Montrouis Air Quality Index (AQI)

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Montrouis, nestled within Haiti’s Ouest department at coordinates 18.9511, -72.7057, presents a unique geographic profile influencing its air quality. The city occupies a coastal plain, gently rising inland towards the foothills of the Trou Nord mountains. This terrain creates localized wind patterns, often channeling breezes from the Caribbean Sea, but also fostering potential for temperature inversions, trapping pollutants near ground level. Montrouis benefits from direct access to the sea, which can provide some dispersion of airborne particles, yet also introduces salt spray contributing to particulate matter. The surrounding landscape is a mosaic of small-scale agriculture – primarily subsistence farming of crops like mangoes, bananas, and coffee – and increasingly, informal settlements. While not a major industrial hub, Montrouis serves as a transport corridor, with road traffic contributing to localised emissions. The urban-rural gradient is relatively sharp; the city centre is densely populated, transitioning quickly to rural agricultural lands. Dust from unpaved roads and agricultural activities, combined with emissions from charcoal burning for cooking and small-scale businesses, are key factors impacting air quality. The proximity to Port-au-Prince, a major source of pollution, also means Montrouis can experience transboundary pollutant transport, particularly during periods of stable atmospheric conditions. The population of 18,419 is concentrated along the coastal route, exacerbating exposure in these areas.

Montrouis experiences a distinct wet and dry season, profoundly impacting air quality. The dry season, typically from December to April, sees significantly reduced rainfall and increased dust resuspension from agricultural lands and unpaved roads. This period often witnesses the poorest air quality, exacerbated by increased charcoal burning for cooking and heating as temperatures remain relatively mild. February and March are particularly challenging. Conversely, the wet season, spanning May to November, brings frequent rainfall that effectively washes away particulate matter, leading to improved air quality. However, the heavy rains can also contribute to increased humidity, fostering mold growth indoors, which can affect respiratory health. August and September, coinciding with the peak of the hurricane season, can bring periods of stagnant air and potential for pollutant build-up if storms disrupt typical wind patterns. Temperature inversions, common during the cooler nights of the dry season, trap pollutants close to the ground. 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. Maintaining good indoor ventilation is crucial year-round, but especially during periods of high humidity.