An airshed is a part of the atmosphere 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. Alternatively - An airshed is a geographical area where local topography and meteorology limit the dispersion of pollutants away from the area.
The numerical value of airshed in Chaldean Numerology is: 3
The numerical value of airshed in Pythagorean Numerology is: 1