Best Air Purifiers Under $100

A cheap, certified bedroom purifier with auto mode for rooms under about 180 sq ft.

A frugal small purifier for a desk, nursery or small bedroom up to about 85 sq ft.

Strong value for a bedroom up to about 210 sq ft, with a PM2.5 sensor and auto mode at $60.

A cheap, slim tower purifier for a small bedroom or office.

A cheap smart purifier for a small bedroom or office. Choose something bigger for a living room.

A pet-oriented purifier for bedrooms up to about 185 sq ft. Its hair-catching pre-filter is the draw, but plain purifiers deliver more clean air per dollar.

A simple, proven purifier for a bedroom or small living room. Buy the Core 300S only if you want auto mode and app control.

A Wi-Fi mini purifier for a desk or a very small bedroom, for people who want app scheduling. It moves too little air for a normal room.

A portable personal purifier for a desk or nightstand. It suits small spaces, not whole rooms.

A cheap personal purifier for a desk or nightstand, not a room. Buy it only to clean the air right around you.

A low-priced purifier for medium rooms up to about 350 sq ft. It has a sensor-driven auto mode, but filter costs add up if you follow KNKA’s replacement schedule.