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Upcoming EU5 and expected emissions legislation BS5 in India in combination with efforts to optimize the overall fuel economy has created new challenges in the development of aftertreatment systems for passenger cars equipped with diesel engines. Since EU5 and BS5 emissions legislation will strongly be focused on the reduction of particulate matter it is likely that all vehicle applications will need aftertreatment systems with diesel particulate filters. High filtration efficiency combined with a high resistance to thermo-mechanical stress is a strong requirement for diesel particulate filters to meet EU5 and BS5 emission legislation. Besides those requirements the backpressure of particulate filters has to be considered since backpressure is also related to fuel economy and therefore CO₂ emissions.