Granville Air Quality Index (AQI)

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Granville, nestled on the rugged coastline of Normandy, France, occupies a unique and geographically significant position. Situated at coordinates 48.8374, -1.5939, the town’s urban fabric is inextricably linked to its dramatic coastal setting. The terrain is characterized by a blend of steep cliffs, sandy beaches, and a natural harbour, a legacy of its historical importance as a port. Granville’s elevation varies considerably, rising from sea level along the shoreline to higher ground inland, influencing local wind patterns and microclimates. The surrounding landscape is predominantly rural, comprising rolling farmland and hedgerows typical of the Normandy countryside, gradually transitioning to a more urban–rural gradient as one moves away from the town centre. This proximity to agricultural zones introduces potential sources of ammonia and particulate matter, particularly during harvest seasons. The town’s location on the Channel coast exposes it to maritime influences, including sea breezes that can disperse pollutants, but also to salt spray and occasional episodes of marine aerosol deposition. Historically, Granville’s harbour facilitated trade and fishing, and while industrial activity is now limited, the legacy of past maritime industries and ongoing port operations contribute to localized air quality considerations. The town’s relatively small population (12,799) means that urban emissions are less concentrated than in larger metropolitan areas, but the coastal geography still plays a crucial role in shaping its air quality profile, often moderating pollution levels through natural ventilation.

Granville’s air quality experiences a distinct seasonal rhythm dictated by meteorological conditions and regional patterns. Spring (March-May) typically sees a gradual improvement in air quality as temperatures rise and wind speeds increase, dispersing any lingering winter pollutants. However, agricultural activities intensify during this period, potentially leading to elevated ammonia levels from fertilizer application and livestock farming in the surrounding countryside. Summer (June-August) generally offers the best air quality, with consistent sea breezes providing excellent ventilation. The warmer temperatures and increased sunlight also promote photochemical reactions, which can occasionally lead to ozone formation, though this is usually localized and short-lived. Autumn (September-November) marks a shift, with decreasing daylight hours and a greater frequency of temperature inversions, particularly during calmer periods. These inversions trap pollutants near the ground, potentially leading to poorer air quality, especially in the mornings. November often sees increased dampness and fog, further exacerbating this effect. Winter (December-February) is typically the most challenging season. Cold, stable air masses frequently settle over the region, creating persistent temperature inversions and reducing wind speeds. This combination can lead to a build-up of pollutants, particularly particulate matter from domestic heating sources. Sensitive groups, such as the elderly, children, and individuals with respiratory conditions, should limit prolonged outdoor exposure during periods of stagnant air and reduced visibility. During the autumn and winter months, checking local weather forecasts for inversion warnings is advisable, and opting for indoor activities on days with poor air quality is recommended.