‘One day it will just go off’: are Naples’ volcanic craters about to blow?

Campi Flegrei, a constellation of ancient craters in the south of Italy, is more active than Vesuvius, and residents live with daily tremors

Visitors to Francesco Cammarota’s home have envied the views from his balcony.

To the right is the Gulf of Pozzuoli, where the Mediterranean Sea laps the distant islands of Procida and Ischia. Directly in front is Solfatara, a shallow volcanic crater whose sulphurous vapours are known for their therapeutic benefits.