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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 away from the area. 
- Okrainetz, Glen. "Air Quality Management in British Columbia". BC Lung Ass'n. Retrieved July 6, 2013.
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