Table 1: Heavy metal pollution of soils in various regions.

CountryLocationMetal content (mg/kg)References
CrPbCuZnCdNi

ChinaGuangdong260015048003301.21480[9]
ChinaA rural area, Jianghan plain253.84.8864.620.3589.5[13]
RussiaEkaterinburg1027370663[6]
FranceSouthern tailing area900016,000[5]
Turkey73 places8309681671651.7249[7]
GreeceLandfill site1729335634418.866[14]
VietnamMining areas135105028476.9[8]
IndiaNuggihalli, Karnataka486384.1153.61398[15]
Background value in soil13331.8411140.31458[16]