I Want To Buy An Air Purifier – Any Suggestions?

I recently moved into an older house. It does not have central air. Just ceiling mounted fans, radiators, and window AC units. I am noticing a large amount of dust accumulating. On campus there is a meditation room. The air there smells great, I believe it is ionized. Do you have any suggestions or recomendationgs for an (ionic?) air purifier?

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