A woman wearing a mask walks past a billboard, which is used to surround a construction site, on a heavy hazy day in central Beijing, January 16, 2014. REUTERS/Jason Lee (CHINA - Tags: ENVIRONMENT ... more 
A woman wearing a mask walks past a billboard, which is used to surround a construction site, on a heavy hazy day in central Beijing, January 16, 2014. REUTERS/Jason Lee (CHINA - Tags: ENVIRONMENT SOCIETY BUSINESS CONSTRUCTION) less 
1 / 28
Reuters | Photo By JASON LEE / REUTERS
Thu, Jan 16, 2014 12:37 AM EST