Around half of the radiation people are exposed to in Finland comes from radon gas, which is a naturally occurring but radioactive by-product of the depletion of tiny amounts of uranium in the soil. Radon can seep up into houses where it can build up and pose a serious health risk.
Radon gas raises the risk of cancer in non-smokers to the same level as smokers.
The Radiation Nuclear Safety Authority says that 50,000 homes in Finland need to be checked for radon gas. Reducing radon gas in the home can usually be done through inexpensive and simple home improvements.