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Roadside dusts were studied to explain the spatial variation,and presents level of pollution elements including Pt,Pd and Ir in Budapest and Seoul.Road dust samples were obtained two times from traffic focal points in Budapests bridges,Margitsziget,main roads and Budapests agglomeration to control sites.Similarly,the samples were collected from 6 sites of high traffic volumes in Seoul metropolitan city and from 2 control sites within the suburbs of Seoul,for comparison.The samples were analysed for contaminant elements by ICP-AES and for Pt,Pd and Ir by ICP-MS.Level of contaminant elements in road dusts from Budapest were in the range of 67.6 g kg-1 and 0.6 ?g kg-1; in Budapest suburbs 50.2 g kg-1 and 0.5 ?g kg-1; and Seoul 43.5 g kg-1 and 3.3 ?g kg-1.Geo-Accumulation Index(GAI)of the contaminant elements from Budapest,Budapest suburb and Seoul were 3.88 and-0.03; 2.74 and-0.13; 4.23 and 1.22.Pollution Index(PI)of the contaminant elements from Budapest,Budapest suburb and Seoul were 4.2 and 0.6; 0.9 and 0.4; 7.8 and 2.7.Contamination Index(CI)of the contaminant elements from Budapest,Budapest suburb and Seoul were 27.1 and 3.3; 4.9 and 2.7; 21.8 and 10.2.Pt,Pd and Ir concentration levels from Budapest were in the range of 133 and 1.9 ?g kg-1; 170 and 12.8 ?g kg-1; 4.5 and 0.4 ?g kg-1 in Budapest suburbs were 37 and 3.6 ?g kg-1; 39.4 and 11.3 ?g kg-1; 0.8 and 0.2 ?g kg-1 and from Seoul 98.5 and 25.6 ?g kg-1; 148 and 30.6; 5.6 and 2.1 ? g kg-1.Correlation between Pollution Index(PI)and Contamination Index(CI)of the platinum metals from Budapest Centre-0.4090(Ir),-0.3098(Pd),-0.1994(Pt); Budapest Bridges 0.8343(Ir),-0.7652(Pt),-0.7626(Pd); Budapest suburbs were 0.5266(Ir),-0.2863(Pd),-0.0333(Pt)and Seoul were 0.3193(Pd),0.2874(Ir),-0.0017(Pt),respectively.The highest Pt,Pd and Ir levels in road dusts were found from major roads with high traffic volume.Significant difference between heavy traffic roads in Pollution Index(PI)and Contamination Index(CI)from Seoul and Budapest were 4.0 and 5.9; in light traffic roads 2.9 and 11.0.Light traffic roads reflects that an important source of Pt,Pd and Ir in roadside environment is automobile catalytic converter.Road dusts with high Pt,Pd and Ir level were enriched in traffic-related contaminant elements also.