World's most polluted cities
Take a look at some of the world's most polluted cities, as ranked and compiled by Time, the Blacksmith Institute and ABC Environment.
La Oroya, Peru -- In this lead mining town in the Peruvian Andes, 99 percent of children have high levels of lead in their blood largely due to an American-owned smelter that's been polluting the city since 1922, according to Time. The expended lead is expected to remain in the soil for centuries, with no plans to clean it up.
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