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  • Type of pollution : Hexavalent Chromium Source of Pollution: Chromite mines Hexavalent Chromium is a carcinogenic type of steel used for leather tanning. In Sukinda, India, studies show that the drinking water includes more than double the international standard of Hexavalent Chromium. An India health group estimates that nearly 85 percent of deaths in mining areas due to diseases that stem from chromium exposure.
  • Type of pollution : chemicals and metals Source of pollution: Industrial estates Vapi, India might be higher on this list if it weren't for its slow growth. The city's groundwater has been found to contain mercury levels almost 100 times higher than the World Health Organization's recommended amount. Heavy metals can be found in the city's crops and air
  • Type of pollution: Sulfur dioxide, lead, copper, zinc Source of Pollution: Metal mining and processing La Oroya,Peru has the dubious distinction of being a city where 99 percent of children's lead blood levels that are higher than the acceptable limits. According to the World Health Organization, the lead level is three times the acceptable limit.
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