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Puerto Carreño, nestled in the easternmost department of Vichada, Colombia, occupies a unique geographic position within the Amazon rainforest basin. Situated at coordinates 6.1903, -67.4836, the city lies on the banks of the Orinoco River, a major waterway influencing local climate and transportation. The terrain is predominantly flat, characteristic of the Llanos Orientales (Eastern Plains), with an elevation of approximately 80 meters above sea level. Puerto Carreño serves as a crucial commercial hub connecting Colombia with Venezuela, experiencing significant cross-border trade. The surrounding landscape is dominated by savannas, rainforest, and extensive wetlands, creating a complex ecosystem. While not heavily industrialized, the city’s growth is linked to agricultural activities – primarily cattle ranching – and the increasing demands of the oil industry further south. The urban-rural gradient is sharp; the city itself is relatively small, quickly transitioning into vast, sparsely populated areas. This proximity to natural ecosystems, while beneficial for biodiversity, also means air quality is heavily influenced by regional factors like seasonal fires and wind-borne dust from the arid Guiana Shield. The Orinoco River, while a vital resource, can contribute to humidity and potentially trap pollutants during temperature inversions.

Puerto Carreño experiences a pronounced wet and dry season rather than traditional four seasons. The dry season, typically from December to April, is when air quality concerns peak. Reduced rainfall leads to increased dust suspension from the surrounding savannas and potential for wildfires, both contributing to particulate matter pollution. The Orinoco River’s lower water levels during this period can also exacerbate dust issues. January and February are generally the months with the poorest air quality. Conversely, the wet season, spanning May to November, brings significant rainfall that effectively washes away pollutants, resulting in cleaner air. However, high humidity can foster mold growth indoors, impacting respiratory health. August and September, the peak of the rainy season, offer the most favourable conditions for outdoor activities. Temperature inversions, common during the calmer nights of the dry season, can trap pollutants near ground level. Sensitive groups – children, the elderly, and those with respiratory conditions – should limit strenuous outdoor activity during the dry season and monitor their health closely. The prevailing winds, generally from the east, can transport smoke from distant fires into the city, necessitating vigilance even during the wet season.