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On Diesel engines specifically, what features, parts, components, etc. makes it Euro 2, 4, 5, or 6 compliant? For example, if a Diesel engine with just an EGR, but without a DPF,
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ICCT: real-world NOx from Euro 6 diesel passenger cars more than 2x Euro VI diesel trucks - Green Car Congress
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NOx control technologies for Euro 6 diesel passenger cars - International Council on Clean Transportation
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Particulate emissions from diesel engines: correlation between engine technology and emissions | Journal of Occupational Medicine and Toxicology | Full Text
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Energies | Free Full-Text | Environmental Analysis of Petrol, Diesel and Electric Passenger Cars in a Belgian Urban Setting | HTML
Estimated share of conventional, open loop, Euro 1, Euro 2 and Euro 3 gasoline and diesel passenger cars and light-duty vehicles in the EU15 in 1990 and 2005 — European Environment Agency
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