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Restrepo, Meta, Colombia, nestled within the Amazonian piedmont, occupies a geographically significant position at approximately 4.25° N, 73.57° W. The city’s terrain is characterized by gently undulating plains transitioning into the foothills of the Andes, resulting in an elevation of around 350 meters above sea level. This location places Restrepo at the edge of a crucial urban–rural gradient, where agricultural lands, primarily dedicated to cattle ranching and the cultivation of crops like corn and beans, meet a developing urban center. The surrounding landscape is dominated by extensive grasslands, interspersed with patches of tropical rainforest, a remnant of the broader Amazon biome. While not directly adjacent to a major river, Restrepo benefits from numerous smaller tributaries and streams flowing from the Andes, contributing to the region’s overall humidity. The city’s proximity to the Llanos Orientales, a vast savanna ecosystem, influences regional wind patterns and contributes to the dispersal of pollutants. Industrial activity in the broader Meta department is primarily centered around cattle processing and agricultural product handling, with some limited timber extraction. The relatively flat topography, combined with the prevailing wind patterns influenced by the Andes and the Llanos, can lead to localized air stagnation, particularly during periods of reduced wind speed. This, coupled with agricultural practices and occasional burning for land clearing, can impact local air quality. The urban character of Restrepo is still developing, with a mix of traditional housing and newer constructions, reflecting its growth as a regional service center.

Restrepo’s tropical climate dictates a distinct wet and dry season pattern, significantly influencing its air quality profile. The dry season, typically spanning from December to April, often sees a build-up of particulate matter. Reduced rainfall means less atmospheric cleansing, and the prevalence of drier conditions encourages agricultural burning for land preparation, releasing significant quantities of smoke and ash into the air. Temperature inversions, common during the cooler nights of the dry season, trap pollutants close to the ground, exacerbating the issue. The wet season, from May to November, brings frequent rainfall and increased humidity, naturally washing away particulate matter and generally improving air quality. However, periods of intense rainfall can also lead to increased mold and fungal spore concentrations, impacting respiratory health for sensitive individuals. Wind patterns are generally consistent throughout the year, but can fluctuate, with periods of calm during the dry season leading to pollutant accumulation. During the wet season, increased cloud cover can reduce solar radiation, potentially affecting photochemical smog formation, though this is less of a concern than particulate pollution. For those with respiratory conditions like asthma or COPD, the dry season months of January, February, and March should be approached with caution, limiting strenuous outdoor activity and ensuring access to appropriate medication. Children and the elderly are particularly vulnerable during these periods and should take extra precautions to minimize exposure to potential pollutants.