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Trecastagni, nestled on the slopes of Mount Etna in eastern Sicily, Italy, presents a unique geographic profile profoundly influencing its air quality. Situated at an elevation ranging from 500 to 700 meters above sea level (approximately 1640 to 2300 feet), the town enjoys panoramic views of the Ionian Sea and the surrounding fertile plains of the Catania province. Its location within the Etna volcanic region dictates a landscape characterized by volcanic soils, vineyards, citrus groves, and scattered chestnut forests. The urban character is distinctly Mediterranean, with narrow, winding streets and traditional stone buildings, reflecting a history rooted in agriculture and viticulture. Trecastagni’s regional position, close to the industrial hub of Catania, introduces a degree of urban influence, though the town itself retains a predominantly rural feel. The urban–rural gradient is relatively sharp; the immediate surroundings are agricultural, transitioning to steeper, forested slopes as one ascends towards Etna’s higher reaches. The proximity to the sea provides a moderating influence on temperature, but also introduces the potential for marine-borne pollutants. Prevailing winds generally blow from the northeast, carrying air masses across the Ionian Sea and up the slopes of Etna. Agricultural practices, particularly the use of fertilizers and pesticides, and occasional volcanic activity contribute to localized air quality variations. The terrain itself, with its steep slopes, can trap pollutants, especially during periods of calm weather, creating microclimates with potentially poorer air quality.

Trecastagni’s air quality experiences a distinct seasonal cycle dictated by meteorological patterns and agricultural activities. Spring (March-May) sees a gradual improvement as northerly winds strengthen, dispersing accumulated winter pollutants. However, agricultural burning, a traditional practice for land clearing and fertilization, can lead to localized spikes in particulate matter during this period. Summers (June-August) are generally characterized by stable atmospheric conditions and frequent high-pressure systems, which can lead to temperature inversions, trapping pollutants close to the ground, particularly in the evenings. The dry heat and reduced rainfall exacerbate this effect. August, in particular, can experience stagnant air. Autumn (September-November) brings a return to more dynamic weather patterns, with increased wind speeds and rainfall, which help to cleanse the atmosphere. However, the harvest season intensifies agricultural activity, potentially increasing emissions. Winter (December-February) often sees the most challenging air quality conditions. Cold, stable air masses combined with frequent fog and temperature inversions can trap pollutants, leading to prolonged periods of reduced visibility and elevated concentrations of fine particulate matter. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should limit outdoor exertion during these periods, especially in the early morning hours. Avoiding strenuous activity during the hottest summer afternoons is also advisable. The combination of volcanic emissions and seasonal agricultural practices means that air quality can fluctuate considerably, making awareness of local conditions crucial for public health.