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Emissions of particulate matter associated with the use of light-duty vehicles is an increasingly important topic, with more and more political attention focused on this issue. Such discussions have tended to be dominated by direct injection Diesel engines, but now that all such engines feature DPFs, other engine types operating on other fuels are also of great interest. This presentation briefly reviews the causes of particle formation and considers the impact of the engine operating point of particle emissions and particle characteristics. Aftertreatment solutions are examined and the impact of changing test procedures in considered in order to offer some comments on what the next few years might hold for this area.