Mystery Solved

And just like that, the Donut Phenomenon is no longer a mystery. Thanks to a tip from a reader, the source turns out to be Horizon Snack Foods.

I drove by the place just to verify and two Horizon employees were walking out. When I asked them if the factory was the source of the “donut” smell in Salt Lake, they flashed huge knowing smiles and a hearty “yep.” They also informed me that the smell comes from fruit pies, not donuts.

Thanks Internet.