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Det Udom, nestled within the Ubon Ratchathani province of northeastern Thailand (Isan), occupies a geographically significant position within the broader Khorat Plateau. Located at approximately 14.9060° N, 105.0784° E, the city’s elevation averages around 140 meters (460 feet) above sea level, contributing to a relatively flat terrain characteristic of the plateau. The surrounding landscape is predominantly agricultural, a mosaic of rice paddies, maize fields, and fruit orchards, reflecting Isan’s reliance on farming. The Lam Dom Noi River flows nearby, providing a crucial water source for irrigation and local communities, though its influence on air quality is generally limited due to its size and flow patterns. Det Udom’s regional position, far from major industrial hubs like Bangkok, initially suggests lower pollution levels. However, agricultural burning, a common practice during the dry season to clear land for planting, significantly impacts local air quality. The urban–rural gradient is gradual; the city itself is a small administrative center with limited heavy industry, but the immediate periphery is intensely agricultural. This proximity to agricultural zones means that seasonal burning practices are a primary driver of particulate matter pollution. The plateau’s topography, while generally flat, can occasionally trap pollutants, particularly during periods of low wind speed and temperature inversions, exacerbating localized air quality issues. The climate is tropical savanna, with distinct wet and dry seasons, further influencing pollution dispersal patterns.

Det Udom’s air quality follows a distinct seasonal pattern dictated by its tropical savanna climate. The dry season, typically spanning from November to April, presents the most significant air quality challenges. Farmers routinely conduct land-clearing burns to prepare fields for the planting season, releasing substantial amounts of particulate matter and other pollutants into the atmosphere. This practice, while traditional, leads to periods of visibly hazy conditions and elevated air quality concerns. Meteorological conditions during this period often exacerbate the problem; lower wind speeds and the occasional occurrence of temperature inversions trap pollutants near the ground, preventing their dispersal. The months of January and February are frequently the most problematic. Conversely, the wet season (May to October) brings relief. Monsoon rains effectively wash pollutants from the air, significantly improving air quality. Increased rainfall and higher humidity also reduce the likelihood of agricultural burning. However, periods of heavy fog, particularly during the transition months (May and October), can temporarily reduce visibility and trap moisture-laden pollutants. 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 considering the use of face masks. While the wet season generally offers cleaner air, those with allergies should be mindful of pollen levels during the transition periods. Maintaining awareness of local weather patterns and agricultural practices is key to managing potential air quality impacts.