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Beihu, nestled within Hebei Province, China, occupies a geographically complex position significantly influencing its air quality. Located at approximately 38.1559° N, 114.8090° E, the city sits on a relatively flat alluvial plain formed by the meandering Bei River, a tributary of the Hai River system. This plain is bordered to the north by the Yanshan Mountains, a range that, while providing some scenic backdrop, also contributes to atmospheric stagnation under certain conditions. The surrounding landscape is a mix of agricultural land – primarily wheat and corn cultivation – and increasingly, light industrial zones, reflecting Hebei’s broader economic transition. Beihu’s proximity to the Bohai Sea, roughly 150 kilometers to the east, introduces a maritime influence, though this is often overridden by regional weather patterns. The urban–rural gradient around Beihu is gradual, with small villages and agricultural fields blending into the city’s periphery. The elevation is low, averaging around 30 meters above sea level, which exacerbates the trapping of pollutants, particularly during temperature inversions. The city’s location within the North China Plain, a major industrial and agricultural hub, places it downwind from significant pollution sources in Beijing and Tianjin, making it vulnerable to transboundary pollution events. The flat terrain limits natural ventilation, further compounding air quality challenges. The prevalence of coal-fired heating in surrounding rural areas during winter also contributes to localized pollution spikes.

Beihu’s air quality follows a distinct seasonal pattern dictated by regional meteorology. Winter (November – February) consistently presents the most challenging conditions. Cold air masses, coupled with frequent temperature inversions – where a layer of warm air traps cooler air near the ground – lead to prolonged periods of stagnant air and pollutant accumulation. Agricultural burning, a common practice in surrounding rural areas to clear fields, further degrades air quality during this period. Spring (March – May) brings a gradual improvement as temperatures rise and winds increase, dispersing pollutants. However, dust storms originating from the Gobi Desert frequently impact Beihu during March and April, significantly reducing visibility and increasing particulate matter. Summer (June – August) generally sees the best air quality due to monsoon rains that cleanse the atmosphere and stronger winds. However, periods of high humidity and stagnant conditions can still occur. Autumn (September – October) is a transitional season, with air quality initially improving after the summer rains but gradually declining as temperatures drop and winter approaches. Fog, common in autumn, can trap pollutants and worsen air quality. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should exercise caution during winter and spring, limiting outdoor activity on days with poor visibility or noticeable odors. During dust storm events, wearing a high-quality mask is recommended. Staying indoors with air purifiers can also mitigate exposure.