Cửa Lô Air Quality Index (AQI)

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Cửa Lô, a coastal town in Nghe An province, Vietnam, occupies a geographically significant position along the Gulf of Tonkin. Situated at coordinates 18.8167°N, 105.7167°E, the town’s terrain is characterized by a low-lying coastal plain, gradually rising inland towards the foothills of the Annamite Range. This proximity to the sea profoundly influences its climate and, consequently, its air quality. The surrounding landscape is a mix of sandy beaches, mangrove forests, and agricultural land, primarily dedicated to rice cultivation and aquaculture. Cửa Lô serves as a crucial fishing port and increasingly, a tourist destination, experiencing a noticeable urban-rural gradient as development concentrates near the coastline. While not heavily industrialized itself, the town is within reach of larger industrial zones further north in Nghe An and Ha Tinh provinces, potentially contributing to regional pollution transport. The prevailing winds, often influenced by the monsoon patterns, play a key role in dispersing or concentrating pollutants. The relatively flat topography offers limited natural dispersion, meaning pollutants can accumulate, particularly during periods of calm weather. The town’s location makes it vulnerable to both local emissions and the advection of pollutants from surrounding areas, impacting the respiratory health of its approximately 11,884 residents.

Cửa Lô experiences a tropical monsoon climate, dictating a distinct wet and dry season pattern that heavily influences air quality. The dry season, from November to April, typically sees clearer skies but can also experience increased particulate matter from dust and agricultural burning. February and March are often the driest months, with stagnant air potentially trapping pollutants. The wet season, spanning May to October, brings frequent rainfall which generally washes away pollutants, leading to improved air quality. However, this period is also prone to typhoons and heavy storms, which can stir up dust and debris, temporarily worsening conditions. August and September, peak typhoon months, require heightened awareness. Temperature inversions, common during the cooler months, can trap pollutants near the ground, exacerbating respiratory issues. The southwest monsoon, bringing moisture from the Gulf of Tonkin, dominates the wet season, while the northeast monsoon influences the drier months. Sensitive groups – children, the elderly, and those with pre-existing respiratory conditions – should limit outdoor activity during periods of high humidity and stagnant air, particularly in the early mornings and evenings. Monitoring weather forecasts and avoiding areas near agricultural burning are crucial preventative measures.