Resumen -En este trabajo se analiza la acidez de la precipitación en la Península Ibérica durante el periodo 1986-1997. Los principales objetivos son analizar la variabilidad, estacionalidad y tendencia del pH. Los resultados obtenidos muestran que la acidez de la precipitación es mayor en Portugal que en España, aunque en ambos países se registran valores de pH claramente ácidos. En general, la variabilidad del pH se caracteriza por ser menor en Portugal. También se detecta en ambos países un ciclo estacional con un mínimo claramente marcado en verano y un máximo en invierno. El análisis de tendencia muestra una evolución del pH creciente y significativa en la Península Ibérica, a excepción de la estación de Noia donde la tendencia observada es decreciente.Palabras Clave: precipitación ácida, pH, EMEP, Portugal, España, tendencia.Abstract -ACIDITY OF PRECIPITATION IN THE IBERIAN PENINSULA -Acidity of precipitation in the Iberian Peninsula between 1986 and 1997 is studied in this paper. The main objectives are the analysis of its variability, seasonal cycle, and trend. The results show a higher acidity of precipitation in Portugal than in Spain, although precipitation is acid in both countries. In general, the pH variability is lower in Portugal than in Spain. In both countries there is a seasonal cycle with a clear minimum in summer and a maximum in winter. The trend analysis shows a pH that is increasing in Portugal and Spain, except at Noia station where the observed trend is decreasing.Key words: acid precipitation, pH, EMEP, Portugal, Spain, trend.Resumo-ANÁLISE DA ACIDEZ DA PRECIPITAÇÃO NA PENÍNSULA IBÉRICA -Analisa-se a acidez da precipitação na Península Ibérica, durante o período 1986-1997. Os principais objectivos são o estudo da variabilidade e da tendência do pH da precipitação. Os resultados mostram que a acidez da precipitação é mais acentuada nos locais de medição portugueses, embora, em ambos os países, se registem ----------------
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