The Levoit, and basically all 'consumer' purifiers, are extremely under-powered and generally have very low air clearance rates & CFM. Usually relatively/overly expensive filters, too.

To get a remotely apples-to-apples comparison, look at commercial air purification systems -- think devices intended for areas that allows indoor smoking, such as bars/casinos/smoking rooms/etc.

My experience was that a relatively modest 20x20 (x12' high) room requires a massive amount of air movement, and products actually designed for spaces of that size generally run $3-6k or more.

A Corsi-Rosenthal box can delivery very good PM2.5/PM10 numbers, even with challenging environments & when "stretched" to provide purification for an entire home.

PurpleAir or a similar quality AQ monitor provides some very objective data to guide you; I trashed my Levoit purifiers rapidly after realizing just how ineffective (and expensive) they were versus a CR box.