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Paju, situated in Gyeonggi Province of South Korea, occupies a strategically significant position just south of the Korean Demilitarized Zone (DMZ), approximately 30 kilometers northwest of Seoul. This city of over 415,000 residents lies within the Han River basin, characterized by gently rolling plains interspersed with low hills, with an average elevation around 50 meters above sea level. Paju's geography creates a distinctive urban-rural gradient: while its southern sectors near Seoul exhibit suburban development, northern areas transition into agricultural zones and protected natural landscapes near the DMZ. The city's proximity to the Imjin River to the west and the Han River to the south influences local microclimates, though these waterways are insufficient to significantly disperse accumulated pollutants. Paju sits within the broader Seoul Capital Area's industrial belt, with manufacturing facilities in nearby cities like Uijeongbu and Goyang contributing to regional air pollution. The city's location in a basin-like topography, surrounded by mountains including the Gwangju Mountains to the east, creates natural barriers that can trap airborne particulates, especially during temperature inversions. This geographic setting, combined with its position downwind from China's industrial northeast during prevailing westerly winds, makes Paju particularly vulnerable to transboundary pollution events that significantly degrade air quality throughout the year.

Paju's air quality follows distinct seasonal patterns influenced by both local emissions and regional meteorological conditions. During winter (December-February), cold, stagnant air frequently settles in the basin topography, creating persistent temperature inversions that trap pollutants near the surface. This season typically experiences the worst air quality, with January and February being particularly problematic months when heating demands increase fossil fuel combustion. Sensitive groups should limit prolonged outdoor exposure during these months and monitor real-time air quality indices. Spring (March-May) brings variable conditions: while increased wind activity from the northwest can disperse local pollution, these same winds often transport yellow dust (Asian dust storms) from Mongolia and northern China, creating episodic spikes in particulate matter concentrations, especially in April. Summer (June-August) offers relatively cleaner air as the East Asian monsoon brings southerly winds from the ocean, increased precipitation that washes pollutants from the atmosphere, and better atmospheric mixing. However, high temperatures can accelerate ozone formation on sunny days. Autumn (September-November) begins with generally good air quality in September but deteriorates through October and November as temperatures drop, atmospheric mixing decreases, and heating season commences. For optimal outdoor activities, late spring (May) and early autumn (September) typically provide the most favorable conditions, though daily monitoring remains essential given the variability of transboundary pollution events.