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Chinju, officially Jinju, is a historic city in South Gyeongsang Province, South Korea, strategically positioned along the Nam River at coordinates 35.2000°N, 128.0833°E. Nestled in the southern part of the Korean Peninsula, Jinju lies approximately 30 kilometers inland from the southern coast, placing it within the broader Nakdong River basin region. The city's terrain is characterized by gentle hills and low mountains, with elevations typically ranging from 50 to 200 meters above sea level, creating a basin-like topography that can trap air pollutants under certain meteorological conditions. Jinju's urban character blends historical preservation with modern development, featuring the iconic Jinjuseong Fortress along the riverbanks while expanding into surrounding suburban areas. The city sits at the crossroads of agricultural zones to the west and industrial corridors to the east, particularly near Changwon's industrial complex approximately 40 kilometers away. This proximity to industrial activity, combined with local urban emissions from transportation and residential heating, creates a complex air quality profile. The Nam River flowing through the city provides some natural ventilation but also contributes to humidity that can interact with pollutants. Jinju's position in the southern region means it experiences both continental and maritime influences, with air masses arriving from China across the Yellow Sea to the west and cleaner Pacific air from the east, creating variable pollution transport patterns throughout the year.

Jinju's air quality follows distinct seasonal patterns influenced by East Asian monsoons and local meteorological conditions. During winter (December-February), cold, stable atmospheric conditions frequently create temperature inversions that trap pollutants near the surface, particularly from residential heating systems using fossil fuels. This season typically sees the highest pollution concentrations, especially during calm, high-pressure systems when winds from the northwest can transport additional pollutants from industrial regions. Spring (March-May) brings variable conditions with increasing temperatures and occasional yellow dust events from the Gobi Desert, though Jinju's southern location provides some protection compared to northern Korean cities. The monsoon season arrives in summer (June-August) with heavy rainfall that effectively scrubs pollutants from the atmosphere, resulting in the cleanest air of the year despite higher temperatures that can increase ozone formation on sunny days. Autumn (September-November) features generally good air quality with moderate temperatures and breezy conditions, though occasional agricultural burning in surrounding regions can create temporary pollution spikes. Sensitive groups including those with respiratory conditions should minimize outdoor activities during winter inversion periods and spring dust events, while summer offers the most favorable conditions for outdoor exercise. Monitoring local air quality forecasts is particularly important during transitional months when pollution patterns can shift rapidly with changing weather systems.