| smoggiest | 1.76 | 1 | 4924 | 9 | 29 |
| smoggiest cities in the us | 1.71 | 0.9 | 819 | 26 | 59 |
| smoggiest cities in the world | 1.16 | 0.8 | 1236 | 29 | 4 |
| smoggiest levels in delhi | 1.73 | 0.9 | 8120 | 25 | 21 |
| smoggiest places in india | 1.71 | 0.1 | 3182 | 25 | 26 |
| smoggiest time of the year | 0.59 | 0.6 | 7460 | 26 | 95 |
| smoggiest effects on health | 1.72 | 0.7 | 6644 | 27 | 60 |
| smoggiest months in beijing | 1.2 | 0.2 | 3908 | 27 | 69 |
| smoggiest countries in europe | 1.73 | 0.3 | 7024 | 29 | 14 |
| smoggiest days in los angeles | 1.06 | 0.7 | 4141 | 29 | 4 |
| smoggiest causes and consequences | 1.87 | 0.2 | 1039 | 33 | 49 |
| smoggiest solutions for air pollution | 1.41 | 0.8 | 5989 | 37 | 87 |
| smoggiest us city bank | 0.63 | 0.5 | 4850 | 22 | 69 |
