Radon is a naturally occurring radioactive gas, colourless and odourless, produced by the decay of uranium in the ground. It can build up in enclosed spaces, particularly in basements and semi-basements. According to the World Health Organization, it is the second leading cause of lung cancer after smoking.
3D Planet includes a qualified Radon Remediation Expert on staff, to guide clients and employers through the correct assessment and management of this risk.
The regulatory framework — Italy
The information below refers specifically to Italian legislation. Requirements and reference levels for radon vary by country: if your project is outside Italy, your local regulations will apply instead.
In Italy, the relevant law is Legislative Decree 101/2020, which transposed EU Directive 2013/59/Euratom on radiation protection. For workplaces, the decree sets a reference level of 300 Bq/m³, expressed as the annual average radon activity concentration in air.
The national framework is completed by the National Radon Action Plan 2023-2032, adopted by Prime Ministerial Decree on 11 January 2024, which identifies priority areas of the country and the types of premises where measurement is mandatory.
Who is required to measure
Measurement is mandatory in particular for:
— underground workplaces, or those with at least three perimeter walls (even partially) below ground level;
— ground-floor premises in municipalities classified as priority areas;
— thermal spa facilities;
— other premises identified by the National Radon Action Plan.
Measurement is carried out using passive dosimeters left in place for an extended period, typically twelve months, in order to obtain a representative annual average concentration. The measurement outcome must be kept on file and made available, and forms part of the workplace Risk Assessment Document (DVR).
When the measured concentration exceeds the reference level, the employer is required to adopt corrective measures, identified with the support of a Radon Remediation Expert — a professional role introduced precisely by Legislative Decree 101/2020.
A regulatory framework still evolving
The regulatory picture keeps expanding. As of 2 February 2026, Italy's new Minimum Environmental Criteria for construction (Ministerial Decree of 24 November 2025) require a radon monitoring plan to be included already at the design stage for public offices, schools, healthcare facilities, new buildings and renovation works. We actively follow these updates to offer advice that is always aligned with current requirements.
Our support
Our service includes measurement with passive dosimeters, risk assessment and the related reporting, and — when necessary — support in defining the most suitable remediation measures for the building, working closely with the client and the other professionals involved in the project.