Contaminated land
Radon gas
Radon gas is a naturally occurring radioactive gas that is released from some types of geology. Although the gas is radioactive, it is not considered to be a health issue until the gas becomes trapped in a confined space and concentrations of the gas build up to levels that are considered to be of concern.
You can find out if your property is located in a radon-affected area and order a radon testing kit on the UK Radon website.