1 Introduction

Located in Central Mexico and in the vicinity of highly populated urban centers, Popocatépetl is an active stratovolcano only 50 km SE from the Mexico City Metropolitan Area (MCMA) and 30 km SW from Puebla. Large pyroclastic flows have reached the MC...

1.1 Site, instrument, and measurements

Our measurements are taken from the Altzomoni Atmospheric Observatory (19.1187°N, 98.655°W, 3,985 m a.s.l.) using a high-resolution FTIR spectrometer from Bruker, model IFS HR120/5, that contributes to NDACC (De Mazière et al., 2018). The high-altitude st...