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Buôn Trấp, the provincial capital of Đắk Lắk province in Vietnam’s Central Highlands, occupies a geographically significant position within a region characterized by undulating terrain and a predominantly rural landscape. Situated at approximately 12.48° N, 108.02° E and an elevation of around 600 meters above sea level, the city benefits from a relatively cool climate compared to Vietnam’s coastal regions. The surrounding landscape is dominated by sprawling coffee plantations, rubber farms, and dense evergreen forests, a legacy of the region’s historical importance in agricultural production. This agricultural intensity, while economically vital, contributes to localized air quality challenges. The city itself exhibits a gradual urban–rural gradient, with denser urban cores transitioning into more dispersed residential areas and agricultural zones. While Buôn Trấp lacks immediate proximity to major rivers or lakes, the presence of smaller streams and seasonal waterways influences local humidity and microclimates. Industrial activity is concentrated in specific zones, primarily focused on coffee processing, rubber manufacturing, and timber industries, creating localized pollution hotspots. The topography, with its hills and valleys, can trap pollutants, particularly during periods of low wind speed. The Central Highlands’ position inland also means it’s less influenced by coastal breezes, potentially exacerbating air quality issues. The region's geology, with volcanic soils, can also influence the dispersion of particulate matter.

Buôn Trấp’s tropical monsoon climate dictates a distinct seasonal pattern in air quality. The dry season, typically spanning from November to April, often sees a noticeable increase in particulate matter concentrations. This is largely attributable to agricultural burning practices – farmers clearing land for planting and harvesting – which release significant amounts of smoke and ash into the atmosphere. Reduced rainfall during this period means less natural cleansing of the air. Temperature inversions, common during the cooler nights of the dry season, trap pollutants close to the ground, further worsening conditions. The wet season, from May to October, brings increased rainfall and higher humidity, naturally flushing pollutants from the air and generally improving air quality. However, periods of prolonged fog, particularly in the early mornings, can temporarily reduce visibility and trap pollutants. The monsoon winds, while beneficial in dispersing pollutants overall, can occasionally carry dust and smoke from regional agricultural activities. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should exercise caution during the dry season, particularly in the months of January and February when agricultural burning is most prevalent. Limiting outdoor exertion during foggy mornings is also advisable. While the wet season generally offers respite, heavy rainfall can occasionally lead to increased levels of mold and allergens, impacting indoor air quality.