NPWS area manager Michael Phelan said the three-hectare burn is in the Jervis Bay National Park near St Georges Basin.

"This burn will help protect the Wrights Beach Strategic Fire Asset Zone and to limit the potential spread of wildfire to surrounding private properties," Mr Phelan said.

"The burn is due to begin at about 10am and motorists are reminded to drive to conditions and observe and warning signs or directions from fire crews.

"Public access to these areas will be closed during the burning operations and smoke from the burn is likely to be visible in the area.

"We thank our neighbours for their understanding.

"People with asthma or who are susceptible to respiratory problems are advised to keep clear of the area or stay indoors."

These burns are some of the many hazard reduction operations undertaken by NPWS across NSW each year, many with the assistance of the NSW Rural Fire Service and Fire and Rescue NSW.

This hazard reduction burn is part of the NSW Government's $76 million package over six years to boost bushfire preparedness and double hazard reduction in the State's national parks, where conditions allow.

For health information relating to smoke from bush fires and hazard reduction burning, visit NSW Health or the Asthma Foundation.

More information on hazard reduction activities visit the Rural Fire Service and the Rural Fire Service 'Fires near me' App.