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Map of radon priority areas in Italy - Regional regulations

Radon Regulations

Regional Radon Regulations: Complete Guide for Every Region of Italy

Each Italian Region has implemented Legislative Decree 101/2020 with its own laws, defining priority areas, specific obligations, and different deadlines. Discover what regulations apply in your region: from current regional laws to concentration limits, risk maps, and penalties for non-compliance.

National Regulations
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Radon does not respect administrative borders, but laws do

The Legislative Decree 101/2020 established a national framework for radon protection, but delegated a crucial task to each Region: identifying Priority Areas, municipalities where the probability of exceeding the 300 Bq/m³ threshold is statistically higher and where radon measurement obligations become stricter.

The result is an evolving regulatory mosaic: each Region proceeds with its own timelines and criteria, publishing resolutions that can radically change obligations for employers across entire territories. On this page, you will find an updated summary of each published regional regulation, with risk maps, legislative references, and links to complete guides.

Remember: even if your region hasn't identified Priority Areas yet, measurement obligations for basement and semi-basement premises apply throughout the entire national territory.

LombardyVenetoFriuli Venezia GiuliaTrentino Alto AdigeAosta ValleyTuscanyCampaniaPuglia
LombardyDGR 7/2025

Radon Lombardy: ~230 Priority Municipalities and DGR 7/2025 Obligations

Lombardy was among the first Italian regions to complete territory classification under Legislative Decree 101/2020. With DGR 7/2025, the Region identified approximately 230 Municipalities in Priority Areas, mainly concentrated in the pre-Alpine and Alpine areas of Bergamo, Brescia, Como, Lecco, Sondrio, and Varese provinces. The widespread presence of metamorphic and granitic rocks in the Lombard subsoil, combined with the permeability of morainic deposits, favors the rise of radon gas into buildings. Measurement obligations now extend to all ground-floor workplaces in these municipalities, in addition to already obligated basement premises throughout the region. Lombardy also has specific provisions for recovering semi-basements for residential use, subject to radon concentration verification.
Municipalities~230
AgencyARPA Lombardia
Complete Guide Lombardy
Map of Radon Priority Areas Lombardy 2025 – ~230 Classified Municipalities
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VenetoDGR 464/2025

Radon Veneto: 21 Priority Municipalities in the Belluno Dolomites

With DGR 464/2025, Veneto identified 21 Municipalities in Priority Areas, located almost exclusively in the pre-Alpine and Dolomite belt of the Belluno province. The geological structure of the Venetian Prealps, characterized by fractured limestone rocks and permeable morainic deposits, creates ideal conditions for radon gas upwelling. The Belluno valleys, particularly Val di Zoldo, Agordino, and Cadore, have some of the highest natural concentrations in the Northeast. The resolution requires employers in classified municipalities to measure ground-floor premises as well, with strict deadlines for schools and public activities.
Municipalities21
AgencyARPAV
Complete Guide Veneto
Map of Radon Priority Areas Veneto – 21 Municipalities in Belluno Province
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Friuli Venezia GiuliaDGR 1622/2024

Radon Friuli Venezia Giulia: 215 Priority Areas, from Carso to Carnic Alps

Friuli Venezia Giulia is at the national forefront in radon protection. With DGR 1622/2024, the region classified a remarkable 215 Municipalities as Priority Areas, the highest number in Italy relative to territory size. The geological complexity is unique in Europe: in the Trieste and Gorizia Karst, fractured limestone rocks create "natural chimneys" channeling gas to the surface rapidly; in the Carnic Alps, ancient Paleozoic rocks hold high uranium-238 concentrations. ARPA FVG has conducted decade-long campaigns like the "Radon in 1000 families" project. Monitoring obligations extend to all ground-floor premises in priority areas, including specific cases in Trieste districts.
Municipalities215
AgencyARPA FVG
Complete Guide Friuli Venezia Giulia
Map of Radon Priority Areas Friuli Venezia Giulia – 215 Classified Municipalities
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Trentino Alto AdigeResolution No. 110/2024 (BZ)

Radon Trentino Alto Adige: Bolzano Resolution 110/2024 and Alpine Risk

Trentino Alto Adige presents a unique regulatory framework due to provincial autonomy. The Autonomous Province of Bolzano completed a pioneering process with Resolution No. 110/2024, officially defining priority areas (Radonrisikogebiet) and attention areas (Radonvorsorgegebiet). Classification relies on over twenty years of monitoring by APPA Bolzano. The territory features magmatic and metamorphic rock formations — particularly granites and porphyries of the Athesian volcanic complex — naturally rich in uranium. The Province of Trento has not yet issued a similar updated measure, but the national obligation for radon risk assessment remains fully in force.
MunicipalitiesBolzano classified
AgencyAPPA Bolzano
Complete Guide Trentino Alto Adige
Map of Radon Priority Areas Province of Bolzano – Risk and Attention Zones
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Aosta ValleyDGR 1630/2025

Radon Aosta Valley: 11 Priority Municipalities amid Granites and Thermal Inversion

Aosta Valley holds a geological record making it one of the regions with the highest average radon concentrations in Italy. With DGR 1630/2025, published on January 27, 2026, the Region identified 11 Municipalities in Priority Areas, including Courmayeur, Gressoney-La-Trinité, and Valsavarenche. The cause lies in the Alpine rocks themselves: granitic massifs and porphyries rich in uranium-238. The valley morphology amplifies the phenomenon: in valley floors, thermal inversion traps gas in lower atmospheric layers, facilitating entry into buildings. ARPA VdA's methodology combines direct data (measurements in 45 of 74 municipalities) with a predictive radio-geo-lithological model.
Municipalities11
AgencyARPA VdA
Complete Guide Aosta Valley
Map of Radon Priority Areas Aosta Valley – 11 Classified Municipalities
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TuscanyDGR 1579/2024

Radon Tuscany: Monte Amiata and Elba Island among 11 Priority Municipalities

With DGR 1579/2024, published in BURT No. 2 on January 8, 2025, Tuscany identified 11 Municipalities in Priority Areas concentrated in two geologically critical zones. Monte Amiata, an ancient extinct volcano in Grosseto and Siena provinces, is a major natural radioactive hotspot: its trachytic and rhyolitic rocks contain high uranium concentrations. On Elba Island (Livorno), the granitic massif of Monte Capanne features radioactive mineral inclusions releasing radon through subsurface fractures. Affected municipalities include Abbadia San Salvatore, Arcidosso, Capoliveri, Marciana, and others. ARPAT's technical investigation confirmed that the probability of exceeding the 300 Bq/m³ threshold in these zones is significantly higher than the regional average.
Municipalities11
AgencyARPAT
Complete Guide Tuscany
Map of Radon Priority Areas Tuscany – 11 Municipalities near Monte Amiata and Elba Island
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CampaniaRegional Law 13/2019

Radon Campania: From Vesuvius to Phlegraean Fields, Law 13/2019

Campania was one of the first Italian regions to adopt specific radon legislation with Regional Law 13/2019, partly anticipating Legislative Decree 101/2020. Radon risk in Campania is strictly linked to volcanic activity: Vesuvius and the Phlegraean Fields are primary sources. Pyroclastic materials like Neapolitan yellow tuff, core to historical Campanian construction, are main gas vectors. The highest indoor concentrations are recorded in North Naples, Avellino area, and Irpinia, where volcanic substrate dominates. ARPAC manages environmental monitoring and measurement campaigns. Measurement obligation applies to all workplaces in municipalities identified as priority areas.
MunicipalitiesVolcanic Areas
AgencyARPAC
Complete Guide Campania
Map of Radon Priority Areas Campania – Volcanic Zones Vesuvius and Phlegraean Fields
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PugliaL.R. 30/2016 + DGR 1523/2025

Radon Puglia: Lecce Province Central to DGR 1523/2025

Puglia boasts one of the longest-standing regional radiation protection regulations, with Regional Law 30/2016 preceding national implementation of the Euratom Directive. The latest updates come from DGR 1523/2025, which concentrated priority areas in the Lecce province. The Salento area poses the highest regional radon risk: the geological structure of calcarenitic substrate ("Lecce stone") and particular hydrogeological conditions favor gas accumulation in buildings, especially older ones with poorly insulated foundations. Data collected by ARPA Puglia via the regional WebGIS system confirmed concentrations significantly above average in coastal zones and the Salento hinterland. The deadline for first mandatory measurements is set for October 2027.
MunicipalitiesLecce Province
AgencyARPA Puglia
Complete Guide Puglia
Map of Radon Priority Areas Puglia – Municipalities in Lecce Province
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Warning

National Obligation Doesn't Wait for Your Region

Even if your region is not yet on the list, Legislative Decree 101/2020 imposes obligations that apply throughout the entire national territory.

Basement Premises

In all of Italy, radon measurement is mandatory for all workplaces located on basement or semi-basement floors.

300 Bq/m³ Limit

The maximum annual average concentration must not exceed 300 Bq/m³. If exceeded, remediation is mandatory within 24 months.

Criminal Penalties

Non-compliance is punished with arrest from 1 to 6 months or a fine from 2,000 to 15,000 euros (Art. 205 Legislative Decree 101/2020).

Learn More About National Regulations
FAQ

Regional Radon Regulation FAQs

Which Italian regions have identified Radon Priority Areas?
To date, 8 regions have completed classification: Lombardy (~230 municipalities), Friuli Venezia Giulia (215 municipalities), Veneto (21 municipalities), Trentino Alto Adige (Province of Bolzano), Aosta Valley (11 municipalities), Tuscany (11 municipalities), Campania (volcanic areas), and Puglia (province of Lecce). The remaining regions are still completing technical assessments.
What are Radon Priority Areas?
Priority Areas are municipalities where the probability of exceeding the reference concentration of 300 Bq/m³ of radon is statistically higher. They are identified by individual Regions based on geological and radiometric data, as required by Art. 11 of Legislative Decree 101/2020. In classified municipalities, the radon measurement obligation extends to ground-floor premises, not just basements.
If my region hasn't identified Priority Areas yet, must I still measure radon?
Yes. Regardless of regional classification, Legislative Decree 101/2020 mandates radon measurement for all workplaces located on basement or semi-basement floors throughout the national territory. National penalties include arrest from 1 to 6 months or a fine up to 15,000 euros for non-compliance (Art. 205).
What is the radon concentration limit allowed by law?
The maximum annual average radon concentration limit in workplaces is set at 300 Bq/m³ by Legislative Decree 101/2020. If exceeded, the employer has 24 months to implement remedial measures and verify effectiveness with a new measurement. To learn more, see our page on what is radon gas.
What are the penalties for not measuring radon?
Art. 205 of Legislative Decree 101/2020 provides for arrest from 1 to 6 months or a fine from 2,000 to 15,000 euros for employers who fail to carry out radon measurements in obligated premises. In case of failure to remediate after exceeding the limit, penalties are more severe. Check the guide to national regulations for full details.
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