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Huelva, nestled in Andalusia, Spain, occupies a geographically significant position at the mouth of the Tinto River, where it meets the Gulf of Cádiz. Its coordinates (37.2500, -6.9500) place it on a relatively low-lying coastal plain, averaging around 20 meters above sea level. The city’s terrain is gently undulating, transitioning from the riverine plain to slightly higher ground towards the interior. This coastal location, while offering maritime benefits, presents unique challenges for air quality. To the north, the landscape rises into the foothills of the Sierra de Aracena and Picos de Aroche Natural Park, a region characterized by dense forests and cork oak plantations. This proximity to a significant forested area can, under certain conditions, contribute to particulate matter from biomass burning, particularly during agricultural practices. Southward, the landscape opens to the Atlantic Ocean, influencing prevailing winds and coastal breezes. Huelva’s industrial belt, historically centered around mining (particularly copper and pyrite) and related processing activities, is located to the northwest, impacting local air quality. The urban–rural gradient is relatively gradual, with agricultural land – olive groves and vineyards – extending outwards from the city limits. The Tinto River itself, historically impacted by mining runoff, can influence local air quality through the release of volatile compounds, although remediation efforts are ongoing. The Gulf of Cádiz’s influence moderates temperatures but can also trap pollutants under stable atmospheric conditions, especially during periods of high pressure. The surrounding landscape, a mix of forest, agriculture, and industrial zones, directly shapes Huelva’s air quality profile.

Huelva’s air quality exhibits a distinct seasonal pattern dictated by its Mediterranean climate and regional weather systems. Summers (July-August) are typically characterized by high temperatures and prolonged periods of anticyclonic conditions, leading to temperature inversions. These inversions trap pollutants near the ground, potentially exacerbating issues related to industrial emissions and vehicle traffic. While coastal breezes offer some ventilation, their effectiveness is reduced during these stagnant periods. Spring (April-May) and Autumn (September-October) generally offer the most favourable air quality, with moderate temperatures and more frequent wind patterns that disperse pollutants. However, agricultural burning practices in the surrounding rural areas during these seasons can contribute to particulate matter spikes. Winters (November-March) bring increased rainfall, which helps to cleanse the atmosphere, but can also be associated with periods of fog, particularly in the river valleys, which can trap pollutants. The influence of the Atlantic Ocean is most pronounced during winter, bringing cooler, wetter conditions and generally improved air quality. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should be particularly cautious during summer months and periods of agricultural burning. Outdoor activities are generally best enjoyed during spring and autumn, avoiding peak traffic hours. While the coastal location provides some natural ventilation, awareness of local weather conditions and potential pollution sources is crucial for protecting respiratory health throughout the year. Periods of prolonged drought can also worsen air quality by increasing dust levels.