Carbon monoxide, also known as CO, is called the “Invisible Killer” because it’s a colorless, odorless, poisonous gas. More than 150 people in the United States die every year from accidental nonfire-related CO poisoning associated with consumer products, including generators. Other products include faulty, improperly-used or incorrectly-vented fuel-burning appliances such as furnaces, stoves, water heaters and fireplaces. Read more