Diffusion of re-suspended dust induced by vehicles: Full-scale simulation and field test

Re-suspended road dust refers to the dust settled on road surface that is stirred up again by vehicles, leading to road area air pollution. To better understand the diffusion patterns of these particles, this study simulated the diffusion using high-definition cameras to capture long-persistence luminescent material from a visual media perspective, field measurement using particle counters was carried out to validate the effectiveness. The key findings include: The suction between the tire and ground is crucial for re-suspending particles after rolling. The wake of the vehicle carries particles forward without lateral or vertical diffusion, but negative pressure be-hind the vehicle causes lateral and vertical diffusion. Higher speeds and ground deposit concentrations increase diffusion height and width. To protect pedestrians on overpass and roadside, sidewalks should be placed at a certain distance from road. This study aims to provide data for mitigating road dust re-suspension and aiding computational fluid dynamics simulations.