Campi Flegrei, Co2 Concentration Ordinance

The mayor of Pozzuoli issues an urgent order after abnormal concentrations of carbon dioxide are detected in an area bordering Naples and the Phlegrean municipality. The images show the crater and homes in the areas affected by the measure, which particularly affects underground, semi-underground, and/or poorly ventilated rooms. (Photo by Paolo Manzo/NurPhoto via Getty Images)