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Koło, nestled within the Wielkopolskie Voivodeship of Poland, occupies a geographically significant position in the central-western portion of the country. Its coordinates (52.2000, 18.6333) place it within a gently undulating landscape, characterized by fertile plains and low hills, typical of the Greater Poland region. The city sits approximately 130 meters above sea level, contributing to localized temperature variations and influencing atmospheric stability. Koło is situated near the Warta River, though the river's direct influence on the city's immediate microclimate is moderate; it primarily affects the broader regional hydrology. The surrounding landscape is predominantly agricultural, with extensive fields of grain and rapeseed dominating the view, a pattern reflecting the region's historical importance as a breadbasket. This agricultural activity, while vital to the local economy, can contribute to seasonal particulate matter emissions, particularly during harvest periods. To the east, the terrain gradually rises, hinting at the beginnings of the Malopolska Upland. The urban–rural gradient around Koło is relatively smooth, with smaller villages and agricultural holdings blending seamlessly into the city's periphery. Historically, Koło served as a crucial trade hub, and while industrial activity is not as pronounced as in larger Polish cities, there are local businesses and processing facilities that contribute to the overall air quality profile. The prevailing westerly winds, common to this part of Poland, play a crucial role in dispersing pollutants, though inversions can occasionally trap them, especially during colder months.

Koło’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 early field work, can introduce ammonia and particulate matter. Summer (June-August) generally sees the best air quality, with consistent winds and higher temperatures promoting good ventilation. Occasional heatwaves can, however, exacerbate ozone formation, though this is less of a concern than in more southerly European cities. Autumn (September-November) marks a shift, with decreasing temperatures and calmer winds. This period frequently witnesses a rise in particulate matter, stemming from agricultural residue burning (though increasingly regulated) and increased residential heating as temperatures drop. The most challenging period is winter (December-February). Cold, stable air masses frequently lead to temperature inversions, trapping pollutants close to the ground. Fog, common during these months, further reduces dispersion. Residential heating, primarily reliant on coal and wood in some households, significantly contributes to particulate pollution. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should limit prolonged outdoor exposure during these periods, particularly on days with low visibility or stagnant air. Maintaining indoor air quality through ventilation and air purification can also be beneficial. While summer offers the most favourable conditions, even then, brief periods of elevated ozone should be monitored, and outdoor activities planned accordingly.