Your respite from the effects of the Canadian wildfire season is over again. The Wisconsin Department of Natural Resources issued an air quality alert for much of Wisconsin, including Door and Kewaunee counties. The alert runs now until 3 p.m. on Tuesday, with the potential of being extended. The Air Quality Index (AQI), which takes into account the increased amount of particulate matter in the air, is expected to reach the Unhealthy for Sensitive Groups (Orange) to Unhealthy (Red) level. When the PM2.5 (particulate matter with a diameter of 2.5 microns or less) level is rated as unhealthy, it can cause health issues, including eye, nose, and throat irritation, coughing, and shortness of breath. People with heart or lung disease, older adults, and children should avoid prolonged or heavy exertion, while everybody else should reduce it. After the previous air quality alert lasted for over a week, Door and Kewaunee counties received a break from it over the weekend before the DNR’s announcement Monday morning.