Thursday will be a sunny, hot and hazy day in Philadelphia, though a Code Orange Air Quality Alert is in effect for much of the region.

New York state health officials have issued an Air Quality Health Advisory for NYC on Thursday due to the forecast presence of wildfire smoke from 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.