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More than 100 fires burn across Australia's east coast

Strong winds stoked more than 100 fires across Australia's east coast on Tuesday, blanketing Sydney in hazardous smoke and prompting health warnings for the country's most populous city.

Sydney residents urged to stay inside as wildfire smoke blankets city

Sydney, Australia chokes in hot, dry smoke as dozens of wildfires rage through New South Wales 0:28

Strong winds stoked more than 100 fires across Australia's east coast on Tuesday, blanketing Sydney in hazardous smoke and prompting health warnings for the country's most populous city.

Australia is prone to wildfires during its dry, hot summers, but fierce blazes have been sparked early, in the southern spring, by a long drought and soaring temperatures.

The fires have this month claimed at least four lives, burned about one million hectares of farmland and bush and destroyed more than 300 homes.

Powerful winds fanned around 130 fires that have been burning across New South Wales and Queensland states for several days, and pushed smoke south to form a thick haze over Sydney, home to around five million people.

Officials said the air quality above parts of the harbour city was measured at 10 times hazardous levels on Tuesday and advised people to stay indoors as much as possible as the smoke lingers over coming days.

"We know that heat waves cause severe illness, hospital admission and even deaths, and that people are more sensitive to heat waves early in the season," Richard Broom, director of environmental health at NSW Health said in an emailed statement.

"The combination of heat and poor air quality adds to the risk."

In NSW, firefighters were scrambling to strengthen fire containment lines ahead of forecast higher temperatures for much of the rest of the week.

Fire crews have been fighting dozens of blazes like this one, which burned in Colo Heights, Australia, last week. (Brett Hemmings/Getty Images)

"More than 1,300 firefighters are working on these fires, undertaking backburning operations and strengthening containment lines ahead of forecase hot, dry and windy weather, with seven areas under a total fire ban," the NSW Rural Fire Service said in a statement.

The current bushfire crisis has mostly been contained to the east coast of NSW and Queensland states, but officials in South Australia warned on Tuesday that anticipated near-record temperatures raise the risks in that state.

Australia's Bureau of Meteorology said temperatures in Adelaide, the capital of South Australia, will hit 42 C on Wednesday, which coupled with strong winds would create "catastrophic" fire danger conditions.

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