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A survey was performed to trace the main source of anthropogenic Pb pollution in Mexico City through Pb isotopic signatures ( 208 Pb/ 204 Pb, 206 Pb/ 204 Pb, 206 Pb/ 207 Pb, and 208 Pb/ 207 Pb) from 103 urban topsoil (0–5cm) samples. Those were collected in the metropolitan area of Mexico City and compared with isotopic compositions of...