文章在总结城市交通污染产生原因的基础上，通过最优污染水平控制模型的建立，分析了减少交通污染的途径和方法。
The paper discusses the causes, how to build up a best pollution-control model and possible approaches to reduce traffic pollution.
应用极大值原理，得出了外部性期权最优控污成本和污染评价水平的求解方案。
Using maximal principle the found solution scheme of the exterior options optimization pollution-control cost and pollution-evaluation level has been derived.
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