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airshed

[air-shed] /ˈɛərˌʃɛd/
noun, Meteorology
1.
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.
Origin of airshed
1910-1915
1910-15; air1 + (water)shed
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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