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Qujingpu, nestled within the autonomous region of Ningxia in northwestern China, presents a unique geographic context influencing its air quality. Located at coordinates 38.0814, 106.0489, the city sits at an elevation that contributes to atmospheric stability, potentially trapping pollutants. The surrounding landscape is dominated by the Loess Plateau, a vast expanse of wind-deposited silt, and the foothills of the Helan Mountains to the west. This terrain creates a bowl-like effect, hindering air circulation. While not directly adjacent to a major body of water, Qujingpu relies on the Yellow River for irrigation, supporting agricultural activity in the surrounding plains. The region is increasingly experiencing industrial development, particularly in energy and materials processing, concentrated further east towards Yinchuan, Ningxia’s capital. This proximity to industrial belts is a significant factor in regional air pollution. The urban-rural gradient is relatively sharp; Qujingpu itself is a small city with a population of approximately 28,086, surrounded by extensive agricultural land and sparsely populated rural areas. Dust from the Loess Plateau, combined with emissions from agriculture and industry, creates a complex air quality challenge. The city’s location within a semi-arid climate further exacerbates dust events.

Qujingpu’s air quality follows a distinct seasonal pattern dictated by meteorological conditions and human activity. Spring (March-May) sees a surge in dust storms originating from the Gobi Desert and Loess Plateau, dramatically reducing visibility and increasing particulate matter concentrations. These storms are often associated with strong winds and dry conditions. Summer (June-August) brings some relief, with occasional rainfall helping to suppress dust, but increased agricultural activity – including fertilizer application and crop residue burning – can contribute to localised pollution. Autumn (September-November) is often the most challenging period. Temperature inversions become frequent, trapping pollutants near the ground as heating demand increases in preparation for winter. Calm winds exacerbate this effect. Winter (December-February) is characterised by cold temperatures and increased coal combustion for heating, leading to elevated levels of sulfur dioxide and particulate matter. Sensitive groups – children, the elderly, and those with respiratory conditions – should limit outdoor exposure during spring and autumn. Months to favour for outdoor activity are July and August, though agricultural emissions should still be considered. Fog, common in the cooler months, can also trap pollutants, reducing air quality.