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Tauramena, nestled in the Casanare department of Colombia, occupies a geographically significant position within the Llanos Orientales, a vast tropical grassland plain. Located at approximately 5.0167° N, 72.7500° W, and an elevation of roughly 370 meters (1214 feet) above sea level, the city’s terrain is predominantly flat, characteristic of the Llanos. This flatness, while facilitating urban expansion, also contributes to air quality challenges. The surrounding landscape is dominated by expansive savannas, interspersed with gallery forests along the numerous rivers and streams that crisscross the region, including the Ariporo River nearby. Agriculture, particularly cattle ranching and the cultivation of crops like corn and beans, forms the backbone of the local economy, and these activities introduce localized sources of particulate matter and volatile organic compounds. Tauramena’s location within a relatively sparsely populated region means a gradual urban–rural gradient, with agricultural lands quickly giving way to the savanna. The lack of significant topographic barriers means that pollutants released within the city and surrounding areas tend to disperse horizontally rather than vertically, potentially leading to localized accumulation. While not directly adjacent to major industrial belts, the increasing mechanization of agriculture and the transportation of goods across the Llanos contribute to emissions. The climate, hot and humid year-round, with distinct wet and dry seasons, further influences atmospheric conditions and pollutant dispersion patterns. The flat terrain and prevailing wind patterns, often influenced by regional weather systems, play a crucial role in determining air quality dynamics.

Tauramena’s tropical climate dictates a seasonal narrative of air quality, primarily defined by wet and dry periods. The dry season, typically spanning from December to April, often witnesses a noticeable increase in particulate matter concentrations. This is largely attributable to increased agricultural activity – burning of vegetation for land clearing and controlled burns to manage pastures are common practices. Reduced rainfall during this period also limits the natural cleansing effect of precipitation, allowing pollutants to linger. Conversely, the wet season, from May to November, generally brings improved air quality due to frequent rainfall washing away particulate matter and increased humidity facilitating pollutant removal. However, periods of intense fog, common during the transition months (May and November), can trap pollutants near the ground, creating localized episodes of reduced visibility and potentially elevated concentrations of certain gases. Temperature inversions, though less frequent than in cooler climates, can occasionally occur, particularly during calmer periods within the dry season, preventing vertical mixing and leading to pollutant accumulation. The prevailing winds, often shifting with the broader regional weather patterns, influence the dispersal of emissions. For sensitive groups, such as children, the elderly, and individuals with respiratory conditions, the dry season months of January and February should be approached with caution, limiting prolonged outdoor exertion. During the wet season, while generally better, periods of dense fog warrant similar precautions. Maintaining awareness of local weather conditions and agricultural practices is key to mitigating potential exposure.