太原市夏季大气VOCs污染特征及臭氧生成潜势

2018年8月采集太原市大气样品，分析太原市夏季大气VOCs的污染特征，并利用最大增量反应活性系数法（MIR系数法）估算了VOCs的臭氧生成潜势（OFP）.结果表明，太原市夏季大气VOCs浓度为17.36~89.60μg/m³，其中烷烃占比58.01%、芳香烃占比20.06%、烯烃占比16.52%、炔烃占比5.40%.大气VOCs浓度变化表现为明显的早晚双高峰特征，且以早高峰影响为主.OFP分析显示，烷烃、烯烃、芳香烃、炔烃分别占总OFP的19.16%、47.74%、31.75%、1.35%，C₃~C₅类烯烃是活性较高的物种，对O₃生成贡献较大.

Pollution characteristics and ozone formation potential of ambient VOCs in summer in Taiyuan

In August 2018, air samples were collected in Taiyuan. The pollution characteristics of ambient volatile organic compounds (VOCs) were analyzed and the ozone formation potential (OFP) of VOCs was also calculated by the maximum incremental reactivity (MIR). The results showed that the VOCs concentration in summer ranged from 17.36μg/m³ to 89.60μg/m³. And the average proportions of alkanes, aromatics, alkenes, alkynes were 58.01%, 20.06%, 16.52%, 5.40%, respectively. The diurnal variations of VOCs concentrations showed obvious bimodal distribution in the morning and evening, and the influence of morning peaks was more significant. Alkanes, alkenes, aromatics and alkynes contributed 19.16%, 47.74%, 31.75% and 1.35% to the total OFP, respectively. C₃~C₅ alkenes have high activity, which greatly contribute to O₃ formation.