Smoke from wildfires in Canada drop hazy skies on the Manhattan skyline on Thursday in New York City. All of New York State and parts of New Jersey were under an Air Quality Advisory due to the smoke from more than 100 wildfires burning in Canada. Photo by John Angelillo/UPI | License Photo

July 16 (UPI) -- Thick smoke from Canadian wildfires poured into northeastern quarter of the United States on Thursday after similarly darkening skies across and prompting health warnings across much of the Great Lakes region.

Dangerous levels of smoke were noted across Canada and the northeastern and midwestern United States, sparking memories of the historically severe wildfire smoke outbreak in 2023.

Entire states including New York, New Jersey, Connecticut, Delaware, Massachusetts, Michigan, New Hampshire, Ohio, Pennsylvania, Rhode Island and Wisconsin were under air quality alerts.

By early Thursday, Minneapolis, Duluth, Minn., and Detroit were among the most heavily impacted areas of the country.