Rare smog puts Sydney air quality on a par with New Delhi as bush fires rage

SYDNEY – Air quality in Sydney plummeted on Dec 19 to levels among the world's worst as smoke from bush fires in the north blanketed the harbour city.

It took large swathes into index ranges on a par with New Delhi, one of the world’s most polluted cities.

Although smog is rare in Sydney, better known for its beaches and blue skies, grey clouds hovered over the iconic Opera House and Harbour Bridge, with smoke visible in the air.

The air quality index hit 161 in areas just north of the city's downtown after 5pm (2pm Singapore time), reaching a level at which people are advised to avoid prolonged outdoor exercise.

But there could be relief in sight, with the Rural Fire Service (RFS) saying southerly winds should begin to dispel the smog by evening.

The smoke had drifted hundreds of kilometres south from fires burning across roughly 136,000ha, an area almost the size of Greater London, the RFS said.

Authorities have warned of a high-risk bush fire season in Australia this summer after two quiet seasons, compared with the 2019-2020 "Black Summer" fires that destroyed an area the size of Turkey and killed 33 people.

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Energy company Santos halted work on a gas project north-west of Sydney as a huge bush fire raged out of control in the Pilliga forest south of Narrabri, a town that is about 420km away.

"The fires in the Pilliga are of enormous concern," a company spokesperson said in a statement. "While there is no risk to, or because of, our facilities, we have shut in our operations for the time being."

In the Indian capital, where index levels range between 74 and 225, scientists recently planned to turn to cloud seeding to ameliorate matters.