Articles | Volume 21, issue 5
Research article
17 Mar 2021
Research article |  | 17 Mar 2021

A comparison of long-term trends in observations and emission inventories of NOx

Elena Macdonald, Noelia Otero, and Tim Butler

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Cited articles

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Barrientos, M.: Population density, Europe, available at: (last access: 14 April 2020), 2019. a
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Beevers, S. D., Westmoreland, E., de Jong, M. C., Williams, M. L., and Carslaw, D. C.: Trends in NOx and NO2 emissions from road traffic in Great Britain, Atmos. Environ., 54, 107–116,, 2012. a, b, c, d, e, f, g
Bigazzi, A. Y. and Rouleau, M.: Can traffic management strategies improve urban air quality? A review of the evidence, J. Transp. Health, 7, 111–124,, 2017. a
Short summary
NO2 limit values are still regularly exceeded in many European cities despite decreasing emissions. Measurements of NOx concentrations from stations across Europe were systematically analysed to assess long-term changes observed in urban areas. We compared trends in concentration increments to trends in total and traffic emissions to find potential discrepancies. The results can help in evaluating inaccuracies in emission inventories and in improving spatial imbalances in data availability.
Final-revised paper