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Thuận Tiến, nestled in the heart of Vĩnh Long province, Vietnam, occupies a geographically significant position within the Mekong Delta. Located at approximately 10.0894° N, 105.8281° E, the town’s terrain is predominantly flat, characteristic of the delta’s alluvial plains formed by the Mekong River’s sediment deposits. The elevation is minimal, rarely exceeding 5 meters above sea level, contributing to a low-lying landscape susceptible to seasonal flooding. The surrounding landscape is a mosaic of rice paddies, fruit orchards (particularly known for its mangoes), and intricate canal systems that define the region’s agricultural character. Thuận Tiến sits close to the Vĩnh Long River, a major distributary of the Mekong, influencing local humidity and temperature patterns. The town’s urban fabric is a blend of traditional Vietnamese architecture and modern development, reflecting its evolving economy. While not directly adjacent to major industrial zones, it’s situated within a broader agricultural belt that experiences pesticide and fertilizer application, potentially impacting air quality. The urban–rural gradient is gradual; Thuận Tiến seamlessly transitions into surrounding agricultural lands, with small villages and farms dotting the landscape. This proximity to intensive agriculture, combined with the flat topography and prevailing wind patterns, can lead to localized air pollution episodes, particularly during periods of burning agricultural waste or fertilizer application. The delta’s humid subtropical climate further complicates air quality, as high humidity can trap pollutants near the ground.

The air quality in Thuận Tiến follows a distinct seasonal pattern dictated by Vietnam’s monsoon climate. The wet season, typically spanning from May to October, brings frequent rainfall and high 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 increased mold spore concentrations. The dry season, from November to April, presents a more complex picture. While wind speeds tend to be higher, temperature inversions are common, particularly during the cooler months (December-February). These inversions trap pollutants close to the ground, exacerbating air quality issues. Agricultural burning, a traditional practice for land clearing and crop residue disposal, is most prevalent during this period, significantly contributing to particulate pollution. Fog, common in the early morning during the dry season, further reduces visibility and traps pollutants. March and April often see a rise in dust and pollen levels as the dry season nears its end and agricultural activities intensify. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should exercise caution during the dry season, particularly during periods of agricultural burning. Limiting outdoor exertion during foggy mornings and avoiding areas with visible smoke are advisable. The monsoon rains offer a respite, but vigilance is still needed, especially concerning mold and dampness-related health concerns. The transition months of April and October can be unpredictable, with fluctuating wind patterns and varying levels of agricultural activity.