Breathtaking: World's 25 Most Beautiful Polluted Sunsets

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

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#23 Poznan, Poland

Shorter wavelength lights -- blue and violet -- are more easily scattered by particles in the atmosphere. That leaves a greater concentration of longer wavelength reds and tangerines to set the horizon ablaze. Fine-particle pollution can intensify both the color and brightness of sunsets.

Crews pack up their boats at sunset after training. In 2009, Poznan hosted the World Rowing Championships, the premier rowing regatta after the Olympics.