Séminaire IGE

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Modern road transport is still an important source of primary and secondary particles

Reporté

vendredi 31 mars 2023 - 13h30

Barbara d'Anna - Aix-Marseille Université
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Many urban areas in Europe suffer from poor air quality, which results in increased morbidity and mortality rates among the urban population. Air pollutants arise from a variety of sources, among them, vehicle emissions represent about 52% of total nitrogen oxides (NOx), 38% of CO2, and 40% of black carbon (BC) in France. Legislative authorities have imposed stringent emission limits and car manufacturers have responded to emission regulations by introducing a series after treatment technologies. These advances highly contributed to the improved urban air quality but road transport impact on air pollution is more complex. Secondary pollutants from road transport are still important and are derived from atmospheric transformations giving rise to secondary organic and inorganic aerosols (SOA-SIA and ozone). We have recently conducted several studies on emission measurements on Euro5 and Euro6 vehicles. Emissions from diesel vehicles were characterized by high NOx and low particle number. On the contrary, gasoline vehicles emitted low quantities of NOx, but very high quantities of particles and VOCs. Gasoline vehicles generated impressive secondary aerosol mass upon photochemical aging (SOA and SIA) compared to the diesel vehicles. High secondary particle formation is manly due monoaromatic compounds and ammonia present in the gasoline exhaust. We investigated both partitioning properties and chemical composition at molecular level of the formed SOA. We assessed the genotoxicity of these particles and the impact of recent aftertreatment technologies on local air quality using a street-level model.

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Equipe organisatrice : Organisation labo

Salle Lliboutry, IGE Glaciologie, 38400 Saint Martin d'Hères

Informations de visio :

Barbara d’Anna