In my downstairs lounge I used a
"Living Air classic" EcoQuest https://ecoquestpurifiers.com/info/technology/
Purifier Ozone Ionizer Lots on ebay and some dif models also. (make sure it comes with the plates) I had it in the room and ran it 24/7 Smells like it does just after a thunder rain storm.
You could also go with
Ozone Generator Air Purifier
Let it run per instructions with the room sealed and then air out the room. Most run 60 min on auto then shut off and after 30 min to hour it is safe to re-enter.