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Puerto Rico, nestled within the Meta department of Colombia, presents a unique geographic profile significantly influencing its air quality. Located at approximately 2.9383° latitude and -73.2083° longitude, this small municipality (population 11,433) sits within the Amazon rainforest biome, a region characterized by dense vegetation and high humidity. The surrounding landscape is dominated by the vast Amazon basin, a sprawling network of rivers, tributaries, and low-lying floodplains. Elevation is relatively low, generally below 200 meters above sea level, contributing to stable atmospheric conditions and potential for ground-level ozone formation. Puerto Rico’s proximity to the Guaviare River, a major Amazonian waterway, introduces a constant source of moisture and influences local weather patterns. While the municipality itself is primarily rural, it lies within a region experiencing increasing agricultural activity, particularly cattle ranching and soybean cultivation, which can contribute to particulate matter emissions and ammonia release. The urban–rural gradient is gradual, with small settlements interspersed throughout the rainforest. The region's position within the Amazon also means it's susceptible to transboundary pollution, with air masses carrying pollutants from distant industrial areas or deforestation hotspots. The dense forest canopy, while generally beneficial for air quality by absorbing pollutants, can also trap them under certain meteorological conditions, exacerbating localized pollution events. The flat terrain limits dispersion of pollutants, further impacting air quality.

Puerto Rico’s tropical climate dictates a wet and dry season cycle, profoundly impacting air quality throughout the year. The dry season, typically from December to April, often sees a slight increase in particulate matter concentrations. This is largely due to increased agricultural burning for land clearing and crop residue management, a common practice in the region. While rainfall is still present, it’s less frequent, allowing these emissions to linger. The wet season, from May to November, brings frequent and intense rainfall, which naturally cleanses the atmosphere, washing away particulate matter and reducing overall pollution levels. However, periods of prolonged cloud cover and reduced wind speeds during the wet season can lead to stagnant air and localized build-up of pollutants, particularly ozone. Fog, a relatively common occurrence during the transition months (April/May and October/November), can trap pollutants near the ground, creating temporary pockets of poor air quality. Temperature inversions, though less frequent than in temperate climates, can also occur, trapping cooler air and pollutants near the surface. During the dry season, sensitive groups like children, the elderly, and individuals with respiratory conditions should limit strenuous outdoor activities, especially during periods of agricultural burning. The wet season generally offers improved air quality, but vigilance is still advised during periods of fog or stagnant air. The Amazon’s vastness means that regional deforestation and fires, even far from Puerto Rico, can impact air quality through long-range transport of smoke and aerosols.