Field measurement to assess the correlation between wind ventilation performance of and wind structure inside a street with an elevated structure in Bangkok, Thailand

To reduce the health risk to pedestrians, urban ventilation has becomes increasingly important to reduce the concentrations of car exhaust emissions. In this study, the ventilation performance of a street in Bangkok, Thailand, was investigated by performing measurements therein. As a result, the influence of elevated structures was shown. It was also observed that the density of exhaust gas is a simple function of the wind speed and traffic volume when the wind is blowing parallel to the street. However, the ventilation efficiency varied drastically depending on the angle between the street and the wind direction when the wind direction was not stable.