Darling Harbour / Monorail. Credit: maude_au, Flickr (CC)

Spooky outside. Credit: psychopyko, Flickr (CC)

Surfing on Queensland's Gold Coast during the dust storm on September 23. Credit: Michael Dawes, Flickr (CC)

The Moderate Resolution Imaging Spectroradiometer (MODIS) on NASA's Terra satellite captures the dust storm in the main portion of this image. Credit: NASA

Bondi Beach. Credit: Stuandgravy, Flickr (CC)