Table 1 Muller's classification for the geoaccumulation index I geo value Class Soil quality ≤0 0 Unpolluted 0 1 1 From unpolluted to moderately polluted 1 2 2 Moderately polluted 2 3 3 From moderately to strongly polluted 3 4 4 Strongly polluted 4 5 5 From strongly to extremely polluted >6 6 Extremely polluted.
The following categorizations are given by Muller ([1969]) for geoaccumulation index: Igeo < 0 indicates unpolluted, Igeo = 0 to 1 unpolluted to moderately polluted, Igeo = 1 to 2 moderately polluted, Igeo = 2 to 3 moderately to strongly polluted, Igeo = 3 to 4 strongly polluted, Igeo = 4 to 5 strongly to extremely <span class="lh">polluted, and Igeo > 5 demonstrates extremely polluted.
I geo ≤ 0, class 0, unpolluted; 0 < I geo ≤ 1, class 1, from unpolluted to moderately polluted; 1 < I geo ≤ 2, class 2, moderately polluted; 2 < I geo ≤ 3, class 3, from moderately to strongly polluted; 3 < I geo ≤ 4, class 4, strongly polluted; 4 < I geo ≤ 5, class 5, from strongly to extremely polluted; and I geo > 5, class 6, extremely polluted [16].
Plants help by slurping up groundwater and giving the bacteria the time and place they need to work, but if the soil is extremely polluted, the plants die.
According to the criteria of appreciation of the surface water quality, this river can be classified as not being extremely polluted.
From a physical point of view, before the Games, the Olympic site was a complex area, very disaggregated and fragmented, full of rivers and canals, and extremely polluted.
Juncus acutus, an halophite plant pioneer in extremely polluted mine areas, was harvested in three different locations of Sardinia Italyy), having Zn soil concentration up to 80 g/kg, and Zn water concentration ranging between 10−3 g/L and 10−1 g/L.
The cyclists argue that the streets of Tel Aviv and Jerusalem are extremely polluted and they wanted the government to promote urban cycling.
