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Arbon, nestled in the canton of Thurgau, Switzerland, occupies a strategically significant location on the western shore of Lake Constance (Bodensee), bordering Germany. Its coordinates (47.5167, 9.4333) place it within a gently sloping terrain, rising gradually from the lake’s edge towards the surrounding hills. The city’s urban character is distinctly Swiss – a blend of historic charm and modern functionality, with well-maintained residential areas interspersed with commercial spaces. The landscape surrounding Arbon is predominantly agricultural, characterized by fertile fields and orchards, typical of the Thurgau region, known for its fruit production. To the east, the landscape rises into the foothills of the Alps, influencing regional weather patterns. The proximity to Lake Constance plays a crucial role in Arbon’s microclimate and air quality. The lake acts as a thermal regulator, moderating temperatures and influencing wind patterns. While the region isn't dominated by heavy industry, agricultural practices, particularly the use of machinery and fertilizers, contribute to localized emissions. The urban–rural gradient is relatively smooth; Arbon seamlessly integrates with the surrounding agricultural land, minimizing sharp contrasts. The Rhine-Alpine corridor, a major transport route, passes nearby, potentially introducing transboundary pollutants, though Arbon itself is not a major industrial hub. The elevation, averaging around 405 meters above sea level, contributes to potential temperature inversions during colder months, which can trap pollutants near the ground. The lake's influence, combined with the surrounding agricultural land, creates a unique environmental context for air quality management.

Arbon’s air quality experiences a distinct seasonal cycle driven by meteorological factors. Spring (March-May) sees a gradual improvement as temperatures rise and wind speeds increase, dispersing any lingering winter pollutants. However, agricultural activities intensify during this period, leading to increased emissions from machinery and fertilizer application, potentially causing localized spikes in particulate matter. Summer (June-August) generally offers the best air quality, with consistent sunshine, strong winds, and frequent convective mixing that effectively ventilates the area. The lake breeze further contributes to pollutant dispersal. Autumn (September-November) marks a transition period. As temperatures cool and wind speeds decrease, the risk of temperature inversions increases, particularly during still nights. This can trap pollutants, leading to periods of reduced visibility and potentially impacting air quality. Agricultural burning, a traditional practice in some areas, can also contribute to particulate matter during this season. Winter (December-February) typically presents the most challenging conditions. Cold, stable air masses, coupled with frequent fog and temperature inversions, can lead to stagnant air and the accumulation of pollutants. Residential heating, primarily using wood or oil, contributes to particulate matter and carbon monoxide levels. Sensitive groups, such as children, the elderly, and individuals with respiratory conditions, should limit prolonged outdoor activity during periods of fog or temperature inversions, particularly in the mornings. During the warmer months, outdoor activities are generally safe, but awareness of agricultural practices is advised. Spring and autumn require careful monitoring of local conditions and adherence to public health advisories.