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Chojnice, nestled in the Pomeranian Voivodeship of Poland, occupies a unique geographic position within a gently undulating landscape. Situated at coordinates 53.7000, 17.5500, the city lies approximately 110km southwest of Gdańsk, acting as a regional hub for the surrounding Kashubian Lake District. The terrain is characterised by glacial formations, resulting in rolling hills and numerous small lakes and streams. This relatively flat topography, while aesthetically pleasing, can contribute to air stagnation, particularly during temperature inversions. Chojnice is not directly adjacent to a major industrial belt, but historically benefitted from forestry and wood processing, and is surrounded by a mix of agricultural land – primarily arable farming – and extensive forested areas. The urban-rural gradient is relatively sharp, with significant forested areas immediately bordering the city limits. This proximity to vegetation offers some natural air purification, but also means seasonal biomass burning for heating can impact local air quality. The lack of significant windbreaks, combined with the inland location, means Chojnice is less frequently flushed by strong winds compared to coastal cities. The Bylica River flows through the city, but its impact on dispersing pollutants is limited due to its size and flow rate. Understanding these geographical factors is crucial to interpreting Chojnice’s air quality patterns.

Chojnice experiences a temperate climate with distinct seasonal variations that significantly influence air quality. Winter (December-February) typically sees the poorest air quality, driven by increased residential heating using coal and wood, coupled with frequent temperature inversions trapping pollutants near the ground. Calm, cold conditions exacerbate this, creating stagnant air masses. Spring (March-May) brings gradual improvement as temperatures rise and heating demand decreases, though agricultural burning can briefly elevate particulate matter. Summer (June-August) generally offers the cleanest air, benefiting from prevailing winds and increased atmospheric mixing. However, heatwaves can sometimes lead to ozone formation, a secondary pollutant. Autumn (September-November) is a transitional period. Air quality initially remains good, but deteriorates as heating season begins and damp, foggy conditions become more frequent, trapping pollutants. October and November are often the worst months after the winter peak. Sensitive groups – children, the elderly, and those with respiratory conditions – should limit strenuous outdoor activity during winter and periods of stagnant air. Monitoring local forecasts and avoiding exercise near busy roads is advisable year-round. The wet season, generally autumn and winter, can temporarily wash pollutants from the air, but also increases humidity, potentially worsening respiratory symptoms.