In the bad smoke areas the local advice is to get a furnace filter and tape it to a box fan. I've had several reports that they turn brown in a day, so they must be catching something. For the most part, stores are all sold out of the filters. If you're not in one of the high smoke areas you might not understand how bad it is. Outdoors has been a no-breathing-zone for about a week now. It feels to me like spending a day outside without a mask would kill me. An AQI reading over 200 is classified as "hazardous". Much of Oregon has been over 500 for several days, sometimes in the 700s.
