Learn what the air quality index (AQI) means, how it impacts your health, and how to stay safe when pollution is high.

For people living near wildfires in the Los Angeles area, understanding the air quality index (AQI) charts can help you determine if you can safely workout, while outside. The AQI scale ranges ...

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, or AQI, is the primary system used to warn the public when air pollution is dangerous. It’s based on data collected from 5,000 air monitors across the country. The index ranges ...

See Air Quality Index for more information regarding Air Quality Index values ... Green indicates values in the "good" range; yellow in the "moderate" range; orange in the "unhealthy for sensitive ...