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Posušje sits nestled within the rugged, karst landscapes of western Herzegovina, positioned on a high plateau that defines the transition between the Mediterranean coast and the more continental interior of Bosnia and Herzegovina. The geography is characterized by dramatic limestone formations, sinkholes, and undulating hills that create a complex topographical mosaic. At an elevation that commands a cool, breezy atmosphere, the city serves as a vital regional hub, though its physical setting significantly dictates its atmospheric dynamics. The surrounding terrain, marked by the presence of the Dinaric Alps' foothills, creates a natural basin-like effect in certain pockets of the municipality. This structural arrangement is crucial for understanding local air quality; while the open plateaus allow for significant wind dispersion during many months, the depressions and valleys are prone to stagnation. Unlike larger industrial centers in the northern Bosnian basins, Posušje lacks massive heavy-industry belts, meaning its air quality profile is more closely tied to local anthropogenic activities and the specific meteorological interactions of the karst landscape. The urban-rural gradient is relatively tight, with residential developments interspersed among agricultural patches and rocky outcrops. This proximity means that local domestic emissions can quickly influence the ambient air, as the terrain does not always provide the vast buffers found in flatter, more expansive plains. Consequently, the interaction between the high-altitude winds and the local valley microclimates remains the primary driver of the city's air, making seasonal shifts in wind patterns and temperature highly significant for local respiratory health and environmental management within Posušje.

The atmospheric cycle in Posušje follows a distinct seasonal rhythm driven by its Mediterranean-continental hybrid climate. During the winter months, from late November through February, the city often experiences its most challenging air quality periods. Cold air settles into the local depressions, creating temperature inversions that trap residential heating emissions primarily from wood and coal near the ground. These stagnant periods can lead to increased particulate matter, making winter months a time for sensitive individuals to monitor local conditions closely. As spring arrives in March and April, increasing wind speeds and more frequent rainfall help to cleanse the atmosphere, washing away accumulated pollutants and providing a refreshing period for outdoor activities. Summer brings a different dynamic; while the air is generally clearer due to vigorous thermal winds and high solar radiation, the dry karst terrain can contribute to higher levels of airborne dust. The warm, dry Mediterranean influence during July and August generally facilitates good dispersion, though intense heat can occasionally exacerbate ozone formation. Autumn, particularly October and November, marks a transitional phase where increasing humidity and the onset of morning fog can temporarily reduce visibility and trap localized emissions. For optimal outdoor recreation, the spring and summer months are typically most favorable. Conversely, during heavy winter inversion events, vulnerable groups, including children and the elderly, should consider reducing prolonged strenuous outdoor exertion to minimize exposure to concentrated seasonal pollutants throughout Posušje. This proactive approach is essential when atmospheric stability limits the natural dispersal of smoke and dust across terrain.