City/country Elements
Cd Cu Ni Pb Zn
Africa Land /Angola 11.5 41.78 10 351.3 316.6
Asia Amman/Jordan 3.1-11.2 66.5-350 43-88 210-1131  116-410
Bahrain 72  - 126 697.2 151.8
Europe Madrid/spain  - 188 44 1927 476
Palermo/Italy 1.1 98 14 544 207
Paris/France 1.7 1075 25 1450 840
North America Hermosillo/ Mexico 4.25 26.34 4.7 36.15 387.98
Ottawa/ Canada 0.37 65.84 15.2 39.05 12.5
Table 9: Global comparison of heavy metals with present study data (ppm).