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Fuxin is a prefecture-level city in western Liaoning Province, China, situated in the transitional zone between the Northeast China Plain and the Mongolian Plateau. Its coordinates at 42.0220°N, 121.6700°E place it approximately 200 kilometers northwest of Shenyang, within the historic industrial heartland of Northeast China. The city's terrain is characterized by rolling hills and low mountains, with an average elevation around 150 meters above sea level, creating a basin-like topography that can trap pollutants. Fuxin lies near the upper reaches of the Daling River system, though it lacks major water bodies within its immediate urban core, reducing natural ventilation effects. Historically known as a coal mining center, Fuxin's economy has diversified but retains industrial activities including energy production, manufacturing, and chemical processing, contributing to its urban pollution profile. The city exists along an urban-rural gradient where agricultural lands transition into industrial zones, with surrounding areas featuring croplands and grasslands typical of the semi-arid region. Its position inland, away from coastal influences, means it misses the moderating effects of sea breezes that benefit eastern Liaoning cities. The surrounding landscape of low mountains to the northwest can act as a partial barrier to wind flow, particularly during stable atmospheric conditions, exacerbating pollution accumulation. This geographic setting, combined with its industrial legacy and basin topography, creates a challenging environment for air quality management, especially during periods of meteorological stagnation.

Fuxin experiences distinct seasonal air quality patterns driven by its continental monsoon climate with cold, dry winters and warm, humid summers. During winter (December-February), pollution typically peaks due to coal-fired heating systems operating at full capacity, combined with frequent temperature inversions that trap pollutants near the surface. Cold, stagnant air masses often settle in the basin topography, creating persistent haze episodes that can last for days. Sensitive groups should minimize outdoor activities during these months, particularly on calm, overcast days. Spring (March-May) brings gradual improvement as heating demand decreases and increasing wind speeds help disperse pollutants, though dust storms from the Mongolian Plateau can occasionally elevate particulate levels in April. Summer (June-August) offers the cleanest air, with southeasterly monsoon winds bringing moisture and better dispersion, though high temperatures can sometimes lead to ozone formation on sunny afternoons. Autumn (September-November) sees a gradual deterioration as temperatures drop, heating systems restart, and atmospheric stability increases, with October often marking the transition to winter pollution conditions. The best months for outdoor activities are typically June through August, while December through February require the most caution. Sensitive individuals, including those with respiratory or cardiovascular conditions, should monitor local air quality reports year-round, use air purifiers indoors during pollution episodes, and schedule outdoor exercise for midday when dispersion is often better.