The Levoit PlasmaPro Smart True HEPA Air Purifier completely refreshes air 5x per hour in a 403 sq ft space or 2x per hour in a 1,007 sq ft space, running with noise levels as low as 24dB. With 3-stage H13 True HEPA filtration, the air purifier filters 99.97% of airborne particles 0.3 microns in size and neutralizes household odors such as pet and kitchen smells. HEPASmart Technology filters 99.99% of bacteria and mold, as well as 99.9% of viruses, keeping your home fresh and healthy. PlasmaPro Technology releases negative and positive ions into the air, which then bind with contaminants and break them down into harmless matter. The laser dust sensor scans surrounding air for airborne particles and displays the amount detected on the PM2.5 display. With smart control, you can control air purifier settings no matter where you are, connect to third-party voice assistants, and receive real-time notifications about air quality and filter life.