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Benisa, nestled in the Valencia region of Spain at coordinates 38.7150, 0.0500, presents a unique geographic setting influencing its air quality. The municipality is situated on the Costa Blanca, a coastal stretch renowned for its mild climate and dramatic landscapes. Benisa’s terrain is characterised by a transition from the mountainous interior to the Mediterranean coastline, creating a varied topography with hills and valleys. This undulating landscape can trap pollutants during periods of calm weather. The town itself is approximately 3km inland from the sea, benefitting from coastal breezes but also susceptible to marine air masses carrying salt and potentially pollutants from shipping lanes. Surrounding Benisa are extensive citrus groves and vineyards, typical of the Valencian agricultural landscape. While these contribute to the region’s economy and aesthetic appeal, agricultural practices can introduce particulate matter from dust and pesticide application. The urban-rural gradient is relatively sharp, with Benisa’s built-up areas contrasting with the surrounding agricultural land and natural parks like the Serra de Bernia. The proximity to larger urban centres like Denia and Calpe also means Benisa can experience pollutant transport from these areas, particularly during specific weather conditions. The prevailing winds, generally from the east, play a crucial role in dispersing or concentrating these pollutants.

Benisa’s air quality follows a distinct seasonal pattern, closely tied to meteorological conditions and human activity. Summer months (June-August) typically experience better air quality, driven by consistent sea breezes that dilute pollutants and higher temperatures promoting atmospheric mixing. However, increased tourist activity and associated traffic can locally elevate nitrogen dioxide levels. Autumn (September-November) sees a gradual deterioration as temperatures fall and the likelihood of temperature inversions increases, trapping pollutants in the valleys. These inversions, where a layer of warm air sits above cooler air, are particularly common in October and November. Winter (December-February) is often the period of poorest air quality, with reduced sunlight, lower wind speeds, and increased wood burning for heating in rural areas contributing to particulate matter concentrations. Fog, a frequent occurrence during winter mornings, can exacerbate these conditions. Spring (March-May) marks a transition, with improving conditions as temperatures rise and rainfall helps to cleanse the atmosphere. Sensitive individuals, such as those with respiratory conditions, should be particularly cautious during winter and autumn months, limiting strenuous outdoor activity on still days. Monitoring pollen levels is also important during spring due to the region’s abundant vegetation.