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Santa Catalina, nestled within the Bolívar Department of Colombia, occupies a geographically complex position at coordinates 10.6039, -75.2878. The city’s terrain is characterised by rolling hills and valleys, typical of the northern Andean foothills, with an elevation that contributes to unique atmospheric conditions. Situated inland, Santa Catalina isn’t directly influenced by coastal breezes, but benefits from a moderate climate due to its altitude. The surrounding landscape is predominantly agricultural, with coffee plantations and small-scale farming dominating the rural areas immediately bordering the urban centre. This agricultural activity, while vital to the local economy, introduces potential sources of particulate matter from land preparation and biomass burning. The urban-rural gradient is relatively sharp, transitioning quickly from denser residential areas to open farmland. The city’s position within a valley can exacerbate air pollution issues, as pollutants can become trapped during periods of atmospheric stability. While not a major industrial hub, regional transport routes pass nearby, contributing to vehicle emissions. Understanding this interplay between topography, land use, and regional connectivity is crucial for assessing Santa Catalina’s air quality challenges. The lack of significant water bodies nearby limits evaporative cooling, potentially increasing ozone formation during warmer periods.

Santa Catalina experiences a bimodal rainfall pattern, defining its ‘wet’ and ‘dry’ seasons rather than traditional four seasons. The drier periods, typically from December to February and again from July to August, coincide with increased agricultural activity – land clearing and crop residue burning – leading to elevated particulate matter concentrations. These months are generally less favourable for outdoor activity, particularly for individuals with respiratory conditions. The wet seasons, from March to June and September to November, bring frequent rainfall which effectively scrubs the atmosphere, improving air quality. However, increased humidity can also promote mould growth, impacting indoor air quality. Temperature inversions, common in the valley during the cooler nights of the dry season, trap pollutants near ground level, worsening conditions. Wind patterns are generally light and variable, offering limited dispersion. November and December often see a build-up of pollutants before the heavier rains arrive. Sensitive groups – children, the elderly, and those with pre-existing respiratory or cardiovascular illnesses – should limit strenuous outdoor exertion during the drier months and monitor their health closely. Fog, prevalent during the wetter periods, can also contribute to localised air quality issues by trapping pollutants.