Coming soon to a city near you?
Welcome to Shanghai. But not only Shanghai. If you follow the prevailing winds from the east coast of China, where does it lead? I’m not sure either, but I imagine it’s not good. From the Guardian photo series called Coal in China.
An article from 2007 confirms your suspicions:
Asian air pollution affects our weather
http://articles.latimes.com/2007/mar/06/science/sci-asiapollute6