Carbon monoxide (CO) is a colorless, odorless and tasteless gas. It’s created by incomplete fuel combustion usually caused by a lack of oxygen. In your house, appliances that consume natural gas, charcoal, wood or kerosene are at risk. Especially if they are not running accurately or have been installed wrong.
Vehicle exhaust fumes from nearby garages, as well as poorly operating fireplaces may also create carbon monoxide. CO is poisonous to the body and is lethal at high levels or with extended exposure.