North-easterly winds are pushing the smoke along the coast to areas including Newcastle, Sydney and the Illawarra.
The smoke is expected to settle in these areas and may continue for the next few days.
NSW Health reminds people that children, older adults and people with heart and lung conditions are most susceptible to the effects of air pollution and excessive smoke.
If you have asthma or a lung condition, reduce outdoor activities if smoke levels are high and if shortness of breath or coughing develops, take your reliever medicine or seek medical advice.
Asthma sufferers need to follow their Asthma Action Plan and take their relieving medication where necessary. If symptoms get worse, seek medical advice. Further advice is available from the Asthma Foundation website. https://www.nationalasthma.org.au