NOx Emissions from Diesel Passenger Cars Worsen with Age

Yuche Chen, Jens Borken-Kleefeld

Research output: Contribution to journalArticlepeer-review

73 Scopus Citations

Abstract

Commonly, the NOx emissions rates of diesel vehicles have been assumed to remain stable over the vehicle's lifetime. However, there have been hardly any representative long-term emission measurements. Here we present real-driving emissions of diesel cars and light commercial vehicles sampled on-road over 15 years in Zurich/Switzerland. Results suggest deterioration of NOx unit emissions for Euro 2 and Euro 3 diesel technologies, while Euro 1 and Euro 4 technologies seem to be stable. We can exclude a significant influence of high-emitting vehicles. NOx emissions from all cars and light commercial vehicles in European emission inventories increase by 5-10% accounting for the observed deterioration, depending on the country and its share of diesel cars. We suggest monitoring the stability of emission controls particularly for high-mileage light commercial as well as heavy-duty vehicles.
Original languageAmerican English
Pages (from-to)3327-3332
Number of pages6
JournalEnvironmental Science and Technology
Volume50
Issue number7
DOIs
StatePublished - 2016

NREL Publication Number

  • NREL/JA-5400-66153

Keywords

  • diesel cars
  • light commercial vehicles
  • NOx
  • real-driving emissions

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