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Rionegro, nestled in the department of Santander, Colombia, occupies a geographically significant position within the Andean foothills. Located at approximately 7.2642° latitude and -73.1494° longitude, the city sits at an elevation of around 1,920 meters (6,300 feet) above sea level, contributing to a cooler, more temperate climate than many lowland Colombian cities. The surrounding landscape is characterized by rolling hills, verdant pastures, and coffee plantations, a testament to the region's agricultural prominence. Rionegro is strategically positioned within the 'Coffee Triangle' (Eje Cafetero), a region renowned for its high-quality Arabica coffee production. This agricultural activity, while economically vital, introduces localized sources of particulate matter from soil disturbance and fertilizer use. The urban fabric of Rionegro is relatively compact, exhibiting a gradual urban-rural gradient as one moves outwards. While the city itself is primarily residential and commercial, the immediate periphery is dominated by agricultural lands and smaller rural settlements. The absence of major industrial belts within the immediate vicinity is a mitigating factor for air quality, though transportation-related emissions from vehicles traversing the mountainous terrain remain a consideration. The city's location within a valley can, at times, exacerbate air pollution episodes due to limited atmospheric dispersion, particularly during periods of stable weather conditions. The proximity to the Rio Cauca, though not directly adjacent, influences regional weather patterns and can impact humidity levels, which in turn affects pollutant behaviour.

Rionegro experiences a tropical rainforest climate with distinct wet and dry seasons, rather than the four traditional seasons. The dry season, typically spanning December to February, often sees a slight improvement in air quality due to increased sunshine and enhanced atmospheric mixing. However, this period can also be marked by agricultural burning practices in surrounding areas, contributing to localized spikes in particulate matter. The wet season, from March to November, brings frequent rainfall, which naturally helps to cleanse the atmosphere by removing pollutants. However, persistent fog, common during the wet season, can trap pollutants near ground level, creating periods of reduced visibility and potentially impacting air quality. Meteorological conditions play a crucial role; periods of calm winds and temperature inversions, more frequent during the transition months (October-November and February-March), can lead to pollutant accumulation. During these inversions, a layer of warm air traps cooler air near the ground, preventing vertical mixing and concentrating pollutants. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should exercise caution during these periods, limiting strenuous outdoor activity and monitoring for any adverse health effects. While the wet season generally offers respite, prolonged periods of rain can also lead to increased humidity, which can exacerbate respiratory issues for some. The agricultural cycle, with planting and harvesting activities, influences pollution levels throughout the year, with potential for increased dust and emissions during peak periods.