For Mobile Source we have terms and definitions in 3 topics. The topics are Air Quality, Atmospheric Chemistry and Environment.

A moving source of air pollution; includes cars, trucks, motorcycles, and airplanes
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(also call non-point source) consist of emissions from on-road and off-road sources. Cars, light, medium and heavy-duty trucks are considered on-road mobile sources, off-road mobile sources; are tractors, lawn mowers, boats, and airplanes. Although the off road sources usually put out more pollution per hour of work than the on-road, the great number of on-road source put out a larger overall volume into the atmosphere.
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Any non-stationary source of air pollution such as cars, trucks, motorcycles, buses, airplanes, and locomotives.
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