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Lingshou County, nestled within Hebei Province, China, occupies a geographically complex position in the foothills of the Taihang Mountains. Located at coordinates 38.3064° N, 114.3783° E, the terrain is predominantly mountainous and hilly, rising in elevation as one moves westward towards the mountain range. This topography significantly influences local air quality, creating pockets where pollutants can become trapped. The county’s population of approximately 62,713 is distributed across a landscape transitioning from rural agricultural areas in the east to more rugged, less populated regions in the west. Lingshou is not directly adjacent to major bodies of water, but benefits from smaller rivers and streams originating in the mountains. However, its proximity to the larger Jing-Jin-Ji metropolitan region and associated industrial belts to the north and east is a key factor in its air quality challenges. The urban-rural gradient is pronounced; the county seat exhibits denser development and higher concentrations of traffic, while surrounding villages remain largely agrarian. Dust from construction, particularly related to quarrying – a significant local industry – contributes to particulate matter pollution. The prevailing winds, often originating from the northwest, can carry pollutants from larger industrial centres towards Lingshou, exacerbating air quality issues.

Lingshou experiences a typical temperate monsoon climate, resulting in distinct seasonal air quality patterns. Spring (March-May) often sees increased dust storms originating from the Gobi Desert, carried by prevailing winds, elevating particulate matter concentrations. This is compounded by agricultural burning as farmers prepare fields. Summer (June-August) brings the East Asian monsoon, offering periods of cleaner air due to rainfall washing away pollutants and increased wind speeds dispersing them. However, high temperatures and humidity can also promote the formation of ozone. Autumn (September-November) is often the most challenging period. Reduced rainfall, coupled with temperature inversions – a common phenomenon in the region where a layer of warm air traps cooler, polluted air near the ground – leads to stagnant air and pollutant accumulation. Heating demand begins to rise, increasing coal combustion. Winter (December-February) sees the lowest temperatures and the highest reliance on coal for heating, resulting in consistently poor air quality. Sensitive groups, including children, the elderly, and those with respiratory conditions, should limit outdoor activity during autumn and winter. Spring dust storms also necessitate caution. Months of July and August generally offer the most favourable conditions for outdoor activity, though ozone levels should still be monitored.