Air purifiers are fundamentally simple machines—little more than a fan and a filter. Yet a well-designed purifier can capture virtually all airborne allergens, such as pollen and mold spores, as well as bacteria, viruses, and smoke. We've tested more than 60 air purifiers in the past nine years, and the exceptional Coway Airmega AP-1512HH Mighty is our top pick among them. It's powerful enough to clean a large room, quiet enough to sleep near, engineered to run for years, and inexpensive enough to set up several throughout a home. But it's not the only excellent air purifier we've found, and if you prefer the looks, price, or features of our other recommendations, be assured that they are also top-notch performers. Our pick Perfect for bedrooms, playrooms, and living rooms, this purifier is one of the highest-performing, most-durable, and most-economical models we've tested. Buying Options Within 30 minutes, the Coway Airmega AP-1512HH Mighty reduced heavy smoke pol...