Sampling Location

Date

Maximum reading

(ppb)

Mean ± S.D

(ppb)

Mapipa, Dar es Salaam

Feb. (1-7) 2012

31

15 ± 2.3

Kunduchi, Dar es Salaam

Feb. (1-7) 2012

32

19 ± 2.3

Kunduchi, Dar es Salaam

Jun. (1-7) 2013

44

17 ± 6.6

Ubungo, Dar es Salaam

Jun. (17-23) 2013

25

13 ± 2.7

Post, Dar es Salaam

Jun. (17-23) 2013

33

16 ± 2.6

Vijibweni, Dar es Salaam

Jun.-14

29

14 ± 5.2

Jul.-14

18

11.6 ± 2.6

Aug.-14

41

18.3 ± 8

Sep.-14

32

15 ± 6.5

Oct.-14

33

14 ± 5.1

Nov.-14

33

15 ± 8.9

Dec.-14

34

20.5 ± 1.7

Jan.-15

49

28.6 ± 1.4

Mwetemo, Bagamoyo

Dec.-13

23

17.4 ± 3.0

Jan.-14

24

14.5 ± 0.7

Feb.-14

36

14 ± 1.1

Mar.-14

28

9.6 ± 0.5

Apr.-14

26

8.9 ± 1.0

May-14

24

9.6 ± 0.5

Jun.-14

27

10.6 ± 1.9

Jul.-14

27

12.2 ± 1.1

Aug.-14

33

11.8 ± 2.5

Sep.-14

30

13.4 ± 1.5

Oct.-14

25

10.4 ± 2.0