score:12
TL;DR, I wouldn't worry too much.
Sydney is on the coast and usually has very good air, because wind is frequently blowing in from the ocean, pushing away any bushfire smoke. The recent bushfires made the news worldwide precisely because it's so rare for them to affect Sydney that badly and that long.
The further out (west) of the city you go, the higher the likelihood of bushfires and haze. The Blue Mountains are fairly frequently affected, and on rare occasions even the Hume Highway to Canberra/Melbourne can be closed because of fires. But the vast majority of Sydney's attractions (Sydney Harbour, Opera House, Bondi, Manly etc) are all very central and unlikely to be impacted. The airport is also very close to the city, and even in the event of runway closures, long-haul international flights have priority.
Upvote:2
My nephew moved to Sydney in Sept. The air quality is also VERY poor. They stay inside... people wear masks... Avoid traveling there.
Upvote:2
Postpone if you can.....fires are very unpredictable at this time with extreme heat and wind changes....surely you can pick a better time.....Autumn is always lovely here btw! Very smokey here tonight because of Blue Mountain fires getting worse!
Upvote:5
If you plan to travel far throughout NSW by driving, you should be prepared for unexpected road closures.
There is a chance of extremely poor air quality.
Other than that, it is safe to travel.