I think it would be useful to red flag particular Chinese cities with high levels of air pollution, and towns where heavy industry exists. Not sure that red flagging certain provinces is fair.

I have never met any expats who have had tumors in China. My experience in this regard is very different from that claimed by Taffy. However, it's likely that he has been living in different parts of China from me.

I should add that certain cities such as Linfen of Shanxi have improved the quality of their air significantly. But we should nevertheless red flag them because of their likely ground toxicity that would remain a high risk factor.