Micropollutant screening of road and parking runoff in Paris conurbation

Within the frame of the ROULÉPUR research project, road and parking runoff from four sites (Paris, Compans, Rosny-sous-Bois and Villeneuve-le-Roi) with contrasted trafic levels, all situated in Paris conurbation, have been studied for a very broad spectrum of molecules. A total of 128 micropollutants were monitored, including metallic (n = 41) and organic (n = 87) pollutants. Both dissolved and particulate phases were considered. With the exception of a few molecules which have not been detected, a large majority of the pollutants sought have been detected in runoff, with concentrations ranging from a few ng/l for the least concentrated pollutants such as brominated flame retardants (PBDE, HBCDD, TBBPA) to several tens of µg/l for certain metallic elements. Overall, the contamination profiles are quite similar between the sites; the differences between sites being most often on the levels of concentration. Despite a high inter-event variability on each site, it is observed, for many micropollutants, that the sites with the highest traffic densities (Paris and Compans) have the highest concentrations compared to the other two sites. The Villeneuve-le-Roi site appears for many substances as the least contaminated. Finally, the Rosny-sous-Bois site in most cases has intermediate concentration levels. This trend is clear for metallic elements, total hydrocarbons, PAHs, alkylphenols (APs) and BPA and to lesser extent for PBDE. For perfluoroalkylated compounds, the Rosny-sous-Bois site stands out from other sites with very high point concentrations, but also very different profiles. For a majority of pollutants, similar concentration levels are observed between suspended matter and sediment. More information can be found in the following paper: Gasperi, J.; Le Roux, J.; Deshayes, S.; Ayrault, S.; Bordier, L.; Boudahmane, L.; Budzinski, H.; Caupos, E.; Caubriere, N.; Flanagan, K.; et al. Micropollutants in Urban Runoff from Traffic Areas: Target and Non-Target Screening on Four Contrasted Sites. Water 2022, 14, 394. https://doi.org/10.3390/w14030394