Volcanic Gases

gas

Volcanic gases predominately consist of steam, followed by carbon dioxide and lesser amounts of sulphur and chlorine compounds.

Hazardous concentrations of gases are present only very close to the crater (within 1 -2 km). Away from the vent gases pose no more than an irritant or nuisance.

Measuring the chemistry of the gases coming out of a volcano is one of the key volcano monitoring methods: