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Discussion papers
https://doi.org/10.5194/acp-2018-816
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/acp-2018-816
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.

Research article 01 Oct 2018

Research article | 01 Oct 2018

Review status
This discussion paper is a preprint. It is a manuscript under review for the journal Atmospheric Chemistry and Physics (ACP).

Identification and quantification of particulate tracers of exhaust and non-exhaust vehicle emissions

Aurélie Charron1,2, Lucie Polo-Rehn1,2, Jean-Luc Besombes3, Benjamin Golly3, Christine Buisson4, Hervé Chanut5, Nicolas Marchand6, Géraldine Guillaud5, and Jean-Luc Jaffrezo1 Aurélie Charron et al.
  • 1Univ. Grenoble Alpes, CNRS, IRD, IGE (UMR 5001), 38000 Grenoble, France
  • 2IFSTTAR, 69675 Bron, France
  • 3LCME, Univ. Savoie Mont-Blanc, LCME, 73000 Chambéry, France
  • 4LICIT, ENTPE, IFSTTAR, 69518 Vaux en Velin, France
  • 5Atmo Auvergne-Rhône-Alpes, 69500 Bron, France
  • 6Aix Marseille Univ., CNRS, LCE, 13331 Marseille, France

Abstract. In order to identify and quantify key-species associated with non-exhaust emissions and exhaust vehicular emissions a large comprehensive dataset of particulate species has been obtained thanks to simultaneous near-road and urban background measurements coupled with detailed traffic counts and chassis dynamometer measurements of exhaust emissions of a few in-use vehicles well-represented in the French fleet. Elemental Carbon, brake-wear metals (Cu, Fe, Sb, Sn, Mn), n-alkanes (C19–C26), light molecular weight PAHs (Pyrene, Fluoranthene, Anthracene) and two hopanes (17α21βNorhopane and 17α21βhopane) are strongly associated with the road traffic. Traffic-fleet emission factors have been determined for all of them and are consistent with most recent published equivalent data. When possible, light-duty and heavy-duty duty traffic emission factors are also determined. Most of the first ones are in good agreement with emissions from chassis dynamometer measurements in absence of significant non-combustion emissions. This study has shown that ratios involving copper (mainly Cu/Fe and Cu/Sn) could be used to trace brake-wear emissions as they seem to be roughly constant in Europe and as longer as Cu-free brake are not largely spread. In France where the traffic was largely dominated by diesel vehicles in 2011 (70%), the OC/EC ratio typical of traffic emissions was around 0.44. On the contrary, the use of quantitative data for source apportionment studies is not straightforward for the identified organic molecular markers; while, their presence seems to well-characterized fresh traffic emissions.

Aurélie Charron et al.
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Short summary
This research quantified particulate species that could be used to trace non-exhaust and exhaust traffic emissions. Results showed the important contribution of heavy metals from brake wear to total particulate traffic emissions. In France the traffic largely dominated by diesel vehicles led to important emissions of elemental carbon, as well as significant emissions of low molecular weight polycyclic aromatic compounds.
This research quantified particulate species that could be used to trace non-exhaust and exhaust...
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