Smoke is expected to cause red/unhealthy air quality index (AQI) concentrations, affecting everyone in the state. Sensitive groups, including those with asthma, heart conditions, pregnant women, children, and the elderly, are advised to avoid prolonged outdoor activities. Everyone should limit outdoor exertion.

Air quality alerts were in effect in Iowa, Minnesota, Wisconsin and Michigan, as well as eastern Nebraska and parts of Indiana and Illinois. Forecasters said the smoky skies would remain for much of the day. Canadian environmental officials said smoke from the forest fires would persist into Sunday for some areas.