Preprints
https://doi.org/10.5194/acp-2021-77
https://doi.org/10.5194/acp-2021-77

  26 Feb 2021

26 Feb 2021

Review status: this preprint is currently under review for the journal ACP.

Source apportionment of atmospheric PM10 Oxidative Potential: synthesis of 15 year-round urban datasets in France

Samuël Weber1, Gaëlle Uzu1, Olivier Favez2,3, Lucille Joanna Borlaza1, Aude Calas1, Dalia Salameh1, Florie Chevrier1,4,8, Julie Allard1, Jean-Luc Besombes4, Alexandre Albinet2,3, Sabrina Pontet5, Boualem Mesbah6, Grégory Gille6, Shouwen Zhang7, Cyril Pallares9, Eva Leoz-Garziandia2,3, and Jean-Luc Jaffrezo1 Samuël Weber et al.
  • 1Univ. Grenoble Alpes, CNRS, IRD, IGE (UMR 5001), 38000 Grenoble, France
  • 2INERIS, Parc Technologique Alata, BP 2, 60550 Verneuil-en-Halatte, France
  • 3Laboratoire Central de Surveillance de la Qualité de l’air, 60550 Verneuil-en-Halatte, France
  • 4Univ. Savoie Mont Blanc, CNRS, EDYTEM, 73000 Chambéry, France
  • 5Atmo Auvergne-Rhône-Alpes, 69500 Bron, France
  • 6Atmo Sud, 13294 Marseille, France
  • 7Atmo Hauts de France, 59044 Lille, France
  • 8Atmo Nouvelle Aquitaine, 33692 Mérignac, France
  • 9Atmo Grand Est, 67300 Schiltigheim, France

Abstract. Reactive oxygen species (ROS) carried or induced by particulate matter (PM) are suspected to induce oxidative stress in vivo, leading to adverse health impacts, such as respiratory or cardiovascular diseases. The oxidative potential (OP) of PM, displaying the ability of PM to oxidize the lung environment, is gaining a strong interest to examine health risks associated to PM exposure. In this study, OP was measured by two different acellular assays (dithiothreitol, DTT and ascorbic acid, AA) on PM10 filter samples from 15 yearly time series of filters collected at 14 different locations in France between 2013 and 2018, including urban, traffic and Alpine valley site typologies. A detailed chemical speciation was also performed on the same samples allowing the source-apportionment of PM using positive matrix factorization (PMF) for each series, for a total number of more than 1700 samples. This study provides then a large-scale synthesis on the source-apportionment of OP using coupled PMF and multiple linear regression (MLR) models. The primary road traffic, biomass burning, dust, MSA-rich, and primary biogenic sources had distinct positive redox-activity towards the OPDTT assay, whereas biomass burning and road traffic sources only display significant activity for the OPAA assay. The daily median source contribution to the total OPDTT highlighted the dominant influence of the primary road traffic source. Both the biomass burning and the road traffic sources contributed evenly to the observed OPAA. Therefore, it appears clearly that residential wood burning and road traffic are the two main target sources to prioritized in order to decrease significantly the OP in Western Europe and, would the OP being a good proxy of human health impact, to lower the health risks from PM exposure.

Samuël Weber et al.

Status: open (until 23 Apr 2021)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on acp-2021-77', Anonymous Referee #1, 22 Mar 2021 reply
  • RC2: 'Comment on acp-2021-77', Anonymous Referee #2, 25 Mar 2021 reply

Samuël Weber et al.

Samuël Weber et al.

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Short summary
Oxidative potential of aerosols is apportioned to the main PM sources found in 15 sites over France. The sources present clear distinct intrinsic OP's at a large geographic scale, and a drastic redistribution between the mass concentration and oxidative potential measured by both AA and DTT is highlighted. Moreover, the high discrepancy between the mean and median contribution of the sources to the given metrics rises some important questions when dealing with health endpoints.
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