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.

Another wind shift arriving Wednesday morning will place southern Ontario directly downwind from the wildfires, resulting in another bout of upper-level smoke in the air