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Benidorm, nestled on the Costa Blanca of the Valencia region in Spain (38.5342° N, -0.1314° W), presents a unique geographic setting influencing its air quality. The city is dramatically situated between low, coastal mountains – the Serra Gelada – and the Mediterranean Sea. This terrain creates a microclimate, sheltering Benidorm from some northerly winds but also potentially trapping pollutants during temperature inversions. The immediate surrounding landscape is characterised by a steep urban-rural gradient; high-rise buildings dominate the coastal strip, rapidly transitioning to pine forests and scrubland as one moves inland and uphill. Benidorm’s elevation ranges from sea level to approximately 160 meters in the surrounding hills. While not directly within a major industrial belt, the wider Valencia region has agricultural activity – primarily intensive horticulture – which contributes to ammonia emissions, a precursor to particulate matter formation. The proximity to the sea provides a source of sea salt aerosols, impacting particulate composition. The city’s dense urban form, with limited green spaces in the core, exacerbates the urban heat island effect, potentially increasing ground-level ozone formation during summer months. The prevailing winds are generally from the east, carrying marine influences, but local wind patterns are significantly affected by the topography.

Benidorm’s air quality follows a distinct seasonal pattern. Winter (December-February) generally experiences the best air quality, benefiting from prevailing westerly winds that disperse pollutants and increased rainfall which effectively scrubs the atmosphere. However, temperature inversions, common during calm winter nights, can trap pollutants in the coastal valleys. Spring (March-May) sees a gradual increase in pollution as tourism begins to rise and agricultural activity intensifies, releasing ammonia. Summer (June-August) is often marked by elevated ozone levels due to intense sunlight and high temperatures, particularly during periods of stagnant air. The dry conditions also increase the risk of wildfires in the surrounding hills, contributing to particulate matter. Autumn (September-November) sees a return to more favourable conditions, with increased rainfall and cooler temperatures, though occasional episodes of Saharan dust intrusion can significantly degrade air quality. Sensitive groups – those with respiratory conditions, the elderly, and young children – should be particularly cautious during summer months and periods of Saharan dust. Avoiding strenuous outdoor activity during peak ozone hours (midday to late afternoon) in summer is advisable. Monitoring local forecasts for dust alerts is crucial.