In the Torre del Filosofo area, on days when the wind blows from the north-west, it is easy to be enveloped in the cloud of gas that descends along the flanks of the summit craters. It is an acrid smell, in which it is easy to recognise the smell of rotten egg typical of the presence of sulphur. Cover your mouth with a damp cloth if you stay for long periods, it will help you to breathe!
