Radon gas causes more deaths a year in the UK than carbon monoxide. It is a naturally occurring colourless, odourless radioactive gas, which disperses harmlessly into the air outdoors. However, once it finds its way indoors, through gaps and cracks in floors and walls, it may build up to potentially harmful levels. Every building has radon and in most areas the levels are low, however, some buildings in “radon Affected Areas” have higher levels. Buildings in these areas need to be tested for radon and if discovered, high levels can be reduced with simple measures.