Heavy Metals

X² (2)

p-value

Mean Rank (Industrial)

Mean Rank (Roadside)

Mean Rank (Commercial)

Mean Rank (Residential/Parkland)

Lead (Pb)

14.229

0.003*

20.80

12.50

13.25

6.90

Arsenic (As)

13.365

0.004*

16.40

16.00

17.13

6.15

Chromium (Cr)

16.342

0.001*

19.40

16.00

14.38

5.75

Cadmium (Cd)

14.951

0.002*

21.00

12.75

13.00

6.80

Nickel (Ni)

10.645

0.014*

18.60

14.75

12.50

7.40

Zinc (Zn)

15.24

0.002*

19.40

15.25

14.50

6.00

Manganese (Mn)

16.567

0.001*

18.80

17.50

13.750

5.70

Mercury (Hg)

11.812

0.008*

17.40

10.50

10.50

10.50