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Particulates in Diesel Exhaust Gas have become a major concern of Environment Protection Agencies in the recent years. The main focus was placed on the so called Nano Particles which are the most harmful to human beeings. OEMs for car, light and heavy commercial vehicle industries have been working on different technologies for a number of years to meet the stringent emission legislations. At the same time some countries have started schemes to retrofit older vehicles that are still on the road and greatly contribute to air pollution. The government of Korea took the worldwide lead and defined 3 categories of required PM reduction rates and incentives to LDV and HDV owners who are prepared to retrofit their vehicles.