Climate and risks: seismic zone 4, the Ombrone plain and summer ozone
Grosseto is in seismic zone 4, the least hazardous, in the Civil Protection classification (May 2025). ISPRA IdroGEO estimates 4.6% of residents in medium-hazard flood areas and 0.5% in high or very high landslide-hazard areas. In 2024 PM10 exceeded the daily threshold on at most 2 days; ozone is the pollutant that most often exceeds target values.
Sections: Seasons · Rainfall · Temperatures · Air quality · Environmental hazards
Earthquakes
In the Civil Protection Department's seismic classification of municipalities, updated in May 2025, the Comune di Grosseto is in zone 4, the one with the lowest hazard.
Floods and landslides
The Comune's page on ISPRA's IdroGEO platform, with the indicators of the ISPRA 2024 report, estimates 4.6% of residents in areas flooded under the medium-hazard scenario and 0.5% in high or very high landslide-hazard areas. The platform shows the areas on a map, useful for checking a district before choosing a home.
Air
According to ARPAT's 2025 Yearbook, in 2024 the GR-URSS and GR-Sonnino stations exceeded the daily PM10 threshold of 50 µg/m³ on 1 and 2 days respectively, against the 35 allowed. For ozone, measured at GR-Maremma, the health target value was exceeded on 18 days in 2024, with a three-year average of 19 against a maximum of 25; the vegetation indicator (AOT40) was above its target.
River and sea
The stretches of the Ombrone in the municipality are in sufficient ecological status and not good chemical status for 2022–2024. The municipality's 7 bathing areas, along about 19.5 km of coast, were all classified excellent in the 2024 season.
Data
Sources
Updated: 2026-10-22
Updated: 2026-10-22
Updated: 2026-10-22
Reviewed: 10/23/2026 · by piero.avolio · rev. 1 · Period: → 2027-10-31
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