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Sunch'ŏn occupies a strategic position in South P'yŏngan Province, North Korea, situated approximately 40 kilometers northeast of the capital Pyongyang along the Taedong River basin. The city lies at coordinates 39.4167°N, 125.9333°E, nestled within the western coastal plains of the Korean Peninsula, characterized by relatively flat terrain with gentle undulations and an average elevation around 50 meters above sea level. This low-lying topography, combined with proximity to the Yellow Sea to the west, creates specific microclimatic conditions that influence air quality patterns. Sunch'ŏn forms part of North Korea's industrial heartland, positioned within the Pyongyang-Sunch'ŏn industrial corridor that includes chemical plants, machinery factories, and agricultural processing facilities. The urban area transitions gradually into surrounding agricultural zones dominated by rice paddies and vegetable fields, creating an urban-rural gradient where pollution sources intermix with farmland. The Taedong River flows nearby, providing water resources but also potentially acting as a conduit for industrial emissions. This geographic setting—flat plains with limited natural ventilation, proximity to industrial activity, and coastal influences—creates conditions where pollutants can accumulate, particularly during periods of atmospheric stability, while sea breezes occasionally provide cleansing effects when wind patterns align favorably.

Sunch'ŏn experiences distinct seasonal air quality variations shaped by East Asian monsoon patterns and local meteorological conditions. During winter (December-February), cold temperatures and frequent temperature inversions trap pollutants near the ground, creating the year's worst air quality episodes as heating demands increase emissions from coal-burning and industrial operations. Sensitive groups should limit outdoor activities during these months, particularly on calm, foggy mornings. Spring (March-May) brings gradual improvement as increasing temperatures reduce inversion frequency and occasional rainfall helps cleanse the air, though dust from agricultural activities and regional sandstorms can cause temporary spikes. Summer (June-August) offers the cleanest air overall due to monsoon rains that wash pollutants from the atmosphere and consistent southerly winds that disperse emissions, making this the optimal season for outdoor activities despite high humidity. Autumn (September-November) sees a gradual deterioration as rainfall decreases and temperature inversions begin reestablishing, with burning of agricultural residues potentially contributing to haze episodes. Throughout the year, wind patterns play a crucial role—northwesterly winds in winter often carry industrial emissions from Pyongyang's direction, while summer southerlies bring cleaner maritime air. Sensitive individuals should monitor weather forecasts for calm conditions and plan activities for midday when atmospheric mixing is typically greatest.