上海市NO_x分布状况及其影响因素

Distribution ot NO_x Pollution in Shanghai and Its Impact Factors

以一种简易可靠的大气NO_x测量方法,大范围地调查了上海市区的NO_x浓度状况。结果表明,上海市NO_x浓度分布状况,在不同性质的街区、不同地段、不同道路之间,存在明显差异。居民区大气中NO_x的浓度可达到国家一级标准要求,但市区各道路网超标严重,平均是一级标准的1.7倍,道路网NO_x的分布总体呈东南低、北和西北高的梯次。影响城市NO_x浓度分布的主要因素有:交通、风力、地形、绿化等,在城市建设规划时,应充分考虑它们的作用,特别是避免高楼临街的现象。

A simple and reliable method has been used to measure the concentration of NOx in Shanghai urban atmosphere. The results showed that in Shanghai, NOx pollution was obviously difference between respective regions and roads. Pollution in residential quarter was not serious, which below the first grade of ambient air quality standard of China. While in Shanghai proper, the pollutant concentration was greatly exceeded at every road web. The gradient distribution showed higher in the north and north west, and lower in the south east. The factors which influence NOx distribution are traffic, wind strength, topography and green cover etc, therefore the urban construction planning should put these factors into consideration.