Origin/year	Pi				THQ
Origin/year	Average value	Maximum value	Minimum value	Pollution level	Average value	Maximum value	Minimum value	Health risks
S1	0.0120	0.0235	0.0050	Excellent	0.0013	0.0025	0.0005	no
S2	0.0077	0.0152	0.0050	Excellent	0.0008	0.0016	0.0005	no
S3	0.0175	0.0519	0.0050	Excellent	0.0019	0.0056	0.0005	no
S4	0.0132	0.0322	0.0050	Excellent	0.0014	0.0035	0.0005	no
S5	0.1525	0.1890	0.1185	Excellent	0.0165	0.0204	0.0128	no
S6	0.0050	0.0050	0.0050	Excellent	0.0005	0.0005	0.0005	no
S7	0.0058	0.0130	0.0050	Excellent	0.0006	0.0014	0.0005	no
2019	0.0406	0.1890	0.0050	Excellent	0.0044	0.0204	0.0005	no
2020	0.0054	0.0130	0.0050	Excellent	0.0006	0.0014	0.0005	no
2019 - 2020	0.0305	0.1890	0.0050	Excellent	0.0033	0.0204	0.0005	no