Carbon monoxide (CO) is a [clear, odorless, and tasteless](https://princessbride.fandom.com/wiki/Iocane) gas that can kill you. It is created and found in fumes associated with burning fuel found in cars, trucks, buses, engines, and other modes of transportation. It is also found in home appliances like stoves, grills, lanterns, fireplaces, and even furnaces.