Flights have been affected, ferries have been brought to a standstill and motorists are facing traffic nightmares from a thick blanket of fog which has descended over Sydney.
Eerie pictures show fog blanketing the Sydney Harbour Bridge on Monday, reducing visibility to barely more than 100 metres during morning peak hour.
Sydney Ferries suspended all voyages for a time.
Flights have also been affected, with air traffic control spacing out arrivals and departures due to the poor visibility.
