Took the "Red Loop" today on Hong Kong Island and a harbour tour.
Never complain about air quality. The "fog" isn't fog. It's the poor air quality here. Not good for people with asthma which I am one. Ended up wearing a mask. It helped. You will see from the pictures from the harbour tour the poor visibility.
Riding around on the bus was interesting. Lots of high end shopping in Hong Kong and traffic today.