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Liaoyuan is a prefecture-level city in southern Jilin Province, China, situated within the East Asian monsoon region at coordinates 42.8880°N, 125.1447°E. The city lies in the transitional zone between the Changbai Mountains to the east and the Songliao Plain to the west, creating a distinctive geographic context that significantly influences its air quality. Liaoyuan's urban core occupies a basin-like terrain at approximately 250-300 meters above sea level, surrounded by low hills that can trap pollutants under certain meteorological conditions. The city is positioned along the Dongliao River, a tributary of the Liao River system, though this modest water body provides limited atmospheric cleansing effects. Regionally, Liaoyuan sits within Northeast China's traditional industrial belt, historically known for coal mining and related industries, though economic restructuring has diversified its urban character. The urban-rural gradient shows a compact central urban area transitioning to agricultural zones growing corn and soybeans, with occasional biomass burning contributing to seasonal pollution. Its location inland, away from major coastal influences, means air masses often stagnate, particularly during winter when cold, dense air settles in the basin. The surrounding landscape—a mix of cultivated plains and forested foothills—creates microclimates that interact with urban emissions from transportation, residential heating, and residual industrial activities, making geographic position a key determinant of air quality patterns.

Liaoyuan's air quality follows a pronounced seasonal rhythm shaped by the East Asian monsoon and local topography. Winter (December-February) brings the worst pollution, as cold air inversions trap emissions from coal-fired heating systems in the basin, with January typically seeing peak concentrations; sensitive groups should limit outdoor exertion during these months. Spring (March-May) offers gradual improvement as temperatures rise and winds increase, though March-April can experience dust storms from the Mongolian Plateau, temporarily elevating particulate levels. Summer (June-August) provides the cleanest air, with monsoon rains from the southeast scrubbing pollutants and convective mixing dispersing emissions; this is the ideal season for outdoor activities, though occasional high humidity can enhance ozone formation on hot days. Autumn (September-November) sees a deterioration as heating season begins and atmospheric stability returns, with October-November often marked by increased particulate matter from agricultural burning in surrounding rural areas. Throughout the year, calm wind conditions—common in the sheltered basin—exacerbate pollution buildup, while fog episodes in late autumn and winter can combine with pollutants to create haze. Health guidance emphasizes that children, elderly residents, and those with respiratory conditions should monitor air quality forecasts closely during late autumn through winter, use air purifiers indoors, and schedule outdoor activities for midday in summer when dispersion is optimal.