Wilmington, DE –

“At 12:29 p.m. the Wilmington Fire Department was alerted of a carbon monoxide alarm…”

“Responding units found carbon monoxide readings over 500 parts per million (ppm) in the structure…cause of the carbon monoxide was found to be a gas-powered pressure washer being operated in the basement.”
6 children hospitalized for CO poisoning at Wilmington apartment – NBC10 Philadelphia (nbcphiladelphia.com)