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Žepče, nestled in the heart of Bosnia and Herzegovina’s Federation, occupies a strategically important, yet geographically complex, position. Located at coordinates 44.4333, 18.0333, the town straddles the Lašva River, a tributary of the Bosna River, and is situated within a valley carved by the Dinaric Alps. This valley location, while providing some protection, also creates a natural funnel for air masses, potentially trapping pollutants. The terrain is predominantly hilly and mountainous, rising sharply away from the riverbanks, influencing local wind patterns and contributing to temperature inversions, particularly during colder months. Žepče’s urban character is defined by its industrial heritage, historically centered around metal processing and wood industries, though these have undergone restructuring. Surrounding the town are agricultural lands, primarily used for livestock farming and crop cultivation, contributing to potential ammonia emissions. The urban-rural gradient is relatively sharp, transitioning quickly to forested slopes and rural settlements. The proximity to larger industrial centers further upstream along the Bosna River, and the prevailing wind directions, mean Žepče can experience transboundary pollution. This combination of factors makes understanding and mitigating air quality challenges crucial for the town’s 31,582 residents.

Žepče’s air quality follows a distinct seasonal pattern. Winter, from November to February, typically sees the poorest air quality. Low temperatures create stable atmospheric conditions, fostering temperature inversions that trap pollutants emitted from residential heating – primarily wood and coal – and remaining industrial activity. Calm winds exacerbate this, preventing dispersion. Fog, common during these months, further reduces visibility and concentrates particulate matter. Spring (March-May) brings gradual improvement as temperatures rise and precipitation increases, washing pollutants from the atmosphere. However, agricultural activities, like fertilizer application, can contribute to ammonia levels. Summer (June-August) generally offers the cleanest air, with higher temperatures promoting better dispersion and less reliance on solid fuel heating. However, periods of prolonged heat and drought can lead to increased dust and wildfire risk, impacting air quality. Autumn (September-October) sees a return to deteriorating conditions as heating demand increases and atmospheric stability returns. Sensitive groups – children, the elderly, and those with respiratory conditions – should limit strenuous outdoor activity during winter and autumn months. Monitoring wind direction is key; winds from the north and east often carry pollutants from regional sources.