I have never had a 'toxic air' problem nor have I met anyone who has. It is, of course, possible that a very few people have a genetic predisposition to irritation caused by tiny concentrations of pollutants. It will be interesting to see how the B787 fares in this respect. My guess? Just the same.
I think we are becoming a little precious about this stuff. I can recollect breathing trichloroethylene fumes in industry and diesel fumes in ships' engine rooms and a bus garage (that was the worst all starting from cold). I am not suggesting that we return to the bad old days before fume extractors etc but I'd swop being in an aircraft with breathing the northerly wind in HK any time.