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Tešanj, nestled in the central Bosnian basin, is a municipality defined by its undulating terrain and strategic position within the Federation of Bosnia and Herzegovina. Situated approximately 100km north of Sarajevo, the city occupies a valley carved by the Osrak and Spreča rivers, which contribute to a localized microclimate. The surrounding landscape is predominantly hilly, transitioning into more substantial mountains further afield, creating a natural bowl effect that can trap air masses. Historically, Tešanj developed as a trading post along important routes, and this legacy is reflected in its relatively compact urban form. While agriculture remains significant in the surrounding areas – primarily arable land and orchards – the presence of some light industrial activity, particularly related to wood processing and metalworking, contributes to localized emissions. The urban-rural gradient is fairly sharp, with agricultural lands immediately bordering the city limits. This proximity means that seasonal agricultural practices, such as burning of crop residue, can impact local air quality. The valley location, combined with limited atmospheric circulation during stable weather patterns, makes Tešanj susceptible to pollutant accumulation, particularly during colder months. The elevation, around 215 meters, isn’t high enough to benefit from significant atmospheric dispersion.

Air quality in Tešanj follows a distinct seasonal pattern. Winter, from November to February, typically sees the poorest air quality. Low temperatures create temperature inversions, trapping pollutants emitted from residential heating (wood and coal are common fuels) and industrial sources near the ground. Calm wind conditions exacerbate this, preventing dispersion. January and February are often the most challenging months. Spring, from March to May, brings gradual improvement as temperatures rise and rainfall increases, washing pollutants from the atmosphere. However, agricultural burning following the winter harvest can cause temporary spikes in particulate matter. Summer, June to August, generally offers the cleanest air, with higher temperatures promoting atmospheric mixing and frequent, albeit localized, convective showers. Autumn, September to November, sees a deterioration as heating demand increases and atmospheric stability returns. October is often a transition month with fluctuating conditions. Sensitive groups – children, the elderly, and those with respiratory conditions – should limit strenuous outdoor activity during winter and autumn months. Monitoring local conditions and avoiding peak pollution times is crucial. Fog, common in the valley during autumn and winter, can further concentrate pollutants.