A special air quality statement has been issued for Waterloo region and the surrounding area. And while it could improve, Environment Canada says to expect another round of bad air this weekend.

People with heart or lung disease, older adults and children should consider making outdoor activities shorter and less intense and reducing heavy exertion.

Canadian wildfires in Manitoba and Saskatchewan have prompted air quality alerts in Minnesota, Wisconsin and Michigan on Wednesday and Thursday as residents are advised to "limit prolonged or heavy exertion.