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Xuanzhou, located in southeastern Anhui Province, China, occupies a strategic position at the confluence of the Yangtze River Delta and the mountainous regions of southern Anhui. Situated at coordinates 30.9390°N, 118.7590°E, this urban district of Xuancheng City lies within the transitional zone between the Yangtze Plain to the north and the Huangshan Mountains to the south, creating a distinctive geographic context that profoundly influences its air quality patterns. The terrain slopes gently from southern foothills toward the Yangtze River basin, with elevations ranging from approximately 50 to 200 meters above sea level, creating a natural amphitheater effect that can trap pollutants under certain meteorological conditions. Xuanzhou's position along the Qingyi River, a tributary of the Yangtze, provides some natural ventilation but also places it within the broader industrial corridor of eastern China. The city serves as a regional transportation hub connecting the industrial centers of the Yangtze River Economic Belt with the agricultural and tourism regions of southern Anhui. This urban-rural gradient creates complex pollution dynamics, with local emissions from urban development, transportation networks, and small-scale manufacturing blending with regional transport from the heavily industrialized Yangtze Delta. The surrounding landscape features a mix of agricultural valleys, forested hills, and expanding urban infrastructure, creating microclimates that affect pollutant dispersion. Xuanzhou's geographic position makes it susceptible to both local pollution accumulation and regional haze transport, particularly during periods of stagnant atmospheric conditions when the surrounding topography inhibits ventilation.

Xuanzhou experiences distinct seasonal variations in air quality driven by the East Asian monsoon system and local meteorological patterns. During winter (December-February), cold, stable atmospheric conditions frequently create temperature inversions that trap pollutants near the surface, particularly during calm mornings when heating emissions peak. This season typically sees the highest pollution concentrations, with January often presenting the most challenging conditions for outdoor activities. Sensitive groups should limit prolonged exposure during winter mornings and consider indoor air purification. Spring (March-May) brings transitional weather with increasing precipitation that helps cleanse the atmosphere, though occasional dust transport from northern regions can temporarily degrade air quality. The increasing solar radiation and thermal convection improve vertical mixing, making late spring generally favorable for outdoor pursuits. Summer (June-August) features the East Asian summer monsoon with southeasterly winds from the Pacific, bringing cleaner maritime air and frequent rainfall that effectively scavenges pollutants. However, high temperatures can accelerate photochemical reactions, occasionally producing ozone peaks during sunny afternoons. Autumn (September-November) begins with relatively good air quality as monsoon rains retreat, but conditions gradually deteriorate as atmospheric stability increases and heating season approaches. The most reliable periods for outdoor activities are typically late spring through early autumn, while sensitive individuals should exercise particular caution during winter inversion episodes and summer ozone peaks.