If you can't find any HEPA filters, MERV 13 or greater will also filter out smoke particles very well. Not all HVAC systems can handle them but you can always tape a cube of them together with a box fan. I'm near Spokane which is currently burning down and the air quality is abysmal, stay safe
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you can make an at home air filter for relatively cheap. Or buy one off of Amazon (linking the one I have) www.epa.gov/sciencematte... LEVOIT Air Purifier for Home... www.amazon.com/dp/B07VVK39F7