Figure 3.2: The effect of thermal and mechanical turbulence combining to produce a well-mixed zone of contaminants

Text description of figure

Figure 3.2 shows three situations. In the top picture, emissions from a car are dispersed behind and upwards being influenced only by thermal turbulence. In the middle picture, wind turbulence and mechanical turbulence from a following car also interact with the front vehicle emissions. The bottom picture shows how the above combine to create a well mixed zone of contaminants in the plume behind a vehicle.