Sydney and Wollongong residents are being reassured the smoke blanketing parts of the city is from controlled hazard reduction burning.
NSW firefighters are undertaking a number of hazard reduction burns across the state while conditions are favourable.
Those close to the Ku-ring-gai, Northern Beaches and Sutherland will see the most smoke.
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— NSW RFS (@NSWRFS) October 20, 2016
Authorities are advising residents to not panic about the smoke, but to report any unattended fires by calling 000.