瑞丽城区一氧化碳污染的现状

CO Pollution in Urban Area in Ruili

经监测，瑞丽市城区街道空气中一氧化碳的日平均浓度己超过国家二级标准，其主要来源是汽车尾气排放，而且其浓度与汽车流量呈线性正相关。主导风与街道斜交，在街道峡谷内形成旋涡流场，使ＣＯ向背风面扩散并沿街道输送，导致局部测点浓度过高。目前控制ＣＯ浓度宜限制尾气超标汽车入城并合理分流入城汽车。

By monitoring, we know that CO daily average concentration is over Grade Two(National Standard)in the air of urban streets in Ruili. Exhaust from motor cars is the main source. The relationship between CO concentration and car flow is positive linear correlation. The leading wind obliquely crosses the streets so that it forms a vortex flow field. CO is diffusing toward lee side and spreading along the streets. It causes very high concentration at some monitoring points. Currently, to control CO concentration is to prevent vehicles with over standard exhaust coming into the city, and to split the flow of the vehicles.