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Tân Châu, nestled in the heart of An Giang province, Vietnam, occupies a strategically vital position within the Mekong Delta. Located at approximately 10.7739° N, 105.2369° E, the city’s geography is profoundly shaped by its proximity to the Mekong River and the vast, fertile floodplains characteristic of the region. The terrain is predominantly flat, with elevations rarely exceeding 5 meters above sea level, making it exceptionally vulnerable to seasonal flooding and influencing atmospheric circulation patterns. Tân Châu sits on the western bank of the Hậu River, a major distributary of the Mekong, facilitating both transportation and agricultural activity. The surrounding landscape is a mosaic of rice paddies, orchards (particularly mango and durian farms), and smaller settlements, creating a distinct urban–rural gradient. To the west, the landscape gradually transitions into more agricultural land, while eastward, the urban fabric of Tân Châu expands. The city’s location within a major agricultural belt means that agricultural practices, including fertilizer use and seasonal burning of crop residues, contribute to local air quality. Furthermore, Tân Châu’s position along key transportation routes, connecting Ho Chi Minh City to the Cambodian border, results in significant vehicular traffic, a key source of pollutants. The flat topography and limited natural barriers can exacerbate the accumulation of pollutants, particularly during periods of stagnant air. The delta's humid subtropical climate, with its distinct wet and dry seasons, further complicates the city’s air quality profile, influencing dispersion patterns and pollutant concentrations.

Tân Châu’s air quality experiences a pronounced seasonal cycle dictated by the region’s 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 and dilutes gaseous pollutants. However, periods of prolonged rainfall can also lead to stagnant conditions and localized flooding, potentially trapping pollutants near the ground. The dry season, from November to April, presents a more challenging scenario. Lower rainfall, coupled with higher temperatures and reduced humidity, promotes the formation of temperature inversions, particularly during the cooler months of December and January. These inversions trap pollutants close to the surface, leading to elevated concentrations. Agricultural burning, a common practice to clear fields for the next planting season, intensifies during the transition from the wet to the dry season (October-November), significantly impacting air quality. Fog, common during the dry season mornings, further restricts pollutant dispersion. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should exercise caution during these periods, limiting outdoor exertion and monitoring for any adverse health effects. The months of January and February often see the most persistent periods of poor air quality due to the combination of temperature inversions and agricultural activities. During the wet season, while overall air quality is generally better, heavy downpours can temporarily increase levels of mold and allergens.