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Kyŏngju, nestled in North Gyeongsang Province of southeastern South Korea, occupies a distinctive geographic position that shapes its urban character and air quality patterns. Situated approximately 55 kilometers inland from the East Sea, the city lies within the Gyeongju Basin, surrounded by the Taebaek Mountains to the east and the Sobaek Mountains to the west, creating a partially enclosed topographic setting. This basin geography, with elevations ranging from 20 to 50 meters above sea level, can trap pollutants under certain meteorological conditions, though the city's moderate size and historical preservation as a UNESCO World Heritage site limit intense industrialisation. Kyŏngju's urban-rural gradient blends ancient cultural sites with modern residential areas, while surrounding regions feature agricultural zones producing rice and fruits, contributing occasional biomass burning emissions. Proximity to the Nakdong River provides some atmospheric moisture but minimal maritime cleansing effects compared to coastal cities. The city's location between major industrial belts—Ulsan's petrochemical complex to the southeast and Pohang's steel industry to the northeast—subjects it to regional pollutant transport, particularly when prevailing winds from the southeast carry industrial emissions into the basin. This geographic context creates a complex air quality dynamic where local urban sources, agricultural activities, and imported industrial pollution interact within a topographically constrained environment.

Kyŏngju's air quality follows a distinct seasonal rhythm influenced by East Asian monsoons and regional meteorology. Winter months from December to February typically experience the poorest air quality, as cold, stable atmospheric conditions foster temperature inversions that trap pollutants within the Gyeongju Basin. These inversions, combined with increased residential heating emissions and occasional biomass burning from surrounding agricultural areas, create persistent haze episodes. Sensitive groups should limit prolonged outdoor exposure during this period, particularly on calm, cold mornings. Spring brings gradual improvement as increasing solar radiation and more frequent winds from March to May help disperse pollutants, though occasional yellow dust storms from the Gobi Desert can cause short-term particulate spikes in April. Summer offers the cleanest air from June to August, as the East Asian summer monsoon delivers consistent southeasterly winds and precipitation that scrub the atmosphere, while higher mixing heights prevent pollutant accumulation. Autumn sees a transitional period from September to November, with generally good air quality early in the season giving way to increasing stagnation as winter approaches. The optimal months for outdoor activities are June through September, when maritime influences dominate, while December through February requires heightened awareness for those with respiratory conditions due to combined local and transported pollution.