Table 7.

Pollution indices (Igeo, EF & CF) for heavy metals in soils.

Pollution indices	Elements	Mean	Maximum	Minimum	% of samples exceeding limits
					< 0	0 < 1	1 < 2	2 < 3	3 < 4	4 < 5	> 5
Igeo	As	0.1	1.2	− 2.8	18	69	13	0	0	0	0
	Cr	3.6	4.2	1.8	0	0	0.7	0	93.6	5.7	0
	Cu	3.4	4.5	2.0	0	0	0	2	88	10	0
	Ni	2.9	3.4	2.2	0	0	0	60.5	39.5	0	0
	Pb	2.7	4.3	2.0	0	0	0	80.5	18.8	0.7	0
	Zn	3.9	4.6	3.4	0	0	0	0	53.3	46.7	0

	Elements	Minimum	Maximum	Mean	% of samples exceeding limits
					< 2	2–5	5–20	20–40	> 40
EF	As	0.0	8.1	0.7	89.9	7.1	3	0	0
	Cr	0.1	4.9	1.6	74.8	25.2	0	0	0
	Cu	0.3	28.7	2.9	69	16.5	13	1.5	0
	Ni	1	1	1	100	0	0	0	0
	Pb	0.0	25.7	1.0	89	9.6	0.7	0.7	0
	Zn	0.2	4.9	0.9	95	5	0	0	0

	Elements	Minimum	Maximum	Mean	% of samples exceeding limits
					< 1	1 < 3	3 < 6	> 6
CF	As	0.0	10.6	2.1	39.5	41.7	3.5	15.1
	Cr	0.0	20.2	5.8	0.7	5.7	61.8	31.6
	Cu	0.0	9.1	0.9	74.8	17.9	5.7	1.4
	Ni	0.7	11.7	3.6	1.4	10	87	1.4
	Pb	0.4	83.2	3.4	13.6	64	9.3	12.9
	Zn	0.8	13.5	3.2	2.1	51.7	41.7	4.3