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San Sebastián de Mariquita, nestled in the heart of Colombia’s Tolima department, occupies a geographically complex position within the central Andean region. Situated at coordinates 5.2500, -74.9167, the city’s elevation of approximately 650 meters (2,133 feet) above sea level significantly influences its climate and, consequently, its air quality. Mariquita lies within the Magdalena River Valley, a crucial transportation corridor and agricultural zone. The surrounding terrain is characterised by steep, forested hills and mountains, creating a bowl-like topography that can trap pollutants. The Magdalena River itself, while a vital resource, contributes to humidity and potential for localised fog formation. The urban-rural gradient is relatively sharp; the city centre transitions quickly to coffee plantations and cattle ranches. While not a major industrial hub, Mariquita serves as a regional commercial centre, with associated vehicle traffic and small-scale manufacturing. Agricultural practices, including the use of fertilizers and potential burning of agricultural waste, contribute to particulate matter. The city’s location within a valley, combined with the prevailing wind patterns, can exacerbate pollution episodes, particularly during periods of low atmospheric mixing. Understanding this interplay of geography and activity is crucial for addressing air quality concerns in San Sebastián de Mariquita.

San Sebastián de Mariquita experiences a bimodal rainfall pattern, rather than distinct seasons, defining wet and dry periods. Air quality generally improves during the wetter months (April-May and October-November) as rainfall effectively washes particulate matter from the atmosphere. However, increased humidity can also contribute to the formation of mould spores, impacting respiratory health. The driest months (December-February and June-August) typically see a deterioration in air quality. During the drier periods, agricultural activities, such as land preparation and potential burning, increase particulate matter concentrations. Dust from unpaved roads also becomes more prevalent. Temperature inversions, common in the valley during the cooler nights of the dry season, trap pollutants near ground level. February and July are often the months with the poorest air quality. Sensitive groups – children, the elderly, and those with pre-existing respiratory conditions – should limit strenuous outdoor activity during these times. The Magdalena River’s influence is felt year-round, contributing to localised humidity and potential for fog, which can trap pollutants. Monitoring wind patterns is crucial; winds from the south can carry pollutants from agricultural areas into the city.