The effect of the discontinuity in the wind field between land and sea breezes has been studied by means of analysis of meteorological and chemical data associated with a particular pollution attack. Observational evidence indicates that there are periodic vertical eddy motions associated with the discontinuity. Variations in air-pollution concentrations are thought to be due to the location, in space and time, of pollution-stagnation areas, modified by the intrusions of air from aloft.

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