Thaton, nestled in Mon State, Myanmar (coordinates 16.9250° N, 97.3667° E), occupies a geographically significant position within a landscape shaped by the Bilauk Taung mountain range. The city’s terrain is gently undulating, transitioning from low-lying plains towards the foothills of these mountains, which influence local weather patterns and air circulation. Situated approximately 100km south of Mawlamyine, the state capital, Thaton serves as a crucial economic hub, particularly for the region’s rubber and palm oil industries. The surrounding landscape is predominantly rural, characterized by extensive rubber plantations and oil palm groves, interspersed with smaller agricultural plots cultivating rice and other crops. This urban-rural gradient is relatively sharp, with the city acting as a focal point for processing and trade within a largely agrarian hinterland. The Tenasserim River flows nearby, though its direct influence on Thaton’s immediate air quality is limited; however, it contributes to regional humidity. The Bilauk Taung range to the east creates a barrier, potentially trapping pollutants under certain meteorological conditions. Industrial activity, primarily centered around rubber processing and palm oil refining, is concentrated within and around the city, contributing to localized air pollution sources. The relatively flat topography surrounding Thaton, combined with the mountain barrier, can lead to stagnant air conditions, especially during periods of low wind speed, exacerbating the impact of these industrial emissions and agricultural practices.

Thaton’s tropical monsoon climate dictates a distinct seasonal pattern in air quality. The dry season, typically spanning from November to April, often sees a build-up of pollutants due to reduced rainfall and lower wind speeds. During these months, temperature inversions are more frequent, trapping emissions close to the ground, particularly from rubber processing facilities and agricultural burning. The lack of consistent rainfall means fewer opportunities for natural cleansing of the atmosphere. February and March often represent the most challenging periods for air quality, with increased particulate matter concentrations. The monsoon season, from May to October, brings relief through frequent rainfall and increased wind speeds, which disperse pollutants more effectively. However, the monsoon also introduces its own challenges. Heavy rainfall can lead to flooding, impacting infrastructure and potentially releasing pollutants from contaminated sites. Fog, common during the transitional periods between seasons, can also trap pollutants, creating localized pockets of poor air quality. During the wettest months (July and August), while overall pollution tends to be lower, agricultural burning, though regulated, can still occur, contributing to short-term spikes. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should exercise caution during the dry season, limiting outdoor activity during peak pollution periods and ensuring adequate ventilation indoors. The transitional months (April/May and October/November) require vigilance due to the potential for fog and variable wind conditions.