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Rheinfelden (Baden), nestled in the picturesque state of Baden-Württemberg, Germany, occupies a unique and strategically important location at the confluence of the Rhine and Erlenbach rivers. Its coordinates, 47.5611° N, 7.7917° E, place it directly on the border with Switzerland, creating a transboundary urban area. The town’s geography is characterized by a gently sloping terrain, rising gradually from the river valleys towards the surrounding hills of the Black Forest foothills. This topography influences local air circulation patterns; cooler air tends to settle in the valleys, potentially trapping pollutants under certain meteorological conditions. Rheinfelden sits within the Upper Rhine Valley, a historically significant industrial and agricultural region. To the west, the landscape transitions into rolling farmlands, while to the east, the Black Forest provides a backdrop of dense woodland. The Rhine River itself acts as a major transport corridor, with associated industrial activity along its banks, including logistics and chemical processing, which can contribute to localized air pollution. The urban–rural gradient is relatively smooth, with smaller villages and agricultural areas blending seamlessly into the town’s periphery. The elevation varies slightly, generally between 230 and 300 meters above sea level. This moderate elevation, combined with the valley setting, can exacerbate the effects of temperature inversions, particularly during the colder months, hindering the dispersion of pollutants. The proximity to Basel, Switzerland, a major economic hub, also means Rheinfelden experiences some spillover effects from that city’s industrial and transportation emissions.

Rheinfelden’s air quality experiences a distinct seasonal cycle heavily influenced by meteorological factors. Winter months (December-February) often present the greatest challenges. Temperature inversions, common in the Rhine Valley due to the surrounding topography, trap cold air and pollutants near the ground, leading to periods of stagnant air and increased particulate matter. Fog, frequently occurring during this period, further reduces visibility and can exacerbate respiratory issues. Spring (March-May) brings a gradual improvement as temperatures rise and wind speeds increase, aiding in pollutant dispersion. However, agricultural activities, such as fertilizer application, can contribute to ammonia emissions. Summer (June-August) generally offers the best air quality, with consistent sunshine, higher temperatures, and frequent breezes that effectively ventilate the area. However, occasional heatwaves can lead to ozone formation, a secondary pollutant. Autumn (September-November) sees a transition period, with decreasing temperatures and increasing humidity. Biomass burning, related to agricultural practices and heating preparations, can contribute to particulate matter. Sensitive groups, including children, the elderly, and individuals with pre-existing respiratory conditions, should be particularly cautious during winter months, limiting outdoor exertion on days with visibly poor air quality. Spring and autumn require awareness of agricultural emissions. While summer generally offers cleaner air, monitoring for ozone alerts is advisable during heatwaves. Maintaining indoor air quality through ventilation and air purification can be beneficial throughout the year, especially during periods of elevated pollution.