Environment Minister Matt Kean said the $22.9 million will be invested in an increase in hazard reduction activity in and around high risk areas, and aerial rapid-response firefighting teams.

"The scientific evidence and experience of the last bushfire season is clear - extreme weather events are becoming more frequent and the level of bushfire risk will continue to increase," he said.

"Targeted hazard reduction will continue to play an important role in reducing that risk.

"The funding means the NPWS can increase its aerial rapid-response firefighting teams by up to 80 firefighters, which is a 20 per cent increase in capacity for teams which are deployed into remote and rugged locations to extinguish wildfires."

Documents leaked to the NSW Labor Party in November last year showed 115 front-line firefighter vacancies in the service, three of which were on the Far South Coast.

Shadow Environment Minister Kate Washington said national parks had been cut to the bone.

The Public Service Association claimed there had been a 35 per cent cut to fire-trained positions in national parks and alleged they were being managed by what they described as "skeleton staff".

National parks carry out 75 per cent of all prescribed burning in the state.

In 2018, a national parks staff member with over 20 years of experience said frontline firefighters were concerned for their safety following restructuring.

"We have to be able to trust each other with our lives, which doesn't happen overnight," they said at the time.

The firefighter said three experienced controllers at Merimbula, one at Bombala and two at Narooma were reduced to just one with little experience and limited local knowledge, based at Narooma.

"When you're on the end of a line, hanging out a helicopter, you want to know people have your back," they said.

"If we had a fire tomorrow, with weather like last week, with extreme fire danger and other fires around the state, it will be very difficult to manage."

Mr Kean said the new funding will also be used for an additional helicopter to ensure "world class" rapid response teams are well placed to protect people, property and the environment following unprecedented summer fires.

"One of the remarkable achievements of our NPWS remote area fire crews has been their ability to extinguish fires early, even in very remote locations, preventing them from becoming larger and more dangerous fires," he said.

"During the extreme 2019-20 season, NPWS remote area firefighters contained more than 20 fires in the Blue Mountains to an average of less than 1.2 hectares which is outstanding.

"The NPWS aerial response capacity was also critical in saving the Wollemi Pine."

He said the service contributed more than 43,000 staff days to the 2019-20 firefighting campaign, led by the NSW Rural Fire Service.