Shortly,
You forgot to mention the vis?? How is it 2-3 km ??On a day like that it should be unlimited. When's the last time you saw the horizon or the sun actually set, not disappear into an orange haze.
Do you truely belive that the air quality has no affect on you? If so you are very,very naive!
By the way I left H.K years ago, went on a base. Best move of my life!