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Liaoyang occupies a strategic position in central Liaoning province, situated approximately 70 kilometers south of Shenyang along the fertile Liao River plain. This ancient city, with origins dating back over 2,400 years, lies at coordinates 41.2790°N, 123.1760°E, placing it firmly within Northeast China's industrial heartland. The urban area rests at a modest elevation of 30-50 meters above sea level, nestled between the Qianshan Mountains to the southeast and the vast Northeast China Plain extending northwestward. Liaoyang's geography creates a distinctive air quality profile shaped by its position within the heavily industrialized Liaoning corridor, where manufacturing centers, steel plants, and chemical facilities cluster along transportation routes. The Liao River flows through the city, providing some atmospheric moisture but insufficient to significantly disperse pollutants given the region's topography. Surrounding agricultural lands, particularly to the west and north, contribute occasional biomass burning emissions during harvest seasons. The urban-rural gradient shows decreasing pollution levels moving outward from the dense central districts toward peripheral townships, though regional industrial emissions affect the entire basin. This terrain configuration, with mountains partially enclosing the plain, can trap air masses and exacerbate pollution accumulation during stagnant weather conditions, making geographic position a crucial determinant of air quality challenges in this historically significant yet industrially active city.

Liaoyang experiences distinct seasonal air quality patterns shaped by Northeast Asia's monsoon climate and regional industrial activity. Winter (December-February) brings the most severe pollution episodes as cold, stable air masses settle over the Liaoning basin, creating frequent temperature inversions that trap emissions from heating systems and industry. January typically sees peak pollution concentrations when residential coal burning peaks and northwest winds carry additional pollutants from upwind industrial zones. Spring (March-May) offers gradual improvement as increasing solar radiation breaks up inversions and southerly winds begin to disperse pollutants, though March can still experience high pollution from dust storms originating in Mongolia and western China. Summer (June-August) provides the cleanest air despite industrial emissions continuing, as the East Asian monsoon brings frequent rainfall that scrubs pollutants from the atmosphere and southeasterly winds provide better ventilation. Autumn (September-November) sees a gradual deterioration as heating season begins and atmospheric stability increases, with October often marking a transition to winter pollution patterns. Sensitive groups including children, elderly residents, and those with respiratory conditions should minimize outdoor activity during winter pollution episodes and on days with visible haze or announced air quality alerts. The most favorable months for outdoor activities are typically June through August, when cleaner air coincides with warmer temperatures.