The most ecological cities in Italy, decreed each year by Legambiente, differ from the others for various parameters. Among these the focus is definitely on waste sorting and recycling, on minimizing particles and CO2 pollution, but also on renewable energy sources, the use of environmentally sustainable building materials and the use of hybrid transport vehicles capable of respecting the environment.

The most ecological cities are characterized, moreover, by good maintenance of green areas, all to make the city more livable and the air more breathable: it is no coincidence that among them there are no large metropolis and, indeed, cities like Naples, Rome, Milan and Palermo are at the last places in the ranking.