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River Pollutant Index
| Quality status | Pollutant Index | |||||
|---|---|---|---|---|---|---|
| 2004 (%) | 2005 (%) | 2006 (%) | 2007 (%) | 2008 (%) | 2009 (%) | |
| Good | 0 | 0 | 3 | 0 | 0 | 0 |
| Low polluted | 3 | 5 | 9 | 0 | 0 | 9 |
| Moderate polluted | 16 | 16 | 10 | 6 | 12 | 9 |
| High polluted | 81 | 79 | 78 | 94 | 88 | 82 |
| Total | 100 | 100 | 100 | 100 | 10 | 100 |
