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Belén de los Andaquíes, nestled within the Amazon rainforest of Caquetá, Colombia, occupies a unique and challenging geographic position. Located at approximately 1.4161° latitude and -75.8725° longitude, the town sits at an elevation of roughly 380 meters (1247 feet) above sea level, placing it within a transitional zone between the Andean foothills and the vast Amazonian lowlands. The surrounding landscape is dominated by dense, primary rainforest, characterized by high biodiversity and significant rainfall. The Andaquíes River, a major tributary of the Amazon, flows directly through the town, influencing local microclimates and providing a vital transportation route. Belén’s urban character is relatively small and dispersed, reflecting its historical role as a river port and trading post for rubber and timber. The urban–rural gradient is exceptionally sharp; the town quickly merges into the surrounding rainforest, with agricultural activities, primarily small-scale farming and cattle ranching, occurring just beyond the town limits. There are no significant industrial belts nearby, although logging and limited processing of agricultural products contribute to localized emissions. The terrain is undulating, with hills and valleys impacting air circulation patterns. The dense vegetation surrounding Belén acts as both a carbon sink and a potential source of biomass burning during drier periods, significantly influencing local air quality. The Amazon's vastness moderates regional temperature extremes, but humidity remains consistently high, affecting pollutant dispersion.

Belén de los Andaquíes experiences a tropical rainforest climate, characterized by distinct wet and dry seasons rather than the four traditional seasons. The wet season, typically spanning from April to November, brings consistently high rainfall and humidity. During this period, air quality tends to be relatively stable, with frequent rainfall washing away particulate matter and high humidity limiting the formation of photochemical smog. However, persistent cloud cover can trap pollutants closer to the ground, particularly during periods of stagnant air. The dry season, from December to March, presents a different scenario. Reduced rainfall and increased solar radiation lead to drier conditions, increasing the risk of biomass burning from agricultural activities and land clearing. This burning, often involving less efficient methods, releases significant amounts of particulate matter and gases into the atmosphere. Temperature inversions, though less frequent than in cooler climates, can occasionally occur during the dry season, trapping pollutants near the surface. Fog, common during the early morning hours, can also exacerbate air quality issues by reducing dispersion. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should exercise caution during the dry season, particularly when biomass burning is prevalent. Outdoor activities are generally more favorable during the wet season, although heavy rainfall can still impact visibility and comfort. The consistent humidity throughout the year can also affect respiratory health, making it crucial to stay hydrated and avoid prolonged exposure to stagnant air.