Severe Air Pollution Continuous In Beijing

BEIJING, CHINA - JANUARY 30: A woman and her daughter wearing the mask walk on the Tiananmen Square during severe pollution on January 30, 2013 in Beijing, China. The fourth round of heavy smog to hit Beijing in one month has sent more people to the hospital with respiratory illnesses and prompted calls for legislation to curb pollution. The haze choking many Chinese cities covers a total area of 1.3 million square kilometers, the China's Ministry of Environmental Protection said Tuesday. (Photo by Feng Li/Getty Images)