Beijing is well, and fairly, known for its pollution problem. This photo from 2002 probably is from a “good” day. I imagine the situation has gotten worse over the years. However, what really makes me wonder in this picture is the ratio of cars to bicycles. I wonder if there is that much space for bicycles anymore…
A shame you don’t have a picture of present day Beijing. Who knows, maybe you couldn’t distinguish cars fom bicycles as a result of the increasing pollution.