Specific advice on the issue of radon contamination of buildings.

Radon is a gas formed naturally by the decay of uranium, an element present in varying quantities in almost all rocks and consequently in soils. Radon is radioactive, but to our senses it is odourless, colourless and tasteless, so it is difficult to detect and quantify without the appropriate instruments.

In the open air it disperses, while if it enters a building, penetrating through the permeable zones of the envelope, it can stagnate and prove dangerous. High concentrations of radon are mainly found in those rooms or rooms that are in direct contact with the ground, such as crawl spaces, cellars, basements, garages, but it can also spread to rooms on higher floors where people generally stay for longer hours and are therefore more exposed.

Prolonged exposure to radon in concentrations above the limit values can cause lung cancer, of which it is the second leading cause after smoking. It is estimated that radon causes between 200 and 300 deaths per year in Switzerland.
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