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Cieszyn, nestled in the historical Śląskie Voivodeship of southern Poland, occupies a geographically significant position at the confluence of the Olza and Cieszynka rivers, forming the border with the Czech Republic. Its coordinates (49.7484, 18.6332) place it within the Carpathian foothills, resulting in a gently undulating terrain with an average elevation of approximately 240 meters above sea level. The surrounding landscape is a mosaic of rolling hills, dense forests – primarily beech and oak – and fertile agricultural land, characteristic of the Silesian Lowlands. This proximity to agricultural zones, while contributing to the region’s rural charm, can occasionally introduce biogenic volatile organic compounds (BVOCs) into the atmosphere, particularly during warmer months. The city’s urban character is distinctly Central European, with a well-preserved historic core showcasing Baroque and Renaissance architecture. Cieszyn’s location on the Olza River has historically been crucial for trade and transportation, and the river itself influences local microclimates, sometimes trapping pollutants under stable atmospheric conditions. The urban–rural gradient is relatively sharp; the city transitions quickly into agricultural fields and forested areas, impacting air quality by filtering some pollutants but also potentially introducing others. The city’s position near the Czech border means that transboundary pollution events are a possibility, with air masses readily crossing the frontier, influenced by weather patterns in both countries. The broader Silesian region, historically an industrial heartland, has seen a shift away from heavy industry, but legacy pollution and occasional industrial emissions still contribute to regional air quality challenges.

Cieszyn’s air quality experiences a distinct seasonal cycle heavily influenced by meteorological conditions. Winter months (December-February) often see the most challenging air quality, primarily due to temperature inversions. Cold, stable air becomes trapped near the ground, preventing the vertical dispersion of pollutants from residential heating (often coal-based) and remaining industrial activity. Fog, common during this period, further exacerbates the problem by trapping particulate matter. Spring (March-May) brings a gradual improvement as temperatures rise and wind speeds increase, dispersing pollutants more effectively. However, agricultural activities, including the spreading of fertilizers, can introduce ammonia and other agricultural pollutants. Summer (June-August) generally offers the best air quality, with frequent convective mixing and higher wind speeds. However, hot, still days can occasionally lead to ozone formation, a secondary pollutant. Autumn (September-November) presents a transitional period. As temperatures cool, the risk of temperature inversions returns, and agricultural burning, though regulated, can contribute to localized pollution episodes. The prevalence of residential heating using solid fuels significantly impacts air quality throughout the colder months, making vulnerable populations – children, the elderly, and those with respiratory conditions – particularly susceptible. During periods of stagnant air, limiting outdoor exertion and ensuring adequate ventilation are advisable. The city’s location within a valley can also contribute to localized pollution accumulation, especially during periods of low wind. Public health advisories are often issued during winter months, urging residents to reduce wood-burning and take precautions to minimize exposure to pollutants.