Volcanic gases are the volatile components released from magma during an eruption, including water vapor, carbon dioxide, sulfur dioxide, hydrogen sulfide, and other trace gases. These gases are significant in volcanology for understanding eruption dynamics, the impact of volcanic eruptions on the atmosphere, and the monitoring of volcanic activity.
Source Symonds, R. B., Gerlach, T. M., & Reed, M. H. (2001). “Magmatic Gas Scrubbing: Implications for Volcano Monitoring.” Journal of Volcanology and Geothermal Research, 108(1-4), 1-4.