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Rucheng, located in Jiangsu Province within China's densely populated East Asia region, occupies a strategic position in the Yangtze River Delta economic zone, approximately 32.2460°N, 120.5910°E. Situated on the northern bank of the Yangtze River, this urban area experiences flat terrain typical of the Jianghuai Plain, with elevations generally below 50 meters above sea level, creating conditions conducive to pollutant accumulation. The city's geography places it within one of China's most industrialized regions, surrounded by extensive agricultural zones that contribute to both urban and rural pollution sources. Rucheng's proximity to major waterways like the Yangtze River influences local humidity and fog formation, while its position between Shanghai to the southeast and Nanjing to the west exposes it to regional pollution transport. The urban-rural gradient shows concentrated development in central areas with gradual transitions to agricultural land, creating mixed emission patterns from vehicles, residential heating, and occasional agricultural burning. This low-lying riverine location, combined with its position in China's eastern industrial belt, creates a geographic context where pollutants from both local urban activities and regional industrial complexes can accumulate, particularly during periods of atmospheric stability.

Rucheng's air quality follows distinct seasonal patterns influenced by East Asian monsoons and local meteorological conditions. During winter (December-February), pollution typically peaks due to increased residential heating emissions, frequent temperature inversions that trap pollutants near the surface, and reduced atmospheric mixing. Cold, stagnant conditions combined with occasional fog create hazardous periods, particularly in January, when sensitive groups should limit outdoor exposure. Spring (March-May) brings gradual improvement as increasing temperatures and more frequent winds disperse pollutants, though occasional dust storms from northern regions can temporarily degrade air quality. The summer monsoon (June-August) provides the cleanest air with abundant rainfall washing pollutants from the atmosphere and strong southeasterly winds ventilating the region, making this the optimal season for outdoor activities. Autumn (September-November) sees a gradual deterioration as monsoon winds weaken, temperatures cool, and atmospheric stability increases, with October often marking the transition toward winter pollution conditions. Throughout the year, sensitive individuals should monitor daily conditions, as rapid changes can occur with shifting wind patterns that either bring clean marine air from the East China Sea or transport industrial pollutants from nearby urban centers.