VERTICAL DISTRIBUTION OF METAL DEPOSITION RATES NEXT TO AudMAJOR URBAN ROAD IN BUDAPEST, HUNGARY

摘要

Dust and metal deposition are of important significance as an indicator of local air quality.udHowever, their vertical deposition characteristics at greater heights are not well known. Settling dustudsamples were collected at four heights and at both sides of a 40 meters high building next to a busy urbanudroad in Budapest, Hungary. In this study, concentrations and monthly deposition rates of nine elementsudare (Ba, Ca, Cr, Cu, Fe, Mn, Pb, Sr, Zn) evaluated. The study site can be characterized by average settlinguddust load showing a slight seasonal variation. Highest contamination was found for Cu, Pb and Zn. Theudsources of these metals could be the traffic and the weathering of materials of the built environment. Theudenrichment of these metals is generally the highest at the road-side of the building and at lower samplingudheights, but Pb and Zn may show strong enrichment even at 33 m and at the low-traffic side of theudbuilding. This is generally the highest in the dry and windy periods suggesting the dominance of the resuspensionudof urban soil and road dust in the metal deposition. The vertical dust and metal depositionudpatterns mostly correspond to the supposed air-flow model but just in case of highest chance of resuspensionuda special model is needed to clearly describe the deposition patterns. This is probably due toudthe simultaneous effect of weather conditions and the morphology of natural and built environment.