汽车废气造成的污染已提高了所有工业化国家城市人口的死亡率.

Pollution from car exhausts has raised death rates in cities all over the industrialised world.

市中心街道一般都被汽车废气所严重污染.

The downtown streets are usually seriousl polluted by the exhaust or autos.

将研究所得的技术应用于环境空气和汽车废气的分析.

The developed technique is applied to ambient air and automobile exhaust analysis.

诚然，有很多因素导致了现在的全球空气污染问题，但是不能否认的是汽车废气被归为最重要的因素之一。

Admittedly, there are various factors contributing to the current worldwide air pollution, but it is undeniable that the exhaust from automobiles is categorized as one of the major elements.

较高的交通量增长率会令减少汽车废气所带来的短期效益更快的消失。

The higher the rate of increase in traffic volumes , the sooner the benefits of short term reductions in emissions will be lost.