airshed

[ air-shed ]
/ ˈɛərˌʃɛd /

noun Meteorology.

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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Origin of airshed

First recorded in 1910–15; air1 + (water)shed
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020

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