Leshou Air Quality Index (AQI)

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Leshou, a small city nestled within Hebei Province, China, occupies a crucial position in the North China Plain. Located at coordinates 38.1822° N, 116.1108° E, the city’s terrain is largely flat, characteristic of this alluvial plain formed by the Hai River basin. The surrounding landscape is a mix of intensive agriculture – primarily wheat and maize – and increasingly, peri-urban industrial development. Leshou’s elevation is relatively low, around 20-30 meters above sea level, contributing to potential temperature inversions that trap pollutants. The city isn’t directly adjacent to a major body of water, though the Hai River and its tributaries are within reasonable proximity, influencing local humidity. Leshou sits within a broader industrial belt stretching across Hebei, a region historically focused on steel, cement, and petrochemical production. This proximity is a significant factor in its air quality challenges. The urban-rural gradient is becoming blurred as Leshou expands, with agricultural land rapidly converted to residential and industrial uses. This land-use change contributes to dust and particulate matter, alongside emissions from industry and transportation. The city’s location downwind of larger industrial centres further exacerbates pollution levels, making it a receptor of regional emissions.

Leshou’s air quality follows a distinct seasonal pattern. Winter, from November to March, is typically the most polluted period. Cold temperatures create stable atmospheric conditions, frequently leading to temperature inversions where a layer of warm air traps cooler, polluted air near the ground. Reduced wind speeds during these months further hinder dispersion. Coal combustion for heating is a major contributor to particulate matter (PM2.5 and PM10) and sulfur dioxide. Spring (April-May) sees a gradual improvement as temperatures rise and wind activity increases, but dust storms originating from the Gobi Desert can temporarily worsen conditions. Summer (June-August) benefits from monsoon winds that help to flush out pollutants, offering the cleanest air, though high humidity can contribute to secondary pollutant formation. Autumn (September-October) is a transitional period, with decreasing temperatures and wind speeds leading to a resurgence of pollution. Sensitive groups – children, the elderly, and those with respiratory conditions – should avoid strenuous outdoor activity during winter and spring. Monitoring forecasts and limiting exposure on heavily polluted days is crucial. The months of July and August generally offer the most favourable conditions for outdoor activities.