The general assembly of the EGU (European Geosciences Union) took place between the 23rd and the 28th of April 2023, in which two works within the scope of the SONDA project were presented, one with the title “Periodical behaviour of air CO2 time series after Cumbre Vieja volcanic eruption“, on the periodicity of CO2 emissions after the volcano of Cumbre Vieja, in the town of Puerto Naos on the island of La Palma in the Canaries, and the other with the title “Ground-based volcanic ash detection with low-cost sensors – a case study at the 2021 Cumbre Vieja eruption” on the detection of ash using low-cost and easy-to-implement sensors.