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Alessandria, nestled in the Piedmont region of northwestern Italy, occupies a strategically significant location within the Po Valley, a vast alluvial plain bordered by the Alps to the north and the Apennine Mountains to the south. Its coordinates (44.9133, 8.6200) place it relatively close to the border with France, influencing its cultural and economic ties. The city sits at an elevation of approximately 218 meters (715 feet) above sea level, contributing to a generally flat terrain, typical of the Po Valley. The Bormida River flows through Alessandria, historically shaping its urban layout and providing a crucial water source. The surrounding landscape is a mosaic of fertile agricultural land, primarily dedicated to rice cultivation and vineyards, characteristic of Piedmont’s renowned wine production. To the west, the undulating hills of Monferrato begin to rise, offering a visual contrast to the flat valley floor. Historically, Alessandria’s location has made it a vital transportation hub, with road and rail networks converging here. This has also led to industrial development, particularly in sectors related to agriculture and processing, though the city itself maintains a relatively moderate industrial footprint compared to larger Italian urban centers. The urban–rural gradient transitions smoothly, with agricultural fields and smaller villages surrounding Alessandria, minimizing abrupt shifts in land use. The Po Valley's topography, however, presents a challenge for air quality, as the flat expanse can trap pollutants, especially during periods of atmospheric stability. The proximity to agricultural zones also introduces specific pollutants related to farming practices.

Alessandria’s air quality experiences a distinct seasonal cycle heavily influenced by meteorological patterns. Winter months (December-February) often see the most challenging conditions. Temperature inversions, common in the Po Valley due to cold, dense air settling in the basin, trap pollutants close to the ground, exacerbating emissions from residential heating (often using solid fuels) and limited industrial activity. Fog, frequently occurring during these months, further reduces dispersion. Spring (March-May) brings a gradual improvement as temperatures rise, and wind speeds increase, aiding in pollutant dispersal. Agricultural activities, including fertilizer application, can introduce ammonia into the air, though generally not to a significant degree. Summer (June-August) typically offers the best air quality, with consistent sunshine, higher temperatures, and frequent convective mixing that effectively dilutes pollutants. However, occasional heatwaves can lead to stagnant air and ozone formation. Autumn (September-November) presents a transitional period. While wind patterns are generally favorable, the return of cooler temperatures can trigger temperature inversions, particularly in October and November, leading to periods of reduced air quality. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should be particularly cautious during winter and early spring, limiting outdoor exertion during periods of stagnant air. During summer, while generally good, prolonged heatwave conditions warrant similar precautions. Maintaining indoor air quality through ventilation and air purification can be beneficial during periods of elevated pollution.