Évolution de la qualité de l’air en europe sur dix ans : première évaluation multimodèle

Abstract : In order to assess the efficiency of air quality mitigation measures, an investigation of the decadal evolution of air quality over Europe was performed in the framework of the European research project CityZen. Significant downward trends of anthropogenic emissions were reported over the past decade, and these efforts lead to a decrease of NO2 levels observed at background sites throughout Europe. On the contrary, the ozone trend is insignificant or increasing at most sites (as a result of less efficient NOx titration). To identify the factors influencing this trend, INERIS coordinated an ambitious decadal numerical experiment involving six modelling teams implementing a variety of state-of-the-art models. The models were found to capture well the decreasing trend of NO2 on average over Europe despite degraded performances in selected countries attributed to shortcomings in the emission inventories. A complementary experiment using constant emissions over the past decade demonstrated that the lack of significant ozone trend can be largely attributed to the large interannual variability that exceeds the trend that would be attributed to mitigation measures.
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Bertrand Bessagnet, Augustin Colette. Évolution de la qualité de l’air en europe sur dix ans : première évaluation multimodèle. Rapport Scientifique INERIS, 2012, 2011-2012, pp.47-49. ⟨ineris-01869422⟩

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