Sydney was blanketed in smoke on Thursday as bushfires continue to burn across eastern and southern Australia.
Health officials issued warnings as air quality levels passed 'hazardous' and some residents wore face masks.
The city has been shrouded in smoke since Tuesday, 7 News Australia reported, and it is expected to linger through the weekend.
There are currently 50 bushfires burning across the country and more than 600 homes have been destroyed.
Residents of Mildura, northwestern Victoria were also blanketed by a thick fog, this time from a massive dust storm.
The town turned orange on Thursday as winds rose and temperatures climbed to 40C.
Pictures uploaded to social media show the thick orange and red fog blanketing the town and visibility is reduced.
One local said the sky had an orange hue similar to bushfire smoke.
"The sun was trying to come through but it can't, and you just get an orange glow. You get grit in your eyes, in your mouth," Sara White told The Guardian Australia.
"It's something that we are getting quite used to over here and it's not something I would prefer we get used to," she said.
The regular dust storms are caused by droughts.
A fire ban and a code red, Victoria's highest bushfire warning, was issued for the central and northwestern regions on Thursday.