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Terre Neuve, nestled within the Artibonite Valley in Haiti (19.6000° N, 72.7833° W), occupies a geographically significant position within the island nation. The Artibonite River, Haiti’s longest, flows nearby, influencing local humidity and microclimates. The city’s terrain is predominantly flat, characteristic of the fertile valley floor, with gentle slopes rising towards the surrounding hills. This flat topography, while beneficial for agriculture, can exacerbate air pollution issues as it limits natural dispersion of pollutants. The surrounding landscape is overwhelmingly agricultural, dominated by sugarcane fields and smaller farms cultivating fruits and vegetables – a vital economic driver for the region. This proximity to agricultural zones introduces potential sources of particulate matter, particularly during harvest seasons when burning of crop residues can occur. The urban–rural gradient around Terre Neuve is relatively sharp; the city transitions quickly into agricultural land, with scattered rural settlements. There's limited evidence of significant industrial belts directly adjacent to Terre Neuve, though the Artibonite department as a whole experiences some light industrial activity further downstream. The elevation is low, generally below 50 meters above sea level, contributing to a warmer, more humid climate and potentially trapping pollutants closer to the ground. The valley's enclosed nature, bordered by higher ground, can restrict airflow, further impacting air quality and creating conditions conducive to stagnant air masses.

Terre Neuve’s tropical climate dictates a wet and dry season pattern, significantly influencing air quality dynamics. The wet season, typically spanning from April to October, brings frequent rainfall which naturally helps to cleanse the atmosphere, reducing particulate matter and gaseous pollutants. However, heavy downpours can also lead to increased humidity, potentially exacerbating respiratory issues for sensitive individuals. The dry season, from November to March, presents a greater air quality challenge. Reduced rainfall means less natural cleansing, and the lower humidity can allow dust and particulate matter from agricultural activities to linger. Wind patterns during this period are often weaker, leading to stagnant air conditions, particularly during periods of high pressure. Temperature inversions, where cooler air is trapped beneath warmer air, can also occur, further hindering pollutant dispersal. Months like January and February often experience the most persistent issues, with agricultural burning practices potentially contributing to elevated levels of smoke and particulate matter. Sensitive groups, including children, the elderly, and those with pre-existing respiratory conditions, should exercise caution during the dry season, limiting outdoor exertion during peak daylight hours and monitoring for any respiratory discomfort. The increased humidity during the wet season can trigger mold growth, which can also impact indoor air quality and exacerbate allergies. Overall, while rainfall offers some respite, the dry season poses the most significant air quality concerns for Terre Neuve’s residents.