山地城市平坡路段污染物浓度分布特性实测

为明确车辆排放污染物浓度在山地城市道路平坡路段的分布特性,以重庆市内8条典型平坡道路作为研究对象,采集了路侧不同横向距离的空气污染物浓度,分析了PM2.5、挥发性有机物(volatile organic compounds,VOCs)在平坡路段路侧不同横向距离的连续分布特征,以及不同时段、不同环境对污染物浓度的影响。结果表明:PM2.5和VOCs浓度随着路侧横向距离的改变而发生变化,但分别呈现不同的变化特征;高峰时段的污染物浓度高于平峰时段的污染物浓度;整体来说,路段的PM2.5浓度大于VOCs浓度,且PM2.5浓度分布比VOC_S浓度分布较分散;PM2.5对于环境的敏感度较强,VOCs对于环境的敏感度较差。

An Investigation on Distribution Characteristics of Pollutants in Flat Slope Section of Mountain City

To clarify the distribution characteristics of vehicle emission pollutant concentration (PM2.5 and VOCS) on the flat slope of mountainous city, taking eight typical roads in Chongqing as the research objects. The concentration of air pollutants at different lateral distances on the road sides was collected. The continuous distribution characteristics of PM2.5 and VOCS on different lateral distances on the side of the flat slope were analyzed, and the effects of different time periods and different environments on the concentration of pollutants were analyzed. The main findings of this research include the following. The PM2.5 and VOCS concentrations vary from the lateral distance between the roadside, but they show different characteristics. Concentration of pollutants at rush hours is higher than that at normal hours. Overall, the PM2.5 concentration of the road segment is greater than the VOCS concentration, and the PM2.5 concentration distribution is more dispersed than the VOCS concentration distribution. PM2.5 is more sensitive to the environment, and VOCS is less sensitive to the environment.