Breathable is a newly free app by the Portland-based app development agency Karbon that adds an Air Quality Index (AQI) ...

This measure, based on data from the Environmental Protection Agency, evaluates states on the number of days the Air Quality Index in counties was not rated “good.” U.S. News calculated a ...

Your Apple Watch includes a complication called AQI, which reports on the Air Quality Index for your location. It's easy to add this complication to many watch faces, so you can keep tabs on the ...