You could live in the office - that's free.
Or you could move to Tung Chung and get the annual "Hong Kong Cough", the season for which is starting just about now, judging by the number of furballs baing hacked up around here at the moment...
If you want the cleanest air in HK and an expensive expat life, then Sai Kung is the place, but it can take 45 mins to 1.5 hrs to get to the airport.
Good Luck,
N1 Vibes