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Seynod, nestled within the Auvergne-Rhône-Alpes region of France, occupies a geographically significant position at the foot of the French Prealps, approximately 10 kilometers northeast of Annecy. Its coordinates (45.8897, 6.0967) place it within a valley landscape characterized by rolling hills and a gradual ascent towards the mountains. The city’s terrain is moderately undulating, with elevations ranging from around 440 to 550 meters above sea level. This elevation, combined with the valley setting, can contribute to localized air quality challenges, particularly during periods of temperature inversion. Seynod benefits from proximity to Lake Annecy, a large freshwater body that can influence local weather patterns and, to a lesser extent, air circulation. The surrounding landscape is a blend of agricultural land – vineyards and orchards are common – and forested slopes, typical of the Savoie region. The urban–rural gradient is relatively sharp; Seynod transitions quickly from a residential area to agricultural fields and then to the foothills of the Alps. While not directly adjacent to major industrial belts, it’s within reasonable commuting distance of Annecy and other regional industrial centers, potentially exposing it to pollutants transported by prevailing winds. The valley’s topography can trap pollutants, especially when wind speeds are low, creating conditions conducive to poor air quality episodes. The microclimate is influenced by the lake and the mountains, resulting in cooler temperatures and higher humidity compared to more exposed areas.

Seynod’s air quality experiences a distinct seasonal cycle heavily influenced by its alpine setting. Spring (March-May) sees a gradual improvement as temperatures rise and snowmelt increases humidity, aiding in pollutant dispersion. However, early spring can still be affected by lingering temperature inversions, trapping cold air and pollutants near the ground. Summer (June-August) generally offers the best air quality, with consistent sunshine, higher wind speeds, and convective mixing that effectively dilutes pollutants. Agricultural activities, however, can contribute to particulate matter from field operations. Autumn (September-November) marks a shift towards poorer air quality. As temperatures cool, the likelihood of temperature inversions increases, particularly during clear, calm nights. Wood burning for heating becomes more prevalent, adding to particulate pollution. The surrounding forests also contribute to biogenic volatile organic compounds (BVOCs), which can react with other pollutants to form ozone. Winter (December-February) typically presents the most challenging air quality conditions. Cold, stable air masses, frequent temperature inversions, and increased wood burning combine to create persistent pollution episodes. Fog, common during winter mornings, further exacerbates the problem by trapping pollutants close to the ground. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should limit outdoor exertion during periods of stagnant air, especially in the mornings and evenings during autumn and winter. Increased ventilation in homes is advisable, and consideration should be given to air purifiers during periods of elevated pollution.