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Lingquan, nestled in the southwestern reaches of Shanxi Province, China, occupies a geographically complex position within the Loess Plateau. Located at approximately 36.9985° N, 110.8417° E, the city sits at an elevation of around 1,350 meters (4,430 feet), contributing to a cooler climate and influencing atmospheric stability. The surrounding landscape is dominated by rolling hills and loess deposits, characteristic of the plateau, with sparse vegetation cover. This terrain, while visually striking, presents challenges for air quality. The Loess soil is prone to wind erosion, contributing particulate matter to the atmosphere, particularly during drier periods. Lingquan’s proximity to the Taiyuan industrial belt, roughly 150 kilometers to the northeast, means it is susceptible to long-range transport of pollutants. Agricultural zones, primarily focused on wheat and corn cultivation, contribute to seasonal emissions from fertilizer use and agricultural burning, though these are generally less impactful than industrial sources. The urban–rural gradient around Lingquan is relatively gradual, with small villages and agricultural land blending into the city’s periphery. The city itself exhibits a compact urban form, with limited sprawling development. The lack of significant bodies of water nearby—the nearest substantial river being several kilometers away—further reduces natural air purification processes, exacerbating the impact of regional pollution sources and local emissions. Topography creates localized valleys that can trap pollutants, especially during periods of low wind speed and temperature inversions.

Lingquan’s air quality follows a distinct seasonal pattern dictated by regional weather systems and local conditions. Winter (November – February) consistently presents the most challenging period. Cold air masses, coupled with frequent temperature inversions—where a layer of warm air traps cooler air near the ground—lead to stagnant air and pollutant accumulation. Reduced sunlight hours also limit photochemical breakdown of pollutants. Agricultural burning, though regulated, can still occur in surrounding rural areas, adding to the particulate load. Spring (March – May) brings a gradual improvement as temperatures rise and winds increase, dispersing pollutants. However, dust storms originating from the Gobi Desert and the Loess Plateau frequently impact Lingquan during this season, significantly degrading air quality. Summer (June – August) generally sees the best air quality due to monsoon rains which effectively ‘wash’ pollutants from the atmosphere and stronger winds. However, periods of high humidity can create stagnant conditions. Autumn (September – October) is a transitional period, with decreasing rainfall and increasing temperatures, often leading to a gradual decline in air quality as winter approaches. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should exercise caution during winter and spring, limiting outdoor activity on days with visibly hazy conditions. During the dust storm season, wearing a high-quality mask is recommended. Maintaining indoor air quality through ventilation and air purifiers is also advisable, particularly during periods of elevated pollution.