Smoke from Canadian wildfires is causing air quality concerns for millions of Americans in the Midwest and Northeast. Air quality alerts were in effect Tuesday in several states, including Wisconsin,

The National Weather Service announced air quality alerts in 10 states Tuesday as smoke from the Canadian wildfires continues to spread across the U.S. border. The alerts come as the Canadian Interagency Forest Fire Centre lists 746 active fires Tuesday morning,

Last week, Canadian wildfire smoke blanketed Wisconsin and caused the Air Quality Index to reach the unhealthy level for sensitive groups. Six days later, on July 31, the smoke appears to have a worse impact on the air.