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The Strategic Workplan for Particulate Matter: 2000-2004 summarizes the state of knowledge of highway related research into Particulate Matter (PM) pollution as determined from previous research efforts and identifies initiatives to fill gaps in knowledge of PM. In an effort to coordinate future research efforts to answer many of the unknown questions about PM emissions, FHWA undertook a project to define the transportation community's needs for future research with the goal of establishing a plan for future research studies that would define the relationship and contribution of PM emissions from highway vehicles. The work was undertaken because of the increasing concern that PM has on human health and the environment and the need to reduce emissions of PM from vehicles. It examines several areas that are considered essential in understanding the transportation community's contribution to particulate (PM) emissions. The report examines future research needs by investigating four uncertainties in the current knowledge of PM including likely nonattainment areas for PM(sub 10) and PM(sub 2.5) pollution, whether PM is a regionally or locally produced pollutant, what the transportation contribution is to the total emissions from all sources, and then the most effective control strategies for reducing PM emissions. These four uncertainties are then used to define five focus areas which the research projects can be grouped, including monitoring, chemical characterization of PM, sources, analysis and modeling, and control strategies. The focus areas are then further refined into fourteen individual projects which are outlined as the projects that should be initiated to understand the transportation contribution to PM pollution.