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.

In central Utah, the Monroe Canyon Fire has burned 48,000 acres and is 7% contained as evacuation orders have been put in place. A total of 23 million Americans across six states are under heat advisories on Friday as heat indices between 105 to 110 are expected from Louisiana to South Carolina.