conc Area
21.3 Polluted  
18.7 Polluted  
23.0 Polluted  
17.1 Polluted  
16.8 Polluted  
20.9 Polluted  
19.7 Polluted  
14.2 Unpolluted
18.3 Unpolluted
17.2 Unpolluted
18.4 Unpolluted
20.0 Unpolluted