THE blanket of smoke which enveloped the Tweed over the past few days is nothing to worry about, according to the Rural Fire Service.

Far North Coast RFS Superintendant Matt Inwood said despite a number of local fires, most of the smoke is from North Stradbroke Island.

Mr Inwood said three fires at Parmvale, Hidden Valley and Cobaki are under control.

"Crews attended a structure fire at 5am at Palmvale," Mr Inwood said.

Mr Inwood said a grass fire on Piggabeen Road at Cobaki began late last night.

"It was a reignition of a fire from last night between 9 and 10pm," Mr Inwood said.

"It's burning in peat, meaning the fire continues to burn underground."

Mr Inwood said while peat-rich soil would make it more difficult to extinguish the fire, no property would be at risk. He said crews are still attending the fire.

It's understood firefighters are patrolling the Cobaki site several times a day.

Mr Inwood said a lightning strike is believed to have caused a fire at Hidden Valley near Tyalgum.

He said after crews worked on the scene, it has been reduced to a single burning log.

Mr Inwood said these fires pose no immediate threat to the surrounding areas.

The cause of the Cobaki and Parmvale fires are not yet known.

Mr Inwood said residents should be aware permits will remain suspended until further notice.