Wife and I both like it. Smells like well done steak.
Combusted hydrogen sulfide gas? H₂S
Addendum: Often smelled every day at various times we happen to pass by on the Interstate highway.
Interesting olfactory trip: Suncor’steak-like smell - Robert Hite sewage treatment plant - Boyers Coffee (recently burned), - a bakery. And now marijuana grow operations.