What is the definition of Mills Fumes?

"Mills fumes" is like the stale air from a really old, poorly maintained factory after a long shutdown. Imagine it's the byproducts of a massive industrial revolution that happened in the 90s, but with way less enthusiasm and way more toxic substances. It's the noxious, sultry remnants of a bygone era that hangs heavy in the air like a bad joke stuck on repeat.

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Here's an edgy sentence using it: "The detective's nose wrinkled at the mills fumes, but the case remained unsolved until the culprit decided to switch from 'ills' to 'wet cleaners' for his next heist."