A large TV screen in Beijing's Tiananmen square shows a piece of blue sky against a smoggy backdrop on Friday. Photo: Simon Song
A large TV screen in Beijing's Tiananmen square shows a piece of blue sky against a smoggy backdrop on Friday. Photo: Simon Song
Heavy traffic in downtown Beijing as the sky is darkened by smog in the early afternoon on Friday. Photo: Simon Song
Heavy traffic in downtown Beijing as the sky is darkened by smog in the early afternoon on Friday. Photo: Simon Song