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Carbon monoxide (CO)
Advice and guidance on carbon monoxide (CO), and the prevention, diagnosis and treatment of CO poisoning.
This content was originally produced by Public Health England (PHE). This content is now owned and managed by the UK Health Security Agency (UKHSA).
Carbon monoxide (CO) is a colourless, odourless and tasteless gas, produced when fossil fuels such as gas, coal, coke and oil and other fuels burn without enough air.
Exposure to high indoor levels can be fatal, while exposure to lower levels can result in symptoms that resemble flu, viral infections or food poisoning.
Find more information about CO poisoning on the NHS website.
Diagnosis and management
Updates to this page
Published 4 March 2009
Last updated 17 November 2025
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Rebranded as an UKHSA page.
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First published.