You're right it isn't THAT great here in HKG, but we think "200" is uber uber high, and SH beats that mark quite a lot, if I'm not mistaken. I think estimates are that 50% of HK's pollution is "imported" - the HK government seems to be reluctant to take local measures to improve things itself though (bus and shipping emission standards etc).

Plus we have great weather, beaches, low taxes, connectivity to the world, easy visa process etc etc etc... - oh and the food is safe