Shanghai again chokes under 'severe' pollution

A man takes a picture with a landmark building in Shanghai Bund, a waterfront area seen through the haze on Dec 6, 2013.  Air Quality Index (AQI), which measure PM2.5 particulates, topped 400 on Friday morning in Shanghai, meaning the city was "severely polluted" - the highest level on the air pollution scale - for the second time in a week. [Photo/icpress.cn]