Radon in Switzerland
Official radon data, regulations and resources
National reference level
300 Bq/m³
Competent authority
Federal Office of Public Health (FOPH)
What should you do?
Regardless of the official classification, the only way to know the radon level in a specific building is to measure it. A long-term test (at least 3 months) is recommended. You can either test yourself with passive detectors or hire a certified professional.
Regulations & obligations
Dwellings
Reference level 300 Bq/m³ for inhabited spaces (reduced from 1000 Bq/m³ in 2018, StSV).
Workplaces
Reference level 300 Bq/m³ for workplaces. Threshold level 1000 Bq/m³ for specially exposed workplaces.
New construction
New buildings in radon-affected areas must include protection measures. Reference level 300 Bq/m³.
Measurement protocols
Professional services
Radon Specialists (FOPH-recognized)
FOPH-recognized radon specialists for measurement and consulting
Accredited by: FOPH
Recognized Radon Measurement Offices
FOPH-recognized measurement offices with SAS accreditation for passive and active radon monitoring
Accredited by: FOPH
Radon Remediation Companies
Companies specializing in radon mitigation including depressurization, sealing and ventilation
How radon is measured in Switzerland
Each country has its own official measurement protocol. Here is how radon testing works according to the national guidelines.
Measurement method
Passive radon dosimeters (alpha-track)
Minimum duration
At least 3 months during heating season
Recommended season
September–April (heating season)
Detector placement
Lowest occupied rooms, at least 1 detector in each living and working space with ground contact
Laboratory requirements
FOPH-recognised radon measurement laboratory
Reference standard: ISO 11665 · StSV (Strahlenschutzverordnung)
How to test for radon yourself
Regardless of where you live, testing for radon is easy and affordable. A long-term measurement with passive detectors is the most reliable way to know your indoor radon level.
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