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Słupca, nestled within the Wielkopolskie Voivodeship of Poland, occupies a relatively flat, central position within the historical Greater Poland region. Its coordinates, 52.3000° N, 17.8667° E, place it within a landscape dominated by glacial landforms – a characteristic feature of northern Poland. The terrain is gently undulating, typical of a post-glacial plain, with an elevation averaging around 90-100 meters above sea level. The city is situated near the Warta River, a significant waterway that influences local humidity and can contribute to temperature inversions, trapping pollutants during calm weather. Surrounding Słupca is a predominantly agricultural zone, characterized by arable farmland, interspersed with smaller forests and meadows. This agricultural activity, while vital to the regional economy, introduces potential sources of particulate matter from field work and fertilizer use. The urban-rural gradient is fairly sharp; Słupca itself is a relatively compact town, but quickly transitions to open countryside. The lack of significant topographical barriers means that wind patterns play a crucial role in dispersing, or concentrating, pollutants. Proximity to larger industrial centres further east and west can also contribute to background pollution levels, transported by prevailing winds. The city’s location, while benefiting from agricultural productivity, presents challenges for maintaining optimal air quality due to these combined factors.

Air quality in Słupca follows a distinct seasonal pattern. Winter, from November to February, typically sees the poorest air quality. Low temperatures encourage the widespread use of coal and wood for heating in residential areas, releasing significant amounts of particulate matter (PM2.5 and PM10) and sulfur dioxide. Frequent temperature inversions, common during stable winter high-pressure systems, trap these pollutants near the ground, exacerbating the problem. Spring (March-May) brings gradual improvement as heating demand decreases, but agricultural activities – ploughing, fertilizing – can temporarily elevate particulate matter levels. Summer (June-August) generally offers the cleanest air, aided by higher temperatures, increased wind speeds, and rainfall which helps to wash pollutants from the atmosphere. However, prolonged heatwaves can lead to increased ground-level ozone formation. Autumn (September-October) sees a return to poorer conditions as heating use resumes, combined with stagnant air masses. Sensitive individuals – children, the elderly, and those with respiratory conditions – should limit strenuous outdoor activity during winter and autumn months. Monitoring wind direction is also advisable; winds from the east or west may carry pollutants from nearby industrial areas. Fog, common in autumn and winter, can further concentrate pollutants, reducing visibility and impacting respiratory health.