The 1963 hit "Lazy Hazy Crazy Days of Summer" by Nat King Cole evokes summertime nostalgia, but this summer the haze might only elicit scratchy eyes and N95 masks. Smoke from Western Ontario and Minnesota wildfires has been drifting over the Northeast, causing a thick yellow haze and air quality warnings. This was the scene above the North Campus late last week. Photo: Douglas Levere