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San Giovanni in Persiceto, nestled in the heart of Emilia-Romagna, Italy, occupies a geographically significant position within the Po Valley, a vast sedimentary basin stretching across northern Italy. Located approximately 17 kilometers south of Bologna, the city benefits from, and is also influenced by, the region's rich agricultural heritage and industrial activity. The terrain is predominantly flat, characteristic of the Po Valley, with gentle undulations marking the transition to the Apennine foothills to the south. Elevation averages around 28 meters above sea level, contributing to a tendency for air stagnation, particularly during periods of stable weather. The surrounding landscape is a patchwork of fertile farmland – primarily maize, wheat, and sunflowers – interspersed with pockets of woodland and small industrial zones. This agricultural intensity, while economically vital, can contribute to localized emissions of ammonia and particulate matter. The proximity to Bologna, a major urban and industrial hub, means San Giovanni in Persiceto experiences urban sprawl and the associated air pollution transport. The urban–rural gradient is relatively gradual, with residential areas blending seamlessly into agricultural land. The lack of significant natural barriers, such as mountains, allows for the widespread dispersion – or conversely, the concentration – of pollutants originating from both local sources and those carried by prevailing winds from the wider Po Valley. The Idice River flows nearby, offering some localized humidity but not significantly impacting regional air quality patterns. The valley's geological composition, largely composed of alluvial deposits, also influences the behaviour of pollutants in the atmosphere.

San Giovanni in Persiceto’s air quality follows a distinct seasonal pattern dictated by the region’s temperate climate and meteorological conditions. Winter months (December-February) typically experience the poorest air quality, largely due to temperature inversions. Cold, stable air becomes trapped near the ground, preventing vertical mixing and concentrating pollutants released from residential heating (wood burning is still common) and nearby industrial activity. Fog, frequent during this period, further exacerbates the problem by trapping particulate matter. Spring (March-May) sees a gradual improvement as temperatures rise, and wind speeds increase, facilitating pollutant dispersion. However, agricultural activities, including fertilizer application, can contribute to ammonia emissions. Summer (June-August) generally offers the best air quality, with warm temperatures and frequent convective mixing effectively diluting pollutants. However, occasional heatwaves can lead to stagnant conditions and ozone formation. Autumn (September-November) presents a transitional period. While wind patterns are generally favourable, the return of cooler temperatures can trigger localized inversions, and agricultural burning, though regulated, can still contribute to particulate matter. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should exercise caution during winter months, limiting outdoor exertion on days with visibly poor air quality. Spring and autumn require awareness of agricultural emissions, particularly near fields. During summer heatwaves, limiting strenuous activity during peak ozone hours is advisable. Overall, the city’s air quality is most predictable during the summer months, offering the greatest window for comfortable outdoor activities.