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.
机动车排放颗粒物是重要的空气污染物。
Particles from vehicle emission are important air pollutants.
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.
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