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Dongjiangshui, nestled within Gansu Province in northwestern China, occupies a geographically complex position at coordinates 33.3787°N, 104.9516°E. The city’s elevation, typical of the region, contributes to a thinner atmosphere and potentially reduced dispersion of pollutants. It’s situated within the Wei River basin, a crucial agricultural zone, but also increasingly impacted by industrial development further east towards Lanzhou. The surrounding landscape is characterised by the Loess Plateau, a vast expanse of wind-deposited silt, prone to erosion and dust storms. This terrain significantly influences local air quality, as fine particulate matter (PM10 and PM2.5) is easily mobilized by wind. Dongjiangshui’s relatively small population of 16,816 suggests a less intensely urbanized environment compared to larger Chinese cities, but its proximity to agricultural activity introduces potential sources of ammonia and pesticide drift. The urban-rural gradient is likely pronounced, with air quality deteriorating closer to any local industrial or transport hubs. The city’s position within a valley can also exacerbate pollution episodes by trapping emissions and limiting air circulation, particularly during periods of atmospheric stability. Understanding these geographical factors is crucial for assessing and mitigating air quality challenges in Dongjiangshui.

Air quality in Dongjiangshui follows a distinct seasonal pattern dictated by climate and human activity. Spring (March-May) often sees a surge in pollution due to dust storms originating from the Gobi Desert and increased agricultural burning as farmers prepare fields. Winds are typically strong, transporting these pollutants across the region. Summer (June-August) brings the monsoon season, offering periods of cleaner air as rainfall washes away particulate matter, but also increased humidity which can promote secondary pollutant formation. Autumn (September-November) is often the most challenging period. Temperatures drop, leading to temperature inversions – a stable atmospheric layer trapping pollutants near the ground. Reduced wind speeds further exacerbate the situation, and coal burning for heating begins to increase. Winter (December-February) is cold and dry, with frequent temperature inversions and continued reliance on coal for heating, resulting in consistently poor air quality. Sensitive groups – children, the elderly, and those with respiratory conditions – should limit outdoor activity during autumn and winter. Spring dust storms also necessitate caution. Months offering relatively better air quality are typically July and August, coinciding with monsoon rainfall, though humidity can still be a factor.