Photos: Fog or smog? Pollution at dangerous levels in China
73075129
Credit: Getty Images
BEIJING, CHINA - JANUARY 29: A little girl wears the cartoon mask at the Tiananmen Square during severe pollution on January 29, 2013 in Beijing, China. The 4th dense fog envelops Beijing with pollution at hazardous levels in January. (Photo by Feng Li/Getty Images)
