Quigley explained that the hazier air quality was due to wildfire smoke making its way southeast from Canada, as well as parts of North Dakota and Minnesota's Arrowhead region.Get daily updates on the Packers during the season.

Maps show where new plumes of smoke will cause hazy skies through the end of the week. Low-level smoke is forecast to spread eastward Wednesday across the Appalachians and into the Mid-Atlantic and Northeast.

An air quality map shows conditions improving in the U.S. on Friday as smoke from the Canadian wildfires subsides.