A severe asthma warning has been upgraded in parts of the country with authorities concerned air quality could pose health concerns.
The smoke haze that's blanketed Sydney is expected to remain over the weekend, while Melbourne is facing thunderstorms that could trigger attacks.
The air quality for the greater Sydney region is rated hazardous with 70 bushfires across the state, and vulnerable residents have been warned to stay inside until the skies clear.
People with asthma or hayfever in Melbourne and parts of Victoria have been alerted to the potentially deadly risk of asthma triggered by coming thunderstorms.
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