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Table 1

The classification of comprehensive pollution index

Comprehensive pollution index≤ 0.80.8 < CPI ≤ 1.01.0 < CPI ≤ 2.0CPI > 2.0
Water quality grade Good Qualified Polluted Heavily polluted 
Comprehensive pollution index≤ 0.80.8 < CPI ≤ 1.01.0 < CPI ≤ 2.0CPI > 2.0
Water quality grade Good Qualified Polluted Heavily polluted 
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