Table 2 Classification of integrated...

Table 2

Classification of integrated indices (IPI, PI_Nemerow, PLI, C_deg and mC_deg,) and indices of ecological risk (Erⁱ and RI)

Index	Formula	Value	Classification
Integrated Pollution Index (IPI)	$IPI = mean ({PI}_{i})$	IPI ≤1	Lightly polluted
		1 < IPI <2	Moderately polluted
		2 ≤ IPI	Heavily polluted
Nemerow Pollution Index (PI_Nemerow)	${PI}_{Nemerow} = \sqrt{\frac{{PI}_{avg}^{2} + {PI}_{Max}^{2}}{n}}$	PI_Nemerow ≤ 0,7	Clean
		0,7 < PI_Nemerow < 1	Warning limit
		1 < PI_Nemerow < 2	Slightly polluted
		2 < PI_Nemerow > 3	Moderately polluted
		3 ≤ PI_Nemerow	Heavily polluted
Pollution Load Index (PLI)	$PLI = \sqrt[n]{{CF}_{1} \cdot {CF}_{2} \cdot {CF}_{3} . . . \cdot {CF}_{n}}$	PLI ≤1	Unpolluted
		1 < PLI <2	Unpolluted to slightly polluted
		2 < PLI <3	Slightly polluted
		3 < PLI <4	Slightly to highly polluted
		4 < PLI <5	Highly polluted
		5 ≤ PLI	Very highly polluted
Degree of Contamination (C_deg)	$C_{\deg} = \sum_{i = 1}^{n} {CF}_{i}$	C_deg ≤ 8	Low degree of contamination
		8 < C_deg < 16	Moderate degree of contamination
		16 < C_deg < 32	Considerable degree of contamination
		32 ≤ C_deg	Very high degree of contamination
Modified Degree of Contamination (mC_deg)	${mC}_{\deg} = \frac{1}{n} \sum_{i = 1}^{n} {CF}_{i}$	mC_deg ≤ 1,5	Very low degree of contamination
		1,5 < mC_deg < 2	Low degree of contamination
		2 < mC_deg < 4	Moderate degree of contamination
		4 < mC_deg < 8	High degree of contamination
		8 < mC_deg < 16	Very high degree of contamination
		16 < mC_deg < 32	Extremely high degree of contamination
		32 ≤ mC_deg	Ultra high degree of contamination
Potential Ecological Risk (Erⁱ)	$E_{r}^{i} = T_{r}^{i} \cdot C_{f}^{i}$	Erⁱ ≤ 40	Low ecological risk
		40 < Erⁱ < 80	Moderate ecological risk
		80 < Erⁱ < 160	Considerable ecological risk
		160 < Erⁱ < 320	High ecological risk
		320 ≤ Erⁱ	Very high ecological risk
Ecological Risk Index (RI)	$RI = \sum_{i = 1}^{n} E_{r}^{i}$	RI ≤ 150	Low ecological risk
		150 < RI < 300	Moderate ecological risk
		300 < RI < 600	High ecological risk
		600 ≤ RI	Very high ecological risk

Index	Formula	Value	Classification
Integrated Pollution Index (IPI)	$IPI = mean ({PI}_{i})$	IPI ≤1	Lightly polluted
		1 < IPI <2	Moderately polluted
		2 ≤ IPI	Heavily polluted
Nemerow Pollution Index (PI_Nemerow)	${PI}_{Nemerow} = \sqrt{\frac{{PI}_{avg}^{2} + {PI}_{Max}^{2}}{n}}$	PI_Nemerow ≤ 0,7	Clean
		0,7 < PI_Nemerow < 1	Warning limit
		1 < PI_Nemerow < 2	Slightly polluted
		2 < PI_Nemerow > 3	Moderately polluted
		3 ≤ PI_Nemerow	Heavily polluted
Pollution Load Index (PLI)	$PLI = \sqrt[n]{{CF}_{1} \cdot {CF}_{2} \cdot {CF}_{3} . . . \cdot {CF}_{n}}$	PLI ≤1	Unpolluted
		1 < PLI <2	Unpolluted to slightly polluted
		2 < PLI <3	Slightly polluted
		3 < PLI <4	Slightly to highly polluted
		4 < PLI <5	Highly polluted
		5 ≤ PLI	Very highly polluted
Degree of Contamination (C_deg)	$C_{\deg} = \sum_{i = 1}^{n} {CF}_{i}$	C_deg ≤ 8	Low degree of contamination
		8 < C_deg < 16	Moderate degree of contamination
		16 < C_deg < 32	Considerable degree of contamination
		32 ≤ C_deg	Very high degree of contamination
Modified Degree of Contamination (mC_deg)	${mC}_{\deg} = \frac{1}{n} \sum_{i = 1}^{n} {CF}_{i}$	mC_deg ≤ 1,5	Very low degree of contamination
		1,5 < mC_deg < 2	Low degree of contamination
		2 < mC_deg < 4	Moderate degree of contamination
		4 < mC_deg < 8	High degree of contamination
		8 < mC_deg < 16	Very high degree of contamination
		16 < mC_deg < 32	Extremely high degree of contamination
		32 ≤ mC_deg	Ultra high degree of contamination
Potential Ecological Risk (Erⁱ)	$E_{r}^{i} = T_{r}^{i} \cdot C_{f}^{i}$	Erⁱ ≤ 40	Low ecological risk
		40 < Erⁱ < 80	Moderate ecological risk
		80 < Erⁱ < 160	Considerable ecological risk
		160 < Erⁱ < 320	High ecological risk
		320 ≤ Erⁱ	Very high ecological risk
Ecological Risk Index (RI)	$RI = \sum_{i = 1}^{n} E_{r}^{i}$	RI ≤ 150	Low ecological risk
		150 < RI < 300	Moderate ecological risk
		300 < RI < 600	High ecological risk
		600 ≤ RI	Very high ecological risk

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