Firefighters are working throughout the night to contain dozens of out-of-control bushfires across NSW before strong winds return to fan the blazes.
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All 75 blazes are at advice level and crews are working to strengthen containment, NSW Rural Fire Service said on Twitter on Monday night.
Thick smoke is expected to hang over much of the state's northeast due to the fires and residents have been warned it could reach hazardous levels on Tuesday.
A blaze at Ellangowan in the Richmond Valley flared up earlier in the day briefly prompting an increased warning from the RFS.
The fire has burnt more than 3000 hectares with firefighters and water-bombing aircraft working to contain the blaze before wind whips up again.
It is still out of control.
Another out-of-control bushfire at nearby Kippenduff was brought down to advice level thanks to fire crews late on Monday.
Isolated rural properties will be the main point of concern for firefighters.
Crews also gained the upper hand on major fires near Lennox Head and Salt Ash, north of Newcastle, and another near Bega.
Bureau of Meteorology senior forecaster Katarina Kovacevic says increased wind speeds of up to 40km/h will hit the northern NSW coastline before easing into the evening.
Northern NSW is expected to get a reprieve on Tuesday with winds stronger in the Blue Mountains, Southern Tablelands and the Illawarra.
Three homes and more than 20 buildings have been destroyed by fires across NSW since the middle of last week.
Helicopter pilot Allan Tull died on Friday while conducting aerial water-bombing on a blaze near Ulladulla.
So far six people have been charged with deliberately lighting fires.
Australian Associated Press