La Oroya
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La Oroya is a city in Junín Region, Peru. It is located at around , at an altitude of about 4000 m. It was named in 2006 in a list of the 10 most polluted places on earth by the Blacksmith Institute, a US-based environmental charity [1]. Studies carried out by the Director General of Environmental Health in Peru in 1999 showed that ninety-nine percent of children living in and around La Oroya have blood lead levels that exceed acceptable amounts. The town prides itself on its industry, a smelter and a refinery. Most major roads in this highland area pass through La Oroya consequently visitors are likely to spend at least some time here.