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Puerto Morazán, nestled in the Chinandega department of Nicaragua, occupies a geographically significant position along the lower reaches of the Río Grande de Matagalpa. The city’s coordinates, 12.8500° N, -87.1833° W, place it within a relatively flat, alluvial plain, typical of the Pacific lowlands of Nicaragua. Elevation is minimal, contributing to potential temperature inversions that can trap pollutants. The surrounding landscape is dominated by agricultural land, primarily dedicated to sugarcane and cattle ranching, with pockets of remnant tropical dry forest. Puerto Morazán’s location near the mouth of the Río Grande, before it empties into the Golfo de Fonseca, introduces a degree of humidity and influences local wind patterns. The urban-rural gradient is quite sharp; the city itself is compact, transitioning rapidly into expansive agricultural fields. This proximity to intensive agriculture is a key factor influencing air quality, as agricultural practices often involve burning and the use of pesticides and fertilizers. The lack of significant industrial belts within the city limits means that agricultural emissions are likely the dominant source of pollution, though regional transport from larger centres is possible. The terrain offers little natural dispersion for pollutants, exacerbating the impact of local emission sources.

Puerto Morazán experiences a distinct bimodal rainfall pattern, defining its ‘seasons’ rather than the traditional four. The dry season, typically from November to April, sees a significant increase in particulate matter due to agricultural burning for land preparation and sugarcane harvesting. Lower humidity and stable atmospheric conditions during these months exacerbate pollution, creating periods of reduced visibility and increased respiratory irritation. February and March are generally the worst months for air quality. The transition periods (April/May and October/November) bring fluctuating conditions, with occasional rainfall offering temporary relief. The wet season, spanning May to October, generally offers improved air quality as rainfall washes away pollutants and suppresses dust. However, increased humidity can also promote the formation of mold and mildew, impacting indoor air quality. September and October, during the peak of the rainy season, are usually the most favourable for outdoor activities. Sensitive groups – children, the elderly, and those with pre-existing respiratory conditions – should limit outdoor exposure during the dry season and monitor their health closely. Increased ventilation indoors is recommended during the wet season to mitigate mold growth.