If you struggle with asthma, heart disease, or other ailments affecting your heart and lungs, you will have to wait another day before resuming your usual outdoor activities. The Wisconsin Department of Natural Resources extended its statewide Air Quality Alert until Friday at noon. It had been slated to expire at noon on Thursday. Much of the state has teetered between the Unhealthy and Unhealthy for Sensitive Individuals levels since Tuesday, but NowCast Air Quality Index (AQI) values have some areas that could experience levels in the Very Unhealthy category. Air quality conditions are expected to start improving on Friday, but the DNR suggests that the AQI could stay troublesome for people in sensitive groups through the weekend. Canadian wildfires in Saskatchewan and Manitoba remain the culprit for the AQI alerts that are also impacting parts of Minnesota, Iowa, Illinois, Indiana, and Michigan.