Research data supporting the publication "Deteriorating emissions of the current vehicle fleet are a major threat to air quality improvement"

1700 9 8238 2 48454 document 8238 Data_EDAR_Euro6s.xlsx application/vnd.openxmlformats-officedocument.spreadsheetml.sheet a6d855f7f8e9d98c8378d3ad9e16b9ba MD5 6606563 2026-07-15 14:42:58 http://edata.bham.ac.uk/1700/1/Data_EDAR_Euro6s.xlsx 1700 1 1 application/vnd.openxmlformats-officedocument.spreadsheetml.sheet spreadsheet public cc_by_4

Data_EDAR_Euro6s.xlsx

data archive 504 disk0/00/00/17/00 2026-07-15 14:47:34 2026-07-15 14:56:52 2026-07-15 14:47:34 data_collection show Ghaffarpasand Omid o.ghaffarpasand@bham.ac.uk 0000-0002-4111-339X Research data supporting the publication "Deteriorating emissions of the current vehicle fleet are a major threat to air quality improvement" 10col_life Emissions; Vehicle ageing; Euro 6, Euro 7; Remote sensing; Air pollution. Air quality improvements are threatened by the real-world emissions performance of in-use road vehicles. This study examines the impact of ageing on real-world emissions of cars and vans, subset by Euro 6 subclasses and fuel type (petrol and diesel), using over 90,000 real-world measurements of NO, NO2, NOx, CO, PM, and HC pollutants via remote sensing technology. Across the full Euro 6 fleet, disaggregated by vehicle and fuel type, consistent real-world ageing trends are observed, including increasing NO, NOx, and PM emissions for all vehicle types, pronounced NO2 increases in diesel vehicles, and divergent behaviour in CO and HC emissions between petrol and diesel vehicles. Analysis of covariance identifies vehicle age as the primary factor influencing emissions (η2 = 0.29–0.34, p < 0.0001), outweighing the effects of Euro subclass or engine capacity. Petrol cars exhibit relatively stable emissions performance over time, while diesel vans show steeper degradation in NOx and PM emissions compared to diesel cars. The similarity of deterioration slopes across Euro 6 subclasses, despite progressive tightening of test protocols, raises concern about the effectiveness of current emission durability requirements. These findings have direct implications for the design of in-service conformity measures and emissions-based access policies such as Low Emission Zones and underscore the need for enhanced durability monitoring under Euro 7. 2026-07-14 published University of Birmingham https://doi.org/10.25500/edata.bham.00001700 Dataset research-data@contacts.bham.ac.uk School of Geography, Earth and Environmental Sciences nerc NE/S003487/1 yes yes yes TRUE