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Sevilla, the vibrant capital of Andalusia in southern Spain, occupies a strategic position in the fertile Guadalquivir River valley, approximately 80 kilometers inland from the Atlantic Ocean. The city's geography profoundly influences its air quality through a combination of topographic, climatic, and anthropogenic factors. Situated at a modest elevation of just 7 meters above sea level, Sevilla lies within a broad alluvial plain surrounded by the Sierra Morena mountains to the north and the lower Subbaetic ranges to the southeast, creating a natural basin that can trap pollutants. The Guadalquivir River flows through the city, providing some atmospheric moisture but insufficient to regularly disperse accumulated contaminants. Sevilla's urban character as a major cultural and administrative center for over 1.1 million residents generates typical urban pollution sources—vehicle emissions, residential heating, and commercial activities—while its position within Andalusia's agricultural heartland means seasonal agricultural burning and dust from surrounding olive groves and cereal fields contribute particulate matter. The city's compact historic core with narrow streets exacerbates local pollution hotspots, while expanding suburbs create an urban-rural gradient where pollution disperses gradually toward the surrounding countryside. Proximity to the Atlantic moderates temperatures but doesn't provide consistent cleansing winds, making Sevilla's basin location particularly susceptible to pollution accumulation during stable atmospheric conditions.

Sevilla's air quality follows a distinct seasonal pattern shaped by its Mediterranean climate with continental influences. During winter (December-February), cooler temperatures increase residential heating emissions while frequent temperature inversions trap pollutants close to the ground, creating persistent haze; sensitive individuals should limit prolonged outdoor exposure on calm, cold mornings. Spring (March-May) brings variable conditions—occasional rainfall cleanses the atmosphere, but increasing agricultural activity and Saharan dust intrusions can spike particulate levels, particularly in April and May. Summer (June-August) presents a paradox: intense solar radiation creates ground-level ozone through photochemical reactions with vehicle emissions, peaking in July and August during afternoon heatwaves when vulnerable groups should avoid strenuous outdoor activities. Additionally, reduced rainfall and occasional stagnant air masses allow pollutants to accumulate despite holiday traffic reductions. Autumn (September-November) typically offers the cleanest air as temperatures moderate, Atlantic breezes return, and rainfall increases, making October and November ideal for outdoor activities. Throughout the year, wind patterns are crucial—easterly Levante winds can bring Saharan dust, while westerly Poniente winds from the Atlantic provide cleansing but are often weak in Sevilla's sheltered basin. Fog is rare but when it occurs in winter, it can combine with pollution to create health-adverse conditions.