AdvertisementPhotos: Extreme Canadian wildfire smoke shrouds parts of U.S.June 07, 2023Nicole WerbeckfacebookEmailBuildings in the Manhattan skyline shrouded in smoke from Canada wildfires at sunrise in Jersey City, New Jersey, on Weds., June 7, 2023. New York was the most polluted major city in the world on Tuesday night, as smoke from Canadian wildfires blanketed the city in haze. (Bloomberg via Getty Images)