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Goyang is a major satellite city in South Korea's Gyeonggi Province, strategically positioned just northwest of Seoul along the Han River basin. This location places it within the expansive Seoul Capital Area, one of the world's most densely populated metropolitan regions, creating a complex urban geography that significantly influences air quality. The city's terrain is characterized by relatively flat plains interspersed with low hills, with elevations generally ranging from 20 to 100 meters above sea level, though it borders the higher terrain of the Gwangju Mountains to the southeast. Goyang's proximity to the Han River provides some natural ventilation, but its position downwind from Seoul's urban core means it frequently receives transported pollution from the capital's dense traffic, industrial activities, and energy production. The city itself has transformed from agricultural hinterland to a mixed urban landscape featuring residential developments, commercial districts, and light industrial zones, creating local emission sources while maintaining some green spaces like Ilsan Lake Park. This urban-rural gradient means Goyang experiences both locally generated pollution from vehicles and heating systems, and regional pollution transported from Seoul's massive emission sources. The surrounding landscape of the Gyeonggi plains allows for pollutant dispersion under favorable wind conditions, but the basin-like topography of the broader Seoul region can trap pollutants during temperature inversions, particularly in winter. Goyang's location within South Korea's northwest industrial belt means it's affected by emissions from nearby manufacturing and power generation facilities, while its position relative to the Yellow Sea influences how maritime winds might occasionally bring cleaner air or, conversely, transport pollution from China's industrial regions under specific meteorological conditions.

Goyang's air quality follows distinct seasonal patterns shaped by Korea's temperate climate with four pronounced seasons. Spring (March-May) brings variable conditions as warming temperatures reduce heating emissions but increasing winds can transport dust from China's Gobi Desert during yellow dust events, typically peaking in March and April. These Asian dust storms combine with local pollutants to create hazardous episodes where sensitive groups should limit outdoor exposure and use high-efficiency masks. Summer (June-August) offers generally better air quality due to the East Asian monsoon bringing cleansing rains and southerly winds that disperse pollutants, though occasional heat waves can increase ozone formation from vehicle emissions. The monsoon period from late June through August provides the cleanest air for outdoor activities. Autumn (September-November) begins with relatively good conditions but deteriorates as temperatures drop, with October often seeing increased pollution due to agricultural burning in surrounding regions and reduced dispersion as winds calm. Winter (December-February) presents the most challenging season as temperature inversions trap pollutants in the cold, stagnant air, exacerbated by increased emissions from heating systems. January typically sees peak pollution levels when high-pressure systems create prolonged inversion layers, making early mornings particularly hazardous. Sensitive individuals should monitor real-time air quality indices during winter mornings, avoid strenuous outdoor activities when pollution is high, and ensure proper ventilation when using indoor heating systems. The seasonal transition periods of late autumn and early spring offer moderate conditions suitable for most outdoor activities with proper monitoring.