Results and Discussion
Heavy Metal Concentrations in Dust. Themeanheavy metal
concentrations of dust collected from the workshops, roads,
and paved areas of public places are shown in Figure 2. Many
of the results revealed large standard deviations indicating
the highly heterogeneous nature of the dust samples. To
evaluate the extent of heavy metal contamination in the dust,
the concentrations were compared to several soil guidelines
(Supporting Information Table S1). Currently, there are no
guidelines or regulations for heavy metals in dust. In general,
the metal concentrations of workshop dust were statistically
higher (p < 0.05) than those from the other sampling sites.