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Gimpo, situated in Gyeonggi Province of South Korea, occupies a strategically significant position in the northwest of the Seoul Capital Area, approximately 30 kilometers west of central Seoul. The city's geography is characterized by relatively flat terrain with an average elevation of around 20 meters above sea level, nestled between the Han River to the north and the Yellow Sea to the west. This coastal proximity creates a unique microclimate where marine influences moderate temperatures but also contribute to humidity and occasional sea fog. Gimpo's urban character blends suburban residential zones with expanding commercial districts, positioned along the critical transportation corridor connecting Seoul to Incheon's international port and industrial complexes. The city lies within the broader Seoul Metropolitan Airshed, where regional pollution accumulates due to topographic constraints—specifically, mountains to the east and north that trap airborne pollutants under stable atmospheric conditions. Surrounding landscapes include agricultural plains to the south, part of Korea's traditional rice-growing regions, and the Gimpo International Airport area to the east, which adds transportation-related emissions. The urban-rural gradient shows increasing density toward eastern borders with Seoul and Incheon, placing Gimpo directly in the path of westerly winds that can transport industrial emissions from China's Shandong Peninsula across the Yellow Sea. This geographic positioning makes Gimpo particularly vulnerable to transboundary pollution events, especially during spring when dust storms from the Gobi Desert combine with local urban emissions from vehicle traffic and construction activities.

Gimpo's air quality follows distinct seasonal patterns shaped by East Asian monsoons and regional meteorology. During winter (December-February), cold, stagnant conditions frequently lead to temperature inversions that trap pollutants near the surface, resulting in elevated particulate matter levels; January typically sees the worst air quality, making outdoor activities challenging, especially for sensitive groups like children and the elderly who should limit exposure. Spring (March-May) brings variable conditions: while increased wind from the west can disperse local emissions, it also carries yellow dust from Mongolian deserts, creating hazardous episodes in April that require mask usage and indoor air purifiers. Summer (June-August) offers relief with the East Asian monsoon bringing clean oceanic air from the south, though high humidity can occasionally combine with vehicle emissions to form ground-level ozone on hot, sunny days in July. Autumn (September-November) generally provides the cleanest air, particularly in October when cool, dry winds from the north sweep through the region, making it the optimal season for outdoor recreation. Throughout the year, sensitive individuals should monitor real-time air quality indices, as sudden deteriorations can occur during windless periods or when agricultural burning peaks in surrounding regions during harvest seasons.