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Arenal volcano is the most active volcano in Costa Rica and has emitted at least 1.3Mt of SO2 since its reactivation in July 1968. Gas emissions from the volcano have been both by passive degassing and explosive eruptions, with passive degassing being dominant. Based on correlation spectrometry (COSPEC) measurements made during 1982, 1995 and 1996, the minimum average daily output is 130±60td−1 SO...