This report focuses on the development of an exposure management strategy for diesel particulate matter (DPM) in CPB contractors, covering occupational assessment, toxicology, and hygiene standard setting. It discusses the sources and routes of occupational exposure, the appropriate approach to undertake exposure assessments, and the toxicology of DPM, including absorption, distribution, pathways for biotransformation, mechanisms of harm, and pathways of elimination. The report also covers hygiene standard setting, including the threshold of harm for DPM and occupational exposure limits (OEL).