Radon in Helsinki
Uusimaa, Finland
Geological Context
Location and surrounding area
No official radon classification is available for this municipality.
What the regulations require
Dwellings
Reference level 300 Bq/m³ for existing dwellings (updating to 200 Bq/m³ effective 2026).
Workplaces
Reference level 300 Bq/m³ for workplaces. Occupational exposure limits apply for extreme cases.
New construction
Design level 200 Bq/m³ for new dwellings. Buildings must be designed to not exceed this level.
Professional services in Helsinki
STUK-Approved Radon Measurement Services
STUK-approved and FINAS-accredited (ISO/IEC 17025) radon measurement services
Radon Mitigation Contractors
Contractors specializing in radon reduction including sub-slab depressurization and radon wells
Radon Consultants
Technical consultants for radon-safe new construction design targeting 200 Bq/m3
FINAS-Accredited Laboratories
FINAS-accredited ISO/IEC 17025 laboratories for radon measurement and analysis
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.
FAQ
What does the radon potential classification mean?▾
The radon potential indicates the likelihood that buildings in this area will have elevated radon levels, based on geological and measurement data from official authorities. It does not predict the level in any individual building.
Is measurement mandatory here?▾
It depends on the national regulations and the type of building. In priority action zones, measurement is often mandatory for workplaces and public buildings. For dwellings, measurement is generally recommended. Check the obligations section above for details specific to this country.
What should I do if the level is above the reference level?▾
If your long-term measurement exceeds the national reference level, mitigation measures such as sub-slab depressurization, sealing or improved ventilation can reduce radon levels significantly. Contact a qualified radon professional.