The New Fairfield Volunteer Fire Department is cautioning people about carbon monoxide. Even low levels can make a person sick, and high levels can kill. The invisible, odorless gas can escape from any fuel-burning appliance, such as a gas furnaces, water heaters and stoves, or an automobile idling in a closed or attached garage. Common Symptoms of CO Poisoning include headache, dizziness, fatigue, nausea and flu-like symptoms. New Fairfield fire officials urge people to install carbon monoxide detectors. If the alarm goes off, everyone should be moved to a source of fresh air outdoors.