Levoit PlasmaPro 600S-P Smart True HEPA Air Purifier

The Levoit PlasmaPro 600S-P is a smart air purifier for larger spaces such as living rooms, open-plan areas, apartments and lofts. Levoit rates it to refresh the air five times an hour in a 635 sq ft room, or twice an hour in up to 1,588 sq ft, with a CADR of 410.

It pairs a 3-stage filter (pre-filter, H13 True HEPA and activated carbon) with Levoit's PlasmaPro technology, which releases positive and negative ions that bind with airborne pollutants. The HEPA stage is rated to filter at least 99.97% of airborne particles 0.3 microns in size, and the carbon layer targets household odors. Note that the PlasmaPro function produces some ozone.

You get four fan speeds (low, medium, high and turbo) plus Auto and Sleep modes, guided by a built-in air quality sensor. The app lets you change settings and get real-time alerts about air quality and filter life, and it works with Amazon Alexa. It also has a touchscreen display, timer and nightlight, runs as quietly as 26 dB, draws 49 watts, and is ENERGY STAR certified and AHAM Verifide.