机动车排放污染扩散模式可分为高斯模式、经验模式、数值模拟模式和箱式模式。
The vehicle emission dispersion models can be classified into Gaussian model, empirical model, numerical simulation model and box model.
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.
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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