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Two Euro 4 light-duty diesel vehicles were retrofitted with Diesel Particulate Filters (DPF). One was retrofitted with a low efficiency flow-through DPF. And, the other was retrofitted with a high efficiency wall-flow DPF. PM emissions from both vehicles were evaluated under the new European drive cycle (NEDC) on a chassis dynamometer. Several instruments were used to measure particulate matter (PM) emissions simultaneously from different aspects for two retrofitted vehicles. The PM mass emission from the vehicle retrofitted with the low efficiency DPF is close to 5.0 mg/km Euro 5 mass emission standard. However, the solid particle number emission is about 30 times higher than the Euro 5 solid particle number emission standard. Mass and number emissions from the vehicle retrofitted with the high efficiency DPF are well below Euro 5 emission standards.