People living in Cornwall are being encouraged to have their homes tested for radon.
Radon is a colourless and odourless gas
Kerrier District Council is running a campaign to raise awareness of the potentially harmful gas.
Radon is a colourless and odourless gas which exists naturally across the UK, but is found in much heavier concentrations in Cornwall.
In high concentrations and with long exposure it can be a cause of lung cancer.
Now Kerrier District Council and the National Radiological Protection Board is running a campaign to raise awareness.
And one estate agent in west Cornwall is offering free radon tests to anyone thinking of using them to buy a new home next year.