A region of the atmosphere with similar air quality and weather patterns, typically defined by geographic and meteorological boundaries; the airspace serving a particular geographic area.
Compound from 'air' and 'shed' (region/area), modeled after 'watershed,' created by environmental scientists and meteorologists in the mid-20th century.
Airsheds are invisible geography—pollution in one airshed affects entire regions, which is why acid rain from midwest factories fell on eastern forests, and why air quality is a regional, not local, problem.
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