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Yangshuwa, nestled within Henan Province, China, occupies a position on the North China Plain, at coordinates 34.7647°N, 111.7603°E. The city’s terrain is largely flat, characteristic of the alluvial plains formed by the Yellow River, though subtle undulations exist. With an elevation of approximately 60-70 meters above sea level, Yangshuwa benefits from relatively mild temperature gradients but is susceptible to stagnant air masses. The surrounding landscape is dominated by intensive agricultural zones, primarily wheat and maize cultivation, interspersed with smaller industrial clusters focused on food processing and light manufacturing. The proximity to larger industrial hubs within Henan, such as Zhengzhou, contributes to regional pollution transport. The urban-rural gradient is fairly sharp; Yangshuwa itself is a relatively small city with a population of around 35,914, quickly transitioning to farmland. This proximity to agricultural land introduces potential for seasonal burning of crop residue, a significant localised source of particulate matter. The lack of significant topographical features hinders natural dispersion of pollutants, making Yangshuwa vulnerable to air quality issues, particularly during periods of low wind speed. The Yellow River, while not immediately adjacent, influences regional humidity and can contribute to fog formation, trapping pollutants near the ground.

Yangshuwa’s air quality follows a distinct seasonal pattern. Spring (March-May) often sees a deterioration due to dust storms originating from the Gobi Desert, carried eastward by prevailing winds, and increased agricultural burning as fields are prepared for planting. These conditions elevate particulate matter concentrations. Summer (June-August) brings the influence of the East Asian monsoon, offering periods of cleaner air with increased rainfall to wash away pollutants, but also high humidity which can foster secondary pollutant formation. Autumn (September-November) is typically the most challenging period. Reduced rainfall, temperature inversions, and the burning of crop residue after harvest combine to create stagnant conditions and high pollution levels. November is often the worst month. Winter (December-February) sees reduced agricultural activity, but coal combustion for heating becomes a dominant pollution source, alongside continued industrial emissions. Low wind speeds and frequent temperature inversions exacerbate the problem. Sensitive groups – children, the elderly, and those with respiratory conditions – should limit outdoor exertion during autumn and winter. Spring dust storms also necessitate caution. Monitoring wind direction and avoiding peak pollution periods are crucial for maintaining health.