Smoke from bushfires blanket Sydney.
Air quality has plummeted to "hazardous" levels in Sydney's north-west, with fine particles in some suburbs rising from 200 to more than 300 on the air quality index - where "good" air quality is rated below 66.
An image taken on a smartphone from a plane window shows smoke haze blanketing Sydney on, November 19, 2019.
"Western Sydney has been particularly heavily affected as a result of the proximity to the bushfire burning just north of Sydney", NSW Ambulance Superintendent Jordan Emery told the Australian Broadcasting Corporation.
Health experts have warned residents with medical conditions to remain indoors as smog from a large fire from a mountain north of the city saw the air quality plummet to the lowest in the world.
Sydney's air quality is now worse than that of notoriously polluted cities such as Bangkok, Shanghai and Chengdu.
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A few hours later, Israeli aircraft struck a number of terrorist outposts belonging to Hamas , the Islamist group that rules Gaza. The Israeli occupation hit the house of the family while they were asleep early on Thursday, according to media reports .
More than 110 fires are now burning across Australia's east, with dozens of the blazes still uncontained.
"It's fair to say all of these fires have got the potential to present real challenges today", Rural Fire Service NSW Chief Commissioner Shane Fitzsimmons said on Tuesday.
Residents were advised not to exercise outdoors, and those with conditions such as asthma, emphysema and angina to avoid being outdoors all together.
Australia is prone to wildfires during its dry, hot summers, but fierce blazes have been sparked early, in the southern spring, by a long drought and soaring temperatures.
Powerful winds fanned around 130 fires that have been burning across New South Wales and Queensland states for several days, and pushed smoke south to form a thick haze over Sydney, home to around five million people.
Air quality was hazardous in the Northern Tablelands and the northwest slopes on Tuesday and poor in the Hunter region, the Central Coast and Illawarra.