Carbon monoxide (CO) is a clear, odorless and tasteless gas. It’s created by partial fuel combustion usually caused by insufficient oxygen. In your residence, appliances that consume natural gas, charcoal, wood or kerosene are at risk. Especially if they are not operating correctly or have been installed wrong.
Vehicle exhaust fumes from nearby garages, as well as malfunctioning fireplaces can also produce carbon monoxide. CO is poisonous to the body and is fatal at heightened levels or with long exposure.