Stable Air: A motionless mass of air that holds instead of dispersing pollutants.
Stagnation: Lack of motion in a mass of air or water that holds pollutants in place.
instability Occurs when a rising air parcel becomes less dense than the surrounding air. Since its temperature will not cool as rapidly as the surrounding environment, it will continue to rise on its own. Contrasts with stable air.
 See also: Cells, Indicator, Organic compound, Drainage, Gas
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