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 ...

Naturally, people in the Los Angeles area are reaching for their phones to see what the Air Quality Index (AQI) says about ...

Poor air quality has been detected in multiple states surrounding California. The state has been hit with multiple deadly ...

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 ...

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

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 ...

The AQI is measured on a scale from 0 to 500, with the lower the number, the healthier the air. (Getty Creative) ...

Angelenos still bothered by the smell of smoke may be surprised to see that Air Quality Index numbers returned to “healthy” or “moderate” levels this week in L.A. County, but they shouldn ...

A total of six towns in Monmouth and Ocean counties have unhealthy air and ozone levels, according to AirNow.gov.

Tens of thousands of people have evacuated their homes and at least two have died in raging fires sweeping across Los Angeles County Wednesday. Multiple wildfires spread by strong Santa Ana winds ...