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The U.S.-Mexico border fence, running from upper left to lower right in this 2004 aerial photograph, divides Nogales, Ariz., on the left and Nogales, Sonora, on the right.

The Environmental Protection Agency and Arizona agree that the city of Nogales would be in compliance with clean-air standards, if it wasn't for 90 percent of their pollution drifting over from Mexico. Read more»