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  • 1.
    Johansson Thunqvist, Eva-Lotta
    et al.
    KTH, School of Technology and Health (STH), Centres, Centre for Health and Building, CHB.
    Blomqvist, Göran
    Factors regulating the air-borne spreading of pollutants from roads1998In: The Xth International PIARC Winter Road Congress, London: PTRC Education and Research Services Ltd , 1998, p. 459-468Conference paper (Refereed)
    Abstract [en]

    Pollutants from roads are spread by mechanisms such as splash, spray and ploughing. In this study, the spreading was studied at two locations where information on the local weather was available and the amount of salt applied on the road could be obtained. When comparing the deposition of Na, Ca, K and Mg, the road-related gradient is obvious; the increase of sodium in the containers closest to the road is sometimes more than 1000-fold, and the increase of the other cations 10 - 100 fold. Also during a period of no de-icing the deposition of cations is higher towards the road. The deposition of Na is related to the amount of road salt applied, and also to wind and type and amount of precipitation. The increase of other cations could be an effect of weathering and/or ion-exchange on the fresh surfaces of the road.

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