Inspired by the 5 people found dead in Florida after carbon monoxide poisoning. Carbon monoxide (CO) is a colorless, odorless and tasteless gas, which is highly toxic to humans and animals. It consists of one carbon atom and one oxygen atom, connected by a covalent double bond and a dative covalent bond. It is the simplest oxocarbon, and is an anhydride of formic acid. So no signs that you have it or are breathing it espically if your sleeping.