Between the lines: AQI wasn't set up to monitor ash falling from the sky. Even if you see a low AQI score, "it could be downwind from a burn area and experience a lot of ash, and that won't show ...

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 ...

Despite the improvement in air quality, experts have warned that particulate matter pollution still exceeds the National ...