Definition of air purifier
: a device that removes contaminating particles (such as dust, pollen, and dander) from the air Air purifiers that draw air through fabric filters are among those that do the best job of removing dust and smoke from the air without producing any ozone. — Consumer Reports, December 2007 Ionic air purifiers work roughly the same way, with negative ions attaching to smoke and dust particles that are, in turn, attracted to positively charged plates and filters.— Paul Chavez, Pittsburgh Tribune Review, 14 Apr. 2008
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