Carbon monoxide (CO) is an invisible, odorless and tasteless gas. It’s produced by partial fuel combustion often caused by not enough oxygen. In your house, appliances that need natural gas, charcoal, wood or kerosene are vulnerable. Especially if they are not running correctly or have been installed wrong.
Vehicle exhaust fumes from neighboring garages, as well as poorly operating fireplaces may also produce carbon monoxide. CO is dangerous to the body and is fatal at high levels or with extended exposure.