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Plaine du Nord, situated in the Nord department of Haiti at coordinates 19.6771, -72.2697, occupies a low-lying coastal plain, characteristic of its name – ‘Northern Plain’. With a population of approximately 28,544, the city’s geography is profoundly shaped by its proximity to the Atlantic Ocean. The terrain is generally flat, transitioning gradually inland towards the foothills of the Massif du Nord mountains. This flat topography, combined with prevailing trade winds, can contribute to localized air pollution build-up. The surrounding landscape is a mix of small-scale agriculture – primarily subsistence farming of crops like bananas, mangoes, and coffee – and increasingly, informal settlements. The urban-rural gradient is quite sharp; Plaine du Nord itself is a relatively concentrated urban centre, but quickly gives way to rural agricultural lands. While not a major industrial hub, the presence of small workshops and the burning of biomass for cooking and heating are significant emission sources. The coastal location means salt spray is a constant factor, potentially influencing particulate matter composition. The lack of significant natural barriers to air flow from the ocean also means pollutants can be transported relatively easily, impacting local air quality. The city’s position within a hurricane belt adds another layer of complexity, with storm surges and wind events capable of dispersing or concentrating pollutants.

Air quality in Plaine du Nord follows a pattern largely dictated by the wet and dry seasons. The dry season, typically spanning December to April, sees a noticeable increase in particulate matter. Reduced rainfall means less atmospheric cleansing, and increased reliance on burning wood and charcoal for cooking and heating exacerbates the problem. Dust from agricultural activities and unpaved roads also contributes. February and March are often the months with the poorest air quality. The wet season, from May to November, brings relief. Frequent rainfall washes pollutants from the atmosphere, and higher humidity can suppress dust. However, the wet season also brings the risk of flooding, which can mobilize pollutants from contaminated areas. August and September, peak hurricane season, can see temporary improvements due to heavy rainfall, but also potential for widespread dispersal of pollutants if infrastructure is damaged. Temperature inversions, though less common than in temperate climates, can occur during the calmer periods of the dry season, trapping pollutants near the ground. Sensitive groups – children, the elderly, and those with respiratory conditions – should limit outdoor activity during the dry season and be particularly cautious during periods of calm weather. Monitoring local conditions and staying indoors when visibility is reduced is advisable.