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Nedelišće, nestled within the Međimurje region of northern Croatia, occupies a geographically significant position at 46.38° N, 16.39° E. The town’s setting is characterized by a gently undulating terrain, part of the Pannonian Basin, a vast lowland area known for its fertile soils and agricultural productivity. Situated near the Mura River, which forms a portion of the Croatian-Slovenian border, Nedelišće benefits from proximity to a vital waterway, though its direct impact on air quality is more indirect, influencing local humidity and microclimates. The surrounding landscape is predominantly agricultural, with extensive fields of corn, wheat, and other crops dominating the view. To the east, the landscape gradually rises towards the foothills of the Alps, creating a subtle elevation gradient. This proximity to agricultural zones means that seasonal agricultural practices, such as fertilizer application and harvesting, can contribute to localized air pollution episodes. The urban–rural gradient around Nedelišće is relatively smooth; the town itself is a compact settlement, blending seamlessly into the surrounding farmland. While not directly adjacent to major industrial belts, Nedelišće’s location within Međimurje places it within a region experiencing moderate industrial activity, primarily related to food processing and light manufacturing, which can contribute to regional air quality challenges. The basin’s topography, while generally flat, can occasionally trap pollutants, particularly during periods of stable atmospheric conditions. The prevailing winds, typically from the northwest, play a crucial role in dispersing or concentrating pollutants within the region.

Nedelišće’s air quality experiences a distinct seasonal cycle dictated by the region’s continental climate. Spring (March-May) often brings a noticeable increase in pollen levels, impacting those with allergies and potentially exacerbating respiratory conditions. Agricultural activities ramp up during this period, with fertilizer application contributing to ammonia emissions and localized odor issues. Summer (June-August) generally sees improved air quality due to increased convective mixing – warmer temperatures and stronger winds help disperse pollutants. However, prolonged periods of hot, still weather can lead to temperature inversions, trapping pollutants near the ground, particularly in the evenings. Autumn (September-November) presents a mixed picture. Harvesting activities release dust and particulate matter, while cooler temperatures can lead to increased fog formation, which can trap pollutants. The most concerning period is often late autumn, when stable atmospheric conditions and cooler temperatures combine to create stagnant air. Winter (December-February) typically brings the poorest air quality, characterized by frequent temperature inversions and reduced wind speeds. These inversions trap pollutants, leading to elevated concentrations of particulate matter and other pollutants. Fog, common during winter months, further exacerbates this issue. Sensitive groups, including children, the elderly, and individuals with pre-existing respiratory or cardiovascular conditions, should limit outdoor exertion during periods of stagnant air and fog, particularly in the mornings. Monitoring local weather forecasts and air quality reports is advisable for informed decision-making regarding outdoor activities.