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Anapoima, nestled in the department of Cundinamarca, Colombia, occupies a strategically important position within the Andean foothills, approximately 50 kilometers southeast of Bogotá. Its coordinates (4.5503, -74.5361) place it at an elevation of roughly 2,100 meters (6,889 feet) above sea level, contributing to a cooler climate compared to lower-lying regions. The surrounding landscape is dominated by rolling hills, steep slopes, and patches of cloud forest, characteristic of the Eastern Cordillera. This terrain significantly influences local air circulation patterns; valleys can trap pollutants, while higher elevations experience greater dispersion. Anapoima’s proximity to Bogotá, a major industrial and transportation hub, means it’s susceptible to transboundary pollution, particularly from vehicle emissions and industrial activity. While not directly bordering a major river, the area receives runoff from the surrounding mountains, impacting water quality which, in turn, can influence atmospheric particulate matter. The urban–rural gradient is relatively sharp; Anapoima itself is a small town, transitioning quickly into agricultural lands and forested areas. The dominant agricultural activities include coffee cultivation and livestock farming, which can contribute to localized air pollution through the use of fertilizers, pesticides, and animal waste. The town’s location within a densely populated region of Colombia means that regional air quality trends, driven by broader economic and industrial developments, have a direct impact on Anapoima’s air quality.

Anapoima’s tropical highland climate dictates a distinct wet and dry season pattern, profoundly impacting air quality throughout the year. The dry season, typically spanning December to February, often sees a slight improvement in air quality due to increased solar radiation and stronger winds, which help disperse pollutants. However, this period can also experience periods of stagnant air, particularly when high-pressure systems dominate, leading to localized pollution build-up. The wet season, from March to November, brings frequent rainfall and increased humidity. While rain naturally helps to cleanse the atmosphere by removing particulate matter, the increased humidity can exacerbate respiratory issues for sensitive individuals. Fog, common during the wet season, traps pollutants close to the ground, creating conditions for poor air quality. Agricultural burning, a common practice in the surrounding rural areas to clear land for planting, significantly contributes to particulate matter pollution during the transition periods between seasons, particularly in March and September. Temperature inversions, where cooler air is trapped beneath a layer of warmer air, are also more frequent during the dry season, preventing vertical mixing and concentrating pollutants. Individuals with respiratory conditions, such as asthma, and the elderly should exercise caution during periods of agricultural burning and when fog is prevalent, limiting outdoor activity and ensuring adequate ventilation indoors. During the wetter months, maintaining indoor air quality through proper ventilation and air purification can be beneficial.