Dr. Tom Ryan:

The whole objective of the national radon strategy is to improve the situation. What we do know and what is amply demonstrable is that with barriers and remediation measures in houses, one can achieve very significant reductions in radon exposure and, therefore, the risk to one's health goes down. We know it is a scientific fact that if someone has a house with a high level of radon and intervenes by putting in a sump or if a person builds a new house and reduces the potential exposure by having a radon barrier installed, these measures work.