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Cartaya, nestled in the province of Huelva, Andalusia, Spain, occupies a geographically significant position within the Guadalquivir River Valley. Its coordinates (37.2833, -7.1500) place it relatively close to the Atlantic coast, approximately 15 kilometers inland, influencing local weather patterns and, consequently, air quality. The terrain is predominantly flat, characteristic of the coastal plains of Andalusia, with gentle undulations marking the transition towards the foothills of the Sierra de Huelva to the north. This flatness, while facilitating urban expansion, can also contribute to the stagnation of air pollutants, particularly during periods of low wind. The surrounding landscape is a mosaic of agricultural land – primarily dedicated to intensive strawberry and vegetable farming – and areas of pine forest, typical of the region’s Mediterranean ecosystem. The proximity to the Tinto River, historically impacted by mining activities, presents a potential, albeit currently mitigated, source of localized pollutants. Cartaya’s urban-rural gradient is relatively smooth; the town blends seamlessly into the agricultural landscape, with smaller villages and rural settlements dotting the surrounding countryside. The region’s industrial activity is concentrated further east, around Huelva city, but transportation corridors connecting Cartaya to these industrial zones can still introduce pollutants. Elevation is low, averaging around 30 meters above sea level, minimizing the natural dispersion of airborne particles. The Guadalquivir Valley’s topography, acting as a broad basin, can trap pollutants, especially when coupled with stable atmospheric conditions.

Cartaya’s air quality exhibits a distinct seasonal pattern dictated by the region’s Mediterranean climate. Summers (July-August) are typically hot and dry, characterized by prolonged periods of sunshine and minimal rainfall. This often leads to temperature inversions, where a layer of warm air traps cooler air near the ground, hindering the vertical mixing of pollutants and resulting in elevated concentrations of particulate matter and ozone. Agricultural activities, including pesticide application and soil tilling, also contribute to summer pollution. Spring (April-May) and Autumn (September-October) generally offer the most favourable air quality, with moderate temperatures, increased rainfall, and more frequent wind events that help disperse pollutants. However, agricultural burning, a traditional practice in some areas, can occasionally lead to localized spikes in smoke and particulate matter during these transitional seasons. Winters (November-February) are relatively mild but can be affected by occasional fog, particularly in the mornings. Fog traps pollutants near the ground, reducing visibility and increasing exposure. The prevalence of agricultural land surrounding Cartaya means that dust from tilled fields can become a significant factor, especially during drier periods. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should limit outdoor activity during periods of stagnant air, particularly during the hot summer months and on foggy winter mornings. Maintaining awareness of local weather forecasts and agricultural practices is crucial for minimizing exposure and protecting respiratory health.