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Suwon, the capital of Gyeonggi Province in South Korea, occupies a strategic position within the Seoul Capital Area, approximately 30 kilometers south of Seoul. The city's geography is characterized by a basin-like terrain surrounded by low mountains to the east and west, including Gwanggyosan and Chilbosan, which create a semi-enclosed topography that can trap pollutants. Situated at an elevation of around 50-100 meters above sea level, Suwon lies on the Hwanggujicheon and Suwoncheon river systems, though these are relatively small waterways that provide limited air cleansing effects. The city's location places it within the Gyeonggi Industrial Belt, a heavily industrialized region stretching from Incheon to the south of Seoul, where manufacturing, electronics (notably Samsung's semiconductor facilities in Giheung), and automotive industries cluster. This industrial concentration, combined with Suwon's role as a major transportation hub with highways like the Gyeongbu Expressway, exacerbates local emissions. The urban-rural gradient shows dense urban cores transitioning to suburban and agricultural peripheries, particularly to the south where rice paddies and farms dominate, though these agricultural zones contribute minimally to pollution compared to urban and industrial sources. Suwon's proximity to the Yellow Sea to the west influences air quality through sea breezes that can disperse pollutants, but during stagnant conditions, the surrounding mountains and basin effect lead to pollutant accumulation, worsened by transboundary pollution from China carried by prevailing westerly winds across the Korean Peninsula.

In Suwon, air quality follows a distinct seasonal pattern shaped by its continental monsoon climate. Winter, from December to March, marks the peak pollution period due to a combination of factors: increased heating emissions from residential and industrial sources, frequent temperature inversions that trap pollutants near the ground, and reduced wind speeds that limit dispersion. During these months, fine dust (PM2.5) levels soar, exacerbated by transboundary pollution from China, making outdoor activities particularly hazardous, especially for sensitive groups like children, the elderly, and those with respiratory conditions. Spring, from April to June, sees gradual improvement as temperatures rise and monsoon winds begin to stir, though March can still experience high pollution due to lingering cold spells and dust storms from the Gobi Desert. Summer, from July to August, offers the cleanest air as the East Asian monsoon brings heavy rainfall that washes pollutants from the atmosphere, and strong southerly winds enhance dispersion; however, heatwaves can occasionally lead to ozone formation. Autumn, from September to November, starts with relatively good air quality but deteriorates toward late fall as heating resumes and atmospheric stability increases. For health guidance, avoid strenuous outdoor activities in winter and early spring, favor summer and early autumn for exercise, and monitor real-time air quality indexes, using masks and indoor air purifiers during peak pollution months to mitigate risks.