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Tha Bo, nestled in Nong Khai Province, Thailand, occupies a geographically significant position in the Isan region, close to the border with Laos. The city’s coordinates (17.8500, 102.5814) place it on the Mekong River’s banks, a defining feature of its landscape and a crucial element influencing local air quality. The terrain is generally flat, typical of the Khorat Plateau, with a modest elevation that doesn’t significantly impede air circulation but can contribute to temperature inversions. Surrounding Tha Bo are extensive agricultural lands, primarily rice paddies, interspersed with smaller areas of fruit orchards and seasonal crops. While not a major industrial hub itself, Tha Bo serves as a regional market town, receiving goods and traffic from surrounding agricultural areas and cross-border trade. The urban-rural gradient is pronounced; the city centre is relatively compact, quickly transitioning to rural farmland. The Mekong River, while providing a natural boundary and transport route, can also trap pollutants during periods of calm weather. Transboundary haze from agricultural burning in neighbouring countries, particularly during the dry season, is a recurring issue, impacting air quality. The river’s humidity also influences pollutant dispersion, often creating localised high-humidity conditions that affect particle behaviour.

Tha Bo experiences a distinct wet and dry season, heavily influencing its air quality. The dry season, roughly November to April, is typically when pollution peaks. Cooler temperatures and reduced rainfall lead to increased temperature inversions, trapping pollutants near the ground. Agricultural burning, both locally and across the border in Laos, contributes significantly to particulate matter (PM2.5) levels during this period, particularly February to April. The Mekong River’s lower flow can also reduce its capacity to dilute pollutants. The wet season, from May to October, brings relief. Monsoon rains effectively wash away pollutants, resulting in significantly improved air quality. However, increased humidity can promote mould growth, potentially exacerbating respiratory issues. August and September often see localised flooding, which can stir up sediment and contribute to temporary air quality concerns. November marks a transition period, with decreasing rainfall and increasing risk of stagnant air. Sensitive groups – children, the elderly, and those with respiratory conditions – should limit outdoor activity during the peak dry season months. Monitoring wind patterns is crucial; winds from the west often carry haze from regional burning.