Carbon monoxide (CO) is a colorless, odorless and tasteless gas, yet very toxic to humans and animals. It consists of one carbon atom and one oxygen atom, connected by a covalent ...
http://en.wikipedia.org/wiki/Carbon_monoxide
Carbon monoxide (CO) is a colorless, practically odorless, and tasteless gas or liquid. It results from incomplete oxidation of carbon in combustion.
http://www.epa.gov/iaq/co.html
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