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Carbon monoxide: the risks and how to spot them

You cannot see or smell it. Here is what to look for and what to do.

Carbon monoxide: the risks and how to spot them

Why it matters

Carbon monoxide is produced when gas does not burn properly. A faulty boiler, a blocked flue or a badly fitted appliance can all cause it, and you will not smell it.

Signs on the boiler

Yellow or lazy flames instead of crisp blue ones, soot or staining around the appliance, pilot lights that keep going out, and more condensation on windows than usual.

Signs in people

Headaches, dizziness, nausea and tiredness that improve when you leave the house. If everyone in the house feels unwell at the same time, take it seriously.

What to do

Open the windows, switch the appliance off, get outside and ring the gas emergency line on 0800 111 999. Fit an audible carbon monoxide alarm in every room with a gas appliance. They are cheap and easy to fit.

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