Jan

Feb

Mar

Apr

May

Jun

Jul

Aug

Sep

Oct

Nov

Dec

Excellent

No. cities

0

4

3

3

14

12

18

18

14

0

3

1

%

0

2.48

1.86

1.86

8.7

7.45

11.18

11.18

8.7

0

1.86

0.62

Good

No. cities

34

70

86

110

83

106

117

125

134

98

94

85

%

21.12

43.48

53.42

68.32

51.55

65.84

72.67

77.64

83.23

60.87

58.39

52.8

Light polluted

No. cities

60

61

62

43

63

43

26

18

13

54

52

64

%

37.27

37.89

38.51

26.71

39.13

26.71

16.15

11.18

8.07

33.54

32.3

39.75

Moderately polluted

No. cities

67

26

10

5

1

0

0

0

0

9

12

11

%

41.61

16.15

6.21

3.11

0.62

0

0

0

0

5.59

7.45

6.83