| Index | [PM2.5] | ||
| Annual mean (μg·m−3) | Cold season mean (μg·m−3) | Warm season mean | |
| PDO positive | 10.5 | 18.2 | 7.1 |
| PDO negative | 14.6 | 16.4 | 15.1 |
| SOI positive | 11.2 | 17.4 | 5.3 |
| SOI negative | 14.8 | 17.1 | 14.5 |
| NP < a, cs, ws | 17.0 | 17.3 | 16.3 |
| NP > a, cs, ws | 11.5 | 17.1 | 5.1 |