NOX emissions from heavy-duty and light-duty diesel vehicles in the EU: Comparison of real-world performance and current type-approval requirements

This briefing paper identifies key differences in the regulations governing certification of NOX emissions from diesel cars (Euro 6) and trucks (Euro VI) that help explain
differences in their real-world emissions performance. Ultimately, an examination of the heavy-duty vehicle regulation reveals insights that could be used to improve the light-duty vehicle regulation.