If you have been hearing about poor air quality in New York City Friday, you can breathe a deep sigh of relief (literally): ...

One possible reason for bad air quality in the city is a fire that broke out yesterday afternoon in Lancaster, Pennsylvania, ...

Blowing dust may result in air quality index levels that are unhealthy for sensitive groups or worse. The winds may disperse ...

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 has improved in the LA region as firefighters get blazes under control, but there are questions about how safe the ...

It comprises two measures: the number of days with an air quality index below a certain threshold and the number of violation points against drinking water systems in each state. Learn more about ...