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Xinyu is a prefecture-level city situated in central Jiangxi province, East China, positioned at the confluence of the Yuan River and its tributaries within the Gan River basin. The city occupies a transitional zone between the Jiangxi Hills to the east and the Poyang Lake Plain to the north, creating a varied topography of low mountains, rolling hills, and river valleys with an average elevation of approximately 50-100 meters above sea level. Xinyu's urban core is concentrated along the Yuan River, which flows northwestward into the larger Gan River system, providing both water resources and transportation corridors that have historically shaped settlement patterns. The city lies approximately 160 kilometers southwest of Nanchang, Jiangxi's provincial capital, placing it within the broader Central China economic region rather than the heavily industrialized coastal zones. Surrounding landscapes include agricultural areas producing rice, tea, and citrus fruits, with forested hills to the southeast creating a partial natural barrier. This geography creates a complex air quality dynamic: the river valley topography can trap pollutants during stagnant conditions, while proximity to agricultural zones introduces seasonal biomass burning emissions. The urban-rural gradient shows decreasing pollution levels moving southeast toward the more mountainous regions, though Xinyu's position as a regional manufacturing center for steel, machinery, and textiles creates persistent urban pollution sources that interact with the natural basin geography to influence local air quality patterns.

Xinyu experiences distinct seasonal air quality variations shaped by the East Asian monsoon system and local topography. During winter (December-February), cold, dry conditions from the Siberian High pressure system dominate, with frequent temperature inversions in the Yuan River valley trapping pollutants near the surface. This season typically sees the highest pollution concentrations, particularly during calm periods when industrial and residential heating emissions accumulate. Sensitive groups should limit prolonged outdoor exposure during winter mornings when inversions are strongest. Spring (March-May) brings increasing rainfall and shifting wind patterns as the monsoon transitions, with precipitation helping to cleanse the atmosphere but occasional dust events from northern China affecting visibility. Summer (June-August) features the East Asian summer monsoon with southerly winds, higher temperatures, and abundant rainfall that generally improves air quality through dispersion and wet deposition, though high humidity can enhance secondary pollutant formation on stagnant days. Autumn (September-November) begins with relatively clean conditions but transitions to increased pollution as temperatures drop and atmospheric stability returns, with October often experiencing a secondary pollution peak before winter sets in. For optimal outdoor activity, late spring and early autumn offer the most favorable conditions, while sensitive individuals should be particularly cautious during winter inversion episodes and periods of agricultural burning in surrounding rural areas.