Carbon monoxide (CO) is an invisible, odorless and tasteless gas. It’s created by incomplete fuel combustion usually caused by insufficient oxygen. In your house, appliances that consume natural gas, charcoal, wood or kerosene are vulnerable. Especially if they are not running properly or have been installed improperly.
Vehicle exhaust fumes from attached garages, as well as poorly operating fireplaces could also produce carbon monoxide. CO is poisonous to the body and is fatal at heightened levels or with long exposure.