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Sawankhalok, nestled within the Sukhothai Province of Thailand, occupies a geographically significant position within the lower northern plains. Located at approximately 17.3160° N, 99.8319° E, the city’s terrain is gently undulating, characteristic of the Central Thai Plain, with elevations rarely exceeding 100 meters above sea level. This low elevation contributes to a tendency for stagnant air conditions, particularly during cooler months. The surrounding landscape is predominantly agricultural, a patchwork of rice paddies and other cultivated fields, interspersed with smaller villages and scattered groves of trees. The Yom River, a vital waterway, flows nearby, influencing local humidity and microclimates. While Sawankhalok itself is a relatively small urban centre with a population of around 17,148, it sits within a broader agricultural region, and its air quality is intrinsically linked to farming practices. The urban–rural gradient is gradual; the city seamlessly blends into the surrounding countryside. Historically a crucial trading hub along the ancient Silk Road, Sawankhalok’s legacy is evident in its ceramics and historical sites. The proximity to larger industrial zones in nearby provinces, though not immediately adjacent, can still contribute to regional pollution transport. The flat topography and prevailing wind patterns often facilitate the movement of pollutants from these distant sources, impacting Sawankhalok’s air quality. The lack of significant topographic barriers means that any emissions, whether local or regional, can readily spread across the area.

Sawankhalok’s air quality follows a distinct seasonal pattern dictated by Thailand’s tropical climate and monsoon cycles. 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 substantial 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 vertical dispersion of pollutants. The months of January and February often experience the poorest air quality due to a combination of these factors. 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 disperse emissions. Fog, particularly in the early morning hours during the cooler months, can temporarily trap pollutants near the ground, creating localized pockets of poor air quality. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should exercise caution during the dry season, limiting outdoor activities on days with visible smoke or haze. Maintaining indoor air quality through proper ventilation and air filtration is also recommended. The transition months of April and October represent periods of moderate air quality, with fluctuating conditions as the climate shifts between dry and wet seasons.