The Radon risk has been mapped by the federal government.

The radon reference value in Switzerland, i.e. the maximum acceptable radon concentration in an inhabited room, is 300 Bq/m3.

You can easily check whether a dwelling in Switzerland is at risk of radon accumulation and exceeding the reference value, using the radon map drawn up by the FOPH (Federal Office of Public Health). Simply enter the address of the building in the interactive map to obtain detailed information on the risk level in your area.

Probability [%] of exceeding the reference value, FOPH, 2018: