Maybe you could even use it in conjunction with something like a laser particulate sensor, to scope how effective it is and track its progress from day to day. Kick it on when it detects a nasty bunch of filth in the air, and kill it once it reaches a set acceptable level.

https://hackaday.com/2018/10/09/hacking-the-zh03b-laser-part...

This one only goes down to one micron though, so it might not be usable for many allergens.