Water ponds clean quality no. 1 in March, and survey the average pollution in June and October. Ponds of water quality on 2 all three waves of the survey. On the waves of the survey in March and October, 3 ponds clean quality. In the June survey, the quality of the water in the pond to reach the average pollution. Ponds of 4 water quality reaches the average pollution levels across all three waves of the survey. Three waves of survey shows that the water quality of ponds remain fit to maintain and develop models of ao.
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