国道两侧环境空气中NO2的污染特征分析

摘要

Through the monitoring of NO2 concentration in ambient air on both sides of national highway 107 and da-ta analysis,it showed that on both sides of the national highway,NO2 concentration was negatively correlated with the distance,and positively with traffic flow.Green belt can absorb and block NO2 and below certain wind speed the absorption and purification decreased while wind speed increased. On both sides of national highway,without green belt,it shows that the higher the wind speed,the less NO2 density. With the absorbing and blocking of green belt, when the wind speed changes from zero to 2.5m/s,NO2 density distribution increases while wind speed goes higher.%通过对107国道两侧环境空气中NO2浓度的监测和数据分析,得出NO2浓度分布与距离呈负相关关系,与车流量呈负相关关系,绿化带对NO2有吸收、隔挡作用,而且在一定风速段内其吸收净化作用随风速的加大而有所降低.在没有绿化带的地段,NO2浓度分布随风速加大而降低;有了绿化带的吸收、隔挡作用,当风速变化在0~2.5m/s时,绿化带内区域NO2浓度分布随风速加大而增高.