Subgroup

PM2.5 μg/m3 NRMa

Mean

SD

Min

5%

95%

Max

N

Total

6.8

4.1

0.3

1.5

14.3

42.2

431

NWb

6.2

3.7

0.3

1.6

13.5

42.2

133

SWc

4.9

3.4

0.3

1.1

11.2

36.1

63

NCd

4.7

3.4

0.3

0.9

11.1

35.4

42

SCe

7.9

3.9

0.5

1.9

14.4

29.1

95

NEf

8.5

4.0

1.8

3.3

15.9

26.5

58

SEg

10.3

3.8

1.8

5.1

17.5

29.1

40

Mar-May

6.4

3.5

0.6

1.9

12.8

24.7

400

Jun-Aug

7.9

4.3

1.3

3.0

16.1

40.4

413

Sep-Nov

6.7

3.8

0.4

1.9

13.8

34.0

412

Dec-Feb

6.2

4.4

0.3

0.8

14.2

42.2

415