Carbon Monoxide Is A Deadly Gas That Can Kill! Keep Your Family Safe With A Carbon Monixide Detector and smoke detectors. One of the first lines of defense against deadly fires and smoke, is having working smoke alarms throughout your home and living area. A second very important monitoring device to have in your home is a carbon monoxide detector. What is Carbon Monoxide? Carbon monoxide (CO) is a colorless, odorless, poisonous gas. A product of incomplete burning of hydrocarbon-based fuels, carbon monoxide consists of a carbon atom.