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HDVs conforming to Euro IV and V standards frequently show poor real-world NOx emissions performance. Evidence indicates that new certification protocols in Euro VI resolve this problem, and Euro VI-compliant HDV NOx emissions meet expectations.
Documents the discrepancy between type-approval and real-world NOx emissions from new diesel passenger cars. On average, on-road NOx emissions from the vehicles tested for this analysis were about seven times higher than the limits set by the Euro 6 standard.
Results of a project by the Center for Alternative Fuels, Engines and Emissions at West Virginia University to conduct in-use testing of three vehicles, using a portable emissions measurement system, over a variety of test routes.
Beijing's new local standards to prevent excess NOx emissions from HDVs operating at low-speed in urban conditions make the city the first region in the world to address this deficiency in the Euro IV and V standards.
Analyzes the causes of high off-cycle NOx emissions from Euro IV/V heavy vehicles that threaten efforts to improve urban ambient air quality in Europe and in other countries that use the Euro regulation as a pattern, and recommends various measures to address the problem.