is there an area that is better than others to live in if i decide to go?
The real answer is No!
You'll have some debate on this one but dead set...If the pollution in Tung Chung (read airport) is high/severe, Sai Kung, Central and DB will be within a couple of points! You can get more info from
http://www.epd-asg.gov.hk/ but be aware the Low/High/Severe/Extreme categories have somewhat skewed limits compared to the real world. Read- your high would be a low here.
F Man out