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Wieluń, nestled within the Łódzkie Voivodeship of central Poland, occupies a geographically significant position within the historical and economic landscape of the region. Located at approximately 51.22°N, 18.57°E, the city sits on the edge of the Wieluński Upland, a gently undulating terrain characterized by loess soils and rolling hills. Its elevation averages around 180 meters above sea level, contributing to localized microclimates and influencing air circulation patterns. The surrounding landscape is predominantly agricultural, with extensive fields of grain and rapeseed stretching outwards, interspersed with pockets of deciduous forest. This proximity to agricultural zones introduces potential sources of particulate matter, particularly during planting and harvesting seasons. Wieluń is not directly adjacent to any major rivers, though smaller streams and drainage channels crisscross the area, impacting local humidity and potentially affecting pollutant dispersion. Historically, the city served as a regional trade hub, and while industrial activity has diminished compared to its peak, remnants of past manufacturing, including some smaller-scale processing facilities, remain within and around the urban area. The urban–rural gradient is relatively sharp, with the city transitioning quickly into agricultural land, which can limit the dilution of pollutants released within Wieluń. The upland setting, combined with the surrounding flat plains, can sometimes lead to stagnant air conditions, particularly during periods of stable weather, exacerbating local air quality challenges. The city’s compact urban form, with older residential areas close to the historic market square, also influences pollutant concentrations.

Wieluń’s air quality experiences a distinct seasonal cycle heavily influenced by meteorological conditions. Winter months (December-February) often present the most challenging period. Cold temperatures frequently lead to temperature inversions, where a layer of warm air traps cooler air near the ground, preventing pollutants from dispersing effectively. This, coupled with reduced sunlight hours and increased domestic heating reliant on solid fuels like coal and wood, results in elevated particulate matter concentrations. Fog, a common occurrence during these months, further restricts visibility and traps pollutants close to the ground. Spring (March-May) brings a gradual improvement as temperatures rise and wind speeds increase, aiding in pollutant dilution. Agricultural activities, however, introduce new sources of particulate matter from soil disturbance and fertilizer application. Summer (June-August) generally offers the best air quality, with frequent rainfall and strong winds effectively clearing the atmosphere. However, occasional heatwaves can lead to stagnant air and ozone formation. Autumn (September-November) sees a return to more challenging conditions as temperatures cool and agricultural burning practices resume, contributing to increased particulate pollution. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should exercise caution during winter and early spring, limiting prolonged outdoor exposure on days with poor visibility or noticeable odors. During the agricultural seasons, minimizing exposure near fields during peak activity is advisable. Maintaining indoor air quality through proper ventilation and air filtration can also provide significant protection.