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Baie de Henne, nestled in the Nord-Ouest department of Haiti, occupies a geographically significant position along the Atlantic coast. Its name, translating to ‘Henne Bay,’ accurately describes its location within a broad, gently curving bay, providing a natural harbor and influencing local wind patterns. The city’s terrain is characterized by a gradual rise from the coastal plain, transitioning into rolling hills and low mountains inland. Elevation within Baie de Henne itself is relatively modest, rarely exceeding 50 meters above sea level, which can exacerbate the trapping of pollutants under certain meteorological conditions. The surrounding landscape is a mosaic of small-scale agriculture – primarily subsistence farming of maize, beans, and plantains – interspersed with patches of dry forest and scrubland. This agricultural activity, while vital for local livelihoods, contributes to particulate matter pollution, particularly during planting and harvesting seasons. The urban–rural gradient is relatively sharp; the city itself is compact, with a clear delineation between the built environment and the surrounding agricultural and natural areas. The proximity to the Atlantic Ocean introduces a maritime influence, moderating temperatures and occasionally bringing in sea spray, which can affect visibility and contribute to localized air quality issues. There are no major industrial belts immediately adjacent to Baie de Henne, but the region’s reliance on charcoal production for cooking and heating represents a significant source of air pollution, impacting air quality both locally and regionally. The bay’s geography, combined with the prevailing wind patterns, can create localized areas of stagnant air, particularly during periods of calm weather.

Baie de Henne experiences a tropical climate with distinct wet and dry seasons, profoundly influencing its air quality profile. The wet season, typically spanning from May to October, brings frequent rainfall and increased humidity. While 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 reduced wind. The dry season, from November to April, is characterized by lower rainfall and generally clearer skies, but also by a greater propensity for stagnant air conditions. During this period, the lack of rainfall means pollutants accumulate, and the lower humidity doesn't provide the same cleansing effect as rain. Temperature inversions, where a layer of warm air sits above cooler air near the ground, are more common during the dry season, further trapping pollutants. The burning of charcoal for cooking and heating, a prevalent practice in the region, intensifies during the cooler, drier months, contributing significantly to particulate matter pollution. Wind patterns, often influenced by the bay’s geography, can be variable. Periods of calm winds exacerbate pollution buildup, while stronger winds can disperse pollutants, though they can also carry them to neighboring communities. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should exercise caution during the dry season, particularly during periods of stagnant air. Outdoor activities are generally more favorable during the wetter months, although vigilance regarding potential flooding is also necessary. The transition periods between seasons often see fluctuating air quality, requiring adaptable health precautions.