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Quanzhang, nestled within Shanxi Province, China, occupies a geographically complex position at coordinates 35.6576°N, 111.0838°E. The city’s terrain is characterised by the foothills of the Taihang Mountains, contributing to a varied topography of valleys and plateaus. This elevation, averaging around 1,400 meters, influences local wind patterns and atmospheric stability. Quanzhang isn’t directly adjacent to major bodies of water, but relies on regional river systems originating in the mountains for its water supply. The surrounding landscape is a mosaic of agricultural land – primarily wheat and maize – and increasingly, industrial zones focused on coal processing and related manufacturing. Shanxi Province is a major coal-producing region, and Quanzhang’s proximity to these activities significantly impacts its air quality. The urban-rural gradient is relatively sharp; the city centre is densely populated, while the periphery quickly transitions to farmland and forested slopes. This creates localized pollution hotspots within the urban core, exacerbated by limited dispersal due to the surrounding terrain. The valley location can trap pollutants, particularly during periods of calm weather. The geological composition of the region, rich in loess deposits, also contributes to dust storms, further degrading air quality. Understanding this interplay of geography and industry is crucial to addressing Quanzhang’s environmental challenges.

Quanzhang experiences a distinct continental monsoon climate, heavily influencing its air quality throughout the year. Spring (March-May) sees a surge in pollutants due to dust storms originating from the Gobi Desert, combined with increased industrial activity following the winter slowdown. These conditions are worsened by relatively low wind speeds. Summers (June-August) bring the monsoon season, offering periods of cleaner air as rainfall washes away particulate matter, but humidity can also trap pollutants near the ground. Autumn (September-November) is often the most polluted period. Reduced rainfall, temperature inversions forming in the valleys, and increased coal burning for heating create a dangerous cocktail of pollutants. November is particularly problematic. Winters (December-February) are cold and dry, with frequent temperature inversions trapping emissions from heating systems and industry. Wind speeds are generally low, further exacerbating the problem. Sensitive groups – children, the elderly, and those with respiratory conditions – should limit outdoor activity during autumn and winter. Spring dust storms also necessitate caution. Monitoring wind direction is key; winds from the northwest typically bring the worst conditions. Avoiding strenuous activity on high-pollution days and using air purifiers indoors are recommended.