Fig. 2From: Human health and ecology at risk: a case study of metal pollution in Lahore, PakistanSpatial heat map showing metal concentrations exceeding the threshold limits. The exceedance is calculated as the ratio between the detected concentration and the permissible limits set by the World Health Organization (WHO). Values are presented for water samples collected from groundwater (GW), canals (CW), river (RW) and drains (DW)Back to article page