Don't panic Dick. (I like this word-- this is the core slogan for "HitchHiker's Guide to the Galaxy" )
It will not only RC's problem. Air/noise polutions caused by cars are affecting many areas like Ma Wan Cheung Sha Wan even Manhattan Hill (sorry diedsee). On the positive side it gives a good view of world class landmark.
For poisonous chemicals HK is so small that it would affect everyone.