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Hendaye, nestled on the Bay of Biscay in the Nouvelle-Aquitaine region of France, occupies a unique and geographically sensitive position. As the westernmost town in France, it forms part of the Franco-Spanish border, directly opposite San Sebastián in Spain, creating a significant urban corridor. The city’s terrain is characterized by a gently sloping coastal plain, rising gradually towards the foothills of the Pyrenees Mountains to the north. This proximity to the mountains significantly influences local weather patterns and, consequently, air quality. The Bay of Biscay exerts a moderating influence on temperatures, but also introduces maritime influences like sea spray and occasional salt deposition. While Hendaye itself is primarily a residential and tourist town, it benefits from its connection to the wider Basque Country, an area with a mix of agricultural land (particularly vineyards and orchards) and light industrial activity concentrated further inland. The urban–rural gradient is relatively smooth, with smaller villages and agricultural areas interspersed along the coastal route. The prevailing winds generally blow from the northwest, carrying air masses across the Atlantic. However, during periods of high pressure, these winds can weaken, leading to stagnant air conditions, particularly in the sheltered valleys and coastal depressions. The relatively low elevation of Hendaye (averaging around 15 meters above sea level) means that pollutants, once trapped, can accumulate more readily than in higher-altitude locations. The surrounding landscape, a blend of sandy beaches, coastal dunes, and the looming presence of the Pyrenees, contributes to a complex microclimate that impacts air quality dynamics.

Hendaye’s air quality experiences a distinct seasonal rhythm dictated by meteorological factors. Summers, typically from June to August, are generally characterized by warm, sunny conditions and light, variable winds. While pleasant for outdoor activities, these periods can occasionally see stagnant air episodes, particularly during heatwaves, when temperature inversions trap pollutants close to the ground. The lack of consistent wind circulation allows for the build-up of emissions from local traffic and occasional agricultural burning in the surrounding areas. Autumn (September-November) brings increased rainfall and stronger, more consistent winds from the Atlantic, which generally disperse pollutants and improve air quality. However, periods of fog, common in October and November, can temporarily reduce visibility and trap particulate matter. Winters (December-February) are mild compared to many other parts of France, but can be damp and cloudy. Temperature inversions are more frequent during these months, leading to periods of poorer air quality, especially in the mornings. Spring (March-May) sees a gradual improvement in air quality as temperatures rise and winds increase. The return of flowering plants also contributes to pollen levels, which can affect sensitive individuals. For those with respiratory conditions, early spring and late summer are periods to be particularly mindful of outdoor exposure. Children and the elderly are also advised to limit strenuous activity during periods of stagnant air or high pollen counts. Regular monitoring of local weather forecasts and public health advisories is recommended to stay informed about potential air quality concerns.