Dali Air Quality Index (AQI)

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Dali, nestled within Shaanxi Province in central China, occupies a significant position in the Guanzhong Plain, a historically fertile and densely populated region. Located at coordinates 34.7953°N, 109.9378°E, the city sits at an elevation of approximately 390 meters (1280 feet), contributing to a temperate climate but also influencing air quality through atmospheric stratification. The surrounding landscape is characterised by the Wei River valley, a crucial agricultural zone, and the Qinling Mountains to the south, which act as a partial barrier to air flow. Dali’s urban character is evolving, transitioning from a primarily agricultural centre to a more diversified economy, though coal-dependent industries remain influential in the wider region. The proximity to larger industrial hubs further east and south introduces potential for long-range pollutant transport. The urban-rural gradient is relatively sharp, with agricultural lands immediately surrounding the city giving way to mountainous terrain. This topography can trap pollutants during periods of calm weather, exacerbating local air quality issues. The Wei River, while vital for irrigation, can also contribute to humidity and fog formation, impacting pollutant dispersion. Understanding these geographical factors is crucial for assessing and mitigating air pollution in Dali.

Dali’s air quality follows a distinct seasonal pattern. Spring (March-May) often sees increased dust storms originating from the Gobi Desert, carried by prevailing westerly winds, elevating particulate matter concentrations. This is compounded by agricultural burning as farmers prepare fields for planting. Summer (June-August) typically brings relatively cleaner air, thanks to monsoon rains that effectively wash pollutants from the atmosphere and increased wind speeds. However, high humidity can also foster secondary pollutant formation. Autumn (September-November) is often the most challenging period. Reduced rainfall, temperature inversions, and increased coal combustion for heating create stagnant air conditions, leading to pollutant build-up. November is particularly problematic. Winter (December-February) continues this trend, with persistent cold temperatures and increased reliance on coal for heating. Sensitive groups – children, the elderly, and those with respiratory conditions – should limit outdoor activity during autumn and winter. Springtime dust events also necessitate caution. Monitoring wind direction and avoiding strenuous activity on high-pollution days are recommended. The interplay of meteorological conditions and human activity dictates Dali’s seasonal air quality narrative.