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Palmito, nestled within the Sucre Department of Colombia, occupies a geographically significant position within the Magdalena River Delta region. Located at approximately 9.3333° latitude and -75.5500° longitude, the town’s terrain is predominantly flat, characteristic of deltaic landscapes, with elevations rarely exceeding 30 meters above sea level. This low elevation contributes to a humid, tropical climate and influences local air circulation patterns. Palmito’s proximity to the Magdalena River, a vital waterway, shapes its urban character, with the river acting as both a transportation corridor and a source of livelihood for many residents. The surrounding landscape is a mosaic of agricultural lands – primarily rice and banana cultivation – interspersed with patches of tropical forest and wetlands. This agricultural activity, while economically important, can contribute to localized air pollution through the use of fertilizers and pesticides, and the burning of agricultural waste. The urban–rural gradient around Palmito is gradual, with small settlements and farms blending seamlessly into the town’s periphery. Further afield, the delta gradually transitions into more densely forested areas. The flat topography and prevailing wind patterns, often influenced by the river’s thermal dynamics, can lead to stagnant air conditions, particularly during periods of reduced wind speed, exacerbating the impact of local emissions. The lack of significant topographical barriers means pollutants can spread relatively easily across the region, impacting air quality beyond the immediate town limits. Industrial activity is limited, but the transport of agricultural goods via the river contributes to emissions.

Palmito’s tropical climate dictates a wet and dry season cycle, profoundly impacting its air quality. The wet season, typically spanning from April to November, brings frequent rainfall and increased humidity. While the rain naturally helps to cleanse the atmosphere by removing particulate matter, the increased humidity can trap pollutants closer to the ground, especially during periods of calm weather. The dry season, from December to March, often sees a build-up of pollutants due to reduced rainfall and increased solar radiation, which can lead to photochemical smog formation. During this period, stagnant air conditions are more common, particularly in the mornings when temperature inversions can trap emissions near the surface. The agricultural practices prevalent in the surrounding delta, such as burning crop residues after harvest, are most common during the dry season, significantly contributing to particulate matter pollution. Fog, a frequent occurrence during the cooler, drier months, further exacerbates the problem by trapping pollutants and reducing visibility. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should exercise caution during the dry season, particularly in the mornings. Outdoor activities are generally more favourable during the wet season, although heavy rainfall can still impact visibility and air quality. The Magdalena River’s influence on local weather patterns, including its thermal effects, plays a crucial role in determining the dispersion of pollutants throughout the year, creating localized variations in air quality across the region. Periods of intense heat during the dry season can also increase ozone levels.