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March 25, 2013 12:00 AM

As U.S. tightens rules on lead emissions, battery recycling has moved to Mexico

Mexico’s standard for lead emissions standards are 10 times less stringent than the United States’. Since 2004, that’s meant a fivefold increase in the number of spent car batteries being shipped to Mexico from the United States and a dwindling in U.S.-based smelting operations to just 14.

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