Radon in Marseille
Provence-Alpes-Côte d'Azur, France
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 (reduced from 400 Bq/m³ in 2018). Property owners must reduce levels if exceeded. Measurement recommended in radon priority zones.
Workplaces
Mandatory measurement in workplaces located in radon priority zones. Reference level 300 Bq/m³. Special controls required if >1000 Bq/m³.
Public buildings & schools
Mandatory measurement in schools, hospitals and public buildings in priority zones. Actions required if >300 Bq/m³, special controls if >1000 Bq/m³ (Arrêté 2019).
New construction
New buildings in radon priority zones must include protection measures. Design to achieve levels below 300 Bq/m³.
Professional services in Marseille
Accredited Organizations (N1/N2)
ASNR-approved organizations for radon measurement at Level 1 (basic) or Level 2 (advanced)
Competent Persons in Radiation Protection
ASNR-certified radiation protection specialists for workplaces including radon
Radiation Protection Experts
Higher-level expertise roles for complex radon risk assessments as defined in EU Directive 2013/59/Euratom
Real Estate Diagnostic Professionals
COFRAC-certified professionals handling ERNMT preparation including radon risk disclosure for property transactions
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.