San Juan de Aznalfarache Air Quality Index (AQI)

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San Juan de Aznalfarache, nestled in the province of Andalusia, Spain, occupies a strategic yet challenging geographical position. Situated on the left bank of the Guadalquivir River, just southwest of Seville, the city’s terrain is predominantly flat, characteristic of the Guadalquivir Valley. This low elevation, averaging around 15 meters above sea level, contributes to potential air stagnation. Historically an agricultural area, the urban–rural gradient is increasingly blurred as Seville’s metropolitan area expands, with San Juan de Aznalfarache becoming a key residential and industrial suburb. The proximity to Seville’s industrial zones, particularly to the north and east, introduces a significant source of potential pollutants. The Guadalquivir River, while providing a vital transport corridor, can also trap pollutants during periods of low flow and temperature inversions. Surrounding the city are agricultural lands, primarily dedicated to citrus fruits and vegetables, which, while contributing to the local economy, can generate particulate matter from agricultural practices and seasonal burning. The city’s location within the Baetic Depression influences its climate, leading to hot, dry summers and mild, wet winters, impacting pollutant dispersion patterns. The lack of significant topographical features to promote ventilation exacerbates air quality concerns.

San Juan de Aznalfarache experiences a distinct seasonal air quality narrative. Summer (June-August) often sees elevated ozone levels due to intense sunlight and high temperatures reacting with vehicle emissions. While winds can offer some relief, periods of calm can lead to pollutant build-up. Autumn (September-November) brings a shift, with increased particulate matter from agricultural burning and the onset of heating systems. November is often the month with the poorest air quality. Winter (December-February) is generally better, with increased rainfall washing pollutants from the air and stronger winds aiding dispersion, though temperature inversions can trap pollutants near the ground. February tends to be the cleanest month. Spring (March-May) sees a gradual increase in pollen and dust, alongside rising temperatures and increased activity. March can be problematic due to agricultural activity. Sensitive groups – children, the elderly, and those with respiratory conditions – should limit strenuous outdoor activity during peak summer ozone days and periods of agricultural burning in autumn. Monitoring wind direction is crucial; winds from the north and east often carry pollutants from Seville’s industrial areas. Staying indoors during stagnant conditions is advisable.