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The measurement of volcanic gases, such as CO₂ and SO₂, emitted from summit craters and fumaroles is crucial to monitor volcanic activity, providing estimations of gases fluxes, and geochemical information that helps to assess the status and the risk level of an active volcano. During high degassing events, the measurement of volcanic emissions is a dangerous task that cannot be performed using hand portable or backpack carried gas analysis systems. Measurements of gases plumes could be safety achieved by using instruments mounted on UAS (Unmanned Aerial System). In this work, we present the measurements of CO₂, SO₂, and H₂S gases collected with a miniaturized MultiGAS instrument during 2021 and 2022 field campaigns. They took place at several thermally active areas in Italy: <i>Pisciarelli</i> (Naples, Italy), <i>Stromboli</i> volcano (<i>Messina</i>, Italy), and <i>Parco Naturalistico delle Biancane</i> (<i>Grosseto</i>, Italy).