Murcia大学的研究人员测量了加油站附近空气中苯和己烷这两种与汽油有关的污染物的含量，并与普通汽车交通造成的污染数据进行了比较。
The researchers from the University of Murcia measured the levels of two common gasoline related pollutants, benzene and hexane, in the area around the stations.
与汽车相比，作为交通工具，自行车不会造成空气噪音污染这样的环境问题。
Compared with cars, as a traffic tool, bicycles don't cause environmental problems like air pollution and noise pollution.
空气污染通常是与主要的固定污染源，但排放的最大来源是移动来源主要是汽车。
Air pollution is often identified with major stationary sources, but the greatest source of emissions is mobile sources, mainly automobiles.
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