Melbourne is currently being smothered in smoke from the New South Wales and Gippsland bushfires.
Light winds mean the smoke is likely to visible until Saturday morning.
Smoke and dust may reduce driving ability and drivers are being reminded to follow all road rules and take into account the conditions.
Anyone experiencing wheezing, chest tightness or difficulty of breathing should dial 000.
Anyone with a heart or lung condition is being told to take their medication and asthmatics should follow their prescribed asthma plan.