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Borgne, nestled in the Nord department of Haiti (coordinates 19.8451, -72.5235), occupies a geographically significant position within the country’s northern coastal plain. The city’s terrain is characterized by gently rolling hills transitioning to a low-lying coastal landscape, influenced by the proximity to the Atlantic Ocean. Borgne sits within a region dominated by agricultural activity, primarily sugarcane cultivation and small-scale farming, which contributes to the regional landscape and, potentially, localized air quality concerns. The surrounding landscape is a mosaic of cultivated fields, interspersed with patches of dry forest and scrubland, typical of Haiti’s northern region. Elevation is relatively low, rarely exceeding 100 meters above sea level, which can exacerbate the trapping of pollutants under certain meteorological conditions. The urban–rural gradient around Borgne is gradual, with smaller villages and agricultural settlements blending seamlessly into the city’s periphery. The city’s coastal location exposes it to maritime influences, including sea breezes that can disperse pollutants, but also introduces salt spray and potential for coastal fog. While Borgne lacks large-scale industrial zones within its immediate vicinity, it benefits from its position along major transportation routes, facilitating the movement of goods and people, which can indirectly impact air quality through vehicle emissions. The region's climate is tropical, with distinct wet and dry seasons, further shaping the local atmospheric conditions and influencing pollutant dispersion patterns.

Borgne’s tropical climate dictates a seasonal narrative of air quality, primarily defined by wet and dry periods rather than the four traditional seasons. The dry season, typically spanning from December to April, often witnesses a relative increase in particulate matter. Reduced rainfall means less atmospheric cleansing, and agricultural burning, a common practice for land preparation, contributes significantly to localized smoke and haze. Temperature inversions, where cooler air becomes trapped beneath warmer air, are more frequent during these months, hindering vertical mixing and concentrating pollutants near ground level. The months of January and February are particularly susceptible to this phenomenon, making outdoor activities for sensitive groups – children, the elderly, and those with respiratory conditions – potentially problematic. Conversely, the wet season, from May to November, brings frequent rainfall and increased humidity, naturally scrubbing the atmosphere and reducing particulate concentrations. Stronger winds associated with tropical weather systems also aid in pollutant dispersal. However, heavy rainfall can lead to increased levels of mold and allergens, impacting air quality for those with sensitivities. Fog, particularly during the transitional periods between wet and dry seasons, can also temporarily reduce visibility and trap pollutants. During the wet season, outdoor activities are generally more favorable, though vigilance regarding potential allergens remains important. The interplay of these meteorological factors creates a dynamic air quality profile throughout the year, emphasizing the importance of awareness and proactive health measures.