Our favorite smart air purifier is currently 17 percent off
Engadget has been testing and reviewing consumer tech since 2004. Our stories may include affiliate links; if you buy something through a link, we may earn a commission. Read more about how we evaluate products . The Levoit Core 400S is the same price as it was during Amazon's Prime Day sale. It’s always a good time to invest in an air purifier , but in the summer, when seasonal allergies can force sufferers to keep the windows closed, they’re especially useful. And right now our favorite over