Germantown, TN –

“The leak was traced to an improperly vented water heater outside a Chili’s restaurant.

Chief Selberg said, apparently CO gas fumes were being pulled back into the shopping center’s air handling system, “It was up in the 200 parts per million range which is considered pretty high for CO.”

Firefighters and MLGW workers used gas monitors to trace the leak, but not before evacuating around thirty people from nine businesses…”

https://wreg.com/news/carbon-monoxide-leak-leads-to-evacuation-in-germantown/