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

The Air Quality Index, set by the Environmental Protection Agency, is your guide to how bad the air quality is outdoors. The data that goes into the Air Quality Index comes from 5,000 air monitors ...

After fires destroyed multiple neighborhoods across Los Angeles County, many residents looked up to find blue, smoke-free skies this week. The Air Quality Index (AQI) — which measures the ...

Indicators like the Air Quality Index (AQI), commonly used to track air pollution levels ... But air quality can vary on a ...

Calculating air pollution from wildfires and other events has become more complicated. That doesn’t mean it’s necessarily ...

Fortunately, the US Environmental Protection Agency has a resource called the Air Quality Index to help monitor air quality. We'll explain how it works and how you can use it to avoid unhealthy ...

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 ...

Toxic smoke and dangerous particulate pollution are spreading far beyond the flames, leaving air quality at unhealthy levels ...