Air quality is expected to reach hazardous levels in some suburbs across Sydney today as bushfires continue to burn across the state.

The smoke haze is set to continue while the bushfires are still burning and a poor air quality alert has been issued.

This marks the longest period of air pollution on record in NSW with the BOM predicting that the heavy smoke will linger in the city basin until at least Saturday.

A total fire ban is also in place for numerous locations across NSW today due to widespread Severe and Very High fire dangers.

The RFS have said that under the conditions predicted for today, fire’s will spread quickly, and so everyone should have a bush fire survival plan in place.

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Firefighters have faced a long night battling blazes stretching from the NSW south coast all the way to the Queensland border, ahead of yet another day of severe fire danger in parts of the state.

Emergency warnings were at one stage issued for seven bushfires burning in NSW on Thursday, with fires still threatening a number of communities across the state as night fell.

At 9pm the Currowan fire north of Batemans Bay, the Three Mile blaze and the Gospers Mountain fire close to Sydney, the Green Wattle Creek fire near Warragamba Dam and the Little L Complex Fire were all still classed as emergency warning fires.

“It’s going to be a really long night for a lot of communities and the firefighters in those areas,” Deputy Commissioner Rob Rogers told the ABC

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“I think the really difficult thing is the amount of fire people have seen since the beginning of August how much fire we’ve had in the northern part of NSW – well we’ve just replicated that in the central part of the state as well as still having the north going so it’s quite extraordinary conditions.”

There were 117 bushfires, with 60 not contained on Thursday evening.

More than 2000 firefighters remain in the field battling the blazes.

Almost the entire coastal area of NSW and much of the state’s northeast have a severe fire danger rating for Friday.

With AAP.