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Esquipulas, nestled in the Chiquimula Department of Guatemala, occupies a geographically significant position within the country’s eastern lowlands. Located at approximately 14.5667° N, 89.35° W and an elevation of roughly 250 meters (820 feet) above sea level, the city sits on a gently sloping plain, part of the broader Motagua River basin. This basin is characterized by a mix of agricultural lands, primarily dedicated to sugarcane and maize cultivation, which significantly influences the regional landscape. The surrounding terrain is relatively flat, transitioning into slightly undulating hills further afield, creating a gradual urban–rural gradient. The proximity to the Motagua River, a major waterway, provides a source of water but also presents potential risks related to flooding and sediment transport, which can impact local air quality. While Esquipulas itself lacks major industrial zones within its immediate boundaries, it serves as a vital transportation hub, connecting Guatemala with Honduras, and experiences considerable vehicular traffic. This transit role, combined with agricultural activities and residential heating practices (often utilizing wood or charcoal), contributes to localized air pollution. The prevailing winds, generally easterly, can transport pollutants from agricultural burning practices in surrounding areas, impacting Esquipulas’ air quality. The relatively flat topography limits dispersion of pollutants, particularly during periods of calm weather, exacerbating the effects of local emissions. The landscape is dominated by agricultural fields interspersed with small villages and scattered patches of tropical dry forest, further shaping the regional atmospheric conditions.

Esquipulas experiences a tropical savanna climate, characterized by distinct wet and dry seasons rather than the four traditional seasons. The dry season, typically spanning from November to April, presents a unique set of air quality challenges. Reduced rainfall leads to lower atmospheric moisture, which can trap pollutants closer to the ground. Agricultural burning, a common practice for land clearing and sugarcane preparation, intensifies during this period, releasing significant amounts of particulate matter and other harmful gases. Temperature inversions, where cooler air is trapped beneath a layer of warmer air, are also more frequent during the dry season, further hindering pollutant dispersion. The months of January and February often see the poorest air quality due to the combined effects of burning and stable atmospheric conditions. Conversely, the wet season (May to October) brings increased rainfall, which naturally washes pollutants from the atmosphere. Higher humidity also aids in the removal of particulate matter. However, heavy rainfall can lead to increased soil erosion and dust storms, temporarily degrading air quality. Stronger winds associated with the wet season generally improve ventilation and disperse pollutants. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should exercise caution during the dry season, limiting outdoor activities during peak burning periods and avoiding areas with visible smoke. Maintaining indoor air quality through proper ventilation and air filtration is also recommended. The transition months (April and November) often experience variable conditions, with a mix of dry and wet season characteristics, requiring adaptable health precautions.