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The following digital product represents the Acid DepositionSensitivity of the Southern Appalachian Assessment Area. Areashaving various susceptibilities to acid deposition from airpollution are designated on a three tier ranking in the region ofthe Southern Appalachian Assessment (SAA). The assessment is beingconducted by Federal agencies that are members of the SouthernAppalachian Man and Biosphere (SAMAB) Cooperative. Sensitivities toacid deposition, ranked high, medium, and low are assigned on thebasis of bedrock compositions and their associated soils, and theircapacities to neutralize acid precipitation.