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Alcudia, nestled on the northeastern coast of Mallorca, Balearic Islands, Spain, occupies a geographically significant position within the Mediterranean basin. The town itself is situated on a peninsula jutting into the Bay of Alcudia, a large, shallow bay providing a natural barrier against some prevailing winds. Its urban character is a blend of historic charm, with the walled Old Town dating back to the 14th century, and modern tourism infrastructure. The surrounding landscape is dominated by the Serra de Tramuntana mountains to the west, a UNESCO World Heritage site, and extensive agricultural plains to the south, primarily dedicated to citrus and almond cultivation. Alcudia’s terrain is relatively flat within the town itself, gradually rising towards the peninsula’s tip, offering panoramic views of the bay and coastline. The proximity to the Mediterranean Sea is a defining feature, influencing local climate and, crucially, air quality. The urban–rural gradient is relatively sharp; the town transitions quickly into agricultural land and then into the rugged mountainous terrain. While Alcudia itself lacks significant industrial zones, it benefits from, and is potentially impacted by, regional industrial activity concentrated further inland and on other Balearic Islands. The prevailing winds, generally from the west and northwest, often carry air masses from the mainland, potentially introducing pollutants. The bay’s topography can also lead to localized air stagnation under certain meteorological conditions, trapping pollutants close to the surface, particularly during periods of calm weather. The surrounding agricultural practices, while generally sustainable, can contribute to localized emissions of ammonia and particulate matter.

Alcudia’s air quality follows a distinct seasonal pattern dictated by the Mediterranean climate. Summers (June-August) are typically characterized by high temperatures and prolonged periods of sunshine, often accompanied by light, easterly winds. While these winds generally provide ventilation, the intense solar radiation can contribute to photochemical smog formation, particularly during stagnant periods. The dry conditions also increase the risk of dust suspension from agricultural activities. Spring (March-May) and Autumn (September-November) generally offer the most favourable air quality, with moderate temperatures and more frequent, stronger winds that disperse pollutants. However, autumn can occasionally experience episodes of Saharan dust intrusion, significantly reducing visibility and impacting respiratory health. Winters (December-February) are mild but can be punctuated by periods of fog, particularly in the mornings, which traps pollutants near the ground and can lead to localized air quality degradation. Temperature inversions, common during winter nights, further exacerbate this issue by preventing vertical mixing. Sensitive groups, such as children, the elderly, and individuals with respiratory conditions, should exercise caution during periods of Saharan dust events and fog. Outdoor activities are generally best enjoyed during spring and autumn, avoiding the hottest summer days and the potentially stagnant winter mornings. Agricultural burning, though regulated, can occasionally occur in the surrounding fields, contributing to short-term spikes in particulate matter. Awareness of local weather forecasts and air quality reports is crucial for making informed decisions about outdoor exposure.