Breathtaking: World's 25 Most Beautiful Polluted Sunsets

By Tom Randall - 2011-11-28T03:40:43Z

Photograph by David McNew/Getty Images

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#4 Mexicali, Mexico

The twin border cities of Calexico, California, and Mexicali, Mexico, appear below a full moon marking the autumnal equinox. The rock formations are bisected by the U.S.-Mexico border, which separates nationalities but not airborne pollutants.