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Nestled in the heart of Anhui province in eastern China, Bengbu occupies a strategic position along the Huai River, approximately 150 kilometers northwest of Nanjing. This prefecture-level city sits within the expansive North China Plain, characterized by flat to gently rolling terrain with an average elevation of just 20-30 meters above sea level. Bengbu's urban core straddles the Huai River, which flows eastward toward Hongze Lake, creating a distinctive waterfront character while also serving as a historical transportation artery. The city's geography places it within China's crucial agricultural belt—the Huai River Basin—where intensive farming of wheat, rice, and other crops contributes to seasonal agricultural burning and dust. Bengbu's location within the Yangtze River Delta economic zone's northern periphery means it experiences both urban pollution from its own manufacturing sectors (particularly machinery, chemicals, and food processing) and regional transport of pollutants from more industrialized areas downstream. The city's urban-rural gradient shows dense development along the riverbanks transitioning to agricultural lands and smaller towns in surrounding counties. This flat topography, combined with the city's position in a basin-like area of the North China Plain, creates conditions conducive to pollutant accumulation, as there are few natural barriers to disperse emissions. The Huai River's presence provides some moderating influence but also contributes to humidity that can exacerbate particulate matter formation.

Bengbu's air quality follows distinct seasonal patterns shaped by East Asian monsoons and regional meteorological conditions. During winter (December-February), cold, stable air masses from Siberia create frequent temperature inversions that trap pollutants near the surface, compounded by increased coal burning for heating. This season typically sees the highest pollution concentrations, particularly in January and February, when calm winds and foggy conditions prevail. Sensitive groups should limit prolonged outdoor exposure during these months and consider using air purifiers indoors. Spring (March-May) brings gradual improvement as temperatures rise and winds increase, though March and April can experience dust storms from the Gobi Desert and local agricultural burning during planting season. Summer (June-August) offers the cleanest air overall, with the East Asian summer monsoon bringing southeasterly winds that disperse pollutants, though high humidity and heat can occasionally lead to ozone formation on hot, sunny days. Autumn (September-November) begins with relatively good conditions in September but deteriorates through October and November as temperatures drop, heating demands increase, and atmospheric stability returns. The transitional months of October and November often see pollution build-up before winter's peak. For outdoor activities, late spring through early autumn (May to September) generally provides the most favorable conditions, while winter months require precautions, especially for children, elderly residents, and those with respiratory conditions who should monitor daily air quality reports closely.