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The Minnesota Pollution Control Agency has issued an air quality alert for all of Minnesota. The alert started at 11 p.m. Saturday and runs until 11 p.m. on Sunday. The affected area includes the Twin Cities metro, Brainerd, Alexandria, Albert Lea, Marshall, Worthington, Rochester, Hinckley, St. Cloud, Winona, Ortonville, Mankato, Bemidji, East Grand Forks, Moorhead, International Falls, Two Harbors, Hibbing, Ely, Duluth, Roseau and the Tribal Nations of Upper Sioux, Mille Lacs, Prairie Island, Leech Lake, Red Lake, Grand Portage and Fond du Lac.

According to a press release, heavy surface Canadian wildfire smoke was expected to follow a cold front into and across Minnesota from west to east from late Saturday night into Sunday morning and afternoon, and then clear out from west to east across the state from Sunday afternoon through Sunday evening.

Some areas may only see a few hours of alert-level smoke concentrations due to the relatively fast movement of the north-south band of smoke. The air quality alert may need to be extended into Monday if an additional batch of heavy smoke materializes from Manitoba and Saskatchewan wildfires and is transported into and across Minnesota from north to south, but confidence for this outcome is currently low to medium.

Fine particle levels are expected to reach the orange air quality index category, a level considered unhealthy for sensitive groups, across west central, east central, central, south central, southwest, southeast, north central, northwest and northeast Minnesota. This area includes the Twin Cities metro, Brainerd, Alexandria, Albert Lea, Marshall, Worthington, Rochester, Hinckley, St. Cloud, Winona, Ortonville, Mankato, Bemidji, East Grand Forks, Moorhead, International Falls, Two Harbors, Hibbing, Ely, Duluth, Roseau and the Tribal Nations of Upper Sioux, Mille Lacs, Prairie Island, Leech Lake, Red Lake, Grand Portage and Fond du Lac. In the orange area, sensitive groups should limit prolonged or heavy exertion and time spent outdoors.

What this alert means

Air moves long distances and carries pollutants. During air quality alerts due to wildfires, the air is mixed with harmful smoke. Wildfire smoke spreads or lingers depending on the size of the fires, the wind, and the weather.

The air quality index (AQI) is color-coded. Air quality alerts are issued when the AQI is forecast to reach an unhealthy level, which includes forecasts in the orange, red, purple, and maroon categories. For a full description of each air quality category, visit airnow.gov.

Orange air quality: Unhealthy for sensitive groups

Sights and smells: In areas where air quality is in the orange AQI category due to wildfires, the sky may look hazy and residents may smell smoke even when wildfires are far away.

Health effects: This air is unhealthy for sensitive groups and pollution may aggravate heart and lung disease as well as cardiovascular and respiratory conditions. Symptoms may include chest pain, shortness of breath, wheezing, coughing and fatigue.

What to do: People in sensitive groups are encouraged to reduce outdoor physical activities, take more breaks or do less intense activities to reduce their exposure. People with asthma should follow their asthma action plan and keep their rescue inhaler nearby.

Who’s most at risk

Poor air quality impacts health. Fine particle pollution from wildfire smoke can irritate eyes, nose and throat, and cause coughing, chest tightness, shortness of breath, dizziness or fatigue. Smoke particles are small enough that they can be breathed deeply into lungs and enter the bloodstream. This can lead to illnesses such as bronchitis or aggravate existing chronic heart and lung diseases, triggering heart palpitations, asthma attacks, heart attacks and strokes.

Certain groups experience health effects from unhealthy air quality sooner than others, either because they are more sensitive to fine particle pollution or because they are exposed to larger amounts of it.

Sensitive groups include:

• People who have asthma or other breathing conditions like chronic obstructive pulmonary disease (COPD).
• People who have heart disease, high blood pressure or diabetes.
• Pregnant people.
• Children and older adults.

People with increased exposure include:

• People of all ages who do longer or more vigorous physical activity outdoors.
• People who work outdoors, especially workers who do heavy manual labor.
• People who exercise or play sports outdoors, including children.
• People who don’t have air conditioning and need to keep windows open to stay cool.
• People in housing not tight enough to keep unhealthy air out, or who do not have permanent shelter.

Anyone experiencing health effects related to poor air quality should contact their health care provider. Those with severe symptoms, chest pain, trouble breathing or who fear they may be experiencing a heart attack or stroke should call 911 immediately.

Take precautions

Reduce or eliminate activities that contribute to air pollution, such as outdoor burning, and use of residential wood burning devices. Reduce vehicle trips and vehicle idling as much as possible.

Stay informed

• Visit MPCA’s Air Quality Index webpage for information on current air quality conditions in your area.
• Sign up for daily air quality forecasts and alert notifications though EnviroFlash.
• Download the EPA AirNow mobile app from the Apple App Store or the Google Play Store.
• Visit the MPCA’s Air quality and health webpage for information about health and indoor and outdoor air quality and how to prevent air pollution.
• Visit the Minnesota Department of Health wildfire smoke webpage for actions you can take to protect your health against wildfire smoke.