![](https://scied.ucar.edu/sites/default/files/media/images/co_molecule_edited.jpg)
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Carbon monoxide is a colorless gas found in small amounts in Earth's atmosphere. It is toxic to humans and other oxygen-breathing organisms.
![](https://scied.ucar.edu/sites/default/files/media/images/co_molecule_edited.jpg)
Carbon Monoxide Center for Science Education
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