Fig. 6
From: Low presence of potentially toxic elements in Singapore urban garden soils
Concentrations of Cu (A), Pb (B), Zn (C) and Cd (D) at garden (diamond), park (circle), and woodland (triangle) sample sites in Singapore. Concentrations are presented relative to levels of risk (top of Table 4). The background in each map varies to allow comparison of the study sites with the road network (A), major parks, industrial areas, water bodies and shipyards (B) and large geological formations (C). The base maps in A–C do not necessarily reflect an impact on the element that is mapped