An air quality advisory for Long Island is the result of smoke from Canada wildfires, New York State officials say.

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.

Parts of Canada are seeing some of their most unhealthy air yet, and the smoke is likely to move over the United States again this weekend.