摘要
机动车排放的尾气是城区重要的污染源,是形成光化学烟雾的直接因素。通过对南京东路王开照相馆——东海商厦断面的车流量、污染物浓度和气象要素的调查和监测,分析了南京东路交通流量的特征,估算了这一路段机动车尾气污染源源强,并利用分车道的经验公式计算了选定剖面的NO_x浓度分布。结果表明:(1)南京东路的车辆构成中出租车占很大比例。一天中车流量存在明显的变化,从西到东和从东到西车道的变化趋势一致,主要集中在白天和上半夜。(2)尾气中主要污染物CO的排放量远大于HC和NO_x,占总量的82.9％;NO_x排放量一天内变化相对平稳,占9.2％;HC占7.9％。(3)街谷旋涡对污染物NO_x分布有密切影响;NO_x浓度的日变化与源强日变化有关,并与冬、夏二季一天内的气象条件的变化密切相关。
Vehicle exhaust is the main pollution source and is a direct cause of photochemical smog. Based on investigation of vehicle flow, air pollutants monitoring and the meteorological features of East Nanjing Road, to analyze the characteristics of traffic flow, estimate the intensities of exhaust emission, and calculate the concentration distribution of NOx on the specific section using the experimental model. It concluded that, 1) taxi made up the main part of the vehicle in East Nanjing Road and the daily variation of traffic flow was obvious, the trend of the variation on the two tracks (from east to west and from west to east) were the same; 2) emission of CO was much more than HC and NOx, made up 82.9% of total emissions, the daily variation of NOx was comparatively stable, made up 9.2%, and HC 7.9%; 3) the vortexes in the street canyon have great effect on distribution of NOx, the daily variation of the concentration of NOx relates to the daily variation of the source and was closely related to the daily variation of the meteorological conditions in the two seasons——winter and summer.
出处
《上海环境科学》
CAS
CSCD
1997年第1期32-35,共4页
Shanghai Environmental Sciences
基金
上海市环保局下达的课题:"上海市典型街谷风场和污染扩散研究"的一部分
关键词
城市道路
废气
南京路
上海
汽车
空气污染
调查
Urban street Traffic Wastegas Gas dispersion Predicted model Nanjing Road Shanghai
