Early this morning, Yass firefighters controlled a large pile of mulch which became alight at Martin's Fertilizers.

The fire became alight about 4am. Fire and Rescue NSW Station 511 Yass and three Rural Fire Service brigades were on scene.

There are no concerns of the fire becoming out of control, NSW Rural Fire Service operational officer for the Southern Tablelands, Lachlan Gilchrist, said.

"It's well-contained, fortunately," he said.

Another bush fire is burning across 37 hectares near the Kangara-Boyd National Park, north of the Wombeyan Caves.

Firefighters have the blaze under control.

Yesterday, catastrophic fire danger was recorded in the Greater Sydney, Greater Hunter and Illawarra and Shoalhaven areas.

Conditions have eased, however there is a large number of fires still burning throughout the state.

People are reminded to stay up to date on the Fires Near Me app for smart devices or at the Rural Fire Service website: rfs.nsw.gov.au. Major fire updates are available here.

For more information contact the Bush Fire Information Line on 1800 679 737

Information on public transport - transportnsw.info or call 131 500

People in and around fire affected areas can register online with the Red Cross operated Register Find Reunite site at register.redcross.org.au

For information on evacuation centres visit Emergency NSW: emergency.nsw.gov.au

For a list of public school closures: education.nsw.gov.au

Catholic schools: csnsw.catholic.edu.au

People are urged to include animals in a bush fire plan.

Bushfire affected landholders requiring emergency fodder, emergency water, livestock or domestic animal assessment can call the Animal and Agriculture Services Hotline on 1800 814 647.

For concerns about pets, companion animals and wildlife please also contact 1800 814 647.

People can visit the Local Land Services website for more information.

Keep at least 8 metres away from fallen power lines or objects that may be energised, such as fences.

Report fallen power lines to either Ausgrid (131 388), Endeavour Energy (131 003), Essential Energy (132 080) or Evoenergy (131 093), as shown on your power bill.

All visitors to national parks are reminded that a Total Fire Ban has been declared and all forms of flame-based cooking and barbecues are not permitted. For more details visit: rfs.nsw.gov.au.

A full list of national park closures: nationalparks.nsw.gov.au

Check road closures on livetraffic.rta.nsw.gov.au.

For general information or assistance about the bush fires please call the Public Information Inquiry Centre on 1800 227 228.

For non-urgent assistance please call your local police.

Anyone who sees suspicious or illegal behaviour is urged to contact police via Crime Stoppers on 1800 333 000 or visit: crimestoppers.com.au. Information is treated in strict confidence. The public is reminded not to report crime via NSW Police social media pages.

Finally, if you require emergency assistance please call 000.