Carbon monoxide (CO) is a colorless, odorless and tasteless gas. It’s made by incomplete fuel combustion frequently caused by insufficient oxygen. In your house, appliances that need natural gas, charcoal, wood or kerosene are at risk. Especially if they are not working accurately or have been installed improperly.
Vehicle exhaust fumes from nearby garages, as well as fireplaces that aren’t working right may also create carbon monoxide. CO is toxic to the body and is fatal at high levels or with extended exposure.