When fuels like gas, oil, coal, and wood do not burn completely, carbon monoxide is generated. Carbon monoxide gas is produced by burning charcoal, operating automobiles, and cigarette smoke. Fuels such as gas, oil, coal, and wood are used in a variety of domestic equipment, including boilers. It doesn't have a smell, a taste, or a sound.
When carbon monoxide is inhaled, it displaces oxygen from the bloodstream, depriving the heart, brain, and other critical organs of oxygen. CO poisoning may happen quickly and without warning, causing you to lose consciousness and suffocate.