It's 8 a.m. on a Tuesday. You're balancing a hot coffee on a crowded train, when it hits you — a smell so putrid, you consider burying your head in a stranger's puffy coat to escape the smell. But you can't — you're stuck underground in a poorly ventilated aluminum tube.
The doors finally open and you tumble out, a brave survivor of The Underground Fart Cloud. Yes, that mass of air funk has a name.
