Terrier Rouge Air Quality Index (AQI)

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Terrier Rouge, nestled in the Nord-Est department of Haiti (coordinates 19.6363, -71.9548), occupies a geographically significant position within a landscape shaped by the Cordillera Central mountain range. The city’s elevation, while not exceptionally high, provides a degree of relief from coastal humidity, but also creates localized microclimates. Terrier Rouge sits within a transitional zone, bordering both agricultural plains and steeper, forested slopes. The surrounding terrain is characterized by a mix of cultivated land – primarily sugarcane and maize – and patches of dry tropical forest, contributing to both potential sources and sinks for air pollutants. The urban footprint is relatively compact, reflecting Terrier Rouge’s size (population 21,328), with a discernible urban–rural gradient extending outwards into the agricultural fields. While not directly adjacent to a major river, the city benefits from proximity to smaller streams and seasonal watercourses, influencing local humidity and potentially affecting the dispersion of airborne particles. The regional position, within a predominantly agricultural area, means that agricultural burning, a common practice for land clearing and residue disposal, represents a significant potential source of particulate matter. Furthermore, the lack of extensive industrial development within Terrier Rouge itself means that regional industrial belts, if any, are likely distant, though transportation corridors carrying goods to and from larger urban centers could contribute to localized pollution events. The prevailing winds, influenced by the mountainous terrain, play a crucial role in determining the city’s air quality, often channeling pollutants from surrounding areas.

Terrier Rouge’s tropical climate dictates a wet and dry season cycle, profoundly impacting air quality. The dry season, typically spanning from December to April, often witnesses a build-up of pollutants due to reduced rainfall and decreased atmospheric cleansing. Agricultural burning, intensified during this period to prepare fields for the next planting cycle, releases substantial quantities of particulate matter and volatile organic compounds. Temperature inversions, common during the cooler, drier nights, trap pollutants near the ground, exacerbating the problem. The months of January and February are particularly concerning, with stagnant air conditions frequently leading to elevated levels of airborne particles. Conversely, the wet season (May to November) brings relief through frequent rainfall, which effectively washes pollutants from the atmosphere. However, heavy downpours can also stir up dust and soil, temporarily increasing particulate concentrations. The intensity of the monsoon-like rains varies year to year, influencing the duration and severity of any temporary dust events. Fog, while less frequent than rain, can also contribute to localized air quality degradation by trapping pollutants. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should exercise caution during the dry season, limiting outdoor activity during peak burning periods and days with stagnant air. Maintaining indoor air quality through ventilation and air filtration can also provide some protection. The transition months of May and November present a more variable air quality profile, requiring vigilance and awareness of local conditions.