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Petit-Goâve, nestled in the Ouest department of Haiti, presents a complex geographical setting influencing its air quality. Situated at coordinates 18.4314, -72.8669, the city occupies a coastal plain bordering the Caribbean Sea. The terrain immediately surrounding Petit-Goâve is a mix of low-lying areas and gently rising hills, transitioning into the more substantial mountains of the Chaîne des Matheux further inland. This proximity to the sea introduces significant moisture and salt spray into the air, while the hills can contribute to localized wind patterns and potential temperature inversions. The urban character is largely defined by a concentrated settlement along the coast, with a gradual urban-to-rural gradient as one moves inland towards agricultural lands. These agricultural zones, primarily small-scale farming, contribute to particulate matter through land clearing and seasonal burning. While Petit-Goâve isn’t a major industrial hub, informal economic activities, including charcoal production – a significant energy source in Haiti – are prevalent, releasing substantial smoke and pollutants. The city’s location within a tropical climate means consistent high humidity and limited natural ventilation, exacerbating pollutant concentration. The lack of robust infrastructure for waste management further compounds the issue, leading to open burning of refuse and contributing to localized air pollution hotspots.

Petit-Goâve experiences a distinct wet and dry season, profoundly impacting air quality. The dry season, typically spanning December to April, sees a significant increase in particulate matter. Reduced rainfall means less atmospheric cleansing, and increased reliance on charcoal for cooking and heating amplifies smoke pollution. Harmattan winds, carrying dust from the Sahara Desert, can also contribute to elevated PM10 levels during this period. February and March are generally the months with the poorest air quality. Conversely, the wet season, from May to November, brings relief. Frequent rainfall effectively washes pollutants from the atmosphere, leading to improved air quality. However, increased humidity can also foster mold growth, potentially triggering respiratory issues. September and October, coinciding with the peak of the rainy season, generally offer the most favourable conditions for outdoor activity. Temperature inversions, though less frequent than in temperate climates, can occur during calmer periods, trapping pollutants near ground level. Sensitive groups – children, the elderly, and those with pre-existing respiratory conditions – should limit strenuous outdoor activity during the dry season and monitor their health closely. The consistent tropical heat also contributes to the formation of ground-level ozone, particularly on sunny days.