They usually take us by surprise.
In the span of just hours it'll go from this:
Just enough to make you itchy and your eyes dry. Just enough to bring all that fine dust in the air into your house no matter how much you try and seal up everything.
Just enough to dirty your white car which you JUST CLEANED YESTERDAY.
At least it wasn't coupled with the smokey smell of bushland fires; that came later in the week.