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              <p>Passive volcanic degassing results in the emission of toxic gases such as H 2 S at quasi-steady rates over long periods that pose a significant hazard to human health even in low gas concentrations. Currently, La Soufrière de Guadeloupe has one of the highest gas emission rates in the Lesser Antilles arc, with gas emitted mainly from low-temperature fumaroles. In this study, gas dispersion from the volcano between 2016 and 2021 was modelled using a numerical code that takes into account wind and atmospheric data, topography, and gas flux measurements. We ran c.100 individual simulations of the most frequently observed wind and gas flux conditions using a Monte Carlo scheme. Our results, validated using air-quality measurements and citizenscience surveys, show that the most exposed zones are the hamlet of Matouba and the upper St. Claude. These areas have a 20 % and a 5 % probability, respectively, of exceeding H 2 S guidelines for long-term gas exposure (70 ppb).</p>
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              <p>Le dégazage volcanique passif émet des gaz toxiques tels que l'H 2 S sur de longues périodes, ce qui représente un risque important pour la santé, même pour des faibles teneurs en gaz. Actuellement, La Soufrière de Guadeloupe émet des flux de gaz les plus élevés de l'arc des Petites Antilles, via des fumerolles de basses températures. Ici, nous étudions la dispersion des gaz de ce volcan entre 2016 et 2021 via la modélisation numérique en prenant en compte les données atmosphériques, la topographie et les mesures de flux de gaz. C.100 simulations ont été effectuées avec les conditions le plus fréquement observées. Nos résultats, validés par des mesures de qualité de l'air et par des retours de citoyens, suggèrent que les zones les plus exposées sont le hameau de Matouba et les hauteurs de Saint-Claude où il y a respectivement 20 % et 5 % de probabilité de dépasser les recommandations pour l'exposition long-terme à l'H 2 S (70 ppb).</p>
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