Sydneysiders are facing another smoky day as the haze from fires in northern NSW causes poor air quality in parts of the region.

The Department of Environment’s air quality index showed parts of the lower Hunter, upper Hunter, Central Coast and Sydney’s east were rated as “hazardous” on Wednesday evening for visibility or particles.

Within Sydney, Randwick, Rozelle, Chullora, Earlwood and Macquarie Park were given a hazardous rating.

The department has forecast air quality in Sydney for Thursday as “poor” due to particles, warning it is unhealthy for sensitive people and could cause symptoms, especially those with heart or lung disease.

Smoke from intensifying fire conditions on the state’s mid-north coast and the Hunter region has been dragged down towards parts of the Central Coast, a Bureau of Meteorology spokesman said.

“We have seen quite extensive areas of smoke haze that are being pushed throughout the state in the east,” he told AAP on Wednesday.

Smoke haze from fires near Port Macquarie has been pushed down over parts of Sydney and as far as Bowral, he said.

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Fires over the western part of the divide have been pushed down to Wagga Wagga.

Northerly winds will continue into at least Thursday with the potential to bring more smoke over the affected areas, the spokesman said.

A bushfire which continues to burn in the area of Lake Innes and Lake Cathie, south of Port Macquarie has burned more than 2425 hectares, including an important koala breeding ground.

On Wednesday evening the fire, which has been burning since Saturday, had been downgraded to advice level.

NSW Rural Fire Service spokesman Greg Allan told AAP crews will continue working towards containing the fire.

While there are no total fire bans in place for Thursday the greater Hunter, greater Sydney, Illawarra/Shoalhaven, far South Coast, Southern Ranges and Central Ranges areas are under very high fire danger.

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AAP