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Rattaphum, nestled within the Songkhla province of southern Thailand (7.1348° N, 100.2565° E), occupies a geographically significant position at the edge of the Kra Isthmus. The city’s terrain is predominantly flat, characteristic of the coastal plains of southern Thailand, with gentle slopes rising towards the interior. This low elevation, averaging around 10 meters above sea level, contributes to a unique atmospheric profile. Rattaphum sits close to the Gulf of Thailand, a major body of water influencing local climate and air circulation patterns. The surrounding landscape is a blend of agricultural land – primarily rubber plantations and oil palm groves – interspersed with smaller villages and pockets of mangrove forests along the coastline. The urban–rural gradient is relatively gradual; agricultural activities are integrated into the broader landscape, rather than sharply demarcated. To the west, the terrain gradually increases in elevation, hinting at the foothills of the southern Thai mountain ranges. This proximity to agricultural zones means that seasonal burning practices, common in rubber and palm oil cultivation, can significantly impact local air quality. Furthermore, while Rattaphum itself is a relatively small city, it benefits from and is influenced by the larger industrial and commercial activity of Hat Yai, located approximately 30 kilometers to the northeast. This proximity introduces potential sources of industrial emissions that can be transported by prevailing winds.

Rattaphum’s tropical climate dictates a distinct wet and dry season, profoundly influencing its air quality. The dry season, typically spanning from February to April, often presents the most challenging conditions. Reduced rainfall and lower humidity contribute to a build-up of pollutants, exacerbated by the prevalence of temperature inversions. These inversions trap cooler air near the ground, preventing the vertical dispersion of emissions from agricultural burning and any localized industrial activity. The prevailing winds during this period are often light and variable, further hindering pollutant dispersal. March and April are particularly concerning months, with increased haze often observed. The wet season, from May to October, brings frequent rainfall and higher humidity, naturally cleansing the atmosphere and significantly reducing pollution levels. Monsoon winds, particularly during September and October, help to flush out accumulated pollutants. November to January represents a transitional period, with decreasing rainfall and gradually increasing temperatures. Fog, common during these cooler months, can also trap pollutants near the surface, 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 prolonged outdoor exposure and avoiding strenuous activity, especially on days with visible haze. Agricultural workers should be mindful of smoke exposure during burning periods, utilizing appropriate protective measures.