Ischia Air Quality Index (AQI)

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Ischia, a volcanic island in the Bay of Naples, Campania, Italy, presents a unique geographic context for air quality. The island’s terrain is dramatically varied, rising to the highest point of Mount Epomeo (789m) and sloping down to a coastline punctuated by beaches, coves, and cliffs. This elevation significantly influences local wind patterns and the potential for temperature inversions, trapping pollutants in the valleys. Ischia’s position within the Bay of Naples means it’s exposed to maritime influences, including sea breezes that can disperse pollutants, but also potentially transport them from the heavily populated mainland, particularly Naples and its industrial areas to the north. The surrounding landscape is a mix of Mediterranean vegetation – vineyards, olive groves, and pine forests – which contribute to biogenic volatile organic compounds (BVOCs), precursors to ozone formation. While Ischia is largely rural, increasing tourism and associated infrastructure development, particularly along the coast, contribute to localised emissions. The urban-rural gradient is steep, with denser settlements around Ischia Porto and Forio, and more sparsely populated, agricultural interiors. The island’s volcanic nature also means potential for geothermal emissions, though these are generally localised and monitored. The island’s topography creates microclimates, further complicating air circulation and pollutant distribution.

Ischia’s air quality follows a distinct seasonal pattern. Spring (March-May) sees a gradual improvement after the winter, with increased rainfall washing away accumulated pollutants. However, rising temperatures and increased sunlight trigger photochemical reactions, leading to ozone formation, particularly in April and May. Summer (June-August) is generally characterised by good air quality, thanks to consistent sea breezes and relatively low industrial activity due to the holiday season. However, high tourist numbers increase traffic and localised emissions around coastal towns. Autumn (September-November) often experiences stagnant air masses and temperature inversions, trapping pollutants, especially after the summer heat. Rainfall increases, offering some relief, but wood burning for heating begins, contributing to particulate matter. Winter (December-February) is typically the period of poorest air quality. Reduced sunlight limits photochemical activity, but increased wood burning for heating, combined with potential temperature inversions, leads to higher concentrations of particulate matter (PM2.5 and PM10). Sensitive groups – the elderly, children, and those with respiratory conditions – should limit strenuous outdoor activity during these colder months. Fog, common in winter, can exacerbate particulate pollution. Months to favour for outdoor activity are June, July and August, but even then, proximity to roads should be considered.