摘要
Abstract
Ten motor vehicles covering different types,emission standards,driving ranges and fuel types are selected as test samples.Urban roads are divided into three functional zones,core commercial areas,industrial areas and residential areas,and test routes are planned.The exhaust gas is collected by condensation drying method,and the volatile organic compounds(VOCs)samples are extracted by solid-phase microextraction technology for analysis.Targeted traffic control and urban air quality management plans are formulated.The results show that the concentration of VOCs emissions increases significantly in the core commercial area,while it decreases successively in the industrial area and the residential area.Freight vehicles are the main contributor to VOCs emissions,among which trucks have a relatively large contribution rate under medium-speed operating conditions.When the traffic volume reaches 900 vehicles per hour,the VOCs emission concentration in the core commercial area is the highest,reaching 7.8 μg/cm3.Under low-speed,medium-speed and high-speed operating conditions,the contribution rates of VOCs emissions from freight vehicles are 40%,32%and 25%,respectively.关键词
城市道路/汽车尾气/VOCs排放/空间分布特征Key words
urban roads/vehicle exhaust/VOCs emissions/spatial distribution characteristics分类
资源环境
