Syndey has been blanketed in smoke for three days, sparking warnings for people to keep children indoors.
The unrelenting conditions have sharpened attention on the climate change policies of Prime Minister Scott Morrison, who rejected any link.
As extra folks within the southeast of the nation have been informed to evacuate their properties and schoolchildren in Sydney have been once more compelled to play indoors, Morrison dismissed mounting requires motion.
Another hot and unsafe day is forecast for Thursday, with windy conditions moving further east. Scientists consider lots of these elements are made worse by rising world temperatures.
Australia has been battling wildfires on a number of fronts for several days, with the fires endangering thousands of people in many areas.
Growing calls to curb fossil fuels and drastically cut greenhouse gas emissions are being ignored by the country's conservative government, which is eager to protect its lucrative mining industry. The fires have intensified the debate about the impact of global warming in Australia, already the world's driest-inhabited continent with an economy underpinned by resources exports including coal.
Devastating fires alongside the nation's east coast have claimed six lives since mid-October.
It is the first time in a decade Victoria has been declared Code Red, with the highest possible fire risk and a statewide total fire ban.
Nation Hearth Authority chief Steve Warrington earlier informed folks dwelling in high-risk rural areas to depart for the security of cities.
"Hopefully, once we turn the corner on today there'll be an easing of conditions more broadly across the state", he said.
Firefighters have followed the crisis across four states as extreme temperatures and high winds sparked wildfires in new areas, even as they struggle contain existing fires.
As blazes that scorched swathes of countryside continued to spread and the country's largest city was cloaked in hazardous smoke, Morrison defended his climate record and said Australia was "doing our bit".
Firefighters are continuing to battle almost 200 bushfires across eastern Australia, while authorities have issued a Code Red alert for parts of Victoria State.