大连市中心区O_3污染特征分析

Pollution Characteristics of Ozone in Dalian Central Urban Area

本文采用2007年大连市环境自动监测数据，分析了城市中心区O3的污染特征。结果表明：O3质量浓度的最大值出现在午后15：00—17：00，比太阳辐射强度最大值的出现时间滞后2h左右；O3质量浓度的季节性变化十分显著，春夏季较高，秋季次之，冬季最低；汽车尾气是近地面O3污染的主要原因。

This article analyzed pollution characteristics of ozone in city central area using Dalian environmental automatic monitoring data in 2007. Results indicated that the maximum concentration of ozone occurred form 3 p.m. to 5 p. m. , which was later about two hours than the time of appearance of maximum solar radiation;the seasonal change Of ozone concentration was very notable, the concentration in spring and summer was higher, that in autumn took second place and in winter was lowest; the tail gas of automobile was the main reason of ozone pollution near the ground.