成都市新都区城市主干道挥发性有机物分布特征研究

Research on Distribution Characteristics of Volatile Organic Compounds in Urban Trunk Roads of Chengdu

选择新都区的部分城市主干道两侧大气中VOCs(挥发性有机物)含量进行检测,了解新都区城区空气质量,分析车流量、降水、温度等条件对不同道路类型(相对宽阔型、高层峡谷型、交叉口道路)两侧空气中VOCs浓度的影响。车流量是影响VOCs浓度偏高的主要原因,一天不同时段的浓度变化呈双峰型,高浓度出现在早晨和傍晚。大气降水会使VOCs浓度降低,温度对其影响不大,温度的骤降通常伴随降水,使VOCs浓度下降,不同道路类型其下降的幅度存在差异,相对开阔型下降幅度最大。夏季,不同道路类型两侧空气中VOCs浓度的趋势相似,浓度差异大;在冬季三种道路类型两侧空气中VOCs浓度的趋势相同,浓度差异小。

This paper analyzes t[ae atmospheric VOCs on both sides of some urban main road of Xindu Distric, Chengdu City to understand the urban air quality, and the impacts of traffic, precipitation, temperature, road types （ relatively wide, high can- yon road, intersection） on the VOC concentrations. Traffic is a major cause for high VOCs concentration. The daily concentration shows bimodal type, high concentration appears in the morning and the evening. Atmospheric precipitation will reduce VOCs con- centration, temperature impact is not big. The temperature plummets usually due to precipitation, decreased concentration of VOCs, differences between different road to the extent of the decline, biggest drop in a relatively open type. Different types of road on both sides of the levels of VOCs in the air similar trend, the concentration difference is great in the summer. In winter, the VOC variation for types of roads show similar trends with little difference in concentration difference.