Workers walk at a construction site in the heavy haze in Beijing's central business district

 
Workers walk at a construction site in the heavy haze in Beijing
Workers walk at a construction site in the heavy haze in Beijing's central business district, January 14, 2013. In an unusual display of unity in criticising a troubling domestic social problem, Chinese media are giving prominent coverage to the historically high level of air pollution that has choked wide swaths of the country for the past few days. Air quality in Beijing was far above hazardous levels over the weekend, reaching 755 or higher, according to an index known as PM2.5. The World Health Organisation recommends a daily level of no more than 20 for PM2.5, which measures particulate matter with a diameter of 2.5 micrometers. REUTERS/Jason Lee