Strupeni plini v jamah, rovtom in bunkerjih (Nevarnost CO2)

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Opis:
Glede na vrsto podzemnih votlin, ki jih vstopamo, lahko naletimo na različne koncentracije strupenih plinov. Visoka koncentracija ogljikovega dioksida je verjetno najpogostejša nevarnost za ljubitelje jam in starega rudarstva. Kako se zaščititi?