Originally Posted by
moondog
I've never had a problem with locally bought (e.g. Chinese) insect repellents and coils. Mosquitoes actually aren't that bad in Shanghai, compared to other humid places I've lived, perhaps because it is so densely developed, but they are still annoying enough to warrant repellent when outside during summer evenings.
I don't recalled having any major issues with mosquitoes in major Chinese cities as well, but I think a bit of common sense will help. For me, I never leave my hotel room door open for an extended period of time. And I think there if there's no vegetation for mosquitoes to live in and a water source, I think in general, I'll be ok.