By Friday morning the AQI levels will drop for New York City. Smaller smoke plumes will linger from Detroit to Pittsburgh to D.C.
By Saturday and Sunday, the winds will begin to switch and blow smoke away from the U.S.
The smoke originated from wildfires in Quebec, where more than 160 forest fires are burning. Some of the fires were ignited by lightning strikes, according to NASA , and unusually dry and warm weather is fueling the blazes. The intensity of the fires has exceeded the capacity of water bombers, Quebec's wildfire prevention agency announced on Monday, CTV reported.