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Küsnacht, nestled on the picturesque Zürichsee (Lake Zurich) in the canton of Zurich, Switzerland, occupies a geographically advantageous yet subtly complex position. Located approximately 8 kilometers southeast of the city of Zurich, it forms part of the Zürich metropolitan area, experiencing a distinct urban–rural gradient. The municipality sits on a gently sloping terrain, rising from the lake's edge to elevations reaching around 480 meters above sea level. This topography influences local air circulation patterns; cooler air tends to settle in the lower-lying areas near the lake, potentially leading to localized inversions under certain meteorological conditions. The surrounding landscape is characterized by rolling hills, forested areas, and vineyards, contributing to a generally clean environment. However, Küsnacht's proximity to Zurich, a significant economic and industrial hub, means it is susceptible to transboundary pollution. While direct heavy industry within Küsnacht is limited, the broader Zürich region’s industrial belts and transportation corridors contribute to regional air pollution. Agricultural zones, primarily focused on viticulture and livestock farming, are present in the surrounding areas, introducing localized emissions from agricultural practices. The lake itself acts as a moderating influence, providing a degree of humidity and influencing wind patterns, but also potentially trapping pollutants under stagnant conditions. The urban fabric of Küsnacht is predominantly residential, with a mix of traditional Swiss architecture and modern developments, minimizing direct industrial contributions to air quality issues.

Küsnacht’s air quality exhibits a distinct seasonal pattern dictated by Switzerland’s temperate climate. Winter months (December-February) often present the greatest challenges. Temperature inversions, a common occurrence when cold, dense air settles in valleys and traps warmer air aloft, are more frequent during this period. This phenomenon can lead to a build-up of pollutants, particularly particulate matter and nitrogen oxides, originating from heating systems and traffic within Zurich. Fog, also prevalent in winter, further exacerbates the issue by reducing atmospheric mixing. Spring (March-May) brings a gradual improvement as temperatures rise and wind speeds increase, dispersing pollutants more effectively. However, pollen levels surge during this season, impacting individuals with respiratory sensitivities. Summer (June-August) generally offers the best air quality, with consistent sunshine, strong winds, and frequent convective mixing. The lake’s influence also helps to moderate temperatures and maintain relatively clean air. Autumn (September-November) sees a transitional period, with decreasing sunlight hours and increasing humidity. While not as problematic as winter, occasional temperature inversions can still occur, particularly in early autumn. Sensitive groups, such as children, the elderly, and individuals with pre-existing respiratory conditions, should be particularly mindful during winter months, limiting prolonged outdoor exposure on days with visibly reduced air quality. During pollen season, those with allergies should take appropriate precautions. Overall, the best time for outdoor activities in Küsnacht is during the summer months, when meteorological conditions favour air dispersion.