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 ...

As wildfires blaze in California, many are evacuating while firefighters work to extinguish the flames. Residents in and ...

Major air pollutants have declined in recent decades, but USA TODAY’s analysis shows wildfire smoke is taking their place.

AirNow is a collaborative effort of federal agencies that provides air quality data across the U.S. The site also has ...

Given morning allergy attacks and increasing environmental health concerns, it’s no wonder people are concerned about potential air quality problems in their homes. While an indoor air quality ...