Finding myself in a similar situation with last years fires, I have had great luck with the WINIX air filters sold at costco. I bought 2 on sale for $100/ea.

Finding myself in a similar situation with last years fires, I have had great luck with the WINIX air filters sold at costco. I bought 2 on sale for $100/ea. They are 5 staged with HEPA and charcoal filters, have a built-in air quality monitor of unknown quality (I should open one up one of these days), and they have an ok app that allows you to check air quality and adjust their settings. Each unit includes 2 years of filters, and they look to be about $30/year/unit to replace after that.