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Huai Yot, nestled in the Trang province of southern Thailand, occupies a geographically significant position within the Malay Peninsula. Located at approximately 7.7894° N, 99.6347° E, the town’s setting is characterized by a gently undulating terrain, transitioning from coastal plains to low-lying hills. The surrounding landscape is predominantly rural, a mosaic of rubber plantations, oil palm estates, and traditional rice paddies – a defining feature of Trang’s agricultural economy. Huai Yot itself is a relatively small urban centre, exhibiting a clear urban–rural gradient; the town’s influence diminishes rapidly as one moves outwards, giving way to the pervasive agricultural landscape. The Andaman Sea lies a short distance to the west, influencing local weather patterns and providing a degree of maritime influence. Elevation is generally low, rarely exceeding 30 meters above sea level, which can exacerbate the trapping of pollutants under certain meteorological conditions. While not directly adjacent to major industrial belts, the region experiences agricultural burning practices, particularly during the dry season, contributing to localized air quality concerns. The town’s position within a humid tropical climate zone means high temperatures and humidity are prevalent, impacting pollutant dispersion and potentially increasing the formation of secondary pollutants. The proximity to extensive rubber and palm oil cultivation means that volatile organic compounds (VOCs) from these crops can also play a role in local air chemistry, though typically at lower concentrations than industrial emissions.

Huai Yot’s air quality is intrinsically linked to its tropical climate, exhibiting a distinct wet and dry season cycle. The dry season, typically spanning from February to April, presents the most significant air quality challenges. Reduced rainfall and lower humidity contribute to a decrease in pollutant washout, allowing particulate matter to accumulate. Agricultural burning, a common practice for land clearing and crop residue disposal, intensifies during this period, releasing significant amounts of smoke and particulate matter into the atmosphere. Temperature inversions, where a layer of warm air traps cooler air near the ground, are also more frequent during the dry season, further hindering vertical mixing and concentrating pollutants. The monsoon season, from May to October, brings increased rainfall and higher humidity, naturally cleansing the air and dispersing pollutants. Stronger winds associated with the monsoon also aid in ventilation. November to January represents a transitional period, with gradually decreasing rainfall and increasing temperatures, leading to a slow return of drier conditions and a potential for localized air quality degradation. 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 smoke is prevalent. Maintaining awareness of local conditions and avoiding areas with visible smoke is crucial for minimizing exposure. The increased humidity during the monsoon season generally provides a respite, but occasional fog can still reduce visibility and trap pollutants in localized areas.