured continuously from September 2016 to August 2017 in Wuhan, the pollution characteristics, source apportionment, chemical reactivity and contribution to O3 formation were analysed. The results revealed that the annual average concentration of total VOCs (TVOCs) was 34.65 ppbv. Alkanes were the species with the largest concentration, which accounted for 45.88% of TVOCs, and propane, ethane and ethene were the most abundant components. Diagnostic ratios (toluene/benzene, typical VOC species/acetylene) showed that vehicle exhaust emissions had significant effects on VOCs. Eight major sources were identified by positive matrix factorization (PMF), which included vehicular exhaust (24.42%), industrial sources (16.43%), coal burning (14.18%), solvent usage in painting/coating (13.48%), liquefied petroleum gas (LPG) usage (12.57%), fuel evaporation (11.34%), biomass burning (5.11%) and biogenic sources (2.47%). In addition, industrial sources, vehicle exhaust and LPG usage were the main sources that significantly aggravated VOC pollution in Wuhan. Potential source contribution function (PSCF) results showed that local pollution sources were the main sources influencing VOC pollution in Wuhan. The results of Empirical Kinetic Modelling Approach (EKMA) showed that Wuhan belongs to a VOC limited area. Finally, the results of the OH radical loss rate (LOH) and ozone formation potential (OFP) showed that alkenes were the species with the largest amount of chemical activity, in which the highest OH radical loss rate was 42.56%. Simultaneously, alkenes contributed the most to O3 formation, which accounted for 48.34%. The results can provide references for local governments regarding control strategies of VOCs and O3 pollution.

中文翻译：

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华中地区武汉VOCs的特征、来源解析及对臭氧形成的贡献

摘要 基于武汉市2016年9月至2017年8月连续测量的102种挥发性有机化合物（VOCs）的详细数据，分析了其污染特征、来源解析、化学反应性及对O3形成的贡献。结果显示，总VOCs（TVOCs）的年平均浓度为34.65 ppbv。烷烃是浓度最大的物种，占 TVOC 的 45.88%，丙烷、乙烷和乙烯是最丰富的成分。诊断比率（甲苯/苯、典型的 VOC 种类/乙炔）表明车辆尾气排放对 VOC 有显着影响。通过正矩阵分解（PMF）确定了八个主要来源，其中包括汽车尾气（24.42%）、工业源（16.43%）、燃煤（14.18%）、油漆/涂料中的溶剂用量 (13.48%)、液化石油气 (LPG) 用量 (12.57%)、燃料蒸发 (11.34%)、生物质燃烧 (5.11%) 和生物源 (2.47%)。此外，工业源、汽车尾气和液化石油气的使用是显着加剧武汉市VOC污染的主要来源。潜在源贡献函数（PSCF）结果表明，当地污染源是影响武汉市VOC污染的主要来源。Empirical Kinetic Modeling Approach (EKMA) 的结果表明，武汉属于 VOC 限制区。最后，OH自由基损失率（LOH）和臭氧形成势（OFP）的结果表明，烯烃是化学活性量最大的物种，其中OH自由基损失率最高，为42.56%。同时，烯烃对 O3 的形成贡献最大，其中占比 48.34%。研究结果可为地方政府制定VOCs和O3污染控制策略提供参考。