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A PM1 geochemical and mineralogical study using Scanning ElectronMicroscopy (SEM) was performed on a pilot site in the Agri Valley which isclose to the oil pre-treatment plant (C.O.V.A) of Europe's largeston-shore hydrocarbon reservoir. The study identified PM1 geochemicaland mineralogical characters in the period before, during and immediatelyafter a burning torch flare event. The finer fraction (DFe < 0.7 <abbr>μm</abbr>)consisted mainly of secondary particles and soot. In thecoarser fraction (DFe ≥ 0.7 <abbr>μm</abbr>), natural particlesoriginating from crustal erosion and soot were abundant. Fine quartzparticles and lower Al / Si ratios are markers for desert dust origin, provingthat a Saharan dust episode which occurred during the observation periodplayed a significant role in supplying geogenic aerosol components to thePM1. Largest amounts of ≥ 0.7 <abbr>μm</abbr> fraction particles observedon the day of flare event may be due to a greater supply of Saharan geogenicparticles. Soot had been significantly increasing long before the flareevent, suggesting that this increase is also related to other causes,although we cannot exclude a contribution from flaring. S-rich aerosolconsisted mainly of mixed particles originating from deposition andheterogeneous nucleation of secondary sulfates on mineral dust. Only-Sparticles were identified in the ≥ 0.7 <abbr>μm</abbr> fraction following theflare event. These particles may be indicators of larger amounts of sulphurin the atmosphere

natural hazards and earth system sciences

PM&amp;lt;sub&amp;gt;1&amp;lt;/sub&amp;gt; geochemical and mineralogical characterization using SEM-EDX to identify particle origin – Agri Valley pilot area (Basilicata, southern Italy)