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Río San Juan, nestled within the Cibao Nordeste region of the Dominican Republic at coordinates 19.6400, -70.0800, is a municipality characterized by a transitional landscape between the fertile plains of the Cibao Valley and the foothills of the Cordillera Septentrional mountains. The city’s elevation, relatively low-lying, contributes to a humid subtropical climate. Its position approximately 15 kilometers inland from the Atlantic Ocean influences local weather patterns, bringing moisture and potential for coastal breezes, though these are often disrupted by the terrain. The surrounding area is predominantly agricultural, with significant sugarcane and cacao cultivation, alongside smaller-scale fruit and vegetable farming. This agricultural activity, while economically vital, introduces potential sources of particulate matter from field preparation, harvesting, and the use of agricultural chemicals. Río San Juan’s urban character is that of a provincial town, with a clear urban-rural gradient as one moves away from the central municipality. Limited heavy industry exists within the city itself, but regional transport routes pass through, contributing to vehicular emissions. The terrain funnels air movement, potentially exacerbating pollutant concentrations during periods of calm weather. The proximity to the ocean also means potential for salt spray and marine aerosols to influence air composition.

Río San Juan experiences a distinct wet and dry season, rather than traditional four seasons. Air quality generally improves during the wet season (May to November) due to rainfall effectively scavenging particulate matter from the atmosphere. However, increased humidity can also foster mold growth, impacting indoor air quality. The driest months, February to April, typically see the poorest air quality. This is due to increased dust from agricultural activities, drier conditions promoting wildfires (though less frequent than in other parts of the DR), and a greater concentration of pollutants from vehicle exhaust as people travel more. Temperature inversions, common during the calmer dry season mornings, trap pollutants near ground level. November and December offer a transitional period with improving conditions. Sensitive groups – children, the elderly, and those with respiratory conditions – should limit strenuous outdoor activity during the peak dry season. The prevailing easterly trade winds offer some relief, but localized wind patterns can create pockets of stagnation. Fog, particularly in the early mornings, can exacerbate respiratory issues by trapping pollutants. Monitoring wind direction and avoiding peak traffic hours are advisable.