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Spatial Distribution and Physicochemical Properties of Respirable Volcanic Ash From the 16–17 August 2006 Tungurahua Eruption (Ecuador), and Alveolar Epithelium Response In‐Vitro by Julia Eychenne; Lucia Gurioli; David Damby; Corinne Belville; Federica Schiavi; Geoffroy Marceau; Claire Szczepaniak; Christelle Blavignac; Mickael Laumonier; Emmanuel Gardés; Jean‐Luc Le Pennec; Jean‐Marie Nedelec; Loïc Blanchon; Vincent Sapin is a Environmental Science article available to read on EtoBox.

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## Abstract Tungurahua volcano (Ecuador) intermittently emitted ash between 1999 and 2016, enduringly affecting the surrounding rural area and its population, but its health impact remains poorly documented. We aim to assess the respiratory health hazard posed by the 16–17 August 2006 most intense eruptive phase of Tungurahua. We mapped the spatial distribution of the health‐relevant ash size fractions produced by the eruption in the area impacted by ash fallout. We quantified the mineralogy, composition, surface texture, and morphology of a respirable ash sample isolated by aerodynamic separation. We then assessed the cytotoxicity and pro‐inflammatory potential of this respirable ash toward lung tissues in‐vitro using A549 alveolar epithelial cells, by electron microscopy and biochemical assays. The eruption produced a high amount of inhalable and respirable ash (12.0–0.04 kg/m^2^ of sub‐10 μm and 5.3–0.02 kg/m^2^ of sub‐4 μm ash deposited). Their abundance and proportion vary greatly across the deposit within the first 20 km from the volcano. The respirable ash is characteristic of an andesitic magma and no crystalline silica is detected. Morphological features and surface textur

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Author

Julia Eychenne; Lucia Gurioli; David Damby; Corinne Belville; Federica Schiavi; Geoffroy Marceau; Claire Szczepaniak; Christelle Blavignac; Mickael Laumonier; Emmanuel Gardés; Jean‐Luc Le Pennec; Jean‐Marie Nedelec; Loïc Blanchon; Vincent Sapin

Publisher

American Geophysical Union (AGU)

Published

2022

Language

EN

Field

Environmental Science (Physical Sciences)