Dieppe Air Quality Index (AQI)

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Dieppe, nestled in the Normandy region of France at coordinates 49.9250° N, 1.0750° E, is a port city profoundly shaped by its coastal geography. Situated at the mouth of the Arques River, the city occupies a relatively low-lying terrain, rising gently inland from the English Channel. This proximity to the sea exerts a significant influence on local weather patterns and, consequently, air quality. The surrounding landscape is a mix of agricultural land – primarily pasture and arable farming – and chalk cliffs, characteristic of the Normandy coastline. While Dieppe itself isn’t heavily industrialised, the broader Seine Estuary region to the east contains industrial activity, potentially contributing to long-range pollutant transport. The urban-rural gradient is relatively sharp; the city centre transitions quickly to open countryside. The prevailing winds, typically from the southwest, carry maritime air, which can be clean but also contribute to high humidity and fog formation. The city’s position within a bay means pollutants can sometimes become trapped, especially during calm weather conditions. The port itself, handling both commercial and ferry traffic, is a localised source of particulate matter and nitrogen oxides. Understanding these geographical factors is crucial for interpreting Dieppe’s air quality profile.

Dieppe’s air quality follows a distinct seasonal pattern. Winter (December-February) often sees poorer air quality due to increased residential heating, particularly wood burning, and temperature inversions trapping pollutants near the ground. Calm, damp conditions exacerbate this, with fog frequently reducing dispersion. Spring (March-May) brings improvement as temperatures rise and winds become more frequent, flushing out accumulated pollutants. However, agricultural activities, such as fertiliser application, can contribute to ammonia levels. Summer (June-August) generally offers the cleanest air, benefiting from strong sea breezes and higher temperatures promoting pollutant dispersion. However, increased tourist activity and ferry traffic can locally elevate emissions. Autumn (September-November) sees a gradual decline in air quality as heating demand increases and meteorological conditions become more stable. October and November are often the most polluted months. Sensitive individuals – those with respiratory conditions, the elderly, and young children – should be particularly cautious during winter and autumn. Avoiding strenuous outdoor activity on still, cold days is advisable. Monitoring local forecasts and limiting exposure during peak pollution periods is recommended for all.