Abstract
Atmospheric diffusion is accomplished by the wind movement of pollutants, but the character of the source of pollution requires that this action of the wind be taken into account in different ways. These sources can be grouped into three classes: point sources, line sources, and area sources. Both vertical and horizontal turbulent diffusion are described in detail. Atmospheric transport is discussed with emphasis on topographical barriers and semipermanent subsidence inversions. Air pollution meteorology is discussed in relation to urban air pollution. As more is learned about the meteorology of cities and the distribution of pollutant emissions, it may be possible to predict expected concentrations routinely and to take into account the changes in the patterns that would occur if the emissions were changed.
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