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Ba Chúc, nestled in the An Giang province of Vietnam, occupies a strategically important position within the Mekong Delta, a vast and fertile alluvial plain. Located approximately 10.5°N, 104.9°E, the city’s geography is dominated by the flat, low-lying terrain characteristic of the delta, with elevations rarely exceeding 5 meters above sea level. This flatness significantly influences air quality, limiting vertical mixing and potentially trapping pollutants close to the ground, particularly during periods of stable atmospheric conditions. The city sits adjacent to the Hau River, a major distributary of the Mekong, which plays a crucial role in regional transportation and agriculture. Surrounding Ba Chúc is a mosaic of rice paddies, fruit orchards, and aquaculture farms, forming a predominantly rural landscape. While Ba Chúc itself is a small urban center, it’s situated within a broader agricultural zone, and the prevailing winds often carry agricultural emissions – including smoke from seasonal burning practices – towards the city. The urban–rural gradient is gradual, with agricultural activities directly impacting the immediate vicinity. The delta’s climate, defined by a monsoon season and a distinct dry season, further shapes the local environment. The proximity to the Mekong River and its associated waterways contributes to high humidity, which can affect the dispersion of airborne pollutants. The relatively flat topography and dependence on agricultural practices create a unique set of challenges for maintaining good air quality in Ba Chúc.

Ba Chúc’s air quality experiences a distinct seasonal cycle dictated by the region’s tropical monsoon climate. The wet season, typically spanning from May to October, brings frequent rainfall and increased humidity, generally leading to improved air quality as precipitation washes away particulate matter. However, periods of prolonged rainfall can also result in stagnant air and localized fog, which can trap pollutants. The dry season, from November to April, presents a more complex picture. Lower rainfall and higher temperatures often lead to increased agricultural burning, a common practice for land clearing and crop residue disposal. This burning releases significant amounts of particulate matter and other pollutants, contributing to poorer air quality during these months. Temperature inversions, where cooler air is trapped beneath a layer of warmer air, are more frequent during the dry season, further hindering vertical mixing and concentrating pollutants near the ground. November and December often see the highest levels of agricultural smoke, while February and March can experience increased dust due to drier conditions. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should exercise caution during the dry season, limiting outdoor activities during peak burning periods and seeking shelter indoors when air quality is visibly affected. The monsoon winds, while generally beneficial for dispersion, can occasionally carry pollutants from neighboring agricultural areas, impacting Ba Chúc’s air quality even during the wet season.