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Zhaoyu, nestled within Shanxi Province in China, occupies a geographically complex position at coordinates 37.3512°N, 112.3193°E. The city’s terrain is characterised by the loess plateau, a landscape sculpted by centuries of wind and water erosion, resulting in undulating hills and relatively flat plains. This geological foundation contributes to dust storms, a significant factor influencing local air quality. Zhaoyu’s elevation, averaging around 1,500 meters above sea level, impacts atmospheric circulation and temperature gradients, potentially trapping pollutants. The Fen River flows nearby, but its capacity to naturally cleanse the air is limited given the surrounding industrial activity. Shanxi Province is a major coal-producing region, and Zhaoyu is situated within a broader industrial belt focused on energy production and heavy manufacturing. This proximity to sources of particulate matter and gaseous emissions is a primary driver of air pollution. The urban-rural gradient is relatively sharp; transitioning quickly from denser built-up areas to agricultural lands dominated by wheat and maize cultivation. This gradient influences pollutant dispersion, with rural areas sometimes experiencing downwind effects from Zhaoyu’s emissions. The city’s location within a basin further exacerbates pollution potential, hindering air mass movement and promoting pollutant accumulation.

Zhaoyu experiences a distinct continental monsoon climate, heavily influencing its air quality throughout the year. Spring (March-May) sees a surge in dust storms originating from the Gobi Desert, carried by prevailing winds, dramatically worsening particulate matter levels. This is a period to avoid strenuous outdoor activity, particularly for those with respiratory conditions. Summers (June-August) bring increased rainfall, offering some temporary relief through pollutant washout, but high temperatures can also promote ozone formation. Autumn (September-November) is often considered the most pleasant time for air quality, with cooler temperatures and reduced dust, though coal combustion for heating begins to increase pollution. Winter (December-February) is the most challenging season. Cold temperatures lead to increased coal burning for residential and industrial heating, coupled with temperature inversions – a common phenomenon in the basin – trapping pollutants near the ground. These inversions create stagnant air conditions, leading to prolonged periods of poor air quality. Sensitive groups, including children, the elderly, and individuals with pre-existing heart or lung conditions, should limit outdoor exposure during winter months and consider using air purifiers indoors. Fog, frequent in winter, further exacerbates particulate matter concentrations.