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Pencheng, situated in Jiangxi Province of eastern China, occupies a strategic position within the Yangtze River Economic Belt, approximately 100 kilometers south of the provincial capital Nanchang. The city lies in the transitional zone between the Poyang Lake Plain to the north and the mountainous terrain of southern Jiangxi, creating a distinctive urban-rural gradient where dense urban development gradually gives way to agricultural lands and forested hills. At coordinates 29.6760°N, 115.6810°E, Pencheng experiences moderate elevation around 50-100 meters above sea level, with the Gan River flowing nearby—a major tributary of the Yangtze River that influences local humidity patterns. This location places Pencheng within China's traditional 'rice bowl' agricultural region, where surrounding farmlands contribute seasonal biomass burning emissions. The city's position in eastern China's industrial corridor means it receives transported pollution from upstream industrial zones along the Yangtze River valley, particularly during prevailing northerly winds. Urban expansion has created heat island effects that can trap pollutants, while the nearby water bodies moderate temperatures but also contribute to humidity that facilitates secondary aerosol formation. The surrounding landscape of low hills creates partial topographic containment that occasionally limits pollutant dispersion, especially during stable atmospheric conditions.

Pencheng's air quality follows distinct seasonal patterns shaped by East Asian monsoonal circulation and local meteorological conditions. During winter (December-February), cold, stable atmospheric conditions frequently create temperature inversions that trap pollutants near the surface, compounded by increased residential heating emissions and occasional biomass burning from surrounding agricultural areas. This period typically sees the highest pollution concentrations, making outdoor activities less favorable, especially for sensitive groups like children, elderly residents, and those with respiratory conditions who should limit prolonged exposure. Spring (March-May) brings transitional weather with increasing rainfall that helps cleanse the atmosphere, though occasional dust transport from northern regions can temporarily degrade air quality. The summer monsoon (June-August) delivers abundant precipitation and stronger southerly winds that effectively disperse pollutants, creating the cleanest air conditions ideal for outdoor activities. However, high temperatures and humidity can combine with vehicle emissions to form ground-level ozone during afternoon hours. Autumn (September-November) sees gradually deteriorating conditions as rainfall decreases and atmospheric stability increases, with October often marking the transition toward winter pollution patterns. Sensitive residents should monitor local air quality forecasts particularly during winter mornings when inversion layers are strongest, and consider indoor air purification during prolonged stagnant periods.