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Bochnia, nestled within the Małopolskie Voivodeship of southern Poland, occupies a geographically significant position within the historical region of Lesser Poland. Located at approximately 49.98°N, 20.43°E, the city’s terrain is characterized by gently rolling hills, a typical feature of the Carpathian foothills that influence the broader regional landscape. The elevation averages around 210 meters above sea level, contributing to localized microclimates and influencing air circulation patterns. Bochnia sits within a predominantly agricultural zone, surrounded by fertile fields and orchards, a legacy of centuries of farming practices. To the south, the landscape gradually ascends towards the more rugged terrain of the Carpathian Mountains, while to the north, it transitions into a more undulating plain. The Wisła River, though not directly adjacent, flows within a reasonable distance, impacting regional humidity and weather systems. Historically, Bochnia’s location facilitated trade routes, and while industrial activity is present, it’s less intensive than in larger Polish cities like Kraków. The urban–rural gradient is relatively smooth, with smaller villages and agricultural land seamlessly blending into the city’s periphery. This proximity to agricultural areas means that seasonal burning practices and fertilizer use can contribute to localized air quality fluctuations. The city’s compact urban form, with a historic market square at its heart, contrasts with the surrounding rural expanse, creating a unique interplay between urban development and the natural environment, which collectively shapes its air quality profile.

Bochnia’s air quality experiences a distinct seasonal cycle heavily influenced by meteorological conditions. Winter, spanning December to February, often presents the most challenging period. Cold temperatures frequently lead to temperature inversions, trapping pollutants close to the ground and exacerbating air stagnation. Reduced sunlight hours and increased heating demand from residential sources further contribute to elevated particulate matter concentrations. Fog, a common occurrence during these months, further impedes pollutant dispersion. Spring (March-May) brings a gradual improvement as temperatures rise, and wind speeds increase, aiding in the dispersal of pollutants. Agricultural activities, including fertilizer application, can introduce ammonia into the air. Summer (June-August) generally offers the best air quality, with consistent winds and higher temperatures promoting efficient pollutant dispersion. However, occasional heatwaves can lead to ozone formation. Autumn (September-November) sees a return to more variable conditions. Cooler temperatures and decreasing sunlight hours, coupled with agricultural burning practices as farmers prepare fields for winter, can lead to periods of poorer air quality. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should exercise caution during winter months, limiting outdoor exposure on days with stagnant air. During the agricultural season, particularly in autumn, minimizing strenuous outdoor activity near fields is advisable. Maintaining indoor air quality through proper ventilation and air purification can also be beneficial throughout the year, especially during periods of elevated pollution.