NPWS South Branch Director Kane Weeks said the 323 hectare burn around Eden Cove follows a burn conducted last week in the northern part of the park near Haycock Point.

"During today's burn at Eden Cove there will be park closures in place and all visitors should check the NPWS alerts page for up to date information on track and area closures," Mr Weeks said.

"The burn covers the area south of Eden tip and as a result North Head Road, Lennard's Island Road, Terrace Beach Road and the Bell Bird Creek fire trail will be temporarily closed."

All beaches, walking tracks fishing and informal access to the area will also be closed.

"This burn, which is expected to take approximately two to three days, is essential as it treats an area that was not directly impacted by the Black Summer bushfires," Mr Weeks said.

"It will help to reduce fuel loads in the park, protect nearby private properties and maintain biodiversity.

"Working with the RFS we have scheduled this burn to take advantage of forecast favourable conditions and to continue our autumn hazard reduction program," Mr Weeks said.

"This burn may produce smoke that will be visible to nearby communities. Motorists in the vicinity are advised to take care, observe all signage and directions from RMS or fire crews."

Smoke from bush fires and hazard reduction burning can affect some people more than others.

NSW Health reminds people that children, older adults and those 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.

This burn is one of 12 hazard reduction burns NPWS has planned for the Sapphire Coast area this autumn, and one of the many burns undertaken by NPWS across NSW each year.

For more information on hazard reduction activities visit the Rural Fire Service and their 'Fires Near Me' app.