Abstract
Sulfur hexafluoride was used as a gaseous tracer in a quasi-instantaneous line source release by an automobile moving along an urban highway in Los Angeles. Concentrations at various locations from 0.4 to 3.2 km downwind of the highway were recorded at ground level as a function of time. The tracer data were used to test the validity of several theoretical models which can be used in predicting the dispersion from an instantaneous cross-wind line source. The model based upon the semi-empirical turbulent diffusion equation, using a power-law vertical velocity profile and a power-law vertical eddy diffusivity profile, was found to provide the best agreement with the data.
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