That "HEPA" label on your air purifier might not mean what you think it does, and the difference actually matters.

Air purifiers use filters to trap airborne irritants like pollution, allergens, and smoke. The best purifiers have HEPA filters and a carbon filtration system to also trap odors. When choosing a ...

Since I first started reviewing air purifiers for WIRED in 2018, I’ve tested dozens and dozens of the health-protecting appliances, usually for months at a time. I started out looking into how to ...