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Effect of a motorcycle helmet on the airborne dust concentration near a rider’s nose and mouth: wind tunnel study and field test

Arabian Journal of Geosciences volume 9, Article number: 184 (2016) Cite this article

Abstract

Wind tunnel experiments were performed to investigate how the presence of a driver wearing a motorcycle helmet affects the airborne dust concentration near the driver’s nose and mouth relative to the ambient dust concentration. Data were collected for different grain size fractions of dust ranging from less than 20 μm to approximately 100 μm. The wind tunnel data were also applied to a field experiment with motorcycles and quads. Results show that the presence of a driver wearing a helmet significantly affects dust concentration. For the helmet tested, the concentration at the mouth position was about 50 % lower than the ambient concentration. At the nose position, the concentration depended on the particle size considered. For fine particles (smaller than approximately 30 μm), the dust concentrations at the nose position were lower than the ambient concentrations, similar to the situation near the mouth. For particles larger than 30 μm, which represent most dust released during typical off-road driving on natural surfaces, the dust concentration at the nose position was higher than the ambient concentration. The reason is most probably the chin guard of the helmet, which disturbs the trajectory of the dust particles and brings many particles to a higher elevation as they flow over the chin guard. Most helmets currently on the market have a chin guard and will behave similarly to the one tested in this study. Applying the wind tunnel results to the field experiment showed that the dust concentrations near the nose of the driver were more than 10 % higher than the ambient concentration, but only for particles coarser than 30 μm. For finer particles, they were lower, up to 70 % lower for particles smaller than 20 μm. On the other hand, the dust concentration near the mouth was significantly lower than the ambient concentration, less than half for all particle size classes investigated. This study shows that the effect of wearing a helmet should be taken into consideration when calculating human exposures to airborne dust.

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Acknowledgments

Thanks and appreciation to the research team that helped with the field experiments: Deborah Keil, Yuanxin Teng, Jamie DeWitt, Jim Pollard, Winnie David, Rebecca Chow, Sharon Young, and Curtis Coulter. Thanks also to Paul Solomon for his advice on the project. This project was funded by a grant awarded to BB from the Bureau of Land Management (URL: http://www.blm.gov/nv/st/en/fo/lvfo.html), grant number: L11AC20058. The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript. The views and conclusions contained in this document are those of the authors and should not be interpreted as representing the opinions or policies of the US government. Mention of trade names or commercial products does not constitute their endorsement by the US government.

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Authors and Affiliations

  1. Geography Research Group, Department of Earth and Environmental Sciences, Katholieke Universiteit Leuven, Geo-Institute, Celestijnenlaan 200E, 3001, Heverlee, Belgium

    Dirk Goossens

  2. Department of Geoscience, University of Nevada Las Vegas, 4505 S. Maryland Parkway, Las Vegas, NV, 89154-4010, USA

    Brenda Buck

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  1. Dirk Goossens
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  2. Brenda Buck
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Correspondence to Dirk Goossens.

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This article is part of the Topical Collection on DUST

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Goossens, D., Buck, B. Effect of a motorcycle helmet on the airborne dust concentration near a rider’s nose and mouth: wind tunnel study and field test. Arab J Geosci 9, 184 (2016). https://doi.org/10.1007/s12517-015-2181-0

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  • DOI: https://doi.org/10.1007/s12517-015-2181-0

Keywords

  • Dust
  • Helmet
  • Motorcycle
  • Quad
  • Wind tunnel

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