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Wafangdian is a county-level city in Liaoning Province, China, situated on the Liaodong Peninsula in East Asia. Its coordinates at 39.6271°N, 121.9796°E place it approximately 100 kilometers northeast of Dalian, a major port city on the Yellow Sea, and within the broader Bohai Economic Rim—a heavily industrialized region. The city's terrain is characterized by low hills and plains, with an average elevation around 50 meters above sea level, creating a relatively flat urban landscape that can trap pollutants. Wafangdian lies inland from the coast, about 30 kilometers from the Bohai Sea to the west, which moderates its climate but also exposes it to maritime influences that can disperse or concentrate air pollution depending on wind patterns. The surrounding area blends urban development with agricultural zones, particularly for grain and fruit production, contributing to particulate matter from farming activities. As part of Liaoning's industrial belt, Wafangdian hosts manufacturing and processing industries, including machinery and textiles, which emit pollutants like PM2.5 and sulfur dioxide. Its location in a basin-like setting, flanked by gentle slopes, can lead to temperature inversions that worsen air quality by preventing pollutant dispersion. The urban–rural gradient shows denser central areas with higher traffic emissions, transitioning to outskirts with mixed land use. Proximity to major cities like Dalian and Shenyang means regional pollution transport, especially during prevailing northwesterly winds in winter, exacerbates local air quality issues. This geographic context makes Wafangdian vulnerable to both local industrial emissions and regional haze, impacting respiratory health for its population of over 900,000.

In Wafangdian, air quality follows a distinct seasonal pattern influenced by the temperate monsoon climate of Northeast China. Winter, from December to February, brings the worst pollution due to coal burning for heating, industrial emissions, and frequent temperature inversions that trap pollutants near the ground. Cold, stagnant air and low wind speeds, often from the northwest, combine with fog to create persistent haze, making these months particularly hazardous for outdoor activity; sensitive groups like children, the elderly, and those with respiratory conditions should limit exposure and use air purifiers indoors. Spring, from March to May, sees gradual improvement as temperatures rise and winds increase, dispersing pollutants, though dust storms from the Gobi Desert can occasionally spike particulate levels, so monitoring weather forecasts is advised. Summer, from June to August, offers the cleanest air with higher humidity, southeasterly monsoon winds from the Yellow Sea, and frequent rainfall that scrub pollutants from the atmosphere, making it the best season for outdoor pursuits like hiking in nearby hills. Autumn, from September to November, begins with relatively good air quality but deteriorates toward late fall as heating systems restart and atmospheric stability returns, leading to a buildup of pollutants; planning outdoor activities in early autumn is recommended. Throughout the year, weather hazards like fog can reduce visibility and compound pollution effects, so checking local air quality indices before venturing out is crucial for health protection.