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Canet-en-Roussillon, nestled in the heart of Occitanie, France, occupies a unique coastal position within the Roussillon plain, a gently sloping landscape bordering the Mediterranean Sea. Its coordinates (42.7067, 3.0078) place it strategically between the Pyrenees mountains to the north and the expansive coastline to the south. The city’s terrain is predominantly flat, characteristic of delta regions, facilitating urban sprawl and agricultural activity. Canet-en-Roussillon benefits from a relatively low elevation, averaging around 5 meters above sea level, which can influence local wind patterns and the potential for coastal fog formation. The surrounding landscape is a blend of cultivated fields – primarily vineyards and orchards – and the natural beauty of the Étang de Canet, a large coastal lagoon providing a vital habitat and recreational space. This lagoon acts as a partial barrier, moderating some wind impacts. The urban–rural gradient is gradual; Canet seamlessly transitions from residential areas to agricultural zones, with the coastline marking a distinct boundary. While not directly adjacent to major industrial belts, the proximity to Perpignan, a larger urban center with some industrial activity, and the broader Roussillon region’s agricultural sector, introduces potential sources of pollutants that can be transported by prevailing winds. The Mediterranean climate, with its warm, dry summers and mild, wet winters, significantly shapes the local microclimate and, consequently, the dispersion of airborne pollutants. The flat topography can sometimes exacerbate pollution episodes by limiting vertical mixing, particularly during periods of temperature inversion.

Canet-en-Roussillon’s air quality experiences a distinct seasonal rhythm dictated by its Mediterranean climate. Summers (June-August) are typically characterized by high temperatures and prolonged periods of sunshine, often accompanied by light, on-shore breezes. However, these conditions can also lead to temperature inversions, where a layer of warm air traps cooler air near the ground, hindering the vertical dispersion of pollutants. Agricultural activities, such as harvesting and pesticide application, can contribute to localized emissions during this period. Autumn (September-November) brings a gradual shift, with increased rainfall and more frequent wind events, generally improving air quality as pollutants are washed away and dispersed. Winter (December-February) often sees the formation of coastal fogs, particularly in the mornings, which can trap pollutants close to the ground, leading to temporary reductions in visibility and potential respiratory irritation. Spring (March-May) is generally the most pleasant season for air quality, with moderate temperatures, frequent rainfall, and consistent wind patterns that facilitate pollutant dispersal. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should exercise caution during summer months, particularly during periods of stagnant air or high temperatures. Avoiding strenuous outdoor activity during the hottest part of the day and monitoring local weather forecasts for inversion warnings is advisable. The lagoon’s presence can sometimes create localized humidity, which, combined with temperature inversions, can exacerbate the impact of pollutants.