Good point Maggie. It could well be.
I was there yesterday, stood on the bridge, took a few deep breaths and, nothing......
Didn't make a point of doing that especially but, it was "Gridlocked", by the Horizon,with a parked coach ,cars trying to get past either way and cars parked just about anywhere. No where to go so parked up and took in the view and air for 5 minutes.
The Mirage was quite busy, and the grass looked very green!
Negg