Indoor air can have up to five times the concentration of pollutants of outdoor air—and the seemingly harmless dust particles floating around your house can lead to irritated eyes, headaches, and other cold-like symptoms. Air purifiers are just one way you can rid your home of these irritants, and right now, you can get one of Amazon’s best-selling models for 36 percent off.

The Winix 5500-2 Air Purifier uses multiple filters to eliminate pollutants in a 360-square-foot room. The first layer is a washable mesh pre-filter that battles large particles. Then the carbon filter, which is also washable, cuts out VOCs (volatile organic compounds) and odors like smoke. Next, the True HEPA (high-efficiency particulate air) filter works to remove at least 99.97 percent of allergen particles as small as 0.3-microns in size, which is equal to 0.0003 millimeters. And according to the company, the PlasmaWave filter helps neutralize bacteria and viruses.

On the outside of the gadget, you’ll find an LED air quality gauge. If the quality depreciates, the indicator will change color and the auto mode will adjust the fan speed to improve it. When you turn out the lights, the Winix will go into sleep mode so that it can keep operating without disturbing your sleep.

The Winix has a 4.7-star rating after more than 18,000 reviews. One reviewer, who lives in a house with seven people, three dogs, and three cats, claimed that this air purifier helped the whole family stop coughing and alleviated his baby’s perpetually runny nose after just four days.

Each air purifier weighs 15.4 pounds and comes with a remote control, a year’s supply of filter replacements, and a two-year warranty. Learn more about this sale on Amazon.

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