| Year | Monthly Average Ambient Air Quality Index | |||||||||||
| January | February | March | April | May | June | July | August | September | October | November | December | |
| 2014 | 229 | 122 | 110 | 87 | 112 | 119 | 81 | 78 | 74 | 123 | 105 | 114 |
| 2015 | 161 | 142 | 94 | 87 | 101 | 73 | 76 | 90 | 92 | 101 | 78 | 146 |
| 2016 | 144 | 113 | 115 | 76 | 76 | 69 | 70 | 86 | 94 | 60 | 84 | 123 |
| 2017 | 119 | 101 | 94 | 80 | 104 | 75 | 63 | 65 | 74 | 62 | 105 | 130 |
| 2018 | 116 | 89 | 78 | 65 | 63 | 96 | 66 | 82 | 68 | 80 | 88 | 98 |
| 2019 | 125 | 87 | 79 |
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