The 13 Best Amazon Air Purifiers — Starting at $40

Blueair Blue Pure 211+ Air Purifier ($320)

You almost won't believe the mighty power this air purifier holds. The three-part filtration system can capture 99 percent of airborne pollutants, such as pet dander, allergens, odors, smoke, mold spores, and dust mites. This size is designed for medium rooms, ranging between 400 to 600 square feet. It can clean a 540-square-foot room in 12 and a half minutes or up to 2,592 square feet in about an hour. One of the 10,000 five-star reviewers deemed it "simple, quiet, and powerful."