中文摘要：

通过现场道路尘土采集分析，道路里程、车流量、车型比例、年降雨天数等参数的调查，对桂林市中心区域各级（一级、二级、三级、四级和高速）道路扬尘细颗粒物（PM2．5）污染进行了研究，获得了各等级道路的路面尘负荷、排放因子并计算了PM2．5排放量。结果表明，桂林市中心区域整体道路交通欠发达，且道路扬尘对于PM2．5的贡献量较大，贡献量依次为：四级公路668．19 t、二级公路337．72 t、一级公路166．28 t、三级公路61．31 t、高速公路39．20 t。

英文摘要：

The pollution of fine particulate matter from different levels （level one ,two ,three and four and high speed） road dust in Guilin center area is studied by the parameters , such as collecting and analyzing the road dust , surveying road mileage ,traffic number ,vehicle proportions ,the annual days of rainfall ,and so on .From all of these ,each grade roads’ pavement dust load and the emission factors of PM2 .5 are gotten and the amount of dust is calculated .The results show that the overall road traffic in center area of the Guilin city is underdeveloped ,the road dust makes a significant contribution on PM2 .5 and the contribution amount follows this order：level four ,two ,one and three and highway is 668 .19 t ,337 .72 t , 166 .28 t ,61 .31 t and 39 .20 t respectively .