因此，控制机动车尾气污染是当务之急。

So it is the most important to control automobile exhaust gas pollution.

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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。

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.

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控制汽车尾气量的增加，是减少汽车废气污染改善人类生活环境的重要措施。

How to control the increase of the discharging amount of automobile end gas is the important measure to reduce automobile end gas pollution and improve living environment.

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