Most of Minnesota woke up Saturday under an air quality alert that will last through Sunday night, as the Minnesota Pollution Control Agency warned that a perfect combination of sunshine, warmth and low humidity is producing ground-level ozone at levels unhealthy for millions of residents across the state.
An Alert That Covers Nearly the Whole State
The MPCA issued the Air Quality Alert starting at noon Saturday, June 6 and running until 11 PM CDT Sunday. The alert covers southern, central and western Minnesota — encompassing the Twin Cities metro area, St. Cloud, Brainerd, Alexandria, Rochester, Mankato, Moorhead, East Grand Forks, Winona and dozens of smaller communities across more than 60 counties.
The alert also includes the Tribal Nations of Mille Lacs, Prairie Island, Upper Sioux, Leech Lake and White Earth. The Air Quality Index is expected to reach the Orange category — Unhealthy for Sensitive Groups — Saturday and Sunday afternoons, when ozone concentrations typically peak.
Why the Air Is Bad This Weekend
The MPCA explained the chemistry driving the alert in the bulletin itself. Ground-level ozone forms when two pollutants already present in the air — volatile organic compounds (VOCs) from vehicles, industry and consumer products, and nitrogen oxides from combustion — react with sunlight under warm, dry conditions. Mostly sunny skies, warm temperatures and low humidity this weekend are providing exactly that recipe.
Ozone levels are expected to ease after sunset Saturday, stay lower Sunday morning, then climb again Sunday afternoon as the sun strengthens and temperatures rise. The safest window for outdoor activity is early morning on both days.
“We want to give people the information they need to make smart choices — whether it’s rescheduling a run, protecting a child with asthma, or delaying the backyard chores,” said MPCA Meteorologist Matt Taraldsen, in the agency’s 2026 summer forecast. “This summer, conditions are lining up for several air quality alert days, so staying ‘air-aware’ is more important than ever.”
Who Is at Risk
Ozone irritates the airways and can worsen chronic lung conditions. People most vulnerable include those with asthma, emphysema, COPD or chronic bronchitis; children and teenagers; older adults; and anyone doing strenuous outdoor activity such as running, cycling or manual labor. Even some healthy people carry a genetic sensitivity to ozone and may experience symptoms at lower concentrations.
Health effects from elevated ozone can include shortness of breath, chest tightness, throat irritation, wheezing, coughing and unusual fatigue. According to KAAL-TV coverage, people with asthma should carry their relief or rescue inhaler and follow their asthma action plan throughout the weekend. Anyone experiencing symptoms should contact a healthcare provider.
How Minnesotans Can Help and Stay Safe
The MPCA asked residents to reduce emissions on high-ozone days: limit vehicle trips, use public transit or carpool, avoid idling, fill gas tanks at dawn or dusk rather than midday, delay gasoline-powered lawn and garden equipment, and avoid backyard fires or outdoor burning.
This weekend’s alert is part of a pattern the MPCA flagged in its summer outlook published in May. The agency predicted four to six days of unhealthy ozone levels for sensitive groups in 2026, driven by warmer, drier conditions. Drought and below-normal rainfall mean more sunny days — and more ozone-forming potential. The forecast noted conditions similar to 2024, when Olmsted County earned an “F” grade for ozone pollution in the American Lung Association’s State of the Air report.
Track real-time conditions and sign up for daily alerts through the MPCA Air Quality Index page or the EPA’s free AirNow mobile app.
