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Convención, Norte de Santander, Colombia, occupies a strategically important location within the Andean foothills, nestled at an elevation of approximately 1,880 meters (6,168 feet) above sea level. The city’s geography is dominated by rolling hills and valleys, characteristic of the Eastern Andean region. It sits within a transitional zone between the high-altitude páramo ecosystems to the east and the more fertile agricultural lands of the Catatumbo River basin to the west. This river, a significant tributary of the Magdalena River, provides a crucial water source for the region and influences local microclimates. The surrounding landscape is a mosaic of small-scale agriculture, primarily focused on coffee, plantain, and maize cultivation, interspersed with patches of cloud forest and grazing land. Convención’s urban character is that of a relatively small, developing municipality, with a gradual urban–rural gradient extending outwards. The city’s position along the Pan-American Highway (Route 45) contributes to its regional connectivity but also introduces a source of vehicular emissions. The terrain, with its enclosed valleys, can exacerbate air pollution episodes, particularly when coupled with stable atmospheric conditions. The proximity to agricultural zones means that seasonal burning practices, common for land clearing and crop residue management, can significantly impact air quality, especially during drier periods. The prevailing winds, often channeled through the valleys, play a crucial role in dispersing or trapping pollutants, directly influencing the city's air quality profile.

Convención’s tropical savanna climate (Aw) dictates a distinct wet and dry season pattern, profoundly influencing its air quality. The dry season, typically spanning December to March, presents the greatest air quality challenges. Reduced rainfall leads to lower atmospheric moisture, promoting the formation of temperature inversions, particularly during the early morning hours. These inversions trap pollutants close to the ground, intensifying their concentration. Agricultural burning, a common practice during this period for land preparation, releases significant quantities of particulate matter and volatile organic compounds, further degrading air quality. The months of January and February often experience the most persistent and severe pollution episodes. Conversely, the wet season (April to November) brings relief through frequent rainfall, which effectively ‘washes’ pollutants from the atmosphere. Increased humidity also reduces the formation of inversions. However, periods of prolonged fog, common during the transition months (October/November), can temporarily reduce visibility and trap pollutants in localized areas. Wind patterns are generally variable, but during the dry season, weaker winds contribute to pollutant stagnation. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should exercise caution during the dry season, limiting outdoor activities during peak pollution hours (early morning and late afternoon). Maintaining indoor air quality through ventilation and air purification can also be beneficial. The increased humidity during the wet season can exacerbate mold growth, which can also impact respiratory health, so proper ventilation is still important.