| index | 2018-02 | 2018-01 | 2017-12 | 2017-11 | 2017-10 | 2017-09 | 2017-08 | 2017-07 | 2017-06 | 2017-05 | 2017-04 | 2017-03 | 2017-02 | 2017-01 | 2016-12 | 2016-11 | 2016-10 | 2016-09 | 2016-08 | 2016-07 | 2016-06 | 2016-04 | 2016-03 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| no2 | 35 (Good) | 42 (Moderate) | 85 (Moderate) | 84 (Moderate) | 57 (Moderate) | 49 (Moderate) | 38 (Good) | 44 (Moderate) | 47 (Moderate) | 36 (Good) | 38 (Good) | 55 (Moderate) | 117 (Unhealthy for Sensitive Groups) | 72 (Moderate) | 86 (Moderate) | 42 (Moderate) | 45 (Moderate) | 26 (Good) | 28 (Good) | 36 (Good) | 36 (Good) | 41 (Moderate) | 27 (Good) |
| co | 1 (Good) | 1 (Good) | 1 (Good) | 1 (Good) | 1 (Good) | 1 (Good) | 1 (Good) | 1 (Good) | 1 (Good) | 759 (Good) | 932 (Good) | 771 (Good) | 1 (Good) | 1 (Good) | 1 (Good) | 809 (Good) | 2 (Good) | 655 (Good) | 702 (Good) | 606 (Good) | 686 (Good) | 1 (Good) | 1 (Good) |
| pm10 | 151 (Very bad Hazardous) | 136 (Very Unhealthy) | 101 (Unhealthy) | 85 (Unhealthy) | 100 (Unhealthy) | 83 (Unhealthy) | 77 (Unhealthy for Sensitive Groups) | 98 (Unhealthy) | 82 (Unhealthy) | 66 (Unhealthy for Sensitive Groups) | 91 (Unhealthy) | 89 (Unhealthy) | 94 (Unhealthy) | 111 (Very Unhealthy) | 131 (Very Unhealthy) | 138 (Very Unhealthy) | 129 (Very Unhealthy) | 70 (Unhealthy for Sensitive Groups) | 62 (Unhealthy for Sensitive Groups) | 92 (Unhealthy) | 73 (Unhealthy for Sensitive Groups) | 212 (Very bad Hazardous) | 162 (Very bad Hazardous) |
| so2 | 5.1 (Good) | 6 (Good) | 6 (Good) | 7 (Good) | 7.2 (Good) | 7.2 (Good) | 7.2 (Good) | 7.9 (Good) | 7.3 (Good) | - (Good) | - (Good) | - (Good) | - (Good) | - (Good) | - (Good) | - (Good) | - (Good) | - (Good) | - (Good) | - (Good) | - (Good) | - (Good) | - (Good) |
City Railway Station - KSPCB
| index | 2018-02 | 2018-01 | 2017-12 | 2017-11 | 2017-10 | 2017-09 | 2017-08 | 2017-07 | 2017-06 | 2017-05 | 2017-04 | 2017-03 | 2017-02 | 2017-01 | 2016-12 | 2016-11 | 2016-10 | 2016-09 | 2016-08 | 2016-07 | 2016-06 | 2016-04 | 2016-03 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| pm10 | 151 | 136 | 101 | 85 | 100 | 83 | 77 | 98 | 82 | 66 | 91 | 89 | 94 | 111 | 131 | 138 | 129 | 70 | 62 | 92 | 73 | 212 | 162 |
| co | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 759 | 932 | 771 | 1 | 1 | 1 | 809 | 2 | 655 | 702 | 606 | 686 | 1 | 1 |
| no2 | 35 | 42 | 85 | 84 | 57 | 49 | 38 | 44 | 47 | 36 | 38 | 55 | 117 | 72 | 86 | 42 | 45 | 26 | 28 | 36 | 36 | 41 | 27 |
| so2 | 5.1 | 6 | 6 | 7 | 7.2 | 7.2 | 7.2 | 7.9 | 7.3 | - | - | - | - | - | - | - | - | - | - | - | - | - | - |