Sunday mid morning and the Viz is crap 2700m HZ according to the observatory for HKIA.
But I would like to draw your attention to
www.cleartheair.org.hk and my friends you will see that today Tung Chung (inter-alia HKIA) has the lowest measured RSP's for all HKG ie. the airport environment is the place to be today!
Take that sports fans.
AFL