MONTH

[O3] OBS

[O3] EST

ERM

C

Jan

10.32

13.07

−0.27

0.88

Feb

12.08

13.55

−0.12

0.88

Mar

13.28

14.34

−0.08

0.84

Apr

13.88

14.08

−0.01

0.83

May

14.66

11.40

0.22

0.73

Jun

14.93

15.54

−0.04

0.69

Jul

15.54

20.50

−0.32

0.56

Aug

24.29

24.57

−0.01

0.87

Sep

29.69

26.30

0.11

0.86

Oct

26.79

21.19

0.21

0.79

Nov

21.20

19.84

0.06

0.82

Dec

16.10

14.49

0.10

0.68