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Se analizó el agua de lluvia en la metrópoli de Calabar para establecer sus características químicas y sus influencias e idoneidad para la agricultura. El muestreo se realizó durante los ciclos estacionales secos y de lluvias a lo largo de tres años (2018-2021). Se hicieron mediciones del pH, la conductividad eléctrica y los iones mayoritarios: Ca2+, Na+, Mg2+, K+, HCO3-, Cl- y SO42-. Se hizo un análisis de componentes principales y de proporciones iónicas para establecer las relaciones entre las especies iónicas y proyectar sus fuentes. La idoneidad del agua de lluvia para uso agrícola también se determinó mediante el cálculo de la proporción de absorción del sodio y el magnesio. Los resultados indicaron una tendencia de abundancia relativa de cationes de Ca > Mg > K > Na, en tanto que HCO3 > SO4 > Cl fue la tendencia de los aniones. El pH varió de 6,1 a 7,8 (con una media de 6,60), lo que conjuntamente con la conductividad eléctrica refleja las influencias de los gases atmosféricos y los sólidos disueltos en las nubes. La media ponderada por volumen de las especies iónicas fue de 246 eq/l para la estación húmeda y de 198 eq/l para la estación seca, lo que indica una contaminación atmosférica de baja a moderada. Los flujos de deposición húmeda para los contenidos iónicos totales en el agua de lluvia fueron más altos en la estación húmeda, lo que indica el impacto de la lluvia. El análisis de componentes principales y las proporciones iónicas evidenciaron que las concentraciones iónicas eran predominantemente de origen marino y de la corteza. Las características químicas del agua de lluvia en el área de estudio comparadas con los intervalos de las concentraciones de otras ubicaciones con entornos geológicos similares e índices de contaminación de bajos a moderados fueron muy similares. La evaluación del agua de lluvia para uso agrícola basada en las proporciones de absorción de sodio y magnesio evidenció buenos niveles de idoneidad.
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