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San Severo, situated in the heart of the Tavoliere delle Puglie, serves as a pivotal agricultural and cultural hub in the province of Foggia. Positioned at an elevation of approximately 86 meters above sea level, the city occupies a flat, expansive plain that stretches toward the Adriatic Sea to the east and the Daunian Mountains to the west. This unique topographical placement creates a distinct urban-rural gradient where the dense, limestone-rich historic center transitions abruptly into vast, monocultural wheat fields and sprawling olive groves. The city’s geography is defined by its inland position, which shields it from the immediate maritime influence of the coast while exposing it to the continental climate of the Foggiano plain. From an air quality perspective, San Severo’s location is a double-edged sword. The flat terrain facilitates excellent air circulation, often assisted by the prevailing winds that sweep across the Tavoliere. However, the absence of significant physical barriers means that particulate matter and agricultural emissions—particularly those arising from seasonal crop burning or intensive machinery use—can become trapped or circulated widely across the basin. Furthermore, the proximity to major regional transit corridors, including the A14 motorway and primary state roads, introduces vehicular exhaust into the urban atmosphere. These transport arteries act as conduits for pollutants that congregate within the city's periphery. The surrounding landscape, dominated by intensive agricultural practices, dictates the micro-climatic conditions and particulate loading, ensuring that San Severo remains sensitive to both localized industrial activity and the regional atmospheric dynamics inherent to the Puglia plateau.

San Severo experiences a Mediterranean climate with distinct seasonal variations that profoundly influence local air quality. During the spring and summer months, the city enjoys frequent sunshine and higher temperatures, which typically aid in the vertical dispersion of pollutants. However, the summer heat can sometimes lead to ozone formation, particularly during stagnant high-pressure systems that settle over the Tavoliere plain. Residents should favor early morning hours for outdoor exercise during these months, as afternoon peak temperatures can coincide with higher concentrations of ground-level pollutants. As autumn arrives, the meteorological profile shifts significantly. Cooler temperatures and increased humidity often lead to thermal inversions, where cold air is trapped near the ground, preventing the dispersal of vehicle emissions and biomass smoke from residential heating. This trend intensifies throughout the winter. December and January are characterized by frequent fog and light winds, which act to compress atmospheric pollutants close to the urban surface. During these colder months, sensitive groups, including those with respiratory conditions like asthma or chronic obstructive pulmonary disease, are advised to monitor local air quality reports carefully and limit intense physical exertion during stagnant weather windows. The cycle concludes as spring winds return, flushing the atmosphere and improving visibility. While San Severo generally benefits from the cleansing effect of regional wind patterns, the winter months remain the most challenging period for air quality. By understanding these seasonal rhythms, inhabitants can better navigate the urban environment, opting for indoor activities during peak inversion days while embracing the cleaner, breeze-swept days of the transitional seasons.