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 ...

Specialized air quality instruments captured a spike in lead, chlorine, and bromine pollution during the L.A. wildfires.

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, provide a rough sense of the ...

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

The air quality in many parts of the country has reached unhealthy levels, particularly in cities, according to the real-time ...