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Trends in diesel NOX emission factors and type approval emission standards

Figure Created 23 Nov 2012 Published 27 Nov 2012 Last modified 29 Nov 2012, 11:37 AM
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The figure shows the change in real-world NOx emission factors in urban conditions for diesel cars with different Euro standards along with the change in the type-approval standards

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care is needed when interpreting this figure. The NOx emissions limit for a Euro 2 diesel car is deduced as the limit was set for combined pollutants (HC + NOx) and the test procedure changed between Euro 2 and Euro 3. The trend of NOx emission factors is based on emission functions provided by COPERT 4 at speed 33.6 km/h.

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