The phrase "volcanic emissions" refers to gases, ash, and other substances that are released into the atmosphere during volcanic eruptions. Full definition
The new volcanic emissions information pulls together opportunities to improve monitoring of natural hazards, human health risks and climate processes — one volcanic breath at a time. (sciencedaily.com)
As they decrease, the importance of persistent volcanic emissions rises. (sciencedaily.com)
I think warming up to 1945 was mainly driven by CO2, solar and low volcanic emissions. (realclimate.org)