城市快车道隧道中主要污染物的分布特征

Distribution characteristics of air pollutants in urban expressway tunnel

为了探究真实的半封闭环境下汽车尾气污染物的分布特征以及它们对臭氧和二次颗粒物的影响,本文对贵阳市黔灵山隧道的汽车尾气污染物进行了综合监测和采样,得到了隧道进出口的NO_(x)、SO_(2)、O_(3)、VOCs、颗粒物分粒径的质量浓度,VOCs的成分谱以及PM_(2.5)的离子组分。监测结果表明隧道内高浓度的NOx对臭氧会产生滴定效应,颗粒物中有机组分的日均占比超过50%。分析结果表明汽车尾气对隧道内的NOx、VOCs、颗粒物以及臭氧的影响比较大,而对SO 2的影响则相对较小。

In order to explore the distribution characteristics of vehicle exhaust pollutants in a real semi-closed environment and their impact on ozone and secondary particulate matter,this paper conducted comprehensive monitoring and sampling of vehicle exhaust pollutants in the Qianlingshan Tunnel in Guiyang,the mass concentration of NOx,SO_(2),O_(3),VOCs,particle size,composition of VOCs and ion composition of PM_(2.5) were obtained in entrance and exit of the tunnel.The monitoring results show that the high concentration of NOx in the tunnel will have a titration effect on ozone,and the average daily proportion of organic components in particulate matter exceeds 50%.The analysis results suggest that the impact of vehicle exhaust gas on the NOx,VOCs,particulate matter and ozone in the tunnel is relatively large,while the impact on SO_(2) is relatively small.