Tanya Ferguson lives in Sydney. On September 23, she woke up to a strong wind blowing through her window. She then saw that the room was completely orange.
"I could not believe my eyes," she told BBC news. She thought there was a bush fire. But when she went outside, the whole city was covered in a film of orange dust.
"It was like being in the outback, but it was right here in the city," she said.
On that day, a big dust storm swept through Sydney. It covered the city in orange dust for about eight hours, and people can't see landmarks such as the Sydney Opera House and Harbor Bridge.
The storm influenced the transportation system. Flights were put off. Roads were busy in the difficult conditions. Children and the elderly were told to stay indoors until the dust had cleared. Later strong winds blew it out to sea and up the coast. No one was hurt in the storm, though health officials and emergency services answered hundreds of calls from people with breathing difficulties.
Dust storms are common in the Australian outback, where the land is poor. But the storms hardly reach the coastal areas. Officials said it was the worst dust storm of the past 70 years. Experts said that dry conditions in the outback and strong winds caused the sandstorm.
"Ten very dry years over inland southern Australia and very strong winds have co-operated to produce the storm," said Nigel Tapper, an environmental scientist at Monash University, Australia.