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Nestled in southeastern Shanxi Province, Jincheng occupies a strategic position within China's Loess Plateau region, approximately 350 kilometers southwest of Beijing. The city sits at an average elevation of 800 meters above sea level, positioned within the Jincheng Basin surrounded by the Taihang Mountains to the east and the Zhongtiao Mountains to the south. This basin topography creates a natural amphitheater that significantly influences air quality patterns. Jincheng lies within China's major coal-producing region, with extensive mining operations and associated industries dotting the surrounding landscape. The urban area transitions gradually into agricultural zones growing wheat, corn, and millet, creating a distinct urban-rural gradient. No major rivers flow through the city center, though several smaller tributaries of the Yellow River system originate in the surrounding mountains. Jincheng's location places it within the industrial heartland of northern China, with proximity to major transportation corridors connecting Shanxi's resource-rich areas to national markets. The basin's enclosed nature, combined with industrial emissions from coal processing, power generation, and manufacturing, creates conditions conducive to pollutant accumulation. The city's geography—shielded by mountains on multiple sides—limits natural ventilation, particularly during periods of atmospheric stability when pollutants become trapped in the valley.

Jincheng's air quality follows a distinct seasonal pattern shaped by its continental monsoon climate and basin geography. Winter (December-February) brings the most challenging conditions, with frequent temperature inversions trapping pollutants close to the ground. Heating demands increase coal combustion, while calm winds and stable atmospheric conditions prevent dispersion. Sensitive groups should limit outdoor activities during these months, particularly during morning hours when inversions are strongest. Spring (March-May) sees gradual improvement as temperatures rise and winds increase, though dust storms from the Loess Plateau can temporarily degrade air quality in March and April. Summer (June-August) offers the cleanest air, with monsoon rains from the southeast helping to wash pollutants from the atmosphere and increased vertical mixing dispersing emissions. This is the optimal season for outdoor activities. Autumn (September-November) begins with relatively good conditions but deteriorates as temperatures drop, heating season commences, and atmospheric stability increases. The transition from October to November typically marks the beginning of the winter pollution buildup. Throughout the year, morning fog can exacerbate pollution visibility and health impacts, particularly in the colder months when it combines with industrial and domestic emissions.