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Bayeux, nestled in the heart of Normandy, France, occupies a gently undulating landscape approximately 15km inland from the English Channel. Its coordinates (49.2794, -0.7028) place it within a predominantly rural setting, though the city itself serves as a significant regional service centre. The terrain is characterised by low hills and fertile plains, historically shaped by glacial activity and fluvial erosion, particularly from the Aure and Drome rivers which converge nearby. This proximity to the coast introduces a maritime influence on the local climate, moderating temperatures and increasing humidity. Bayeux isn’t situated within a major industrial belt; rather, the surrounding area is dominated by agricultural land – primarily dairy farming and arable crops – which, while generally less polluting than heavy industry, can contribute to ammonia emissions. The urban-rural gradient is relatively sharp, with farmland immediately bordering the city limits. This means that prevailing winds can readily transport pollutants from agricultural activities into Bayeux, and conversely, urban emissions are quickly dispersed into the wider countryside. The city’s relatively low elevation (around 50-80m) doesn’t create significant thermal inversions, but coastal breezes can sometimes trap pollutants near the ground. The historical fabric of Bayeux, with its narrow streets and traditional building materials, also influences local air circulation patterns.

Air quality in Bayeux follows a distinct seasonal pattern, largely dictated by meteorological conditions and agricultural practices. Winter (December-February) typically sees the lowest pollution levels, due to reduced agricultural activity and stronger, more frequent winds dispersing emissions. However, wood burning for heating can elevate particulate matter, particularly on calm, cold days. Spring (March-May) brings increased agricultural activity – fertiliser application and livestock management – leading to a rise in ammonia and particulate matter. May is often a transitional month with fluctuating conditions. Summer (June-August) generally experiences good air quality, benefiting from prevailing westerly winds and ample sunshine, which aids in pollutant dispersion. However, heatwaves can exacerbate ozone formation. Autumn (September-November) is often the most challenging period. The harvest season intensifies agricultural emissions, and the return to heating systems contributes to particulate pollution. October and November frequently experience stagnant air masses and temperature inversions, trapping pollutants near the ground. Sensitive individuals – children, the elderly, and those with respiratory conditions – should limit strenuous outdoor activity during these autumn months. Fog, common in the autumn and winter, can also concentrate pollutants. Overall, spring and autumn require greater awareness of potential air quality issues.