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Sèvres, nestled within the Ile-de-France region of France, occupies a geographically significant position just west of Paris, a mere 10 kilometers from the capital's bustling center. Its coordinates (48.8239, 2.2117) place it on relatively flat terrain, part of the Seine Plain, characterized by alluvial soils deposited over millennia by the Seine River, which forms the city's northern boundary. This proximity to the Seine is crucial; while providing a scenic backdrop and recreational opportunities, it also influences local weather patterns and, consequently, air quality. The surrounding landscape transitions from urban fabric to a patchwork of residential areas, parks, and pockets of agricultural land, representing a gradual urban–rural gradient. To the west, the terrain gently rises, offering some relief from prevailing winds. Sèvres’ elevation is low, averaging around 30 meters above sea level, minimizing any natural elevation-driven dispersion of pollutants. Historically, the area was known for its porcelain factories, though industrial activity has significantly decreased, replaced by a more service-oriented economy. However, the legacy of past industrial processes, combined with its close proximity to the Paris metropolitan area's extensive industrial belts and transportation corridors, means Sèvres is susceptible to transboundary pollution. The city’s location within the densely populated Ile-de-France region inherently links its air quality to the broader regional pollution dynamics, making it a microcosm of the challenges faced by many European urban centers.

Sèvres’ air quality exhibits a distinct seasonal pattern dictated by meteorological conditions and regional pollution sources. Winter months (December-February) often see the poorest air quality, primarily due to temperature inversions. Cold, stable air becomes trapped near the ground, preventing the vertical dispersion of pollutants emitted from vehicles, heating systems, and industrial sources across the Paris region. Fog, common during these months, further exacerbates the problem by trapping particulate matter. Spring (March-May) brings a gradual improvement as temperatures rise, and wind speeds increase, facilitating pollutant dispersal. However, pollen levels also surge, impacting individuals with respiratory sensitivities. Summer (June-August) generally offers the best air quality, with consistent winds and higher temperatures promoting efficient ventilation. Occasional heatwaves can, however, lead to stagnant air and elevated ozone levels, a secondary pollutant formed by sunlight reacting with vehicle emissions. Autumn (September-November) presents a transitional period. Initially, air quality remains relatively good, but as temperatures drop and wind speeds decrease, conditions become more conducive to pollutant accumulation, mirroring the winter pattern. Sensitive groups, including children, the elderly, and individuals with pre-existing respiratory conditions, should exercise caution during winter and early spring, limiting outdoor activity during periods of stagnant air or high pollen counts. During summer heatwaves, avoiding strenuous outdoor activity during peak sunlight hours is advisable.