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Bolesławiec, nestled within the Dolnośląskie Voivodeship of southwestern Poland, occupies a unique geographic position. The city sits on the Bóbr River, a tributary of the Oder, at an elevation of approximately 230-300 meters above sea level. This location within the Sudetes foothills contributes to a bowl-shaped topography, a common feature in this region that can exacerbate air pollution. Historically, Bolesławiec has been a centre for ceramics production, a legacy that continues today, with numerous factories contributing to localised industrial emissions. The surrounding landscape is a mix of rolling hills, forests, and agricultural land, transitioning to more rugged terrain as one moves closer to the Sudetes mountains. The urban-rural gradient is relatively sharp, with agricultural fields and forested areas immediately bordering the city limits. This proximity to agricultural zones introduces potential for ammonia emissions from fertilizer use, impacting secondary particulate matter formation. The Bóbr River, while providing a water resource, also limits atmospheric dispersion during calm weather conditions. The prevailing winds, often from the west or southwest, can carry pollutants from larger industrial centres further west into the Bolesławiec area, while local emissions can become trapped by the topography, particularly during temperature inversions. This combination of factors makes Bolesławiec particularly sensitive to air quality issues.

Air quality in Bolesławiec follows a distinct seasonal pattern. Winter, from November to February, typically sees the poorest air quality. Low temperatures encourage the widespread burning of coal and wood for heating, a significant source of particulate matter (PM2.5 and PM10) and sulphur dioxide. Frequent temperature inversions, common in the bowl-shaped valley, trap pollutants near the ground, worsening conditions. Spring (March-May) brings gradual improvement as heating demand decreases, but agricultural activities begin, potentially increasing ammonia levels. Summer (June-August) generally offers the best air quality, with warmer temperatures promoting dispersion and reduced heating. However, prolonged periods of high pressure and sunshine can lead to photochemical smog formation, increasing ozone levels. Autumn (September-October) sees a return to poorer conditions as heating resumes, often coupled with stagnant air masses. October is often a particularly challenging month. Sensitive individuals – children, the elderly, and those with respiratory conditions – should limit strenuous outdoor activity during winter and autumn months. Monitoring wind direction is crucial; westerly winds may bring pollutants from regional sources. Fog, common in autumn and winter, further concentrates pollutants, necessitating increased caution.