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On February 1st 1994, the first COSPEC measurements were carried out at Popocatépetl volcano. Since the first measurements, the volcano showed very high emission rates. Along the last~ 20 years, measurements have been carried out using several modes (ground-static, ground-mobile, airborne-fixed wing, airborne-rotatory wing); trajectories (diagonal to, across, and along the plume); and during different activity episodes (passive degassing and effusive and explosive periods); as well as together with other instrumental developments and resources (DOAS, UV-cameras, MODIS, ASTER, OMI). Popocatépetl volcano has emitted nearly 40Mt of SO2 in~ 20years and has shown very large variations in the average emissions depending on the state of activity, having a maximum emission rate of~ 170 Kt in December 2000. This work shows a summary of results of the measurements obtained during this period …