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Stolac, nestled in the Herzegovina-Neretva Canton of Bosnia and Herzegovina, occupies a geographically significant position within a karst landscape. The city is situated along the Neretva River, a crucial waterway carving through the rugged terrain. Its coordinates (43.0839, 17.9592) place it within a valley, surrounded by the Dinaric Alps, creating a basin-like effect. The elevation is approximately 228 meters above sea level, influencing local weather patterns and air circulation. Stolac’s urban character is defined by its historical Ottoman architecture and relatively compact size, with a population of around 14,889. The surrounding area is predominantly rural, characterized by agricultural lands – vineyards and orchards are common – and forested hillsides. While Stolac itself lacks heavy industry, its regional position means it can be affected by pollutants transported from more industrialized areas further north and west. The Neretva River, while a vital resource, can also contribute to localized humidity and potential temperature inversions, trapping pollutants. The urban-rural gradient is relatively sharp, with agricultural practices potentially contributing to particulate matter during harvest seasons. The valley location, while scenic, limits air dispersion, making Stolac susceptible to pollution build-up.

Stolac’s air quality follows a distinct seasonal pattern. Spring (March-May) sees a gradual improvement after the winter months, though agricultural burning for land preparation can temporarily elevate particulate matter. Summer (June-August) typically offers the cleanest air, benefiting from prevailing winds that help disperse pollutants and higher temperatures promoting atmospheric mixing. However, prolonged heatwaves can exacerbate ozone formation. Autumn (September-November) marks a deterioration in air quality. Cooler temperatures lead to increased wood and coal burning for heating, particularly in residential areas, contributing to higher levels of PM2.5 and PM10. Temperature inversions, common in the valley during this period, trap pollutants near the ground. Winter (December-February) represents the most challenging period for air quality. Reduced sunlight, stable atmospheric conditions, and increased reliance on solid fuel heating result in consistently higher pollution levels. Fog, frequent in the Neretva valley during winter, further exacerbates the problem by trapping pollutants. Sensitive groups – children, the elderly, and those with respiratory conditions – should limit outdoor activity during autumn and winter. Spring and summer offer the most favourable conditions for outdoor pursuits, but even then, monitoring local conditions is advisable.