Carbon Monoxide Information Center

The Invisible Killer

Carbon monoxide, also known as CO, is called the "Invisible Killer" because it's a colorless, odorless, poisonous gas. According to the CDC, more than 400 in the United States die every year from accidental non-fire related CO poisoning. Products that can produce deadly CO levels include generators and faulty, improperly-used or incorrectly-vented fuel-burning appliances such as furnaces, stoves, water heaters and fireplaces.