There were no air quality alerts across the U.S. early Friday, following a flurry of warnings partly linked to wildfires in Canada.

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.