国家干线公路移动源VOCs排放及臭氧生成潜势研究

基于国家干线公路4346个交通监测站日平均监测数据，采用移动源VOCs测算方法，建立国家干线移动源VOCs排放清单，使用最大增量反应活性（MIR）估算VOCs的臭氧生成潜势（OFP），并通过动态分段技术和核密度估计方法对臭氧生成强度的空间特征进行分析.结果表明，客车是国家干线移动源VOCs年排放量最大的源，占客货总排放量70.50%；广东省年排放量最大，占全国干线公路VOCs排放量的10.7%；G15沈海高速年排放量最大，占全国干线公路VOCs排放量的5.4%.烯烃和芳香烃为移动源OFP主要的贡献者，前十种有机污染物占干线移动源总OFP的67.29%.从客货车日均OFP强度上来看，受车流量影响，各干线差异明显.北京天津呈团簇状集聚，至石家庄一线为带状分布；济南淄博潍坊青岛一线呈弯月带状分布；南京苏州上海杭州呈团状，至上海又集聚；粤港澳大湾区以深圳为中心高度聚集；沈阳、郑州、西安、武汉、重庆等交通枢纽出现次一级强度集聚.

Emission and ozone formation potential of VOCs from mobile sources of national trunk highway

According to the VOCs calculating method, a vehicle emission inventory of VOCs had been established based on a daily average monitoring dataset of 4346 traffic stations in national trunk highways (NTHs). Ozone formation potential (OFP) of VOCs was estimated by the maximum incremental reactivity (MIR). A dynamic segmentation technology was used to the NTHs and then the intensity of OFP was calculated by kernel density analysis method to analyze its spatial distribution. The results show that annual emission of VOCs of passenger car was the largest one with its percentage up to 70.50%. Guangdong Province account for the most in all provinces and was 10.7%. G15 accounted for 5.4% and was the largest among all the NTHs. Olefins and aromatic hydrocarbons were the main contributors of OFP, the top ten key organic pollutants account for 67.29%. The intensity of daily average OFP of both freight and passenger vehicles varied largely in different highways and were affected by the traffic flow. Beijing and Tianjin showed a cluster concentration and took a belt distribution in Shijiazhuang. A meniscus distribution was along Jinan, Zibo, Weifang and Qingdao. Nanjing-Suzhou-Shanghai-and Hangzhou also showed a cluster distribution and converged in Shanghai. Shenzhen was a centre around Bay area of Yue-Gang-Ao. Shenyang, Zhengzhou, Xi'an, Wuhan, Chongqing and other hub cities showed a secondary intensity agglomerations.