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Zaprešić, nestled in the Zagrebačka Županija of Croatia, occupies a strategic position within the Sava River basin, approximately 20 kilometers west of Zagreb. The city’s terrain is gently undulating, characteristic of the Pannonian Basin, with an elevation around 130 meters above sea level. This relatively low altitude, combined with its inland location, influences local weather patterns and air quality. Surrounding Zaprešić is a mix of agricultural land – primarily arable fields – and patches of deciduous forest, typical of the Croatian countryside. The urban-rural gradient is quite pronounced; moving away from the city centre quickly leads into open farmland. While Zaprešić itself isn’t heavily industrialized, its proximity to Zagreb, a significant industrial and transport hub, means it’s susceptible to pollutants carried by prevailing winds. The Sava River, while providing a natural boundary and potential for dilution, can also contribute to humidity and temperature inversions, trapping pollutants near the ground. The city’s growth, spurred by its commuter belt status to Zagreb, has increased traffic volume, a key source of localised air pollution. Understanding this interplay between geography, land use, and regional influences is crucial for assessing and mitigating air quality challenges in Zaprešić.

Zaprešić experiences a continental climate, with distinct seasons impacting air quality. Winter (December-February) often sees the poorest air quality due to increased wood and coal burning for heating, coupled with temperature inversions that trap pollutants. Calm, cold conditions exacerbate this, making January and February particularly challenging months for respiratory health. Spring (March-May) brings improvement as temperatures rise and heating demand decreases, though agricultural activities like field preparation can contribute to particulate matter. Summer (June-August) generally offers the cleanest air, aided by prevailing winds and higher temperatures promoting dispersion. However, heatwaves can sometimes lead to increased ozone formation. Autumn (September-November) is a transitional period. September often enjoys pleasant air, but as temperatures drop and heating systems are reactivated, pollution levels begin to climb again. October and November can be foggy, further trapping pollutants. Sensitive groups – children, the elderly, and those with respiratory conditions – should limit strenuous outdoor activity during winter and periods of stagnant air. Monitoring pollen counts is also important in spring and summer. Local meteorological conditions, particularly wind direction, heavily influence pollutant transport from Zagreb.