Heavy smoke from Canadian wildfires blanketed parts of the United States on Thursday, stretching from the Great Lakes to portions of the East Coast, reducing visibility, disrupting commutes and prompting air quality alerts warning that outdoor activities could be hazardous.
Take a look at the map below to see where wildfire smoke is heaviest and air quality conditions are at their worst.
The Source: The Associated Press contributed to this report. This story was reported from Los Angeles.