Exploration of the spatially varying relationships between lead and aluminium concentrations in the topsoil of northern half of Ireland using Geographically Weighted Pearson Correlation Coefficient

•GWPCC revealed the spatially varying relationships between Pb and Al in soils.•Negative correlations mainly occurred in western and north-eastern areas.•Positive correlations clustered in central-western and midland areas.•Atmospheric deposition contributed to the negative correlations on blanket peat.•Anthropogenic factors weakened the relationships in eastern coastal regions.