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Chapelle, nestled in the Artibonite Valley of Haiti (19.4167° N, 72.5500° W), occupies a geographically significant position within the nation’s fertile heartland. The city’s terrain is predominantly flat, characteristic of the Artibonite River basin, with gentle slopes rising towards the surrounding hills. This low elevation (approximately 20 meters above sea level) contributes to a tendency for stagnant air conditions, particularly during periods of reduced wind. The Artibonite River, a vital waterway, flows nearby, influencing local humidity and potentially impacting the dispersion of pollutants. Chapelle’s location within a major agricultural zone means that agricultural practices, including burning of crop residues after harvest, are a significant factor in local air quality. The surrounding landscape is dominated by sugarcane fields and other cultivated lands, creating a distinct urban–rural gradient. While Chapelle itself is a relatively small town, it serves as a regional market center, attracting people and goods from surrounding rural communities. This concentration of activity can lead to localized pollution hotspots, particularly around transportation routes and market areas. The lack of significant industrial belts directly adjacent to Chapelle mitigates some industrial pollution risks, but the reliance on charcoal for cooking and heating in many households, coupled with vehicle emissions, remains a key concern. The valley’s enclosed nature, bordered by higher ground, can further impede air circulation and trap pollutants.

Haiti’s tropical climate dictates a wet and dry season pattern, profoundly influencing air quality in Chapelle. The dry season, typically spanning December to April, often brings clearer skies but also heightened particulate matter concentrations. Reduced rainfall means less atmospheric cleansing, and the persistent use of charcoal for cooking and heating becomes more prevalent as temperatures cool slightly, leading to increased smoke emissions. Wind patterns during this period can be variable; periods of calm can result in pollutant accumulation, while stronger winds can temporarily disperse them. The wet season, from May to November, generally sees improved air quality due to frequent rainfall washing pollutants from the atmosphere. However, heavy downpours can also stir up dust and soil, temporarily increasing particulate levels. The Artibonite River’s water level fluctuates seasonally, and periods of low water can exacerbate dust issues. Fog, particularly in the early morning during the transition months (April/May and October/November), can trap pollutants close to the ground, creating localized episodes of poor air quality. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should exercise caution during the dry season, particularly on days with stagnant air. Outdoor activities are generally more favorable during the wet season, although vigilance regarding dust stirred up by heavy rains is still advised. The combination of agricultural practices and household fuel use creates a complex interplay of factors affecting air quality throughout the year, demanding ongoing monitoring and mitigation strategies.