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.

Smoke from Canadian wildfires is engulfing much of the eastern and central United States and and is expected to continue for days.