2.2.2. Regional difference analysis of water pollution emissions
levels
2.2.2.1. The methods of standardization. We standardized the pollution
emissions intensity index of industrial and municipal
wastewater, COD and NH3-N from 2003 to 2010. Then, we computed
the sum of the weight-standardized index to generate a
composite index of water pollution emissions intensity. Further,
we studied the potential of regional wastewater emissions reduction
and analyzed the urgency degree derived from the emission
index. We standardized original data by an extreme method to
develop a standardized indicator variable ranging from zero to one,
as expressed in Eq. (2-3):