Stability Classes, Atmospheric
Stability Classes, Atmospheric : Pasquill stability class (ranging from "A" to "F") are meteorological categories of atmospheric conditions. Pasquill stability Class A represents unstable conditions under which there are strong sunlight, clear skies, and high levels of turbulence in the atmosphere, conditions that promote rapid mixing and dispersal of airborne contaminants. At the other extreme, Class F represents light, steady winds, fairly clear nighttime skies, and low levels of turbulence. Airborne contaminants mix and disperse far more slowly with air under these conditions, and may travel downwind at hazardous concentrations that in other cases. Stability Class D, midway between A and F, is used for neutral conditions, applicable to heavy overcast, daytime or nighttime
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