Geothermal Activity

Health risks of geothermal gases

Gases emitted from volcanoes and geothermal areas include water vapour (steam, carbon dioxide, sulfur dioxide, hydrogen sulfide and hydrogen chloride.  Gases are released through the soil in geothermal areas all of the time and may be released during eruptions and during periods of volcano unrest. 

In geothermal areas of Te Ika-a-Māui/the North Island, gases are released from geothermal features such as hot springs, and also through the soil. These gases are heavier than air and can accumulate in low-lying or confined spaces such as enclosed hot pools and basements.

How to keep yourself safe when visiting geothermal areas:

•  Understand the hazard: pay attention to information signs.
• Avoid bathing alone in geothermal hot pools.
• Avoid low-lying or poorly ventilated areas, particularly when you are alone.
• When visiting an outdoor geothermal area, keep upwind and away from the smell of the gases if you are uncomfortable or experience symptoms such as dizziness, nausea, a headache or shortness of breath. If these symptoms persist, see a medical professional.

For further information on the health hazards of volcanic and geothermal gases: https://www.ivhhn.org/uploads/IVHHN_gas_pamphlet_English.pdf 

Information on other Geothermal hazards such as boiling pools, subsidence, hydrothermal eruptions and high temperature fluids and steam are available on Bay of Plenty Regional Council website.