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Nestled in the karst landscape of northeastern Guangxi, Guilin's geography is defined by the Li River valley, where the city sits at approximately 150 meters above sea level, surrounded by dramatic limestone peaks that rise sharply from the basin floor. This topography creates a natural amphitheater that profoundly influences air quality by trapping pollutants under stable atmospheric conditions, particularly during temperature inversions common in autumn and winter. The city lies within the Pearl River Basin, with the Li River flowing through its urban core, providing some natural ventilation but also contributing to humidity that can exacerbate particulate matter formation. Guilin's position as a regional hub in southern China places it between the industrial zones of the Pearl River Delta to the southeast and the agricultural heartlands of Guangxi, resulting in mixed pollution sources including urban emissions from its nearly 5 million residents, seasonal agricultural burning in surrounding rural areas, and some transboundary industrial pollution. The urban-rural gradient is steep, with dense urban development along the river valley giving way rapidly to terraced rice fields and forested hills, yet this proximity means agricultural activities directly impact urban air quality during specific seasons. The city's famous karst towers, while visually stunning, act as barriers to wind flow, reducing natural dispersion of pollutants and creating microclimates where haze can accumulate, particularly in the low-lying areas between hills.

Guilin's air quality follows a distinct seasonal rhythm shaped by the East Asian monsoon and its unique topography. Spring (March-May) brings increasing rainfall and southerly winds from the South China Sea, which help disperse pollutants, making this season generally favourable for outdoor activities despite occasional haze from agricultural preparation burning in surrounding rural areas. Summer (June-August) sees the highest rainfall during the monsoon peak, with frequent showers washing pollutants from the air, resulting in the cleanest conditions of the year—ideal for enjoying Guilin's famous river cruises and outdoor attractions. Autumn (September-November) marks a transition as monsoon rains retreat and temperature inversions become more frequent in the valley, trapping vehicle emissions and construction dust near the surface; October and November often see deteriorating air quality as atmospheric stability increases. Winter (December-February) presents the most challenging conditions, with frequent temperature inversions in the karst basin, low wind speeds, and increased heating emissions creating persistent haze episodes, particularly in January; sensitive groups should limit prolonged outdoor exposure during these months. Throughout the year, morning fog—common in the river valley—can temporarily elevate particulate concentrations until afternoon breezes develop, creating daily patterns where air quality improves as the day progresses.