杭州拟控制机动车污染物总量，为大气解压。
Hangzhou intended to control the total amount of vehicle pollutants, in order to lessen the pressure of the atmosphere.
本文叙述了目前城市街道峡谷内机动车污染物扩散的研究现状。
This paper describes the current study on vehicle pollutants dispersion in the urban street canyon.
虽然近年来机动车排放的有害污染物大幅减少，但机动车的数量一直在稳步增加。
Although recent years have seen substantial reductions in noxious pollutants from individual motor vehicles, the number of such vehicles has been steadily increasing.
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