Smoke from the bushfires burning on the mid north coast filled the sky in Armidale on Monday.
With the city covered in a pall of smoke, an RFS member said it was coming from the bushfires that are burning from the Port Macquarie region, the Macleay Valley and near Nambucca Heads, as well as the Carrai Creek fire closer to Armidale.
"We're seeing significant smoke drift from the fire activity to the east of Armidale," an RFS spokesperson said.
Meanwhile, health professionals are warning people of the danger of smoke pollution.
"Smoke is a form of air pollution which has effects on people's lungs and heart," Armidale GP Dr Sujata Allan said.
"Even if people don't have pre-existing health conditions, it can make people quite unwell. If the smoke is bad, people should stay inside and not do activities such as sport that get them out.
"People with chronic health conditions or the elderly should take particular care. See your GP or go to hospital if you have any breathing difficulties or chest pains, as we know that air pollution can worsen heart disease and lung disease.
"It is potentially serious, so don't take it too lightly.