Abstract
An elementary theoretical model of ground level concentrations of pollutants emitted by a tall chimney which is also a large heat source has been constructed by exploiting two key features of buoyant plume behavior. For moderate to strong winds with low turbulence level the model makes use of the 2 3 power law describing mean plume path. For the case of light to moderate winds and high turbulence intensity (such as occur under convective conditions) a plume “breakup” model is recommended. The consequences of these models are presented in a few diagrams in an appropriate nondimensional form. A comparison with observed ground level concentrations published by Moore (1969) and others show that the model successfully predicts these under neutral and unstable conditions. In particular, the model explains why in continental climates convective conditions with light to moderate winds may be critical for ground level pollution.
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