Warnings Issued As Smoke Blankets Sydney For A Second Day

Health warnings have been issued as NSW residents wake up to yet another smoky day as bushfires continue to burn in the state's north.

Air quality has hit 'hazardous' levels in parts of Sydney as the smoke from blazes burning on the mid-north coast continues to drift south.

Randwick, Rozelle, Chullora, Earlwood and Macquarie Park are among the suburbs with the worst air quality, according to the Department of Environment.

Parts of the Hunter and the Central Coast are also copping heavy haze with levels expected to hit 'hazardous' today.

The air quality for the rest of Sydney is forecast to remain 'poor' due to particles.

NSW Health’s director of environmental health Richard Broome said it's important asthma sufferers and those with chronic respiratory or heart conditions are being urged to stay indoors with the windows and doors closed, if possible.

"If you have symptoms take your normal relieving medications, get out of the smoke if you can and if symptoms don't improve, seek medical advice.

"In the case of an emergency, call 000," he told 10 daily.

The smoke isn't expected to clear off for at least another 24 hours as strong winds continue to push the haze south.

"What we will see is a thinning out of the smoke haze [in Sydney] during the later afternoon but it may return this evening and linger into tomorrow morning," Bureau of Meteorology Duty Forecaster Jordan Notara told 10 daily.

As of 5pm Wednesday night there were 72 bushfires burning across NSW; 38 were still uncontained. All are burning at an advice level.

Smoke from blazes burning across 2500 hectares near Port Macquarie is being pushed as far as Nowra on the state's South Coast.

Firefighters trying to contain a blaze. Image: AAP Photos.

Firies are also on high alert in South Australia today with Adelaide expected to reach 36 degrees, Ceduna 41.

There are fire bans across eight separate districts.

Victoria is also in for a warm day with Melbourne forecast to reach 35 degrees.

In good news for drought-ravaged Queensland, rain is expected to continue to fall.

After months with barely a drop, parts of the state's centre have copped up yo 70 mm since Tuesday.

The town of Blackall, southwest of Longreach had 66 mm on Tuesday night and into Wednesday, while the upper Claude River recorded 50mm.