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Shengli is a significant urban center in China's Shandong Province, situated in the Yellow River Delta region at coordinates 37.4340°N, 118.6746°E. The city occupies a strategic position in eastern China's Bohai Economic Rim, approximately 100 kilometers from the Bohai Sea coastline. This coastal proximity creates a complex air quality dynamic, as marine influences can both disperse pollutants and contribute to humidity-related haze formation. Shengli's terrain is predominantly flat alluvial plain, with elevations averaging just 5-10 meters above sea level, creating conditions conducive to temperature inversions that trap pollutants near ground level. The city lies within the North China Plain's industrial-agricultural transition zone, surrounded by both intensive agricultural lands and industrial facilities. Shengli's urban character reflects its role as an administrative and economic hub for the Yellow River Delta region, with urban expansion creating distinct urban-rural gradients where pollution sources vary significantly. The city's location places it downwind of major industrial zones in western Shandong during prevailing westerly winds, while its position near the Bohai Sea exposes it to maritime air masses that can bring cleaner air or contribute to coastal fog. Surrounding wetlands and agricultural areas generate biogenic emissions that interact with urban pollution, while the flat terrain offers little natural barrier to pollutant transport across the region.

Shengli experiences distinct seasonal air quality patterns shaped by its temperate monsoon climate and geographic position. During winter (December-February), pollution typically peaks due to increased residential heating emissions, frequent temperature inversions that trap pollutants in the shallow boundary layer, and reduced atmospheric mixing. Cold, stagnant conditions often create persistent haze episodes, making these months particularly challenging for outdoor activities. Spring (March-May) brings variable conditions with increasing winds that can disperse pollutants but also lift dust from surrounding agricultural lands during dry periods. The transition season sees occasional improvement as heating emissions decline but may experience pollution spikes during calm periods. Summer (June-August) generally offers better air quality with stronger southeasterly monsoon winds from the Bohai Sea, higher mixing heights, and frequent precipitation that washes pollutants from the atmosphere. However, high humidity can contribute to secondary aerosol formation and reduced visibility. Autumn (September-November) begins with relatively good conditions but transitions toward winter patterns as temperatures drop, heating begins, and atmospheric stability increases. Sensitive groups should limit prolonged outdoor exposure during winter months and on days with visible haze or announced pollution alerts, while summer typically provides the most favorable conditions for outdoor activities. Monitoring local air quality forecasts is essential year-round.