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Casalgrande, nestled in the heart of Emilia-Romagna, Italy, occupies a gently rolling landscape within the Po Valley. Its coordinates (44.5898, 10.7394) place it within a predominantly agricultural region, historically known for its ceramics industry, which continues to contribute to the local economy. The terrain is characterised by low hills and fertile plains, a legacy of glacial activity and alluvial deposition from the nearby Secchia and Panaro rivers. This flat topography, while conducive to agriculture, unfortunately limits natural air dispersion. Casalgrande’s position within the Po Valley – one of Europe’s most densely populated and industrialised areas – is a critical factor influencing its air quality. The valley acts as a basin, prone to trapping pollutants, particularly during stable atmospheric conditions. The urban-rural gradient is relatively sharp; surrounding Casalgrande are extensive agricultural lands, interspersed with smaller towns and villages. While the agricultural activity itself contributes to particulate matter (PM) through farming practices, the proximity to larger industrial centres further north and west, like Modena and Reggio Emilia, introduces a complex mix of pollutants. The relatively low elevation (around 45 meters above sea level) further exacerbates the potential for stagnant air masses, impacting local air quality.

Casalgrande’s air quality follows a distinct seasonal pattern. Winter (December-February) typically sees the poorest air quality, driven by increased heating demand using biomass and fossil fuels, coupled with frequent temperature inversions. These inversions trap cold, dense air near the ground, preventing pollutants from dispersing. Fog, common in the Po Valley during winter, further concentrates particulate matter. Spring (March-May) offers a gradual improvement as temperatures rise and heating needs decrease, though agricultural activities like fertilisation can contribute to ammonia emissions. Summer (June-August) generally experiences the best air quality, aided by higher temperatures, increased wind speeds, and reduced heating. However, prolonged heatwaves can trigger photochemical smog formation, increasing ozone levels. Autumn (September-November) sees a deterioration as heating resumes and agricultural harvesting releases dust and other particles. October and November are often particularly problematic. Sensitive individuals – children, the elderly, and those with respiratory conditions – should limit strenuous outdoor activity during winter and autumn months. Monitoring pollen levels is also crucial in spring. Avoiding peak traffic hours and staying informed about local air quality reports are recommended year-round.