Airshed
Encyclopedia
An airshed is a part of the atmosphere
Earth's atmosphere
The atmosphere of Earth is a layer of gases surrounding the planet Earth that is retained by Earth's gravity. The atmosphere protects life on Earth by absorbing ultraviolet solar radiation, warming the surface through heat retention , and reducing temperature extremes between day and night...

 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.

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