All of the above materials are emitted from volcanoes to the atmosphere, i.e., sulfur dioxide, hydrogen sulfide and carbon dioxide.
During a volcanic eruption, water vapor (H2O), carbon dioxide (CO2), and sulfur dioxide make up 90% of the gas molecules released (SO2). Small amounts of hydrogen sulfide, carbon monoxide, hydrogen chloride, hydrogen fluoride, and other minor gas species make up the final one percent. Among these, sulfur dioxide can impair breathing in both healthy individuals and those suffering from asthma and other respiratory conditions.
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