Abstract
Steady state mean concentrations of a tracer gas were measured in a 300:1 scale model of an idealized city with variable geometry placed within a wind tunnel at various orientations to the same mean flow (free stream velocity of 1.5 m/s). The tracer gas, ethane, was released from two or four paralle line sources to simulate traffic at an urban intersection to quantify the pollution at street level. It was shown that 1) Surface concentrations are greatest for ambient winds parallel to the street (0=0°) and lowest for the wind direction 0=45°. 2) Large buildings may cause low concentrations in their immediate vicinities because of the intensification of winds they generate. Such large buildings may cause relatively high concentrations in the surrounding areas because of stagnation which occurs uo-wind and down-wind of them.
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