Preprints
https://doi.org/10.5194/acp-2021-839
https://doi.org/10.5194/acp-2021-839

  29 Nov 2021

29 Nov 2021

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

9-year trends of PM10 sources and oxidative potential in a rural background site in France

Lucille Joanna Borlaza1, Samuël Weber1, Anouk Marsal1, Gaëlle Uzu1, Véronique Jacob1, Jean-Luc Besombes2, Mélodie Chatain3, Sébastien Conil4, and Jean-Luc Jaffrezo1 Lucille Joanna Borlaza et al.
  • 1University Grenoble Alpes, CNRS, IRD, INP-G, IGE (UMR 5001), 38000 Grenoble, France
  • 2Université Savoie Mont-Blanc, CNRS, EDYTEM (UMR5204), 73000 Chambéry, France
  • 3Atmo Grand Est, 67300 Schiltigheim, France
  • 4ANDRA, DRD/GES Observatoire Pérenne de l’Environnement, 55290 Bure, France

Abstract. Long-term monitoring at sites with relatively low particulate pollution could provide an opportunity to identify changes in pollutant concentration and potential effects of current air quality policies. In this study, a 9-year sampling of PM10 (particles with an aerodynamic diameter below 10 µm) was performed in a rural background site in France from February 28, 2012 to December 22, 2020. The Positive Matrix Factorization (PMF) method was used to apportion sources of PM10 based on quantified chemical constituents and specific chemical tracers from collected filters. Oxidative potential (OP), an emerging health-metric that measures PM capability to potentially cause anti-oxidant imbalance in the lung, was also measured using two acellular assays: dithiothreitol (DTT) and ascorbic acid (AA). The contribution of PMF-resolved sources to OP were also estimated using multiple linear regression (MLR) analysis. In terms of mass contribution, the dominant sources are secondary aerosols (nitrate- and sulphate-rich), associated with long-range transport (LRT). However, in terms of OP contributions, the main drivers are traffic, mineral dust, and biomass burning factors. There is also some OP contribution apportioned to the sulphate- and nitrate-rich sources influenced by processes and aging during LRT that could have encouraged mixing with other anthropogenic sources. The study indicates much lower OP values than in urban areas. A substantial decrease (58 % reduction from year 2012 to 2020) in the mass contributions from the traffic factor was found, however, this is not clearly reflected in its OP contribution. Nevertheless, the findings in this long-term study in the OPE site could signal effectiveness of implemented emission control policies, as also seen in other long-term studies conducted in Europe, mainly for urban areas.

Lucille Joanna Borlaza et al.

Status: final response (author comments only)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on acp-2021-839', Anonymous Referee #1, 30 Nov 2021
  • RC2: 'Comment on acp-2021-839', Anonymous Referee #3, 08 Dec 2021
  • RC3: 'Comment on acp-2021-839', Anonymous Referee #2, 24 Dec 2021

Lucille Joanna Borlaza et al.

Lucille Joanna Borlaza et al.

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Short summary
A 9-year dataset of the chemical and oxidative potential (OP) of PM10 at a rural background site was investigated. An extensive source apportionment led to identifying differences in source impacts between mass and OP underlining the importance of PM redox activity when considering health effects. The influence of mixing and aging processes were also tackled. Traffic contributions have decreased over the years for this site attributed to regulations limiting vehicular emissions in bigger cities.
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