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Castilleja de la Cuesta, nestled in the province of Seville within Andalusia, Spain, occupies a gently undulating terrain on the left bank of the Guadalquivir River. Its location, approximately 5 kilometers west of Seville city centre, places it within a significant urban-rural gradient. The elevation is relatively low, averaging around 30 meters above sea level, contributing to limited atmospheric dispersion. Historically an agricultural area, the surrounding landscape is now increasingly influenced by the expanding metropolitan area of Seville, with associated industrial and logistical developments. This proximity to a major urban centre and its associated infrastructure is a key determinant of air quality. The Guadalquivir River, while providing some natural ventilation, can also trap pollutants during periods of calm weather. The fertile Guadalquivir valley supports intensive agriculture, potentially contributing to ammonia emissions. The city’s urban character is a blend of traditional Andalusian architecture and modern residential developments, reflecting its growth as a commuter town. The prevailing winds, generally from the Atlantic, can transport pollutants from Seville and the industrial areas further afield, impacting local air quality. Understanding this interplay between agricultural practices, urban sprawl, and meteorological conditions is crucial for assessing and mitigating pollution in Castilleja de la Cuesta.

Air quality in Castilleja de la Cuesta exhibits a distinct seasonal pattern. Summer months (June-August) often see elevated ozone levels due to intense sunlight and high temperatures, exacerbated by the proximity to Seville’s urban heat island. Stagnant air masses and temperature inversions are common, trapping pollutants near the ground. Autumn (September-November) brings a slight improvement as temperatures cool, but increased agricultural activity, including harvesting and fertilizer application, can lead to higher ammonia concentrations. Winter (December-February) typically experiences the best air quality, with increased rainfall effectively washing pollutants from the atmosphere and stronger winds aiding dispersion. However, wood burning for heating in some households can contribute to particulate matter. Spring (March-May) is a transitional period, with fluctuating conditions. Pollen levels are high, impacting respiratory health, and the return of warmer temperatures can trigger ozone formation. Sensitive individuals, such as those with asthma or cardiovascular conditions, should be particularly cautious during summer and spring. Avoiding strenuous outdoor activity during peak ozone hours and monitoring local air quality reports are recommended. The Guadalquivir’s influence, creating localised humidity, can also affect pollutant dispersion.