Wet Dust Sampler: a Sampling Method for Road Dust Quantification and Analyses

Publisher's full text

In northern countries, the climate, and consequently the use of studded tyres and winter traction sanding, causes accumulation of road dust over winter and spring, resulting in high PM10 concentrations during springtime dusting events. To quantify the dust at the road surface, a method—the wet dust sampler (WDS)—was developed allowing repeatable sampling also under wet and snowy conditions. The principle of operation is flushing high-pressurised water over a defined surface area and transferring the dust laden water into a container for further analyses. The WDS has been used for some time and is presented in detail to the international scientific community as reported by Jonsson et al. (2008) and Gustafsson et al. (2019), and in this paper, the latest version is presented together with an evaluation of its performance. To evaluate the WDS, the ejected water amount was measured, as well as water losses in different parts of the sampling system, together with indicative dust measurement using turbidity as a proxy for dust concentration. The results show that the WDS, when accounting for all losses, have a predictable and repeatable water performance, with no impact on performance based on the variety of asphalt surface types included in this study, given undamaged surfaces. The largest loss was found to be water retained on the surface, and the dust measurements imply that this might not have as large impact on the sampled dust as could be expected. A theoretical particle mass balance shows small particle losses, while field measurements show higher losses. Several tests are suggested to validate and improve on the mass balances. Finally, the WDS is found to perform well and is able to contribute to further knowledge regarding road dust implications for air pollution.



Electric Road Systems Conference (ERSC2020)

Welcome to the 4th Electric Road Systems Conference (ERSC2020), 12–13 May 2020 in Lund, Sweden

Via Nordica 2020

VTI participates at Via Nordica 2020 in Malmö 10–12 June 2020. The congress is organised by the Nordic Road Association (NVF).

ICTTP 2020

ICTTP, International Conference on Traffic and Transport Psychology, is held in Gothenburg, Sweden.



VTI part of Swedish-Indian collaboration for increased traffic safety

More than 150,000 traffic-related fatalities occur annually in India. Cooperation between Swedish and Indian companies and institutions is now being formed to greatly reduce these. The lessons learned will be utilized for development needs in different parts...


Cherish the support for congestion charges

The introduction of a congestion charge in Stockholm had the intended effect of reducing congestion - even long term.  And after the introduction of the charges the public support steadily increased. This success story has attracted extensive interest from...


The Pedestrian Perspective in new projects

Two projects focusing on safety for pedestrians have recently commenced at VTI: Smart Urban Traffic Zones and Safety for Pedestrians. There are links to the ongoing EU project VIRTUAL – for which Research Director Astrid Linder is the coordinator.


Improved lighting for pedestrians and cyclists

Together with Lund University, researchers from VTI will study how outdoor lighting can improve the quality of walking and cycling trips at dusk and darkness.


VTI and SAFER are organising the world’s largest traffic and transport psychology conference in Gothenburg

In August 2020, VTI and SAFER are organising the International Conference on Traffic and Transport Psychology (ICTTP) in Gothenburg. ICTTP is held every four years, and this year is the seventh conference.


Kilometre tax is expected to have the greatest environmental impact

How can environmentally differentiated charges and other policy instruments reduce the freight transports' environmental impact? VTI has participated in a research project on this subject.