airshed

 [air-shed]  

air·shed

   [air-shed]
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.
Origin:
1910–15; air1 + (water)shed
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Airshed is always a great word to know.
So is rain shadow. Does it mean:
precipitation consisting of small, slowly falling crystals of ice
a region in the lee of mountains that receives less rainfall than the region windward of the mountains
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