Breathtaking: World's 25 Most Beautiful Polluted Sunsets

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

Photograph by Stockbyte/Getty Images

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#20 Mexico City

Some of the best sunsets still occur in pristine lands. When conditions are right, there are plenty of naturally occurring particles in the lower atmosphere to cause explosive sunsets, and the last rays of the day are unimpeded by industrial haze.

That's not the case in Mexico City. The urban area has a dense population seated in a bowl-shaped valley surrounded by mountains and volcanoes -- the perfect conditions for extreme pollution.