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 |