Figure 3
The figure consists of two vertical bar graphs with error bars that indicate variability in the measurements. The first graph to the left is labeled “a)”. The horizontal axis consists of three vertical bars arranged from left to right. The vertical axis ranges from 0,8 to 2,0 in increments of 0,2 units. The legend at the bottom identifies bars for “I P I”, “P I Nemerow”, and “P L I”, which reflect the bars arranged from left to right across the horizontal axis. A horizontal reference line is drawn at 1,0 and also at 2,0. The data for the bars are as follows: I P I: 1,79 with an error bar ranging from about 1,70 to 1,88. P I Nemerow: 1,63 with an error bar ranging from about 1,55 to 1,71. P L I: 1,69 with an error bar ranging from about 1,61 to 1,78. The second graph to the right is labeled “b)”. The horizontal axis consists of two vertical bars arranged from left to right. The vertical axis ranges from 1,0 to 8,0 in increments of 1,0 units. The legend at the bottom identifies bars for “Degree of contamination” and “modified degree of contamination”, which reflect the bars arranged from left to right across the horizontal axis. A horizontal reference line is drawn above the first bar at 8,0 and 4 horizontal reference lines are drawn for the second bar at “1,5”, “2,0”, “4,0”, “8,0”. The data for the bars are as follows: Degree of contamination: 7,0 with an error bar ranging from about 6,6 to 7,4. Modified degree of contamination: 1,75 with an error bar ranging from about 1,65 to 1,85. Note: All the numerical data values are approximated.Own elaboration graph comparing integrated contamination metrics: (a) Integrated Pollution Index (IPI), Nemerow Pollution Index (PI_Nemerow), and Pollution Load Index (PLI); (b) Degree of contamination (Cdeg) and modified degree (mCdeg). Class boundaries as specified in Table 2 index definitions after Weissmannová and Pavlovský (2017), Caeiro et al. (2005) and Abrahim and Parker (2008). Error bars represent ± standard deviation of analytical triplicates