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Lębork, nestled within the Pomorskie region of Poland, occupies a geographically significant position at the edge of the Kashubian Lake District, approximately 25 kilometers inland from the Baltic Sea. Its coordinates (54.55°N, 17.75°E) place it on a gently undulating terrain, characterized by morainic hills and valleys sculpted by glacial activity during the Pleistocene epoch. The city itself sits at an elevation of roughly 40 meters above sea level, gradually rising towards the northwest. This proximity to the Baltic influences local weather patterns and, crucially, air quality. Lębork is surrounded by a mosaic of agricultural land – predominantly arable fields used for grain and rapeseed cultivation – interspersed with pockets of forest, primarily coniferous and mixed deciduous woodlands. To the east, the landscape transitions into a more expansive agricultural belt, while to the west, the lake district offers a degree of natural air purification. The urban–rural gradient is relatively sharp, with the city’s built environment quickly giving way to agricultural and forested areas. Historically, Lębork’s location has made it a trade hub, and while industrial activity is present, it’s less intensive than in larger Polish cities. The prevailing winds, generally from the west and southwest, carry maritime air masses, which can both dilute and, under certain conditions, transport pollutants from coastal industrial zones. The surrounding topography can also contribute to localized air stagnation, particularly during periods of calm weather, trapping pollutants within the valley systems.

Lębork’s air quality experiences a distinct seasonal cycle heavily influenced by meteorological conditions. Spring (March-May) often brings a gradual improvement as temperatures rise and winds increase, dispersing accumulated winter pollutants. However, agricultural activities, including fertilizer application and field burning (though increasingly regulated), can contribute to localized spikes in ammonia and particulate matter. Summer (June-August) typically sees the best air quality, with consistent winds and relatively high temperatures promoting good ventilation. However, heatwaves can lead to stagnant air and ozone formation, particularly during sunny, calm days. Autumn (September-November) marks a transition period, with decreasing temperatures and increasing humidity. The burning of agricultural residues, though restricted, can still occur, releasing smoke and particulate matter. Fog, common during autumn mornings, traps pollutants near the ground, exacerbating local air quality issues. Winter (December-February) presents the most challenging period. Cold temperatures and frequent temperature inversions – where a layer of warm air sits above cooler air – trap pollutants close to the surface, leading to increased concentrations of particulate matter and nitrogen oxides. These inversions are often accompanied by periods of calm winds, further hindering dispersion. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should limit outdoor activity during prolonged periods of fog or temperature inversions, particularly in the early morning hours. Maintaining indoor air quality through ventilation and air purification can also be beneficial during these times. The proximity to agricultural lands means pollen counts are also a factor during spring and early summer, impacting those with allergies.