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Plérin, nestled in the Côtes-d'Armor department of Brittany, France, occupies a geographically significant position within a gently undulating coastal plain. Located approximately 6 kilometers northeast of Saint-Brieuc, the city benefits from proximity to both the Atlantic Ocean and the Rance River estuary, influencing its microclimate and potential air quality dynamics. The terrain is characterized by low-lying hills and fertile agricultural land, transitioning from urban areas towards more rural landscapes. Elevation rarely exceeds 50 meters above sea level, minimizing the potential for significant topographic influences on air flow. The surrounding landscape is predominantly agricultural, with fields of cereals and pastureland interspersed with hedgerows and small woodlands. This agricultural activity, while vital to the regional economy, can contribute to localized emissions of ammonia and particulate matter, particularly during harvesting and fertilizer application. Saint-Brieuc, a larger urban center, exerts an influence on Plérin’s air quality, with potential for pollutants to be transported from the city’s industrial and traffic sources. The urban–rural gradient is relatively gradual, with Plérin exhibiting a mix of residential areas, small businesses, and agricultural holdings. The coastal location exposes the city to maritime influences, including sea breezes that can disperse pollutants, but also the potential for salt spray and episodic marine aerosol events. The prevailing westerly winds generally facilitate the movement of air masses away from the coastline, but local weather patterns can significantly alter this flow, creating pockets of stagnant air and localized pollution accumulation.

Plérin’s air quality experiences a distinct seasonal rhythm dictated by Brittany’s temperate maritime climate. Spring (March-May) sees a gradual improvement as temperatures rise and wind speeds increase, aiding in the dispersion of pollutants. However, agricultural activities intensify during this period, leading to potential spikes in ammonia levels from fertilizer use and livestock farming. Summer (June-August) typically offers the best air quality, with consistent sea breezes and generally sunny conditions. These breezes effectively ventilate the area, minimizing pollutant build-up. However, occasional heatwaves can lead to temperature inversions, trapping pollutants closer to the ground, particularly in the evenings. Autumn (September-November) marks a transition period. As temperatures cool, the frequency of temperature inversions increases, especially during calmer weather, potentially leading to localized pollution episodes. The harvest season also contributes to agricultural emissions. Winter (December-February) often presents the most challenging conditions. Frequent fog and low-lying cloud cover, combined with reduced wind speeds, can trap pollutants, particularly particulate matter. Damp conditions also limit the dispersion of pollutants. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should exercise caution during periods of fog and temperature inversions, limiting outdoor exertion and monitoring local air quality information. While generally good, awareness of these seasonal patterns allows for informed decisions regarding outdoor activities and personal health management.