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Szczecin, situated in Poland's Zachodniopomorskie voivodeship, occupies a strategic position at the confluence of the Oder River and its tributaries, approximately 65 kilometres south of the Baltic Sea coast. This port city lies within the West Pomeranian Lowlands, characterised by flat to gently undulating terrain with an average elevation of just 1-2 metres above sea level, making it particularly vulnerable to atmospheric stagnation. Szczecin's urban fabric blends historic architecture with industrial zones concentrated along the Oder River and its port facilities, creating distinct pollution gradients from the city centre outward to suburban and rural areas. The surrounding landscape comprises mixed agricultural lands, forests, and wetlands, with the Szczecin Lagoon to the north acting as a moderating influence on local climate. Proximity to Germany's industrial regions, particularly across the western border, means transboundary pollution occasionally affects air quality. The city's location in a river valley basin exacerbates pollutant trapping during calm weather conditions, while its coastal adjacency introduces sea breezes that can disperse contaminants when prevailing winds align from the north or northwest. Urban heat island effects in densely built areas further complicate atmospheric mixing, creating microclimates where pollutants accumulate.

Szczecin's air quality follows a distinct seasonal pattern influenced by its temperate maritime-continental climate. During winter, typically from December through February, cold temperatures increase residential heating demands, leading to elevated particulate matter from coal and wood combustion. Temperature inversions frequently occur in the Oder River valley, trapping pollutants near ground level and creating persistent haze, making these months particularly challenging for respiratory health. Spring brings gradual improvement as temperatures rise and atmospheric mixing increases, though March and April can experience dust resuspension from agricultural activities in surrounding rural areas. Summer offers the cleanest air, with June to August benefiting from stronger winds, frequent precipitation, and reduced heating emissions, ideal for outdoor activities despite occasional ozone formation on hot, sunny days. Autumn sees a deterioration from October onward as heating season resumes and stagnant conditions return, compounded by falling leaves contributing to biomass burning. Sensitive groups, including those with asthma or cardiovascular conditions, should limit prolonged outdoor exposure during winter inversion episodes and on summer days with high ozone potential, favouring midday hours when mixing is best. Monitoring local air quality forecasts is advisable year-round, especially during transitional seasons when rapid weather changes occur.