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Impacts and mitigation of excess diesel-related NO x emissions in 11 major vehicle markets
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Impacts and mitigation of excess diesel-related NO x emissions in 11 major vehicle markets
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Impacts and mitigation of excess diesel-related NO x emissions in 11 major vehicle markets
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Journal Article
Impacts and mitigation of excess diesel-related NO x emissions in 11 major vehicle markets
2017
Overview
Vehicle emissions contribute to fine particulate matter (PM
) and tropospheric ozone air pollution, affecting human health, crop yields and climate worldwide. On-road diesel vehicles produce approximately 20 per cent of global anthropogenic emissions of nitrogen oxides (NO
), which are key PM
and ozone precursors. Regulated NO
emission limits in leading markets have been progressively tightened, but current diesel vehicles emit far more NO
under real-world operating conditions than during laboratory certification testing. Here we show that across 11 markets, representing approximately 80 per cent of global diesel vehicle sales, nearly one-third of on-road heavy-duty diesel vehicle emissions and over half of on-road light-duty diesel vehicle emissions are in excess of certification limits. These excess emissions (totalling 4.6 million tons) are associated with about 38,000 PM
- and ozone-related premature deaths globally in 2015, including about 10 per cent of all ozone-related premature deaths in the 28 European Union member states. Heavy-duty vehicles are the dominant contributor to excess diesel NO
emissions and associated health impacts in almost all regions. Adopting and enforcing next-generation standards (more stringent than Euro 6/VI) could nearly eliminate real-world diesel-related NO
emissions in these markets, avoiding approximately 174,000 global PM
- and ozone-related premature deaths in 2040. Most of these benefits can be achieved by implementing Euro VI standards where they have not yet been adopted for heavy-duty vehicles.
