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Anse à Galets, nestled within the Ouest department of Haiti, occupies a crucial coastal position on the southern peninsula. The city’s geography is dramatically defined by the rugged terrain of the Massif de la Selle mountains rising sharply inland, creating a complex interplay between coastal plains and steep slopes. Situated at coordinates 18.8345, -72.8664, Anse à Galets benefits from direct access to the Caribbean Sea, influencing its climate and contributing to potential salt spray aerosol pollution. The urban character is a blend of densely populated residential areas concentrated near the port and more dispersed settlements extending into the foothills. Surrounding the city are pockets of small-scale agriculture, primarily subsistence farming, and limited industrial activity concentrated around the port facilities. This port is a major economic driver, handling goods destined for and originating from the interior, but also a source of particulate matter from ship traffic and cargo handling. The urban-rural gradient is steep; a short distance inland reveals a predominantly rural landscape. The valley location, while offering some protection, can also trap pollutants during periods of calm winds, exacerbating air quality issues. The prevailing winds, generally from the northeast, can carry pollutants from other areas of the peninsula, impacting local air quality.

Anse à Galets experiences a tropical climate with distinct wet and dry seasons, heavily influencing air quality. The dry season, typically from December to April, sees lower rainfall and increased dust resuspension from unpaved roads and agricultural lands, leading to elevated particulate matter concentrations. Harmattan winds, carrying Saharan dust, can further worsen conditions during this period, particularly in February and March. Outdoor activity should be moderated during these months, especially for those with respiratory sensitivities. The wet season, from May to November, brings relief through rainfall which washes away pollutants, but also increases humidity, fostering mold growth and potentially triggering allergic reactions. August and September, coinciding with the peak of the hurricane season, can experience periods of stagnant air and localized flooding, concentrating pollutants. Temperature inversions, common during the calmer nights of both seasons, trap pollutants near ground level. November often sees a transition period with fluctuating conditions. Sensitive groups – children, the elderly, and those with pre-existing respiratory conditions – should limit strenuous outdoor activity during peak pollution periods and monitor their health closely. Fog, particularly in the mornings, can also trap pollutants, reducing visibility and impacting air quality.