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CO, a toxic, odorless, colorless gas produced during fossil fuel or biomass burning. Compound consisting of one carbon and one oxygen. Except for carbon dioxide, it is one of the longest lived naturally occurring atmospheric carbon compounds (this wording is meant to exclude chlorofluorocarbons). The recent change in tropospheric CO content may portend a change in the balance between oxidants and reductants in the atmosphere.

[Journal of Geophysical Research;v95; 16443-16450;1990] [Scientific American;v261; 82-88;1989]

Source: Atmospheric Chemistry Glossary