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Tân Phước Khánh, situated in Binh Duong province, Vietnam (11.0000° N, 106.7167° E), occupies a strategically important position within the rapidly developing Southeast Asian industrial corridor. The city’s geography is characterized by a gently undulating terrain, typical of the Mekong Delta’s fringe, transitioning from fertile agricultural lands to increasingly urbanized zones. Its location, approximately 30 kilometers northeast of Ho Chi Minh City, places it firmly within the city’s sphere of influence, experiencing both the benefits and challenges of proximity to a major metropolitan area. The surrounding landscape is a mosaic of rice paddies, fruit orchards, and burgeoning industrial parks, reflecting Binh Duong’s shift towards manufacturing and export-oriented industries. The Đồng Nai River, a vital waterway, flows nearby, influencing local microclimates and providing a transportation route. Elevation is relatively low, averaging around 10-20 meters above sea level, which can exacerbate air pollution episodes as it limits atmospheric dispersion. The urban–rural gradient is particularly noticeable in Tân Phước Khánh; the city itself is experiencing rapid expansion, with new residential and industrial developments encroaching upon previously agricultural areas. This expansion, coupled with the presence of nearby industrial belts focused on textiles, electronics, and food processing, significantly impacts local air quality, creating a complex interplay between urban growth, industrial emissions, and agricultural practices. The prevailing winds, often influenced by monsoon patterns, play a crucial role in distributing pollutants across the region.

Tân Phước Khánh’s tropical climate dictates a distinct wet and dry season pattern, profoundly influencing its air quality. The dry season, typically spanning from December to April, often witnesses a concerning increase in particulate matter. Reduced rainfall and lower humidity during these months contribute to the accumulation of pollutants, exacerbated by temperature inversions – a meteorological phenomenon where a layer of warm air traps cooler air near the ground, preventing vertical mixing and concentrating emissions. Agricultural burning, a common practice for land clearing and crop residue disposal, also intensifies during this period, releasing significant amounts of smoke and particulate matter. Conversely, the wet season (May to November) brings relief through frequent rainfall, which naturally cleanses the atmosphere. However, heavy downpours can also temporarily worsen air quality by stirring up dust and sediments. The monsoon winds, shifting direction seasonally, play a crucial role in dispersing or concentrating pollutants. Fog, particularly prevalent during the cooler months of December and January, can trap pollutants close to the ground, creating localized air quality challenges. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should exercise caution during the dry season, limiting outdoor activities during peak pollution periods, typically mid-morning and late afternoon. Maintaining indoor air quality through ventilation and air purifiers is also advisable. The transition months of April and October often present unpredictable air quality conditions, requiring vigilance and awareness of local conditions.