carry out related research. The Nemerow’s pollution index is an environmental
quality index used to calculate the hazard of various pollutants, which can better
highlight the role of extreme values.
• Traditional Nemerow’s integrated pollution index
The equations for calculation are written as follows:
P i ¼
C i
C 0ij
ð3:4Þ
P iave ¼
P n
i¼1 P i
n
ð3:5Þ
P int ¼
ffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffi
P 2
iave þ P 2
imax
2
r
ð3:6Þ
Wherein P i is the Nemerow’s pollution index of pollutant i; C i is the measured
concentration of pollutant i, expressed by mg/L; C 0ij is the limit of water quality
standard j for pollutant i, expressed by mg/L; P iave is the average Nemerow’s
pollution index of n kinds of pollutants; P imax is the maximum Nemerow’s pollution index of n kinds of pollutants; P com is the Nemerow’s integrated pollution
index under water quality standard j; n is the number of pollutants; j is the selected
water quality standard (I–V).
• Refined Nemerow’s integrated pollution index
The Nemerow’s integrated pollution index is revised to differentiate pollution
factors at the same level of quality by increasing the weighting factors in the
calculation process. The refined method highlights the extreme values and reflects
more scientifically the contribution of different pollutants to the groundwater
environment.
The specific steps are described as follows:
First, the concentration and standard for pollutant i are compared based on the
Quality Standards for Groundwater (GB/T14848–93), and then the score of pollutant i is determined according to Table 3.8.
The characteristic properties of pollutants include concentration, toxicity,
migration, degradation and etc. Based on identified priority groundwater pollutants,
the refined Nemerow’s integrated pollution index introduces the weighted sequence
of pollutants (l i ) in the calculation and replaces L iave (average score of n kinds of
pollutants) with L wei ave (weighted average score of n kinds of pollutants). L wei ave
is calculated using Eq. (3.7):
Table 3.8 Groundwater
quality score
Level
I
II
III
IV
V
L i
0
1
3
6
1 0
3.2 Method of Groundwater Pollution Source Intensity Rating …
49
quality index used to calculate the hazard of various pollutants, which can better
highlight the role of extreme values.
• Traditional Nemerow’s integrated pollution index
The equations for calculation are written as follows:
P i ¼
C i
C 0ij
ð3:4Þ
P iave ¼
P n
i¼1 P i
n
ð3:5Þ
P int ¼
ffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffi
P 2
iave þ P 2
imax
2
r
ð3:6Þ
Wherein P i is the Nemerow’s pollution index of pollutant i; C i is the measured
concentration of pollutant i, expressed by mg/L; C 0ij is the limit of water quality
standard j for pollutant i, expressed by mg/L; P iave is the average Nemerow’s
pollution index of n kinds of pollutants; P imax is the maximum Nemerow’s pollution index of n kinds of pollutants; P com is the Nemerow’s integrated pollution
index under water quality standard j; n is the number of pollutants; j is the selected
water quality standard (I–V).
• Refined Nemerow’s integrated pollution index
The Nemerow’s integrated pollution index is revised to differentiate pollution
factors at the same level of quality by increasing the weighting factors in the
calculation process. The refined method highlights the extreme values and reflects
more scientifically the contribution of different pollutants to the groundwater
environment.
The specific steps are described as follows:
First, the concentration and standard for pollutant i are compared based on the
Quality Standards for Groundwater (GB/T14848–93), and then the score of pollutant i is determined according to Table 3.8.
The characteristic properties of pollutants include concentration, toxicity,
migration, degradation and etc. Based on identified priority groundwater pollutants,
the refined Nemerow’s integrated pollution index introduces the weighted sequence
of pollutants (l i ) in the calculation and replaces L iave (average score of n kinds of
pollutants) with L wei ave (weighted average score of n kinds of pollutants). L wei ave
is calculated using Eq. (3.7):
Table 3.8 Groundwater
quality score
Level
I
II
III
IV
V
L i
0
1
3
6
1 0
3.2 Method of Groundwater Pollution Source Intensity Rating …
49