The study focuses on ultrafine particles (diameters less than 100 nm) emitted by diesel buses and assesses exposure to humans. The project examines particle inventory at the Woolloongabba busway station (Brisbane, Australia) over the winter months during which temperature inversions frequently occur. Since exhaust particles may be composed of toxic and carcinogenic substances it is the aim of this project to investigate the exposure to the waiting passengers. During the course of this study, a passenger census is conducted based on video surveillance, yielding person-by-person waiting time...