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Huaibei is a prefecture-level city in northern Anhui Province, situated in the heart of the North China Plain, approximately 300 kilometres northwest of Shanghai. Its coordinates place it at a strategic junction where the Huai River basin meets the Yellow River floodplain, creating a predominantly flat terrain with an average elevation of just 30 metres above sea level. This low-lying topography, combined with its inland position far from major coastal influences, significantly impacts air quality by limiting natural ventilation and pollutant dispersion. The city lies within China's intensive agricultural belt, surrounded by vast wheat and corn fields that contribute seasonal agricultural burning emissions, while its urban core hosts general urban pollution sources typical of mid-sized Chinese industrial cities. Huaibei's location in the densely populated Yangtze River Delta economic zone means it experiences regional pollution transport from neighbouring industrial provinces like Jiangsu and Shandong, particularly during prevailing northerly winds. The urban-rural gradient shows concentrated development along the Sui River, which flows through the city centre, but this modest water body provides minimal moderating effect on local microclimate. The surrounding landscape of alluvial plains creates temperature inversion conditions that trap pollutants, especially during calm winter periods when cold air settles in the basin-like terrain.

Huaibei's air quality follows distinct seasonal patterns shaped by its continental monsoon climate. Winter (December-February) brings the worst pollution as temperature inversions trap emissions from heating systems and industrial activities, with January typically experiencing peak concentrations when cold, stagnant air settles over the North China Plain. Sensitive groups should limit outdoor exposure during these months, particularly on windless mornings when fog and haze combine. Spring (March-May) sees gradual improvement as increasing temperatures and more frequent winds from the Mongolian Plateau help disperse pollutants, though March can still experience poor air quality due to dust storms from the Gobi Desert. Summer (June-August) offers the cleanest air as the East Asian monsoon brings southeasterly winds from the ocean, with rainfall helping to wash pollutants from the atmosphere—July and August are ideal for outdoor activities. Autumn (September-November) begins with relatively good conditions in September but deteriorates through October and November as heating season commences and atmospheric stability increases. The transitional periods between seasons often see rapid changes in air quality as wind patterns shift, requiring vulnerable populations to monitor conditions closely. Throughout the year, early mornings typically have higher pollution concentrations than afternoons due to nocturnal temperature inversions.