Radon is found everywhere. It is a colourless, odourless radioactive gas. We can't see, smell or taste it and special equipment is required to detect it.
Radon is formed by the radioactive decay of the small amounts of uranium that occur naturally in all rocks and soil. The radon level in the air we breathe outside is very low but can be higher inside buildings.
Any exposure to this type of radiation is a risk to health and can cause damage to living tissues increasing the risk of lung cancer.
Further information is available from Public Health England