The best air purifier for 2025

We’ve tested more than a dozen air purifiers that range from $120 to $1,200 — but the most effective method for getting the green light from our air quality monitors is completely free: opening the windows. Of course, seasonal allergies, frightful weather and wildfires can all conspire to make open windows impossible. Air purifiers are your second best option. With sound-muffled fans and multi-layered filters, these simple machines can clear up odors, cooking emissions, dust particles, smoke, pet…