The levels of Radon Gas in indoor air appear to have increaased in recent decades, probably as a result of a desire for 'tighter' building enclosures in order to reduce energy consumption. 
The down-side of these new 'draught free' homes is that the Radon Gas collecting inside a building has very few points of egress. This can result in a significant amount of build up of the Radon Gas and a significant increase in the risk of developing lung cancer for the inhabitants.
As these factors usually vary from building to building, each case must be considered separately.
The more porous and fragmented the underlying rocks and soil are, the greater the amount of Radon Gas that can arise to the surface. The gas can enter a building in a convective flow through cracks and holes in the floor area and any gaps around service pipes and cables. It is usually pressure-driven owing to the slightly lower indoor air pressure compared with that under the floor: a result of wind and temperature differences.
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