Urban transport is a major source of greenhouse gas emissions and a cause of ill-health due to air and noise pollution.
城市交通是温室气体排放的一个主要来源，也是空气和噪音污染造成健康状况不佳的一个原因。
With the growing increase of the retention of the vehicles in the city, the gas emitted from vehicles has become the most important source of the urban air pollution.
随着城市机动车保有量的不断增长，机动车尾气污染问题已经成为城市空气污染最重要的来源，控制机动车尾气污染也已经成为改善城市大气环境质量的当务之急。
To make quantitative analysis for air pollution situation in urban area is required in air pollution source control and air pollution emission total control.
污染源治理和大气污染总量控制的实施需要对城市进行大气污染现状的定量分析。
To make quantitative analysis for air pollution situation in urban area is required in air pollution source control and air pollution emission total control.
污染源治理和大气污染总量控制的实施需要对城市进行大气污染现状的定量分析。
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