What is the definition of Operates Fumes?

"Operates fumes" is like saying a factory runs on invisible, invisible smoke. It's the term for a place that produces hazardous emissions but doesn't give any indication of what's actually happening. Just imagine it: a bustling, smoky office with a sign that reads 'Operates Fumes' in large, ominous letters.

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Now, here's a darkly comedic example: "As I walked through the neon-lit corridors of my old, decrepit corporate headquarters, I couldn't help but wonder if they were actually operating fumes or just really, really well-lit chandeliers."