Boxjockey-You got a problem with HongKongers? What Agnes said is true. That's a fact. If the city is such an abysmally toxic place as you all suggest, then why are HKers having such long lives? We all would have been poisoned dead long ago if that was the case.
Don't get me wrong, pollution can be very bad, especially with that sandstorm earlier this year, it was downright unbreathable. But other times, it's not that bad. You have to gauge it in a scale of "badness" of pollution.
Here is my totally unscientific but more practical way of knowing whether pollution is bad on a particular day. If you can see Macau, Zhuhai or in the general the western shore of the Pearl River Delta from HKG, then pollution is low (usually the summer months). If you cannot see it, then pollution is high (rest of the year).