Air pollution is often identified with major stationary sources, but the greatest source of emissions is mobilesources, mainly automobiles.
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。
2
Complex terrain of network design, dust source points sealed design and the choice of devices, mobilesources dust-dust control and grass control are the key link.
The report covers 181 air toxics and diesel particulate matter and estimates risks from exposure to emissions from industrial sources and mobilesources such as cars and trucks.