This brings back memories. I've been there many times, and am scheduled again for next month. Great photos!

Regarding air quality: I have never ever seen it better than in these photos. Once we had some Chinese chaps over to Melbourne for training; one day they were enjoying a break outside, and they were staring at the daytime moon. One asks, "Do you ALWAYS see the moon here??" Turns out they have never seen the moon in the day!! At the best of times I have trouble seeing the sun there