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.

1910–15; air1 + (water)shed Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Example sentences
Airshed and watershed boundaries on the map can be clicked on or off in the legend to the left of the map.
Nonattainment designations are based on monitored concentrations within an airshed.
The coverage of the airshed still needs to be figured out in more detail and will depend on the goal of the study.
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