An innovative greywater treatment system for urban areas ... - SuSanA

Table 26: Water quality index (WQI) based on the 32 countries selected for investigation; (Yale
University, 2010)
3.7.3 POPULATION DENSITY
Country WQI
Rating
1 South Africa 84.2
2 Peru 83.4
3 Spain 83.1
4 India 78.9
5 United States of America 77.5
6 China 68.0
7 Tunisia 63.0
8 Morocco 62.9
9 Pakistan 62.6
10 Egypt 62.4
11 Australia 61.7
12 Mexico 61.4
13 Algeria 58.3
14 Turkey 57.9
15 Israel 57.7
16 Iran 49.8
17 Libyan Arab Jamahiriya 49.4
18 Madagascar 47.6
19 Mozambique 46.6
20 Turkmenistan 45.0
21 Syria 45.0
22 Afghanistan 44.8
23 Oman 44.2
24 Kazakhstan 43.4
25 Saudi Arabia 42.4
26 Kyrgyzstan 41.3
27 Lebanon 40.6
28 Uzbekistan 38.0
29 Jordan 30
30 Western Sahara -
31 United Arab Emirates -
32 Yemen -
The assessment of population density, by "physiological population density" in
persons/km 2 arable land, showed high values in MENA region. In particular, Egypt, Israel,
Lebanon, Oman, United Arab Emirates, Western Sahara and Yemen, are densely populated.
Here often the countries have a high proportion of desert and therefore the population lives in
very limited areas of the country. The physiological population density worldwide is shown in
Figure 24.
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