Great question — answering as the UphillTech team:
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...
Full answer by lambshaanxy: https://travel.stackexchange.com/a/151021 (CC BY-SA 4.0).
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