随着机动车保有量的快速增长，机动车污染物排放问题引起越来越多的关注。

Because of the rapid increase in motor vehicles, the problem of motor vehicle exhaust emissions has aroused more and more concern in China.

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随着城市机动车保有量的增加，机动车排放物在大气污染中所占的比例越来越大。

With the increasing number of city vehicles, the vehicular pollutant dispersion plays a more and more important role in air quality in city.

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论述了随着城市机动车保有量的急剧增长，机动车排放污染物对城市大气环境的影响也越来越大。

The influence of emission pollutants from automobile on the air environment is more and more serious with the increasing of total automobile number in city.

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