南京市大气NOx扩散规律与防治对策研究

以实用的多源大气扩散模型计算了南京市点源、面源及流动源等各类污染源对地面及不同高度的关心点上N0。年平均浓度分布状况及其各类源的平均浓度贡献率，分析了影响NO。在大气中扩散的主要因素，着重对交通源的排污扩散进行研究。发现2000年南京交通源对大气中NO。浓度的贡献率在市区绝大多数地区已超过70％。另外，还将美国的CAI．INE3模式引入南京。模拟了2000年交通源的排污扩散状况。结果表明，经过修正的CAuNE3模式基本上能合理地描述城市道路N0。的污染状况。根据城市管理部门给出的3种NO。减排方案，计算了实施这些方案后大气中NO。污染状况。结果表明。不能继续维持南京市的交通现状。而必须实施机动车车辆控制或排放因子的限制。

RESEARCH OF ATMOSPHERIC NOx DIFFUSION LAW AND CONTROLLING METHOD IN NANJING

In this paper,a multi-source Gaussian dispersion air quality model has been used to calculate the NO x average contribution ratio of point pollution source,area source and moving source at each concerned spots.Among this three sources,urban motor vehicle emission contributed to 70 percent,and should be first controlled.We used the modified CALINE3 model to study the special distribution of vehicle source NO x concentrations in Nanjing.The three options that lead to cut NO x emission were brought forward,and the improved results were predicted.The research will provide decision-making support to Environmental Protection Department for NO x pollution source abatement in Nanjing.