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Arjona, Bolívar, Colombia, nestled within the Magdalena River Delta, presents a unique geographic profile significantly influencing its air quality. Located at approximately 10.2586° latitude and -75.3461° longitude, the city sits at a relatively low elevation, averaging around 15 meters above sea level. This proximity to the Magdalena River, a vital artery for Colombia, introduces a humid, tropical climate and a constant source of moisture, which can both trap and disperse pollutants. The surrounding landscape is characterized by a gradual transition from fluvial wetlands and mangrove forests to agricultural lands, primarily dedicated to rice and banana cultivation. This agricultural activity, while economically important, contributes to localized emissions from fertilizer use and machinery. Arjona’s position within the Bolívar Department places it within a region experiencing increasing urbanization and industrial development, particularly along the river corridor. The urban–rural gradient is relatively sharp, with the city acting as a commercial hub for the surrounding agricultural communities. The deltaic terrain, with its flat expanses and intricate network of waterways, limits natural ventilation, potentially exacerbating the effects of stagnant air conditions. Prevailing winds, often influenced by the river’s flow and coastal breezes, play a crucial role in pollutant dispersion, though their effectiveness is often hampered by the region’s topography and the presence of atmospheric humidity. The city’s location within a broad, low-lying plain means it is susceptible to flooding, which can resuspend particulate matter and further degrade air quality.

Arjona’s tropical climate dictates a wet and dry season pattern, profoundly impacting its air quality dynamics. The wet season, typically spanning from April to November, brings consistent rainfall and high humidity. While the rain itself can cleanse the atmosphere by removing particulate matter, the increased humidity often leads to the formation of fog, particularly during the early morning hours. This fog traps pollutants close to the ground, creating periods of reduced visibility and potentially elevated concentrations of certain gases. The dry season, from December to March, is characterized by lower rainfall and reduced humidity. During this period, the lack of precipitation allows pollutants to accumulate, and temperature inversions – where a layer of warm air sits above cooler air – can occur, further preventing vertical mixing and trapping pollutants near the surface. The agricultural activities intensify during the dry season, leading to increased emissions from machinery and fertilizer application. The months of February and March often experience the most stagnant air conditions, making it advisable for sensitive individuals, such as children, the elderly, and those with respiratory conditions, to limit prolonged outdoor exposure. Conversely, the periods immediately following rainfall, particularly during the wet season, generally offer improved air quality. Maintaining awareness of local weather patterns and limiting strenuous outdoor activities during periods of fog or temperature inversions is crucial for protecting respiratory health. The prevalence of dust from agricultural fields also contributes to air quality fluctuations throughout the year.