"Greenest town" is not a slogan — it can be measured. Two indicators capture a territory's environmental health better than most: the annual average PM2.5 concentration (the fine particulate most harmful to health) and the share of land consumed by concrete.
ISPRA and EEA data draw a clear geography: the Po Valley pays for climate, industry and traffic with Europe's highest PM2.5 levels, while the Apennines, the Alps and much of the South enjoy far better air.
The cleanest air
The 15 towns with the cleanest air (lowest PM2.5)
Annual average PM2.5 in µg/m³ — the lowest values
Soil consumption
The other side of "green" is how much land stays un-cemented. The most virtuous municipalities keep soil-consumption shares very low; conversely, metropolitan areas and tourist coasts have saturated most of the available land.
The 15 towns with the most soil consumption
Share of territory consumed — the highest values
The soil-consumption map
Soil-consumption map by municipality
Share of territory consumed — zoom to explore
Explore each municipality's environmental data in the Environment section and compare air quality in the Compare section. The green transition is decided here: stopping soil consumption and cutting PM2.5 where most Italians live.