The Stink-Fog That Coated Seattle Last Night

Ben GazyWho farted?
A little before midnight last night, Slog reader Bonnie sent us this email:
It's stinking up a storm in Wallingford tonight, and there's this constant suspicious fog outside that seems as though it might be connected to the smell. What gives?
A couple of hours before that, as I came home from dinner at a friend's house, I also noticed a foul smell in the fog, but I assumed it was a neighbor's stinky garbage.
But Bonnie was smelling it over in Wallingford.
It