Are geothermal gases dangerous?

Geothermal gases can be dangerous when found in high concentrations, but are rapidly diluted to harmless levels when they are exposed to fresh open air. Gases can also travel through soil and into indoor air through cracks in foundations and utilities. Houses with cement foundations ("slab-on-grade") have the greatest risk for gases moving from underground into indoor air. These gases can make people sick if they accumulate in enclosed spaces, buildings or low-lying areas such as a basement or crawl space. At high levels they can cause suffocations or sometimes explosions. Children and pets are most sensitive to the effects of geothermal gases because they are closer to the ground.

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1. What are geothermal gases?
2. Are geothermal gases dangerous?
3. How can I tell if geothermal gases are present?