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Barahona, nestled within the Enriquillo province of the Dominican Republic, occupies a geographically significant position on the southwestern coast. Its coordinates, 18.2079° N, -71.0996° W, place it within a subtropical climate zone, heavily influenced by the Caribbean Sea. The city’s terrain is characterized by a gradual slope towards the coast, transitioning from low-lying plains to gently undulating hills. This topography, combined with prevailing trade winds, can significantly impact local air circulation patterns. Barahona is strategically located near Laguna Ovejuela, a vital wetland ecosystem and part of the larger Enriquillo basin, which influences humidity and local weather systems. The surrounding landscape is a mix of agricultural lands – primarily sugarcane and banana plantations – and areas of dry forest, contributing to both potential sources and sinks for air pollutants. The urban–rural gradient is relatively sharp; Barahona itself is a moderately sized urban center, quickly giving way to agricultural and natural landscapes. While not directly adjacent to major industrial belts, the transportation of agricultural goods, particularly sugarcane processing, introduces localized pollution risks. The proximity to the Caribbean Sea also means the city is susceptible to marine influences, including salt spray and occasional episodes of dust transported from the Sahara Desert, impacting air quality. The relatively low elevation (averaging around 30 meters above sea level) limits vertical dispersion of pollutants, potentially leading to ground-level concentrations.

Barahona’s tropical climate dictates a distinct wet and dry season pattern, profoundly influencing its air quality. The dry season, typically spanning December to April, often sees a slight improvement in air quality due to reduced rainfall and lower humidity. However, this period can also experience stagnant air conditions, particularly during temperature inversions, where a layer of warm air traps cooler air near the ground, hindering pollutant dispersal. Agricultural burning, a common practice for land clearing and sugarcane preparation, is most prevalent during the transition into the dry season (November-December), leading to noticeable spikes in particulate matter. The wet season, from May to October, brings frequent rainfall, which naturally helps to cleanse the atmosphere by removing airborne particles. However, heavy downpours can also mobilize dust and soil, temporarily degrading air quality. The intensity of the trade winds fluctuates seasonally; stronger winds during the wet season generally promote better ventilation. Fog, though infrequent, can occur during cooler nights, trapping pollutants and reducing visibility. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should exercise caution during periods of agricultural burning and when stagnant air conditions are predicted. Outdoor activities are generally more favorable during the wet season, particularly after rainfall events, but vigilance regarding dust storms remains important. The transition months (April/May and October/November) often present the most variable air quality conditions, requiring careful monitoring and adaptive strategies.