At the time, officials said the boiler room had carbon monoxide levels exceeding 500 parts per million.

Carbon monoxide (CO) is an odorless, colorless gas that kills without warning. Hundreds of people die each year and thousands of others become ill because of CO, according to the CDC.

Carbon monoxide is known as the “invisible killer” due to being an odorless and colorless poisonous gas.

Carbon monoxide is known as the “invisible killer” due to being an odorless and colorless poisonous gas.

Fire department personnel responded to a call at 12:38 p.m. and found the worker in a boiler room with carbon monoxide (CO) levels exceeding 500 parts per million, authorities said.

A father and son were found dead after suffering from carbon monoxide poisoning in Detroit on Monday.

Carbon monoxide is known as the “invisible killer” due to being an odorless and colorless poisonous gas.

Kellye Canty and her nine-month-old baby Kanaan had just dropped her mother off for a doctor’s appointment at Harper Hospital. Canty and her baby remained in the car in the parking garage with the car running.

Police have identified the three people killed and the two others in critical condition due to carbon monoxide poisoning at Michigan’s Faster Horses Festival.