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Brzeg Dolny, nestled within the Dolnośląskie Voivodeship of Poland, occupies a strategic yet vulnerable position in the Silesian Lowland. The city’s geography is defined by its relatively flat terrain, a characteristic feature of this post-glacial landscape, with an elevation hovering around 160 meters above sea level. This low-lying nature, coupled with its location near the Oder River, significantly influences local air quality. The river itself, while providing a vital waterway, can contribute to humidity and temperature inversions, trapping pollutants. Historically, Brzeg Dolny developed as a river port and industrial centre, a legacy that continues to shape its economic profile and, consequently, its pollution sources. Surrounding the city are extensive agricultural lands, primarily arable fields, which, while contributing to the rural character, can also be sources of particulate matter from agricultural practices and seasonal burning. The urban-rural gradient is relatively sharp, transitioning quickly to open farmland. The proximity to larger industrial centres within the Silesian region, though not immediately adjacent, means Brzeg Dolny can experience transboundary pollution events, impacting baseline air quality. The prevailing westerly winds often carry pollutants from these sources, exacerbating local conditions. Understanding this interplay of geographical factors is crucial for effective air quality management in Brzeg Dolny.

Brzeg Dolny experiences a distinct seasonal air quality pattern. Winter, from November to February, typically sees the poorest air quality. Low temperatures encourage the widespread use of coal and wood for heating, a common practice in Polish households, releasing significant particulate matter (PM2.5 and PM10) and sulfur dioxide. Temperature inversions, frequent during these months due to the flat terrain and stable atmospheric conditions, trap pollutants near the ground. Spring (March-May) brings a gradual improvement as heating demand decreases, but agricultural burning of crop residue can temporarily worsen conditions. Summer (June-August) generally offers the cleanest air, aided by higher temperatures, increased wind speeds, and reduced heating needs. However, prolonged periods of sunshine and stagnant air can lead to ground-level ozone formation. Autumn (September-October) sees a return to poorer air quality as heating systems are reactivated. Fog, common during autumn mornings, can exacerbate particulate matter concentrations. 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, as westerly winds can bring pollutants from regional industrial areas. Avoiding peak heating hours can also reduce exposure.