The Michigan Department of Environment, Great Lakes, and Energy (EGLE) has issued an Air Quality Alert for coastal Michigan counties Thursday.

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An air quality warning was issued for the Kansas City area, the first ozone alert of the summer and the first alert to be issued this late in the season, according to the Mid-America Regional Council.

The Minnesota Pollution Control Agency issued an air quality alert for the southern half of the state Tuesday due to "ground-level ozone." Here's what that means.

While the ozone layer at high levels of the atmosphere protects people on Earth from the sun's harmful radiation, ozone pollution at ground level is unhealthy to breathe.

An "Ozone Action Day Alert" will remain in place until 4:00 p.m. on Monday, as ground-level ozone gas is expected to reach unhealthy levels for some residents.