Topics / In-use NOx emissions

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The modifications required by US regulators to VW diesel engines designed to cheat emissions tests are more stringent and more effective than in Europe.

In September, China’s Ministry of Environmental Protection issued the first national standard for portable emission measurement system (PEMS) testing of heavy-duty vehicles (HDVs). This regulation is a supplement to all existing requirements under the China V standard, and it requires additional on-road PEMS testing for new and in-use China V HDVs.

Compares official laboratory-test and on-road nitrogen oxide (NOx) emissions for 541 Euro 5 and Euro 6 diesel passenger cars, representing 145 of the most popular European models.

2015.11.23

Analyzes and compares new-vehicle type-approval procedures in the EU and U.S. with an eye toward demonstrating how best to align regulatory requirements, customer expectations, and environmental performance.

Publication: White paper
2015.10.01

Proposes a rapid, comprehensive policy response not only to deal with defeat devices but also to identify vehicle models with high real-world emissions relative to test-cycle performance and improve current compliance and enforcement programs.

Publication: Briefing
2015.09.28
The Portuguese version of this blog was developed by Instituto de Energia e Meio Ambiente (IEMA).
Blog Post
2015.09.28
The new head of Secretariat of the Environment and Natural Resources (SEMARNAT), Rafeal Pacchiano Alamán, has announced that Mexico will undertake a real-world, in-use
Blog Post
2015.09.03

Analyzes results of emissions tests on 32 Euro 6 diesel passenger cars from 10 different manufacturers. Results show some automakers meeting diesel NOx emissions standards under more realistic driving conditions, while others lag badly.

Publication: White paper
2015.03.05

Details options for and benefits of leapfrogging the Euro 5/V LDV/HDV vehicle emissions standards, and instead progressing directly from Euro 4/V to Euro 6/VI.

Publication: Briefing
2015.03.02

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.

Publication: Briefing
2014.10.11

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.

Publication: White paper

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