Abstract Volcanic degassing, rich in sulfur dioxide (SO2), is a crucial indicator for detecting any modification of the volcanic activity associated to subsurface magmatic processes. Furthermore, sulfate aerosols, produced from SO2 oxidation in the atmosphere, significantly modify the Earth atmospheric chemistry and radiative budget. Their long-range transport can degrade air quality over continental scales (Boichu et al., ACP 2019). Injected into the stratosphere by major explosive eruptions, SO2 gas emissions also have a direct impact on climate (Boichu et al., JGR 2023). When available, ground observations, based on UV-DOAS spectroscopy, are sensitive to moderate degassing. However, the vast majority of active volcanoes are not instrumented for gas monitoring from the ground. Thanks to hyperspectral sensors offering a high spatial resolution such as Sentinel-5P/TROPOMI, monitoring volcanic degassing from space has made considerable progress in the past years (Theys et al. 2019). To ...