Secondary volcanism: mofettes

In the western and southern sectors of the Lake, there are (and appropriately signaled) outflows of volcanic gas, potentially dangerous because they contain toxic gases such as CO, CO2, H2S and SO2. In particular, carbon dioxide (CO2), denser than air, tends to accumulate on the ground in the absence of wind, where it can reach high concentrations. Being colorless, odorless and tasteless, it is impossible for us to perceive its presence. At low concentrations it can cause increased respiratory activity, nausea, visual disturbances, while at high concentrations it leads to asphyxia and death.

Volcanic gas emissions make some places toxic to humans, as occurs in the vicinity of "mofettes", where carbon dioxide is abundant and is lethal for smaller organisms.