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Jimaní, nestled within the Enriquillo province of the Dominican Republic, occupies a geographically significant position bordering Haiti. Located at approximately 18.48° N, 71.85° W, the city’s terrain is characterized by a relatively flat alluvial plain, a direct consequence of its proximity to the vast Laguna de Rincón, the largest lake in the Dominican Republic. This lake, and the smaller Laguna Saladón nearby, exert a considerable influence on the local climate and, consequently, air quality. Jimaní’s elevation is low, averaging around 20 meters above sea level, which limits atmospheric dispersion of pollutants. The surrounding landscape is a mix of agricultural land – primarily sugarcane and other crops – and arid scrubland, typical of the southwestern Dominican Republic. The urban–rural gradient is relatively sharp; Jimaní itself is a small, primarily agricultural service center, transitioning quickly to rural farming communities. While Jimaní isn't a major industrial hub, the nearby Haitian border facilitates some cross-border trade and informal industries, potentially contributing localized pollution sources. The prevailing winds, often influenced by the lake’s thermal dynamics, can trap pollutants, particularly during periods of calm weather. The region's semi-arid climate, with limited rainfall, further restricts natural cleansing processes, impacting the overall air quality profile. The flat topography and limited vertical mixing contribute to a tendency for pollutants to accumulate near the ground, especially during stable atmospheric conditions.

Jimaní’s tropical climate dictates a wet and dry season pattern, significantly influencing its air quality. The dry season, typically spanning from December to April, often presents the most challenging conditions. Reduced rainfall means fewer opportunities for particulate matter washout, and the persistent sunshine can exacerbate photochemical smog formation, particularly if agricultural burning practices are prevalent. Temperature inversions, common during the cooler nights of the dry season, trap pollutants close to the ground, intensifying localized air quality concerns. The wet season, from May to November, brings increased rainfall, which naturally helps to cleanse the atmosphere by removing particulate matter. However, heavy rainfall can also lead to increased humidity, potentially affecting respiratory health for sensitive individuals. Wind patterns shift during the wet season, often bringing moisture-laden breezes from the Caribbean Sea, which can temporarily dilute pollutants. Agricultural activities, including harvesting and land preparation, are most intense during the transition periods between seasons, potentially leading to short-term spikes in smoke and dust. Months like March and April, as the dry season reaches its peak, are generally periods to exercise caution for those with respiratory sensitivities. Conversely, the months of June and July, during the early part of the wet season, often offer improved air quality. Sensitive groups, including children, the elderly, and individuals with pre-existing respiratory conditions, should be particularly mindful of air quality alerts and limit outdoor exertion during periods of stagnant air or visible haze.