This is because there is not enough wind to blow away all of the cars' exhaust fumes and other smoke from factories.

这是因为没有足够的风吹散所有汽车的废气，还有其它工厂排放的烟。

She waves, with irritation, towards the garage and the plastic tube on the floor spewing out exhaust fumes thicker and thicker against the ceiling.

她愤懑地用空出来的手指着车库、地上的塑料软管以及朝着房顶越飘越浓烈的尾气云。

There will be special pumps at regular intervals along the tunnel to clean the air and remove the exhaust fumes from it.

隧道沿线每隔一定时间就会有专门的泵来净化空气并清除其中的废气。