## 3 Results
### Our Elemental Contents and the Published Data  
To minimize possible temporal differences, we searched only for publications where dust was sampled not more than 15-20 years ago. The next criteria in search of information for comparison with our elemental contents were to avoid data determined by quite different analytical methods and to choose studies with results of the real total contents of elements [31]. If measurements were done not by XRF or INAA (without digestion), but by ICP-ES, ICP-MS or AAS, only the studies where HF (with other acids) was used to digest the samples were selected (Table S3). The third criterion was dust particle size. As we have shown (Figure 4), only in exceptionally rare cases did the dust particles sampled in Klaipeda fall into the interval 50-100 \(\upmu\)m or exceed it. Therefore, the data of studies where road dust researchers consider <250 \(\upmu\)m fraction [60] or even larger particles, e.g., <500, <1000, or <2000 \(\upmu\)m [75,76], as dust were not chosen for comparison. Moreover, we refused with great regret from publications with some other strange data: (i) where the given mean contents of several analytes, for example, Ti and Cr in mg kg\({}^{-1}\) are only 0.024-0.02 and 0.023-0.02 [77], since they are below the detection limits of XRF; (ii) where the sum of the contents of studied chemical elements is 100% and in one case is even 128% [78]. We also could not access the required data from some publications, e.g., [79], because only the volume concentrations (ng m\({}^{-3}\)) of analytes were presented without indicating the concentration of dust (\(\upmu\)g m\({}^{-3}\)), therefore their re-calculation to mass concentrations was impossible. According to the aforementioned selection criteria, some publications such as [66,80,81] seemed to be appropriate information sources for comparison with our TSP data (Table S3). We also present for comparison the elemental results of dust: (i) collected from the snow cover [56,57], (ii) caught by pumping PM10 and PM2.5 from air above the ground [18,82,83,84], (iii) \"inhalable road dust particles sucked directly\" from the pavement [8,35]. A review of the selected publications revealed that the differences in elemental contents may be determined not only by objective factors such as anthropogenic or natural specificity of research area, but also by subjective features of sampling, sample preparation and conditions of analysis. Sampling alone depends on (Table S3): (i) sampling time, e.g., year, season, prevailing momentary meteorological conditions; (ii) specific location of sampling site and certain height above the ground (for unknown reasons, the height is even not indicated in some studies); (iii) sampled particle size and sampling tools. Therefore,  
Figure 4: Dust particle size in (**a**) iron ore handling environment (near site B, Figure 1) and (**b**) in southeastern part of the city (near site E, Figure 1) (**b**). Arrows highlight non-ferrous crustal (silicate and other) minerals. Photographs were taken using microscope ”Nikon Eclipse Ci-L”. The grid was added using software “imagel”. the comparison of such data has uncertainty. With this in mind, for each element, the correspondence (%) between our and selected published data was estimated by percentage of reference values within the 25 th-75 th percentile interval of our study (Figure 5). The arrangement of PHEs according to descending correspondence is Cr > Zn > Cu > S > Ni. It should be noted that the mean values of PHEs As, Pb, V, as well as of halogen Br given by other researchers exceeded our 75 th percentile. The crustal elements were arranged as follows: Fe > K > Sr, Zr > Rb> Mg, P > Ca > Si > Al > Mn. Halogen Cl (57% correspondence) appeared among the analytes (Fe > Cr > Zn > K) with higher than 50% correspondence. It was found that when choosing the analytes, researchers give priority to PHEs.