Radon is a gas which naturally occurs in certain
rocks, such as granite, and some building materials. It is
colourless, odourless and almost chemically inert. In the open air,
radon is diluted to very low levels and poses no harm to health,
however it can be trapped in houses and build up to dangerous
levels.
Contact the
National Radiological
Protection Board in order to see if the area where you live is
affected by radon, and what measures you can take to minimise the
risks.