Our 11 Favorite Air Quality Monitors We’ve Tried (2025)
In the past five years, I’ve tested dozens of indoor air-quality monitors but have relied on my iPhone’s Weather app to check outdoor air quality. On questionable days that might include haze or the smell of wildfire, I’ll check the government’s free AirNow website, where I’ll plug in my zip code and see its easy-to-read air quality meter. With the increasing wildfire activity from coast to coast, however, I realized it was time to test an outdoor air-quality monitor. The Zen is larger than the