Are there any caves that have air that is toxic for humans to breathe?



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    Yes, some caves have “bad air,” which is usually caused by poor circulation, or the oxidation of sulfides that deplete the oxygen content but leave nitrogen and or carbon dioxide. Canary Islands’ Barranco de Los Cochinillos cavern is an example of a cave with ‘bad air’ that is harmful and can even be lethal to humans.

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