A photograph, combining two images, showing Beijing from the top of Jingshan Park – one with blue sky (left) taken on December 2, 2015, and the other with serious smog taken one day before, on December 1. Photos: Simon Song
A photograph, combining two images, showing Beijing from the top of Jingshan Park – one with blue sky (left) taken on December 2, 2015, and the other with serious smog taken one day before, on December 1. Photos: Simon Song