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Ban Tom Klang, nestled in the Phayao province of northern Thailand, occupies a geographically significant position within the broader Chiang Rai basin. Located at approximately 19.1990° N, 99.8352° E, the town sits at an elevation of around 550 meters above sea level, contributing to a generally cooler climate compared to Thailand’s central regions. The surrounding landscape is dominated by rolling hills and fertile plains, characteristic of the upper Chao Phraya River basin. To the west, the landscape rises towards the Thai-Myanmar border, influencing prevailing wind patterns. The nearby Nam Ou River, a tributary of the Mekong, provides a vital water source and influences local humidity levels. Ban Tom Klang’s urban character is distinctly rural, a small market town serving the surrounding agricultural communities. The primary economic activities revolve around rice farming, maize cultivation, and livestock rearing, with smaller-scale horticulture also present. This agricultural intensity, while supporting the local economy, can contribute to localized air quality concerns, particularly during burning seasons. The urban–rural gradient is gradual; the town seamlessly blends into the agricultural landscape, with scattered villages and farms extending outwards. There are no major industrial belts immediately adjacent to Ban Tom Klang, but the proximity to larger regional centers like Chiang Rai means occasional transport-related pollution can drift into the area. The terrain, with its gentle slopes, can sometimes trap pollutants, especially during periods of low wind speed, impacting local air quality.

Ban Tom Klang’s air quality experiences a distinct seasonal cycle dictated by Thailand’s monsoon climate. The dry season, typically spanning from November to April, presents the most significant air quality challenges. During these months, reduced rainfall and lower humidity create conditions conducive to the accumulation of particulate matter. Agricultural burning, a common practice for land clearing and crop residue disposal, intensifies during this period, releasing significant amounts of smoke and pollutants into the atmosphere. Temperature inversions, where a layer of warm air traps cooler air near the ground, are also more frequent, further exacerbating the problem by preventing pollutants from dispersing. The months of February and March often see the highest levels of concern. Conversely, the wet season (May to October) brings relief. Frequent rainfall effectively washes pollutants from the air, and higher humidity reduces the concentration of particulate matter. Monsoon winds also help to disperse any remaining pollutants. Fog, common during the cooler months, can temporarily reduce visibility and trap pollutants close to the ground. 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. Maintaining indoor air quality through ventilation and air purifiers can also be beneficial. The transition months of April and October represent periods of fluctuating air quality, requiring vigilance and awareness of local conditions.