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Contribution of atmospheric dry deposition to stormwater loads for PAHs and trace metals in a small and highly trafficked urban road catchment

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Abstract

A deep understanding of pollutant buildup and wash-off is essential for accurate urban stormwater quality modeling and for the development of stormwater management practices, knowing the potential adverse impacts of runoff pollution on receiving waters. In the context of quantifying the contribution of airborne pollutants to the contamination of stormwater runoff and assessing the need of developing an integrated AIR-WATER modeling chain, loads of polycyclic aromatic hydrocarbons (PAHs) and metal trace elements (MTEs) are calculated in atmospheric dry deposits, stormwater runoff, and surface dust stock within a small yet highly trafficked urban road catchment (~ 30,000 vehicles per day) near Paris. Despite the important traffic load and according to the current definition of “atmospheric” source, atmospheric deposition did not account for more than 10% of the PAHs and trace metal loads in stormwater samples for the majority of the events, based on the ratio of deposition to stormwater. This result shows that atmospheric deposition is not a major source of pollutants in stormwater, and thus, linking the air and water compartment in a modeling chain to have more accurate estimates of pollutant loads in stormwater runoff might not be relevant. Comparison of road dust with water samples demonstrates that only the fine fraction of the available stock is eroded during a rainfall event. Even if the atmosphere mostly generates fine particles, the existence of other sources of fine particles to stormwater runoff is highlighted.

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Acknowledgements

The authors would like to thank Frédéric Mahé, Fabrice Dugay, and Christophe Debert from Airparif for their precious informations.

Funding

The authors would like to thank the ANR-12-VBDU-0002 TRAFIPOLLU project which funded this study. The authors would also like to thank OPUR research program and Al AZM association (Lebanon) for financing the research work of Ph.D. student Saja AL ALI.

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Correspondence to Saja Al Ali.

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Responsible editor: Philippe Garrigues

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Al Ali, S., Debade, X., Chebbo, G. et al. Contribution of atmospheric dry deposition to stormwater loads for PAHs and trace metals in a small and highly trafficked urban road catchment. Environ Sci Pollut Res 24, 26497–26512 (2017). https://doi.org/10.1007/s11356-017-0238-1

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  • DOI: https://doi.org/10.1007/s11356-017-0238-1

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