Take it from somebody who had multiple "fire seasons" in the past few years here in the Bay Area: get an air purifier for your home, like now.
They might be sold out everywhere because you won't be the first one trying to get one right now but do it as soon as they get in stock.
You don't need a very expensive or a big one, depending on the size of your rooms, a cheaper one does plenty already and it WILL help. The last thing you want is having to sleep with a mask on because the air inside your bedroom is unbreathable.
Even outside of "fire makes air unbreathable" season an air purifier is really good to have in your place. It might run at the lower setting or not at all 90% of the time but you'll be happy to have it filter the air the rest of the time.
EDIT: I have been told to NOT get any "ionizing" filters for airpurifiers, as those produce ozone which, huh, you don't want in your home or anywhere near your lungs