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Bonao, nestled within the Cibao Sur region of the Dominican Republic at coordinates 18.9500, -70.4100, occupies a geographically complex position. The city sits in a valley, surrounded by the Cordillera Central mountain range, creating a basin-like topography. This terrain significantly influences air quality, as pollutants can become trapped during periods of atmospheric stability. Bonao’s elevation, approximately 165 meters above sea level, contributes to cooler temperatures than coastal areas, but also increases the potential for temperature inversions, exacerbating pollution build-up. The Yuna River flows nearby, providing a vital water source but also potentially contributing to humidity and localised fog formation, which can trap pollutants. The surrounding landscape is a mix of agricultural land – primarily focused on tobacco, coffee, and cacao – and increasingly, small-scale industrial activity related to processing these crops. An urban-rural gradient is clearly visible, with denser development concentrated in the city centre and more dispersed settlements extending into the agricultural periphery. The proximity to agricultural zones introduces potential sources of particulate matter from field burning and pesticide application, while industrial processes contribute to emissions of sulfur dioxide and nitrogen oxides. The valley’s shape limits natural ventilation, making Bonao particularly vulnerable to air quality issues.

Bonao 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 increased rainfall which effectively washes particulate matter from the atmosphere. However, high humidity can also contribute to the formation of mould spores, impacting respiratory health. The driest months, December to April, consistently present the poorest air quality. This is driven by increased dust from agricultural activities, particularly tobacco harvesting and processing, and a greater reliance on fossil fuels for energy. Temperature inversions are more frequent during the dry season, trapping pollutants near ground level. February and March are typically the most challenging months for those with respiratory sensitivities. Stronger winds associated with occasional cold fronts can provide temporary relief, but these are infrequent. Sensitive groups – children, the elderly, and individuals with asthma or other respiratory conditions – should limit strenuous outdoor activity during the dry season, particularly in the late afternoon when pollutant concentrations tend to peak. Monitoring local weather patterns and avoiding areas near agricultural burning are crucial preventative measures. The wet season offers a window for improved outdoor air quality, but vigilance regarding mould and humidity remains important.