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Niscemi, nestled in the heart of southeastern Sicily, Italy, occupies a geographically significant position within the Gela Plain, a fertile agricultural region. Its coordinates (37.1500, 14.3833) place it approximately 10 kilometers inland from the Mediterranean Sea, a factor influencing local climate and, consequently, air quality. The terrain is predominantly flat, characteristic of the plain, with gentle undulations marking the transition to the Hyblaean Mountains to the south. This flat topography, while beneficial for agriculture, can exacerbate air pollution episodes as it limits natural dispersion of pollutants. Niscemi’s urban character is that of a developing town, transitioning from a primarily agricultural hub to a more diversified economy. Surrounding the town are extensive olive groves, citrus orchards, and vineyards, contributing to a strong rural influence and occasional agricultural burning, particularly during harvest seasons. The urban–rural gradient is relatively smooth, with scattered farmhouses and agricultural fields blending seamlessly into the town’s periphery. The proximity to the industrial zone of Gela, located further west along the coast, is a crucial consideration. While not directly adjacent, industrial emissions can be transported eastward by prevailing winds, impacting Niscemi’s air quality. The Mediterranean climate, with hot, dry summers and mild, wet winters, further shapes the local atmospheric conditions. Elevation is relatively low, averaging around 150 meters above sea level, minimizing the potential for orographic lift and influencing temperature inversions. The surrounding landscape, dominated by agricultural land and the distant mountains, plays a role in trapping pollutants under certain meteorological conditions.

Niscemi’s air quality experiences a distinct seasonal cycle dictated by the Mediterranean climate and local activities. Summer, spanning June to August, typically presents the most challenging conditions. High temperatures and prolonged periods of sunshine lead to increased photochemical smog formation, driven by sunlight reacting with pollutants from agricultural activities and potential industrial sources. The lack of significant rainfall during these months allows pollutants to accumulate. Conversely, winter (December to February) generally offers improved air quality. Increased rainfall effectively washes pollutants from the atmosphere, and cooler temperatures reduce photochemical reactions. However, temperature inversions, common during winter nights, can trap pollutants near the ground, leading to localized episodes of poor air quality. Spring (March to May) and autumn (September to November) represent transitional periods. Spring sees a gradual increase in temperatures and sunlight, potentially leading to rising pollution levels, while autumn brings cooler temperatures and more frequent rainfall, generally improving air quality. Agricultural burning, a traditional practice for land clearing and crop residue disposal, is most prevalent in late autumn and early spring, significantly impacting local air quality during these periods. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should exercise caution during summer months and be aware of potential pollution episodes during winter inversions. Outdoor activities are generally best enjoyed during the wetter months of winter and the milder conditions of spring and autumn, avoiding peak agricultural burning times.