Rural Fire Service says smoke is expected to clear by the weekend when runners compete in the Sydney Marathon

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A haze of smoke has settled across Sydney for another day, with hazard reduction burns continuing ahead of the weekend when temperatures are forecast to hit 30C.

Much of Sydney was blanketed in smoke early on Thursday morning with poor or very poor air quality in suburbs including Alexandria, Earlwood, Lidcombe, Randwick, Rozelle, Prospect, Rouse Hill, Bringelly and Oakdale.