You could try RVAir.com. These are just very good filters that go into your AC units. They work really well, and may fix your problem.
We were in Idana, OR, for about two weeks, for the total eclipse, and the smoke was pretty bad. We kept the coach pretty much closed up. The smell was not too bad, and cleared up pretty well when we left.
Once you use them, you will not go back to the cheap foam type.
Tom
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TLGPE (RVM28)
Retired engineer working full time to keep our coach (05 KSDP 3910) operating.
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