The Air Quality Index (AQI) is a national system developed by the U.S. Environmental Protection Agency (EPA) to translate various air pollutant concentrations into a single, easy-to-understand number.

You may have noticed some haze in the sky, as well as a cherry red sunrise this morning. Here's what to know about air ...

Air quality advisories have been issued for parts of Michigan, Illinois, Indiana, Minnesota, New York, Vermont and Colorado on Tuesday.

The alert comes as humidity is expected to increase Tuesday, with high temperatures in the mid 80s to low 90s, with heat indices reaching 100 by Wednesday.

As winds shift back out of the south, the Canadian wildfire smoke blanketing the metro is expected to improve throughout the ...

An air quality alert is in effect for all of Minnesota from Saturday through 9 a.m. Monday because of Canadian wildfire smoke.

An air quality alert is in place for the entire state of Minnesota through 9 a.m. Monday. Northern Minnesota falls in the very unhealthy AQI category.

The winning numbers in Monday evening’s drawing of the "Ohio Pick 4 Evening" game were: ...

Sunny start to Sunday, but storms return by evening. Rain and thunderstorms likely all week. Air Quality Alert in effect ...

After a few days of jubilant fireworks launching, Columbus' air quality is taking a hit, causing the Mid-Ohio Planning ...

Air Quality Alert issued for Saturday in central Ohio due to wildfire smoke and fireworks. Sensitive groups advised to limit ...