Research Article
Natural Background Level and Contamination of Shallow Groundwater Salinity in Various Aquifers in a Coastal Urbanized Area, South China
Table 2
Groundwater salinity contamination in areas with different urbanization levels in the Pearl River Delta.
| Contamination levels | PRD | Unit A | Unit B | Unit C | UA | PUA | NUA | UA | PUA | NUA | UA | PUA | NUA | UA | PUA | NUA |
| Uncontaminated (%) | 70.3 | 75 | 90.9 | 57.4 | 76.8 | 81.5 | 77.3 | 80.5 | 97.5 | 80 | 68.4 | 91.8 | Low (%) | 24.3 | 18.5 | 7.0 | 40.7 | 18.6 | 11.1 | 17 | 17.1 | 2.5 | 12.5 | 21.1 | 8.2 | Moderate (%) | 4.7 | 5.6 | 1.4 | 1.9 | 2.3 | 3.7 | 3.8 | 2.4 | 0 | 7.5 | 10.5 | 0 | High (%) | 0.7 | 0.9 | 0.7 | 0 | 2.3 | 3.7 | 1.9 | 0 | 0 | 0 | 0 | 0 |
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