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.
作为大气污染气体的主要来源之一的固定污染源的烟气排放就成为监测和控制的重点。
As the main source of air pollution, flue gas emissions have become the focus of the monitoring and control.
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