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 ...

The Air Quality Index in Delhi dropped to 999 over the weekend, making it the most polluted capital city in the world. While the safe limit set by the World Health Organisation is 25, anything ...

Most of the world has dirty air, with just 17 per cent of cities globally meeting air pollution guidelines, a new report has found. Switzerland-based air quality monitoring database IQAir analysed ...

The EPA's network consistently failed to capture air quality in communities of color across six major pollutants. The monitors are the key data source driving decisions about pollution reduction, ...

Air quality changes consistently. Depending on the different pollutants in the air that come from natural and human activity, some days can be easier to breathe than others. Air quality indexes ...