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Discussion papers
https://doi.org/10.5194/acp-2018-973
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/acp-2018-973
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.

Research article 26 Oct 2018

Research article | 26 Oct 2018

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

The impact of measures to reduce road dust, evaluated for a street canyon in Helsinki

Ana Stojiljkovic1, Mari Kauhaniemi2, Jaakko Kukkonen2, Kaarle Kupiainen1, Ari Karppinen2, Bruce Rolstad Denby3, Anu Kousa4, Jarkko V. Niemi4, and Matthias Ketzel5 Ana Stojiljkovic et al.
  • 1Finnish Environment Institute (SYKE), Helsinki, P.O.Box 140, FI-00251, Helsinki, Finland
  • 2Finnish Meteorological Institute, Helsinki, P.O. Box 503, FI-00101, Helsinki
  • 3Norwegian Meteorological Institute, P.O. Box 43, Blindern, NO-0313 Oslo, Norway
  • 4Helsinki Region Environmental Services Authority, P.O.Box 100, FI-00066, Helsinki, Finland
  • 5Department of Environmental Science, Aarhus University, P.O. Box 358, DK-4000, Roskilde, Denmark

Abstract. We have evaluated numerically how effective a few selected measures would be for reducing road dust. The selected measures included the reduction of the use of studded tyres in light-duty vehicles and phasing-out of salt or sand in traction control. We have evaluated these measures for a street canyon location in central Helsinki, for four years (2007–2009 and 2014). Air quality measurements were conducted in the street canyon for two years, 2009 and 2014. Two road dust emission models, NORTRIP and FORE, were applied in combination with the street canyon dispersion model OSPM to compute the street increments of PM10 within the street canyon. The predicted concentrations were compared with the air quality measurements. Both models reproduced the seasonal variability of the PM10 concentrations but under-predicted the yearly mean values. It was found that the largest reductions of concentrations could potentially be achieved by reducing the fraction of vehicles that use studded tyres. For instance, a 30% percent decrease in the number of vehicles using studded tyres would result in an average decrease of the non-exhaust increment of PM10 from 10 to 22%, depending on the model used and the year considered. The corresponding decrease after removal of sanding and salting would be from 4% and 20% and from 0.1% to 4%, respectively. The results can be used for finding optimal strategies for reducing the high springtime particulate matter concentrations originated from road dust.

Ana Stojiljkovic et al.
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Ana Stojiljkovic et al.
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Short summary
Nordic countries experience deterioration of air quality in springtime due to high PM10 concentrations. Non-exhaust emissions from vehicular traffic are regarded as the most significant source of particulate air pollution during this part of the year. The results from this study demonstrate that changes in the winter tyre types as well as the adjustments of the road maintenance could substantially reduce the non-exhaust emissions.
Nordic countries experience deterioration of air quality in springtime due to high PM10...
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