The NSW RFS is informing residents of Hornsby and the Central Coast to expect smoke haze in the coming days, with hazard reduction work to begin.

A 1500 hectare burn will be undertaken south of Brooklyn and east of the M1 from tomorrow (Friday August 6).

On Sunday, smoke is expected to settle across a broader area of Sydney.

Residents are urged to only call 000 if they see an unattended fire.

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Image: NSW RFS