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A photographer takes pictures of the Sydney Harbour bridge as a dust storm blankets the city September 23, 2009. REUTERS/Tim Wimborne

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A combination of two images of the Sydney central business district skyline, photographed at 6:30 am (top) and 12:45 pm on September 23, 2009. REUTERS/Tim Wimborne

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A combination of two images of boats passing under the Sydney Harbour Bridge, photographed at 6:00 am (top) and 12:15 pm on September 23, 2009. A huge outback dust storm swept eastern Australia and blanketed Sydney on Wednesday, disrupting transport, forcing people indoors and stripping thousands of tonnes of valuable farmland topsoil. REUTERS/Tim Wimborne

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A cyclist rides under the Sydney Harbour bridge as a dust storm blankets the city September 23, 2009. Gale force winds battered eastern Australia, bringing huge dust storms to the nation's heavily populated east coast. REUTERS/Tim Wimborne


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An enhanced colour satellite image shows the dust storm covering over eastern Australia in this handout picture dated September 23, 2009. REUTERS/Bureau of Meteorology/Handout

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A dust storm blankets the Sydney Harbour Bridge at sunrise September 23, 2009. REUTERS/Tim Wimborne

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Light traffic crosses the Sydney Harbour Bridge during a dust storm at sunrise September 23, 2009. REUTERS/Tim Wimborne

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A pedestrian walks under the Sydney Harbour bridge as a dust storm blankets the city September 23, 2009. REUTERS/Tim Wimborne

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A combination of two images of the Sydney central business district skyline, photographed at 6:30 am (top) and 12:45 pm, on September 23, 2009. REUTERS/Tim Wimborne

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A man takes a photograph of the just visible Sydney Opera House (top L) as a dust storm blankets the city September 23, 2009. REUTERS/Tim Wimborne

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A traffic light shows red as a dust storm blankets the Sydney Harbour Bridge at sunrise September 23, 2009. REUTERS/Tim Wimborne

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A woman walks past the Sydney skyline as a dust storm blankets the city September 23, 2009. REUTERS/Tim Wimborne

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A man takes a self-portrait in front of the Sydney Opera House as a dust storm blankets the city September 23, 2009. REUTERS/Tim Wimborne

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A water taxi passes under the Sydney Harbour Bridge as a dust storm blankets the city September 23, 2009. REUTERS/Tim Wimborne

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A man wearing a dust mask walks across the Sydney Harbour bridge as a dust storm blankets the city September 23, 2009. REUTERS/Tim Wimborne.