Competitors are shrouded with smog as they take part in the Men's 50 km walk race during the 2008 BBMG IAAF Race Walking Challenge around the National Stadium, or the 'Bird's Nest', on April 19, 2008 in Beijing, China.
2008 Beijing Olympics - April 19, 2008
111 Days Before the Olympics
By Marc Lallanilla, About.com Guide
Smog clouds the sky 111 days before the Olympics.
Photo by Guang Niu / Getty Images
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