The MPCA says that sensitive groups should avoid prolonged or heavy exertion, and everyone should limit their time spent outdoors.

At the Minnesota Pollution Control Agency (MPCA), most of Minnesota was classified as having “moderate” air quality late Sunday morning, with areas around Marshall, Moorhead and Hibbing being a potential risk for people with breathing sensitivity. An air quality alert for Minnesota through Monday issued by the MPCA remains in effect.

Every air quality monitor in Minnesota is reporting red or unhealthy conditions for everyone, an official said.