| index | 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| no2 | 36 (Good) | 40 (Moderate) | 38 (Good) | 34 (Good) | 31 (Good) | 35 (Good) | 39 (Good) | 40 (Good) | 46 (Moderate) | 41 (Moderate) | 42 (Moderate) | 186 (Unhealthy) | 69 (Moderate) | 31 (Good) |
| so2 | 12 (Good) | 15 (Good) | 15 (Good) | 19 (Good) | 20 (Good) | 34 (Good) | 9 (Good) | 6.9 (Good) | 20 (Good) | - (Good) | - (Good) | - (Good) | - (Good) | - (Good) |
| pm10 | 100 (Unhealthy) | 86 (Unhealthy) | 66 (Unhealthy for Sensitive Groups) | 72 (Unhealthy for Sensitive Groups) | 80 (Unhealthy) | 86 (Unhealthy) | 103 (Unhealthy) | 137 (Very Unhealthy) | 245 (Very bad Hazardous) | 260 (Very bad Hazardous) | 291 (Very bad Hazardous) | 229 (Very bad Hazardous) | 168 (Very bad Hazardous) | 49 (Moderate) |
| co | 583 (Good) | 573 (Good) | 578 (Good) | 527 (Good) | 513 (Good) | 556 (Good) | 597 (Good) | 704 (Good) | 1 (Good) | 1 (Good) | 1 (Good) | 1 (Good) | 1 (Good) | 712 (Good) |
| o3 | 40 (Good) | 14 (Good) | 12 (Good) | 13 (Good) | 23 (Good) | 24 (Good) | 20 (Good) | 22 (Good) | 25 (Good) | 16 (Good) | 14 (Good) | 33 (Good) | 73 (Moderate) | 26 (Good) |
Rabindra Bharati University, Kolkata - WBSPCB
| index | 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| no2 | 36 | 40 | 38 | 34 | 31 | 35 | 39 | 40 | 46 | 41 | 42 | 186 | 69 | 31 |
| co | 583 | 573 | 578 | 527 | 513 | 556 | 597 | 704 | 1 | 1 | 1 | 1 | 1 | 712 |
| o3 | 40 | 14 | 12 | 13 | 23 | 24 | 20 | 22 | 25 | 16 | 14 | 33 | 73 | 26 |
| pm10 | 100 | 86 | 66 | 72 | 80 | 86 | 103 | 137 | 245 | 260 | 291 | 229 | 168 | 49 |
| so2 | 12 | 15 | 15 | 19 | 20 | 34 | 9 | 6.9 | 20 | - | - | - | - | - |