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Worb, nestled in the canton of Bern, Switzerland, occupies a geographically significant position within the Bernese Plateau. Located at coordinates 46.9306° N, 7.5644° E, the town sits at an elevation of approximately 545 meters (1788 feet) above sea level, contributing to its generally cool climate. The surrounding landscape is characterized by rolling hills and agricultural fields, a typical feature of the Swiss Plateau. Worb’s terrain is gently sloping, facilitating urban development while retaining a connection to the rural environment. The town is situated on the western edge of the plateau, overlooking the picturesque valley of the Schwarzwasser river, which flows towards the Aare. This proximity to water, though not a major river, influences local humidity and microclimates. While not directly adjacent to major industrial zones, Worb’s regional position places it within reach of industrial activity concentrated in larger cities like Bern and Thun, impacting potential long-range pollutant transport. The urban–rural gradient is relatively smooth; Worb blends seamlessly with the surrounding agricultural land, minimizing sharp boundaries. The town’s location within a relatively sheltered valley can, however, exacerbate the effects of temperature inversions, trapping pollutants under stable atmospheric conditions. The prevailing winds generally flow from west to east across the plateau, influencing the dispersal of any locally generated emissions. The surrounding forests, primarily composed of deciduous trees, play a role in absorbing some pollutants and moderating air quality, though their impact is seasonal.

Worb’s air quality experiences a distinct seasonal cycle driven by meteorological factors. During the spring (March-May), increased agricultural activity, including fertilizer application and tilling, can contribute to localized ammonia emissions, impacting air quality, particularly in the mornings. The warming temperatures and increasing sunlight also stimulate biogenic emissions from vegetation. Summer (June-August) generally sees improved air quality due to stronger daytime convective mixing, which disperses pollutants. However, periods of prolonged heat can lead to stagnant air and ozone formation, especially during sunny, calm days. Autumn (September-November) often presents a mixed picture. While wind patterns tend to be more variable, temperature inversions are more frequent as the nights become cooler, trapping pollutants near the ground, particularly in the mornings. This is a period when air quality can fluctuate significantly. Winter (December-February) typically witnesses the lowest air quality due to persistent temperature inversions, reduced sunlight, and increased heating demand. Cold, stable air masses often settle over the Bernese Plateau, preventing the vertical mixing of pollutants. Fog, common during winter mornings, further exacerbates the problem by trapping particulate matter. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should limit prolonged outdoor activity during winter mornings and periods of stagnant air. Increased ventilation in homes during colder months can also elevate indoor pollutant levels, necessitating careful management of heating systems and indoor air quality.