I just realized I have some expertise here that might help if you have questions you need answered. I was a breaking news reporter for a billion years and around here that means covering a lot of wildfires up close and personal (without proper gear, but I digress.) As a highly curious environmental and indigenous rights reporter I learned a lot of fire science as well. If you have questions about how to deal with an ugly fire season I can try to answer them as best as I can.

Also those Corsi-Rosenthal boxes are supposed to be excellent but I haven't tried them out. I do use air filters when things get exceptionally bad, and humidifiers can help too, at least around here where humidity can get so low that it sucks all the moisture out of your eyes and nose

@brooklynmarie As someone in Washington, I can personally attest to the value of a Corsi-Rosenthal Box. The 4-filter version with a box fan on top will clean more air per minute than any consumer HEPA air purifier from Amazon or WalMart.
The best filters are Filtrete 1900 from Amazon, Target, WalMart, Lowes, etc. 20" wide is needed to form a box that fits a box fan on top, but any height works; 30" will give you the longest lasting filters.
Here are video & photo guides:
https://www.youtube.com/watch?v=aw7fUMhNov8