The ten hectare zone is directly adjacent to homes on Illaroo and West Cambewarra Roads and is an accumulation of 20 years worth of fuels, although a majority of the reserve had been burnt in a wildfire over two years ago.

During the burn, parts of the roads will be closed and motorists must adhere to all safety signage and directions from fire crews.

Julieanne Doyle is a team leader of the National Parks rangers in the Shoalhaven and said the weather is perfect for hazard reduction burns at this time of year.

"We're getting up to 90 to 100 per cent humidity [of an evening] which just adds a layer of moisture that helps keep it cool. And that will help with our recovery efforts tomorrow as we're blacking out all the edges and making sure the burn is safe," she said.

"It also means there is a good amount of moisture in leaf litter so hopefully we just get that top layer burnt off so that underneath it stays relatively cool which will help with seed germination."

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The NPWS Ranger Team Leader was instrumental in the Nowra regional control room during the Currowan fires.

But on hazard reduction days she reverts to a crew member.

"I joined the RFS when I was 23 and that's when I received my fire training, and then I moved to Broken Hill, which doesn't have wildfires. So I've only just come back to the South Coast and I'm re-accruing my hours to be able to progress to different roles," she said.

"I really wanted to be a ranger and firefighting is an integral part of a rangers role. So I made sure I got that training through my volunteer organisation and I absolutely loved the brigade I worked with."

Ms Doyle said the NPWS strategy of forest management is to maintain a 'mosaic pattern' of new growth and mature trees.

"We work on biodiversity thresholds so that there are enough mature trees to set seed," she said.

The organisation works out what to burn based on data that compiles previous year's bushfires.

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 Shoalhaven area this autumn, and one of the many burns undertaken by NPWS across NSW each year.