We found severe Pbcontamination on the roads of S1 (to the smelter S1), S2(across the smelter S2 site), and C (across the collectionsites Cs). Median Pb concentrations of roads S1, S2, and Cwere 10,000 (n = 40), 7200 (n = 26), and 6400 (n = 20)mg/kg, respectively (Table S1).
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