Cuihuangkou Air Quality Index (AQI)

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Cuihuangkou, a town within the sprawling municipality of Tianjin, China, occupies a crucial position in the North China Plain. Located at coordinates 39.5322° N, 117.1917° E, the terrain is largely flat, characteristic of this alluvial plain formed by the Hai River and its tributaries. The town’s elevation is relatively low, contributing to potential air stagnation. Cuihuangkou is situated approximately 20km southeast of the main urban core of Tianjin, and benefits from proximity to the Bohai Sea, roughly 30km distant. This coastal influence moderates temperatures but doesn’t fully negate the effects of continental air masses. Surrounding Cuihuangkou is a mix of agricultural land – primarily wheat and corn – and increasingly, industrial development linked to Tianjin’s port and manufacturing sectors. The urban-rural gradient is pronounced; moving outwards from Tianjin city, one encounters progressively more agricultural activity. This proximity to both industry and agriculture, coupled with the flat topography, creates conditions conducive to pollutant accumulation. The prevailing winds, often from the northwest during colder months, can transport pollutants from inland industrial sources directly over Cuihuangkou. The town’s relatively small population of 51,541 belies its importance as a logistical and economic node within the larger Tianjin metropolitan area, and therefore, its susceptibility to regional air quality issues.

Air quality in Cuihuangkou follows a distinct seasonal pattern. Winter, from November to March, typically sees the poorest conditions. Cold, dry air from Siberia brings increased coal combustion for heating, both domestically and in industry, leading to elevated particulate matter (PM2.5 and PM10) and sulfur dioxide levels. Temperature inversions are common during these months, trapping pollutants near the ground. Spring (April-May) offers a brief respite, with increased rainfall and winds helping to disperse pollutants, though dust storms originating from the Gobi Desert can still impact air quality. Summer (June-August) is generally the cleanest period, benefiting from monsoon winds that flush out pollutants and higher temperatures promoting atmospheric mixing. However, increased humidity can also lead to the formation of secondary pollutants like ozone. Autumn (September-October) sees a gradual deterioration as heating demand increases and monsoon winds weaken. Sensitive groups – children, the elderly, and those with respiratory conditions – should avoid strenuous outdoor activity during winter and autumn. Spring can be unpredictable; monitoring conditions is crucial. Fog, common in the cooler months, exacerbates pollution by reducing visibility and trapping pollutants. Months to favour for outdoor activity are June through August, but even then, monitoring is advised.