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Caucasia, nestled in the northern department of Antioquia, Colombia, occupies a unique geographic position within a complex landscape. Situated at coordinates 7.9833, -75.2000, the city lies in a valley carved by the Cauca River, a major waterway that significantly influences local climate and air circulation. The terrain is characterised by rolling hills and the beginnings of the Andes foothills, creating a bowl-like effect that can trap pollutants. Elevation is approximately 220 meters above sea level. Surrounding Caucasia are extensive agricultural lands, primarily dedicated to banana, plantain, and livestock farming, alongside emerging oil extraction activities. This mix of agriculture and industry contributes to specific pollution sources. The urban-rural gradient is relatively sharp; the city centre quickly transitions to rural landscapes. The Cauca River, while vital for transport and irrigation, can also contribute to humidity and localised fog formation, impacting pollutant dispersion. The city’s location within a river valley, combined with agricultural practices and increasing industrial activity, creates a specific set of challenges for maintaining good air quality. Prevailing winds generally follow the river course, influencing the direction of pollutant transport. The surrounding mountains limit air mass exchange, potentially exacerbating pollution episodes.

Caucasia experiences a tropical climate with pronounced wet and dry seasons, rather than traditional four seasons. Air quality fluctuates significantly with these shifts. The drier months, typically December to March, see increased dust and particulate matter from agricultural activities and unpaved roads. Lower rainfall means less atmospheric cleansing, and temperature inversions are more frequent, trapping pollutants near the ground. This period often presents the poorest air quality. The wet season, from April to November, generally brings improved air quality due to rainfall washing away pollutants and increased humidity suppressing dust. However, increased cloud cover can also lead to stagnant air conditions. August and September, peak rainfall months, are usually the most favourable for outdoor activity. Oil extraction activities, prevalent year-round, contribute a consistent baseline of pollutants. Sensitive groups – children, the elderly, and those with respiratory conditions – should limit strenuous outdoor activity during the drier months and monitor their health closely. Periods of intense agricultural burning, often coinciding with land preparation for planting, can cause short-term spikes in pollution, regardless of the season. Local meteorological patterns, including the influence of the Intertropical Convergence Zone, play a crucial role in determining pollutant dispersion.