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Pizhou occupies a strategic position in northern Jiangsu province, situated at the confluence of the Grand Canal and the Yi River, which creates a distinctive urban character shaped by waterways and transportation networks. The city lies within the expansive North China Plain, characterized by flat terrain with an average elevation of approximately 30 meters above sea level, creating minimal natural barriers to air movement. This low-lying topography, combined with Pizhou's location in the densely populated Yangtze River Delta region, places it within one of China's most significant industrial and agricultural belts. The surrounding landscape transitions from urban core to intensive agricultural zones growing wheat, corn, and cotton, creating an urban-rural gradient where agricultural burning occasionally contributes to particulate pollution. Proximity to the Yellow Sea, approximately 200 kilometers to the east, provides some maritime influence, though this is moderated by the city's inland position. Pizhou's geographic position along major transportation corridors, including railways and highways connecting Shandong and Jiangsu provinces, results in substantial vehicular emissions, while its industrial base in textiles, machinery, and food processing adds to the urban pollution mix. The flat terrain and river confluence create conditions where pollutants can accumulate, particularly during periods of atmospheric stability, making geographic context crucial for understanding Pizhou's air quality challenges.

Pizhou experiences distinct seasonal air quality patterns shaped by East Asian monsoon circulation and local meteorological conditions. During winter, from December through February, cold, stable air masses frequently create temperature inversions that trap pollutants near the surface, resulting in the year's poorest air quality. Heating demands increase emissions while reduced precipitation limits natural cleansing. Sensitive groups should minimize outdoor activities during these months, particularly on calm, foggy mornings. Spring brings gradual improvement as increasing solar radiation strengthens atmospheric mixing, though March and April can experience occasional dust transport from northern regions. The monsoon transition period in May and June introduces more variable conditions with occasional pollution episodes. Summer offers the cleanest air from July through September, as the East Asian summer monsoon brings southeasterly winds from the ocean, increased rainfall that scrubs pollutants from the atmosphere, and stronger vertical mixing that disperses emissions. This period represents the optimal time for outdoor activities. Autumn sees a gradual deterioration as monsoon winds retreat, atmospheric stability increases, and agricultural burning in surrounding regions can contribute to haze episodes in October and November. Throughout the year, wind patterns play a crucial role, with northerly winds in winter sometimes transporting pollutants from industrial regions to the north, while southerly flows in summer bring cleaner maritime air.