The smoke is from the 330 hectare Lindfield Park Road fire, which started on Thursday, July 18.

Rural Fire Service's district officer Stuart Robb says crews are continuing to work on bringing the fire under control.

"The crews are working toward having the Lindfield Park Road fire controlled today (Sunday)," he said.

"There will be smoke in the vicinity and as we move into the afternoon and evening the inversion will increase the level of smoke across the area.

"Motorists should take care when driving and drive to the conditions."

Mr Robb also urged people with health issues to seek treatment.

The fire is being fuelled by stands of paperbark and mealeuca trees with pockets continuing to burn.

Crews are working to secure the western edges of the fire.

No properties are directly at threat however, wildlife are at risk, said Mr Robb.

"The fire has impacted some environmental corridors. This area is a koala habitat and it has been impacted.

"This fire is under investigation with the cause undetermined at this point."

Fire and Rescue NSW has five appliances on site with a further eight appliances from across the RFS network at the scene.

"An incident management team is also working on the fire throughout Sunday," he added.

An RFS drone is also likely to be used as part of the fire fighting arsenal.

The drone features infrared and video technology which will allow fire fighters to identify hot spots and fire edges in bushland.

"The advantage of the drone is that it can be used where there is limited visibility or limited access," Mr Robb said.

A private hazard reduction burn on Riverside Drive was contained on Saturday evening and will be patrolled through Sunday and possibly Monday.

Mr Robb said there is also likely to be internal burning and smoke from this fire but there is no threat to property.

RFS crews are also working on a bushfire on Grey Gum Ridge Road at Middle Brother.

That fire is currently listed out of control but Mr Robb said crews were likely to have that fire under control quickly.

No property is threatened by this fire.

Read more:

Forestry NSW is undertaking a hazard reduction burn south of Wauchope.

Mr Robb urged residents to revisit their bushfire survival plan.

"The drier and warmer conditions throughout July means that residents need to take extra care," he said.

"We urge you to make sure your bushfire survival plan is up to date and that there is a discussion on what families would do in the advent of a fire impacting them.

"There is plenty of good information on the rural fire service website, www.rfs.nsw.gov.au"

The North Coast Public Health Unit says people need to consider their health while smoke from a bushfire at Port Macquarie is affecting air quality across parts of the North Coast.

Fine smoke particles are known to affect the human breathing system. The smaller or finer the particles, the deeper they go into the lungs.

These particles can cause a variety of health problems, such as itchy or burning eyes, throat irritation, runny nose and illnesses such as bronchitis.

The smoke particles can also aggravate existing lung conditions, such as chronic bronchitis, emphysema and asthma.

Smoke particle levels are likely to be higher outdoors than indoors, so people sensitive to fine particles should limit the time they spend outside.

People with asthma and other lung conditions should not engage in vigorous exercise and, if possible, they should stay in air-conditioned premises where filtration systems can help to reduce smoke particles in the air.

Symptoms can occur for several days after smoke is inhaled, so people with the chronic respiratory conditions need to be vigilant with their treatment programs.

If you have asthma or a lung condition and you develop symptoms such as shortness of breath, coughing or wheezing, follow your Asthma or Chronic Obstructive Pulmonary Disease (COPD) Action Plan.

If symptoms do not settle, seek medical advice. If you are on home oxygen treatment, continue as prescribed and if breathlessness worsens, contact your doctor.

Healthy adults may also feel the effects of fine particles that can irritate the lungs, so it's wise to reschedule or cut back on prolonged or strenuous outdoor activities when smoke levels are high. Healthy adults generally find that symptoms will clear after the smoke disappears.

In case of emergency always remember to dial triple-0.

For more information, visit the NSW Health air quality web page.

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