Please see our air cleaner/filter buying guide.
Also these tweets are two excellent sources – both from Indoor Air Quality Experts.
This is Dr. Shelly Miller – who authored this tweet – and co-authored the tools she mentions here.
This is Marwa Zaatari, who regularly helps decipher the complex air cleaner market to get you the best bang for your buck. Her pinned tweet is the best place to find an amazing graphical way of finding a great air cleaner.