奥运期间北京市交通污染的DOAS监测与分析

Analysis of traffic emissions during the period of 2008 Beijing Olympic Games based on the DOAS monitoring

采用差分吸收光谱(DOAS)这一光学遥感技术,对2008年奥运期间北京海淀区福寿寺桥位置的交通排放进行实时监测,获得自2008年7月6日至9月21日大气主要污染物SO_2、NO_2、光化学烟雾的重要产物0_3和苯的体积分数,并与微脉冲雷达获得的车流量进行数据融合,评估机动车对奥运期间北京空气质量的影响。结果表明,监测位置NO_2和苯释放源主要为交通排放,0_3的生成主要与其前体物和光辐射相关,而SO_2和车流量没有明显的相关性。研究表明,机动车排放仍是北京主要污染源之一。

The paper is aimed to report the results of our analysis of traffic exhaust emissions during the period of 2008 Beijing Olympic Games with the samples collected and measured with a differential optical absorption spectroscopy （DOAS）. As a matter of fact, we were appointed to evaluate the environmental quality during the Olympics Games period by monitoring the main pollutants caused by such traffic exhausts. With the work going on, we found that NO2 , SO2, 03 and benzene were the chief pollutants of traffic exhausts. The simultaneous measuring and monitoring activities done from July 6 to September 21 of the year at the monitoring spot near Fushousi Bridge of Haidian District, Beijing, made us find that, while monitoring the traffic flow with a micro-impulse Lidar at the spot, we collected and analyzed the diurnal variation characteristics of the pollutants and their sources. Moreover, focus has been put on the average daily concentrations of NO2, SO2, 03 and benzene emitted during the period. Traffic restrictions reduce the levels of NO2 concentrations and benzene concentrations. Therefore, the automobile exhaust is the main source of NO2 and benzene at monitoring site. There are the remarkable correlation between O3 concentration with its precursor and radiation. But the correlation between the SO2 concentration and the traffic flux proved less remarkable. Thus, the car exhaust proved to be the main source of the pollutant during the Games period. Needless to say, the traffic restrictions turned to be of great importance to keep a proper living environment.