Table 2.
Classification of AQI level from 2018 to 2019
| Site | AQI | Level 1(d) | Level 2(d) | Level 3(d) | Level 4(d) | Level 5(d) | Level 6(d) |
| I | 74.40 | 138(19.77%) | 450(64.47%) | 88(12.61%) | 14(2.01%) | 5(0.72%) | 3(0.43%) |
| H | 72.31 | 206(29.51%) | 377(54.01%) | 82(11.75%) | 20(2.87%) | 11(1.58%) | 2(0.24%) |
| G | 71.84 | 211(30.23%) | 369(52.87%) | 89(12.75%) | 19(2.72%) | 6(0.86%) | 4(0.57%) |
| F | 71.53 | 217(31.09%) | 368(52.72%) | 84(12.03%) | 20(2.87%) | 6(0.86%) | 3(0.43%) |
| E | 71.00 | 195(27.94%) | 395(56.59%) | 82(11.75%) | 19(2.72%) | 5(0.72%) | 0(0.29%) |
| D | 70.35 | 177(25.36%) | 437(62.61%) | 71(10.17%) | 8(1.15%) | 3(0.43%) | 2(0.29%) |
| C | 68.72 | 238(34.10%) | 358(51.29%) | 79(11.32%) | 14(2.01%) | 8(1.15%) | 1(0.14%) |
| B | 67.90 | 243(34.81%) | 363(52.01%) | 71(10.17%) | 12(1.72%) | 7(1.00%) | 2(0.29%) |
| A | 61.46 | 318(45.56%) | 308(44.13%) | 55(7.88%) | 12(1.72%) | 3(0.43%) | 2(0.29%) |