China's capital Beijing, seen here in contrast between blue-sky and smog-filled days, recorded historic air pollution levels in January 2013. Hazardous air quality days have pushed Beijing to enact stricter air pollution policies for the country -- including naming and shaming the nation's top ten worst polluting cities.
{"Image ImageDescription": "two photos comparison of Beijing's Air Pollution in Jan, 2013.\rthe clear day was taken the day after the heavy rain on July 21,2012 in Beijing, which killed at least 77 citizens in Beijing.", "Image Artist": "CY Xu"}