An airshed is a part of the atmosphere that behaves in a coherent way with respect to the dispersion of emissions. It typically forms an analytical or management unit. Also: A geographic boundary for air quality standards. Alternatively - An airshed is a geographical area where local topography and meteorology limit the dispersion of pollutants aw...
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http://en.wikipedia.org/wiki/Airshed
a geographical area within which the air frequently is confined or channeled, with all parts of the area thus being subject to similar conditions of air pollution.
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https://www.infoplease.com/dictionary/airshed
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