Table 2 Mean (± SD) concentrations of PM_2.5 (μg/m3) from 2006–2011 in the study areas

18

27.32 ± 4.34

27.43 ± 5.03

28.69 ± 5.39

27.33 ± 5.48

25.96 ± 5.32

25.98 ± 5.37

26.61 ± 5.30

12

28.65 ± 2.13

29.81 ± 2.34

29.39 ± 2.98

29.75 ± 2.59

28.74 ± 2.47

26.93 ± 1.82

27.28 ± 2.84

16

35.72 ± 3.75

36.27 ± 3.20

36.64 ± 3.81

35.56 ± 3.76

37.67 ± 3.63

34.83 ± 3.02

36.17 ± 5.34

7

39.81 ± 2.10

40.75 ± 2.30

41.00 ± 2.91

41.62 ± 3.37

40.08 ± 3.41

36.81 ± 3.15

38.05 ± 4.04