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Qiaoyang, nestled within Gansu Province in northwestern China, occupies a geographically complex position along the Silk Road’s historical corridor. Located at coordinates 35.0393°N, 104.1960°E, the city sits at an elevation of approximately 1,700 meters (5,577 feet) amidst the foothills of the Qilian Mountains. This high-altitude setting significantly influences its climate and air quality. The surrounding landscape is characterised by semi-arid grasslands transitioning into desert further west, and loess plateau formations, prone to wind erosion. The nearby Yellow River, though not immediately adjacent, plays a role in regional moisture transport. Qiaoyang’s relatively small population of 14,851 suggests a predominantly rural character, though its position as a transport hub introduces localised industrial and vehicular emissions. The urban-rural gradient is sharp, with agricultural lands dominating the surrounding areas, primarily focused on grain and livestock production. Dust storms originating from the Gobi Desert to the north and west are a frequent occurrence, directly impacting air quality. The terrain funnels winds through the region, exacerbating particulate matter dispersion. The city’s location within a basin can also contribute to temperature inversions, trapping pollutants near the ground.

Qiaoyang experiences a pronounced continental climate, resulting in significant seasonal variations in air quality. Spring (March-May) sees a surge in dust storms originating from the Gobi Desert, dramatically increasing particulate matter concentrations. These storms, coupled with agricultural burning practices as farmers prepare fields, create the year’s poorest air quality. Summers (June-August) are relatively cleaner, benefiting from occasional rainfall and stronger winds that disperse pollutants, though temperatures can still contribute to ozone formation. Autumn (September-November) presents a transitional period; initially clear, air quality deteriorates as heating demand increases with falling temperatures, and coal combustion rises. Winter (December-February) is typically the most challenging period. Cold temperatures lead to increased coal burning for heating, creating persistent smog and temperature inversions that trap pollutants. Low wind speeds further exacerbate the situation. Sensitive groups – children, the elderly, and those with respiratory conditions – should limit outdoor activity during spring and winter. Months to favour for outdoor activity are July and August, though even then, monitoring conditions is advisable. Fog can also be prevalent in winter, trapping pollutants and reducing visibility.