| Month |
| Monthly mean PM2.5 concentrations and standard deviations (μg·m−3) | ||
| Outdoor | No inversion outdoor | SBI outdoor | ||
| March | 19.1 ± 5.2 | 30.3 ± 3.0 | 39.4 ± 3.8 | |
| April | 15.8 ± 3.7 | 26.0 ± 2.5 | 39.4 ± 4.2 | |
| May | 11.3 ± 2.2 | 13.8 ± 1.3 | 22.5 ± 1.0 | |
| June | 23.9 ± 14.6 | 35.8 ± 8.4 | 46.4 ± 5.1 | |
| July | 55.3 ± 59.2 | 58.4 ± 13.2 | 100.4 ± 17.0 | |
| August | 5.4 ± 2.3 | -.- | -.- | |
| September | 14.8 ± 5.7 | 24.6 ± 5.8 | 27.8 ± 3.9 | |