We've hand-tested multiple models for our air purifier buying guide, and Coway's have been a consistent favorite. WIRED Featured Deals:Coway Airmega Mighty Air Purifier for $170 ($60 off)The best affordable air purifier offers excellent value for the price, even when it's not on sale. We like this purifier's color-coded light, which shows blue for clean air and purple or red for different levels of pollutants based on its built-in air sensor. Coway Airmega ProX Air Purifier for $720 ($279 off)This big ol’ air purifier is the most effective option we tested for homes with high ceilings. Coway Airmega 50 Air Purifier for $63 ($17 off)This tabletop model received an honorable mention in our air purifier buying guide—also see our in-depth review here—but it's still a decent pick for small spaces.